Cobalt–based catalysts are regarded as the most innovative catalyst in the urea oxidation reaction (UOR). Nevertheless, the activity limitation of Co–based catalysts by the unavoidable self–oxidation reaction of Co species (CSOR) during UOR is generally ignored. Therefore, the interface strategy was used to synthesize a CoSe hollow cube (HC)/CoSe nanosheet (NS) homogeneous interface catalyst to achieve bifunctional UOR and HER performance. In situ EIS, ex situ Raman spectroscopy, and ex situ XPS analysis verify the unique mechanism of the CoSe HC/CoSe NS interface in triggering UOR. Electrochemical activity tests demonstrated that CoSe HC/CoSe NS requires only 1.27 and 1.32 V of cell voltage to reach 10 mA cm in the overall urea electrolyzer (UOR || HER) and overall human urine electrolyzer (HUOR || HER) regimes, respectively. Moreover, under an industrial–grade current (500 mA cm), the cell voltage can be maintained at ＜2 V for 110 h. Ultraviolet (UV) spectroscopy confirms the potential of CoSe HC/CoSe NS to degrade urea wastewater. Software simulations reveal the advantages of the unique interface strategy of CoSe HC/CoSe NS in the UOR process.

中文翻译：

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CoSe2 空心立方体/CoSe2 纳米片界面催化剂用于在工业级电流下高效电解尿素辅助制氢

钴基催化剂被认为是尿素氧化反应（UOR）中最具创新性的催化剂。然而，UOR过程中不可避免的Co物种自氧化反应（CSOR）对钴基催化剂的活性限制通常被忽略。因此，采用界面策略合成CoSe空心立方体（HC）/CoSe纳米片（NS）均相界面催化剂，以实现双功能UOR和HER性能。原位 EIS、异位拉曼光谱和异位 XPS 分析验证了 CoSe HC/CoSe NS 界面触发 UOR 的独特机制。电化学活性测试表明，CoSe HC/CoSe NS 在整体尿素电解器 (UOR || HER) 和整体人尿液电解器 (HUOR || HER) 方案中分别仅需要 1.27 和 1.32 V 的电池电压即可达到 10 mA cm。此外，在工业级电流（500 mA cm）下，电池电压可维持<2 V 110小时。紫外 (UV) 光谱证实了 CoSe HC/CoSe NS 降解尿素废水的潜力。软件模拟揭示了 CoSe HC/CoSe NS 独特界面策略在 UOR 过程中的优势。