Water splitting, the process of converting water into hydrogen and oxygen gases, has garnered significant attention as a promising avenue for sustainable energy production. One area of focus has been the development of efficient and cost-effective catalysts for water splitting. Researchers have explored catalysts based on abundant and inexpensive materials such as nickel, iron, and cobalt, which have demonstrated improved performance and stability. These catalysts show promise for large-scale implementation and offer potential for reducing the reliance on expensive and scarce materials. Another avenue of research involves photoelectrochemical (PEC) cells, which utilize solar energy to drive the water-splitting reaction. Scientists have been working on designing novel materials, including metal oxides and semiconductors, to enhance light absorption and charge separation properties. These advancements in PEC technology aim to maximize the conversion of sunlight into chemical energy. Inspired by natural photosynthesis, artificial photosynthesis approaches have also gained traction. By integrating light-absorbing materials, catalysts, and membranes, these systems aim to mimic the complex processes of natural photosynthesis and produce hydrogen fuel from water. The development of efficient and stable artificial photosynthesis systems holds promise for sustainable and clean energy production. Tandem cells, which combine multiple light-absorbing materials with different bandgaps, have emerged as a strategy to enhance the efficiency of water-splitting systems. By capturing a broader range of the solar spectrum, tandem cells optimize light absorption and improve overall system performance. Lastly, advancements in electrocatalysis have played a critical role in water splitting. Researchers have focused on developing advanced electrocatalysts with high activity, selectivity, and stability for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). These electrocatalysts contribute to overall water-splitting efficiency and pave the way for practical implementation.

1. Hota P, Das A, Maiti DK. A short review on generation of green fuel hydrogen through water splitting. International Journal of Hydrogen Energy. 2023; 48(2): 523-541. doi: 10.1016/j.ijhydene.2022.09.264

2. Mohsin M, Ishaq T, Bhatti IA, et al. Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel. Nanomaterials. 2023; 13(3): 546. doi: 10.3390/nano13030546

3. Gong Y, Yao J, Wang P, et al. Perspective of hydrogen energy and recent progress in electrocatalytic water splitting. Chinese Journal of Chemical Engineering. 2022; 43: 282-296. doi: 10.1016/j.cjche.2022.02.010

4. Rafique M, Mubashar R, Irshad M, et al. A Comprehensive Study on Methods and Materials for Photocatalytic Water Splitting and Hydrogen Production as a Renewable Energy Resource. Journal of Inorganic and Organometallic Polymers and Materials. 2020; 30(10): 3837-3861. doi: 10.1007/s10904-020-01611-9

5. Li Y, Sun Y, Qin Y, et al. Recent Advances on Water‐Splitting Electrocatalysis Mediated by Noble‐Metal‐Based Nanostructured Materials. Advanced Energy Materials. 2020; 10(11). doi: 10.1002/aenm.201903120

6. Wang YZ, Yang M, Ding Y, et al. Recent Advances in Complex Hollow Electrocatalysts for Water Splitting. Advanced Functional Materials. 2021; 32(6). doi: 10.1002/adfm.202108681

7. Shamsah SMI. Earth-Abundant Electrocatalysts for Water Splitting: Current and Future Directions. Catalysts. 2021; 11(4): 429. doi: 10.3390/catal11040429

8. Hayat A, Sohail M, Ali H, et al. Recent Advances and Future Perspectives of Metal‐Based Electrocatalysts for Overall Electrochemical Water Splitting. The Chemical Record. 2022; 23(2). doi: 10.1002/tcr.202200149

9. Li S, Li E, An X, et al. Transition metal-based catalysts for electrochemical water splitting at high current density: current status and perspectives. Nanoscale. 2021; 13(30): 12788-12817. doi: 10.1039/d1nr02592a

10. Hamdani IR, Bhaskarwar AN. Recent progress in material selection and device designs for photoelectrochemical water-splitting. Renewable and Sustainable Energy Reviews. 2021; 138: 110503. doi: 10.1016/j.rser.2020.110503

11. Sivagurunathan AT, Adhikari S, Kim DH. Strategies and implications of atomic layer deposition in photoelectrochemical water splitting: Recent advances and prospects. Nano Energy. 2021; 83: 105802. doi: 10.1016/j.nanoen.2021.105802

