Water electrolysis powered by renewable energy is a green and sustainable method for hydrogen production. Decoupled water electrolysis with the aid of solid‐state redox mediator could separate the hydrogen and oxygen production in time and space without the use of the membrane, showing high flexibility. Herein, a MoO3 electrode with fast proton transport property is employed as a solid‐state redox mediator to construct a membrane‐free decoupled acidic electrolytic system. The MoO3 electrode exhibits high specific capacity (204.3 mAh g−1 at 5 A g−1) and excellent rate performance (92.8 mAh g−1 at 150 A g−1) in the acidic environment. Due to the dense oxide‐ion arrays, MoO3 still exhibits excellent performance under high mass‐loading. In addition, a hybrid decoupled electrolysis system is also constructed by combining water reduction and hydrazine oxidation, which can not only generate high‐purity H2 but also remove hydrazine hazards in acidic wastewater with lower energy consumption.

中文翻译：

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通过快速质子传递 MoO3 氧化还原介质实现解耦水还原和肼氧化，用于制氢


由可再生能源驱动的水电解是一种绿色且可持续的制氢方法。借助固态氧化还原介质的解耦水电解可以在不使用膜的情况下在时间和空间上分离氢和氧的产生，表现出很高的柔韧性。在此，采用具有快速质子传输特性的 MoO3 电极作为固态氧化还原介质，构建无膜解耦酸性电解系统。MoO3 电极在酸性环境中表现出高比容量（5 A g-1 时为 204.3 mAh g-1）和出色的倍率性能（150 A g-1 时为 92.8 mAh g-1）。由于密集的氧化物离子阵列，MoO3 在高质量负载下仍然表现出优异的性能。此外，还通过水还原和肼氧化相结合构建了混合解耦电解系统，不仅可以产生高纯度的 H2，还可以以较低的能耗去除酸性废水中的肼危害。