Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
Nat Commun. 2016 May 20;7:11741. doi: 10.1038/ncomms11741.
Low-cost alkaline water electrolysis has been considered a sustainable approach to producing hydrogen using renewable energy inputs, but preventing hydrogen/oxygen mixing and efficiently using the instable renewable energy are challenging. Here, using nickel hydroxide as a redox mediator, we decouple the hydrogen and oxygen production in alkaline water electrolysis, which overcomes the gas-mixing issue and may increase the use of renewable energy. In this architecture, the hydrogen production occurs at the cathode by water reduction, and the anodic Ni(OH)2 is simultaneously oxidized into NiOOH. The subsequent oxygen production involves a cathodic NiOOH reduction (NiOOH→Ni(OH)2) and an anodic OH(-) oxidization. Alternatively, the NiOOH formed during hydrogen production can be coupled with a zinc anode to form a NiOOH-Zn battery, and its discharge product (that is, Ni(OH)2) can be used to produce hydrogen again. This architecture brings a potential solution to facilitate renewables-to-hydrogen conversion.
低成本碱性水电解被认为是利用可再生能源输入生产氢气的一种可持续方法，但防止氢气/氧气混合和有效利用不稳定的可再生能源是具有挑战性的。在这里，我们使用氢氧化镍作为氧化还原介体，将碱性水电解中的氢气和氧气生产解耦，从而克服了气体混合问题，并可能增加可再生能源的利用。在这种结构中，氢气在阴极通过水还原产生，而阳极的 Ni(OH)2 同时被氧化成 NiOOH。随后的氧气生产涉及阴极 NiOOH 的还原（NiOOH→Ni(OH)2）和阳极 OH-的氧化。或者，在氢气生产过程中形成的 NiOOH 可以与锌阳极结合形成 NiOOH-Zn 电池，其放电产物（即 Ni(OH)2）可再次用于生产氢气。这种结构为促进可再生能源向氢气的转化带来了一种潜在的解决方案。
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