12. Ali M, Pervaiz E, Noor T, et al. Recent advancements in MOF‐ based catalysts for applications in electrochemical and photoelectrochemical water splitting: A review. International Journal of Energy Research. 2020; 45(2): 1190-1226. doi: 10.1002/er.5807

13. Pratibha, Kapoor A, Rajput JK. Nanostructured materials for the visible-light driven hydrogen evolution by water splitting: A review. International Journal of Hydrogen Energy. 2022; 47(40): 17544-17582. doi: 10.1016/j.ijhydene.2022.03.232

14. Wang Y, Zhang J, Liang W, et al. Plasmonic Metal Nanostructures as Efficient Light Absorbers for Solar Water Splitting. Advanced Energy and Sustainability Research. 2021; 2(11). doi: 10.1002/aesr.202100092

15. Samanta B, Morales-García Á, Illas F, et al. Challenges of modeling nanostructured materials for photocatalytic water splitting. Chemical Society Reviews. 2022; 51(9): 3794-3818. doi: 10.1039/d1cs00648g

16. Mohamed HH. Green processes and sustainable materials for renewable energy production via water splitting. Sustainable Materials and Green Processing for Energy Conversion. Published online 2022: 169-212. doi: 10.1016/b978-0-12-822838-8.00007-7

17. Hosseini SE, Wahid MA. Hydrogen from solar energy, a clean energy carrier from a sustainable source of energy. International Journal of Energy Research. 2020; 44(6): 4110-4131. doi: 10.1002/er.4930

18. Ashraf M, Ayaz M, Khan M, et al. Recent Trends in Sustainable Solar Energy Conversion Technologies: Mechanisms, Prospects, and Challenges. Energy & Fuels. 2023; 37(9): 6283-6301. doi: 10.1021/acs.energyfuels.2c04077

19. Han N, Race M, Zhang W, et al. Perovskite and related oxide based electrodes for water splitting. Journal of Cleaner Production. 2021; 318: 128544. doi: 10.1016/j.jclepro.2021.128544

20. Wang Y, Seo B, Wang B, et al. Fundamentals, materials, and machine learning of polymer electrolyte membrane fuel cell technology. Energy and AI. 2020; 1: 100014. doi: 10.1016/j.egyai.2020.100014

21. Kawawaki T, Kawachi M, Yazaki D, et al. Development and Functionalization of Visible-Light-Driven Water-Splitting Photocatalysts. Nanomaterials. 2022; 12(3): 344. doi: 10.3390/nano12030344

22. Vilanova A, Dias P, Lopes T, et al. The route for commercial photoelectrochemical water splitting: a review of large-area devices and key upscaling challenges. Chemical Society Reviews. 2024; 53(5): 2388-2434. doi: 10.1039/d1cs01069g

23. Jolaoso LA, Duan C, Kazempoor P. Life cycle analysis of a hydrogen production system based on solid oxide electrolysis cells integrated with different energy and wastewater sources. International Journal of Hydrogen Energy. 2024; 52: 485-501. doi: 10.1016/j.ijhydene.2023.07.129

24. Qahtan TF, Alade IO, Rahaman MS, et al. Mapping the research landscape of hydrogen production through electrocatalysis: A decade of progress and key trends. Renewable and Sustainable Energy Reviews. 2023; 184: 113490. doi: 10.1016/j.rser.2023.113490

25. Salonen LM, Petrovykh DY, Kolen’ko YuV. Sustainable catalysts for water electrolysis: Selected strategies for reduction and replacement of platinum-group metals. Materials Today Sustainability. 2021; 11-12: 100060. doi: 10.1016/j.mtsust.2021.100060

26. Hughes AE, Haque N, Northey SA, et al. Platinum Group Metals: A Review of Resources, Production and Usage with a Focus on Catalysts. Resources. 2021; 10(9): 93. doi: 10.3390/resources10090093

27. Liu J, Li Y, Zhou X, et al. Positively charged Pt-based cocatalysts: an orientation for achieving efficient photocatalytic water splitting. Journal of Materials Chemistry A. 2020; 8(1): 17-26. doi: 10.1039/c9ta10568a

28. Karuppasamy L, Gurusamy L, Ananan S, et al. Metal-organic frameworks derived interfacing Fe2O3/ZnCo2O4 multimetal oxides as a bifunctional electrocatalyst for overall water splitting. Electrochimica Acta. 2023; 449: 142242. doi: 10.1016/j.electacta.2022.142242

