Electrolysis systems constructed by anodic urea oxidation reaction (UOR) and cathodic hydrogen evolution reaction (HER) have received considerable attention in sustainable energy and waste utilization. However, current electrolysis systems are far from the requirement of practical applications due to the limited catalytic activity and stability of the electrodes. Herein, we design a UOR electrode with Co-doped NiMoO₄ treated in Ar (NCMO–Ar), which shows superior UOR performance because of the Co doping. On the other hand, the Co-doped NiMoO₄ treated in H₂ (NCMO–H₂) delivers high activity for HER. Moreover, the use of a flow electrolysis cell is demonstrated with continuous injection of urea, which only requires a low operation potential of 1.342 V to reach 10 mA cm⁻², and shows no attenuation at a large operation current of 100 mA cm⁻² for 200 h. It is believed that this high-performance electrolysis system lays an important foundation in developing a practical electrolyzer for efficient and sustainable hydrogen production coupled with waste organic oxidation.

中文翻译：

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共掺杂 Ni-Mo 氧化物：用于尿素电氧化辅助制氢的高效且坚固的电催化剂

由阳极尿素氧化反应（UOR）和阴极析氢反应（HER）构建的电解系统在可持续能源和废物利用方面受到了广泛关注。然而，由于电极的催化活性和稳定性有限，目前的电解系统远不能满足实际应用的要求。在此，我们设计了一种在 Ar (NCMO-Ar) 中处理Co 掺杂的 NiMoO ₄的 UOR 电极，该电极由于 Co 掺杂而显示出优异的 UOR 性能。另一方面，在 H ₂中处理的共掺杂 NiMoO ₄ (NCMO-H ₂) 为 HER 提供高活性。此外，通过连续注入尿素证明了流式电解槽的使用，仅需1.342 V的低工作电位即可达到10 mA cm ^{-2 ，并且在100 mA cm -2}的大工作电流下没有衰减。200 小时。相信这种高性能电解系统为开发实用的电解槽奠定了重要基础，该电解槽可实现高效和可持续的氢气生产以及废有机物氧化。