Vadivel Neshanth, Murthy Arun Prasad
Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India.
Small. 2024 Dec;20(52):e2407845. doi: 10.1002/smll.202407845. Epub 2024 Oct 21.
Water electrolysis using renewable energy is considered as a promising technique for sustainable and green hydrogen production. Conventional water electrolysis has two components - hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) occurring at the cathode and anode respectively. However, electrolysis of water suffers from high overpotential due to the slow kinetics of OER. To overcome this hybrid water electrolysis has been developed by replacing conventional anode oxidation producing oxygen with oxidation of cost-effective materials producing value-added chemicals. This review summarizes recent advances in organic oxidative reactions such as alcohols, urea, hydrazine, and biomass at the anode instead of OER. Furthermore, the review also highlights the use of membrane-free hybrid water electrolysis as a method to overcome the cost and complexity associated with conventional membrane-based electrolyzer thereby improving overall efficiency. This approach holds promise for scalable and cost-effective large-scale hydrogen production along with value-added products. Finally, current challenges and future perspectives are discussed for further development in membrane-free hybrid water electrolysis.
利用可再生能源进行水电解被认为是一种有前景的可持续绿色制氢技术。传统水电解有两个组成部分——分别在阴极发生的析氢反应（HER）和在阳极发生的析氧反应（OER）。然而，由于析氧反应动力学缓慢，水电解存在高过电位问题。为克服这一问题，已开发出混合水电解，用生产增值化学品的低成本材料氧化替代产生氧气的传统阳极氧化。本综述总结了阳极上醇类、尿素、肼和生物质等有机氧化反应而非析氧反应的最新进展。此外，该综述还强调了无膜混合水电解作为一种克服与传统基于膜的电解槽相关的成本和复杂性从而提高整体效率的方法的应用。这种方法有望实现可扩展且具有成本效益的大规模制氢以及生产增值产品。最后，讨论了无膜混合水电解进一步发展面临的当前挑战和未来前景。