29. Warsi MF, Shaheen N, Sarwar MI, et al. A comparative study on photocatalytic activities of various transition metal oxides nanoparticles synthesized by wet chemical route. Desalination And Water Treatment. 2021; 211: 181-195. doi: 10.5004/dwt.2021.26463

30. Cao Q, Li Q, Pi Z, et al. Metal–Organic-Framework-Derived Ball-Flower-like Porous Co3O4/Fe2O3 Heterostructure with Enhanced Visible-Light-Driven Photocatalytic Activity. Nanomaterials. 2022; 12(6): 904. doi: 10.3390/nano12060904

31. Jeghan SMN, Kim D, Lee Y, et al. Designing a smart heterojunction coupling of cobalt-iron layered double hydroxide on nickel selenide nanosheets for highly efficient overall water splitting kinetics. Applied Catalysis B: Environmental. 2022; 308: 121221. doi: 10.1016/j.apcatb.2022.121221

32. Yu M, Budiyanto E, Tüysüz H. Principles of Water Electrolysis and Recent Progress in Cobalt‐, Nickel‐, and Iron‐Based Oxides for the Oxygen Evolution Reaction. Angewandte Chemie International Edition. 2021; 61(1). doi: 10.1002/anie.202103824

33. Yaseen W, Ullah N, Xie M, et al. Ni-Fe-Co based mixed metal/metal-oxides nanoparticles encapsulated in ultrathin carbon nanosheets: A bifunctional electrocatalyst for overall water splitting. Surfaces and Interfaces. 2021; 26: 101361. doi: 10.1016/j.surfin.2021.101361

34. Zhang B, Zheng Y, Ma T, et al. Designing MOF Nanoarchitectures for Electrochemical Water Splitting. Advanced Materials. 2021; 33(17). doi: 10.1002/adma.202006042

35. Yao D, Gu L, Zuo B, et al. A strategy for preparing high-efficiency and economical catalytic electrodes toward overall water splitting. Nanoscale. 2021; 13(24): 10624-10648. doi: 10.1039/d1nr02307a

36. Li Z, Hu M, Wang P, et al. Heterojunction catalyst in electrocatalytic water splitting. Coordination Chemistry Reviews. 2021; 439: 213953. doi: 10.1016/j.ccr.2021.213953

37. Huang J, Jiang Y, An T, et al. Increasing the active sites and intrinsic activity of transition metal chalcogenide electrocatalysts for enhanced water splitting. Journal of Materials Chemistry A. 2020; 8(48): 25465-25498. doi: 10.1039/d0ta08802a

38. Huang H, Cho A, Kim S, et al. Structural Design of Amorphous CoMoPx with Abundant Active Sites and Synergistic Catalysis Effect for Effective Water Splitting. Advanced Functional Materials. 2020; 30(43). doi: 10.1002/adfm.202003889

39. Raheema MH, Jaber GS. Synthesis of Carbon Nanotubes Using Modified Hummers Method for Cathode Electrodes in Dye-Sensitized Solar Cell. Baghdad Science Journal. Published online April 20, 2023. doi: 10.21123/bsj.2023.7150

40. Shahazi R, Majumdar S, Saddam AI, et al. Carbon nanomaterials for biomedical applications: A comprehensive review. Nano Carbons. 2023; 1(1): 448. doi: 10.59400/n-c.v1i1.448

41. Chen Y, Zheng W, Murcia-López S, et al. Light management in photoelectrochemical water splitting – from materials to device engineering. Journal of Materials Chemistry C. 2021; 9(11): 3726-3748. doi: 10.1039/d0tc06071b

42. Moon C, Shin B. Review on light absorbing materials for unassisted photoelectrochemical water splitting and systematic classifications of device architectures. Discover Materials. 2022; 2(1). doi: 10.1007/s43939-022-00026-2

43. Kawase Y, Higashi T, Domen K, et al. Recent Developments in Visible‐Light‐Absorbing Semitransparent Photoanodes for Tandem Cells Driving Solar Water Splitting. Advanced Energy and Sustainability Research. 2021; 2(7). doi: 10.1002/aesr.202100023

44. Liu HY, Cody CC, Jayworth JA, et al. Surface-Attached Molecular Catalysts on Visible-Light-Absorbing Semiconductors: Opportunities and Challenges for a Stable Hybrid Water-Splitting Photoanode. ACS Energy Letters. 2020; 5(10): 3195-3202. doi: 10.1021/acsenergylett.0c01719

45. Yang G, Yu S, Kang Z, et al. Building Electron/Proton Nanohighways for Full Utilization of Water Splitting Catalysts. Advanced Energy Materials. 2020; 10(16). doi: 10.1002/aenm.201903871

46. Liu PF, Yin H, Fu HQ, et al. Activation strategies of water-splitting electrocatalysts. Journal of Materials Chemistry A. 2020; 8(20): 10096-10129. doi: 10.1039/d0ta01680b

47. Zeng C, Dai L, Jin Y, et al. Design strategies toward transition metal selenide-based catalysts for electrochemical water splitting. Sustainable Energy & Fuels. 2021; 5(5): 1347-1365. doi: 10.1039/d0se01722a

48. Gahlot S, Kulshrestha V. Graphene based polymer electrolyte membranes for electro-chemical energy applications. International Journal of Hydrogen Energy. 2020; 45(34): 17029-17056. doi: 10.1016/j.ijhydene.2019.06.047

49. Li C, Baek JB. The promise of hydrogen production from alkaline anion exchange membrane electrolyzers. Nano Energy. 2021; 87: 106162. doi: 10.1016/j.nanoen.2021.106162

50. Du N, Roy C, Peach R, et al. Anion-Exchange Membrane Water Electrolyzers. Chemical Reviews. 2022; 122(13): 11830-11895. doi: 10.1021/acs.chemrev.1c00854

51. Tiwari JN, Singh AN, Sultan S, et al. Recent Advancement of p‐ and d‐Block Elements, Single Atoms, and Graphene‐Based Photoelectrochemical Electrodes for Water Splitting. Advanced Energy Materials. 2020; 10(24). doi: 10.1002/aenm.202000280

52. Li B, Tian Z, Li L, et al. Directional Charge Transfer Channels in a Monolithically Integrated Electrode for Photoassisted Overall Water Splitting. ACS Nano. 2023; 17(4): 3465-3482. doi: 10.1021/acsnano.2c09659

53. Ng WC, Chong MN. Organic-inorganic p-type PEDOT: PSS/CuO/MoS2 photocathode with in-built antipodal photogenerated holes and electrons transfer pathways for efficient solar-driven photoelectrochemical water splitting. Sustainable Materials and Technologies. 2023; 38: e00749. doi: 10.1016/j.susmat.2023.e00749

54. Ašmontas S, Mujahid M. Recent Progress in Perovskite Tandem Solar Cells. Nanomaterials. 2023; 13(12): 1886. doi: 10.3390/nano13121886

55. Martinho F. Challenges for the future of tandem photovoltaics on the path to terawatt levels: a technology review. Energy & Environmental Science. 2021; 14(7): 3840-3871. doi: 10.1039/d1ee00540e

56. Kumar P, Thokala S, Singh SP, et al. Research progress and challenges in extending the infra-red absorption of perovskite tandem solar cells. Nano Energy. 2024; 121: 109175. doi: 10.1016/j.nanoen.2023.109175

57. He R, Ren S, Chen C, et al. Wide-bandgap organic–inorganic hybrid and all-inorganic perovskite solar cells and their application in all-perovskite tandem solar cells. Energy & Environmental Science. 2021; 14(11): 5723-5759. doi: 10.1039/d1ee01562a

58. Ullah F, Chen CC, Choy WCH. Recent Developments in Organic Tandem Solar Cells toward High Efficiency. Advanced Energy and Sustainability Research. 2021; 2(4). doi: 10.1002/aesr.202000050

59. Wang Y, Shi H, Cui K, et al. Reversible electron storage in tandem photoelectrochemical cell for light driven unassisted overall water splitting. Applied Catalysis B: Environmental. 2020; 275: 119094. doi: 10.1016/j.apcatb.2020.119094

60. Zhang D, Cho H, Yum J, et al. An Organic Semiconductor Photoelectrochemical Tandem Cell for Solar Water Splitting. Advanced Energy Materials. 2022; 12(42). doi: 10.1002/aenm.202202363

61. Zhou B, Gao R, Zou J, et al. Surface Design Strategy of Catalysts for Water Electrolysis. Small. 2022; 18(27). doi: 10.1002/smll.202202336

62. Li J, Liu Y, Chen H, et al. Design of a Multilayered Oxygen‐Evolution Electrode with High Catalytic Activity and Corrosion Resistance for Saline Water Splitting. Advanced Functional Materials. 2021; 31(27). doi: 10.1002/adfm.202101820

63. Almomani F, Shawaqfah M, Alkasrawi M. Solar-driven hydrogen production from a water-splitting cycle based on carbon-TiO2 nano-tubes. International Journal of Hydrogen Energy. 2022; 47(5): 3294-3305. doi: 10.1016/j.ijhydene.2020.12.19

64. Lee JU, Kim JH, Kang K, et al. Bulk and surface modified polycrystalline CuWO4 films for photoelectrochemical water oxidation. Renewable Energy. 2023; 203: 779-787. doi: 10.1016/j.renene.2022.12.129

65. Joseph M, Kumar M, Haridas S, et al. A review on the advancements of graphitic carbon nitride-based photoelectrodes for photoelectrochemical water splitting. Energy Advances. 2024; 3(1): 30-59. doi: 10.1039/d3ya00506b

66. Singh B, Indra A. Surface and interface engineering in transition metal–based catalysts for electrochemical water oxidation. Materials Today Chemistry. 2020; 16: 100239. doi: 10.1016/j.mtchem.2019.100239

67. Gu H, Shi G, Chen HC, et al. Strong Catalyst–Support Interactions in Electrochemical Oxygen Evolution on Ni–Fe Layered Double Hydroxide. ACS Energy Letters. 2020; 5(10): 3185-3194. doi: 10.1021/acsenergylett.0c01584

68. Yang X, Guo R, Cai R, et al. Engineering transition metal catalysts for large-current-density water splitting. Dalton Transactions. 2022; 51(12): 4590-4607. doi: 10.1039/d2dt00037g

69. Zhou X, Wang P, Li M, et al. Synergistic effect of phosphorus doping and MoS2 co-catalysts on g-C3N4 photocatalysts for enhanced solar water splitting. Journal of Materials Science & Technology. 2023; 158: 171-179. doi: 10.1016/j.jmst.2023.02.041

70. Xiao N, Li S, Li X, et al. The roles and mechanism of cocatalysts in photocatalytic water splitting to produce hydrogen. Chinese Journal of Catalysis. 2020; 41(4): 642-671. doi: 10.1016/S1872-2067(19)63469-8

71. Luo Y, Zhang Z, Chhowalla M, et al. Recent Advances in Design of Electrocatalysts for High‐Current‐Density Water Splitting. Advanced Materials. 2022; 34(16). doi: 10.1002/adma.202108133

72. Sun H, Xu X, Kim H, et al. Electrochemical Water Splitting: Bridging the Gaps Between Fundamental Research and Industrial Applications. Energy & Environmental Materials. 2023; 6(5): 12441. doi: 10.1002/eem2.12441

73. Luo F, Guo L, Xie Y, et al. Iridium nanorods as a robust and stable bifunctional electrocatalyst for pH-universal water splitting. Applied Catalysis B: Environmental. 2020; 279: 119394. doi: 10.1016/j.apcatb.2020.119394

74. Luo F, Hu H, Zhao X, et al. Robust and Stable Acidic Overall Water Splitting on Ir Single Atoms. Nano Letters. 2020; 20(3): 2120-2128. doi: 10.1021/acs.nanolett.0c00127

75. Qin R, Chen G, Feng X, et al. Ru/Ir‐Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges. Advanced Science. Published online March 19, 2024. doi: 10.1002/advs.202309364

76. Pascuzzi MEC, Goryachev A, Hofmann JP, et al. Mn promotion of rutile TiO2-RuO2 anodes for water oxidation in acidic media. Applied Catalysis B: Environmental. 2020; 261: 118225. doi: 10.1016/j.apcatb.2019.118225

77. Zhang Y, Yan R, Xu X, et al. Next Generation Noble Metal‐Engineered Catalysts: From Structure Evolution to Structure‐Reactivity Correlation in Water Splitting. Advanced Functional Materials. 2023; 34(4). doi: 10.1002/adfm.202308813

78. Bao J, Xie J, Lei F, et al. Two-Dimensional Mn-Co LDH/Graphene Composite towards High-Performance Water Splitting. Catalysts. 2018; 8(9): 350. doi: 10.3390/catal8090350

79. Patial S, Hasija V, Raizada P, et al. Tunable photocatalytic activity of SrTiO3 for water splitting: Strategies and future scenario. Journal of Environmental Chemical Engineering. 2020; 8(3): 103791. doi: 10.1016/j.jece.2020.103791

80. Yu J, Wu X, Guan D, et al. Monoclinic SrIrO3: An Easily Synthesized Conductive Perovskite Oxide with Outstanding Performance for Overall Water Splitting in Alkaline Solution. Chemistry of Materials. 2020; 32(11): 4509-4517. doi: 10.1021/acs.chemmater.0c00149

81. Zhang L, Jang H, Li Z, et al. SrIrO3 modified with laminar Sr2IrO4 as a robust bifunctional electrocatalyst for overall water splitting in acidic media. Chemical Engineering Journal. 2021; 419: 129604. doi: 10.1016/j.cej.2021.129604

82. Aegerter D, Borlaf M, Fabbri E, et al. Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity. Catalysts. 2020; 10(9): 984. doi: 10.3390/catal10090984

83. Peng X, Jin X, Gao B, et al. Strategies to improve cobalt-based electrocatalysts for electrochemical water splitting. Journal of Catalysis. 2021; 398: 54-66. doi: 10.1016/j.jcat.2021.04.003

84. Lei L, Huang D, Zhou C, et al. Demystifying the active roles of NiFe-based oxides/(oxy)hydroxides for electrochemical water splitting under alkaline conditions. Coordination Chemistry Reviews. 2020; 408: 213177. doi: 10.1016/j.ccr.2019.213177

85. Bodhankar PM, Sarawade PB, Kumar P, et al. Nanostructured Metal Phosphide Based Catalysts for Electrochemical Water Splitting: A Review. Small. 2022; 18(21). doi: 10.1002/smll.202107572

86. Feng Y, Zhu L, Pei A, et al. Platinum–palladium-on-reduced graphene oxide as bifunctional electrocatalysts for highly active and stable hydrogen evolution and methanol oxidation reaction. Nanoscale. 2023; 15(42): 16904-16913. doi: 10.1039/d3nr04014c

87. Jebaslinhepzybai BT, Prabu N, Sasidharan M. Facile galvanic replacement method for porous Pd@Pt nanoparticles as an efficient HER electrocatalyst. International Journal of Hydrogen Energy. 2020; 45(19): 11127-11137. doi: 10.1016/j.ijhydene.2020.02.059

88. Lyu Z, Zhang X, Liao X, et al. Two-Dimensionally Assembled Pd–Pt–Ir Supernanosheets with Subnanometer Interlayer Spacings toward High-Efficiency and Durable Water Splitting. ACS Catalysis. 2022; 12(9): 5305-5315. doi: 10.1021/acscatal.2c00859

89. Roger I, Shipman MA, Symes MD. Earth-abundant catalysts for electrochemical and photoelectrochemical water splitting. Nature Reviews Chemistry. 2017; 1(1). doi: 10.1038/s41570-016-0003

90. Lobinsky AA, Tolstoy VP, Kodinzev IA. Electrocatalytic properties of γ-NiOOH nanolayers, synthesized by successive ionic layer deposition, during the oxygen evolution reaction upon water splitting in the alkaline medium. Nanosystems: Physics, Chemistry, Mathematics. Published online October 31, 2018: 669-675. doi: 10.17586/2220-8054-2018-9-5-669-675

91. Shinagawa T, Garcia-Esparza AT, Takanabe K. Insight on Tafel slopes from a microkinetic analysis of aqueous electrocatalysis for energy conversion. Scientific Reports. 2015; 5(1). doi: 10.1038/srep13801

92. Antipin D, Risch M. Calculation of the Tafel slope and reaction order of the oxygen evolution reaction between pH 12 and pH 14 for the adsorbate mechanism. Electrochemical Science Advances. 2022; 3(6). doi: 10.1002/elsa.202100213

93. Lin L, Lin Z, Zhang J, et al. Molecular-level insights on the reactive facet of carbon nitride single crystals photocatalysing overall water splitting. Nature Catalysis. 2020; 3(8): 649-655. doi: 10.1038/s41929-020-0476-3

94. Liu W, Zhang H, Li C, et al. Non-noble metal single-atom catalysts prepared by wet chemical method and their applications in electrochemical water splitting. Journal of Energy Chemistry. 2020; 47: 333-345. doi: 10.1016/j.jechem.2020.02.020