Integrating water electrolysis and green electricity offers a promising approach towards sustainable and clean energy. However, such a system demands electrodes that can swiftly and stably adapt to a fluctuating power supply. Here, we developed a monolithic Co–FeCo₈S₈ electrode to realize robust water electrolysis under steady and fluctuated electricity owing to its strong interfacial bonding and unimpeded charge transfer between substrates and catalysts. The activated Co–FeCo₈S₈ electrode displays excellent oxygen evolution reaction performance with a small overpotential of 334 mV at 2000 mA cm⁻² and operates stably for 1500 h at 500 mA cm⁻². The assembled anion exchange membrane water electrolyzer needs a small cell voltage of 1.79 V at 1.0 A cm⁻² and operates stably with a low voltage degradation rate of 0.115 mV h⁻¹, surpassing most reported electrolyzers. Notably, the electrolyzer shows rapid response and stable operation when coupled with fluctuating solar electricity. This work provides guidance for designing stable electrodes for practical applications with a fluctuating power supply.

中文翻译：

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用于由波动电源驱动的稳定阴离子交换膜水电解槽的单片 Co-FeCo8S8 电极


将电解水和绿色电力相结合为实现可持续和清洁能源提供了一种很有前途的方法。然而，这样的系统需要能够快速、稳定地适应波动电源的电极。在这里，我们开发了一种整体式 Co-FeCo₈S₈ 电极，由于其强大的界面键合和衬底和催化剂之间的电荷转移畅通无阻，可以在稳定和波动的电流下实现稳健的水电解。活化的 Co-FeCo₈S₈ 电极表现出优异的析氧反应性能，在 2000 mA ^cm-2 时具有 334 mV 的小过电位，并在 500 mA ^cm-2 下稳定运行 1500 小时。组装的阴离子交换膜水电解槽在 1.0 A ^cm-2 时需要 1.79 V 的小电池电压，并以 0.115 mV ^h-1 的低电压衰减率稳定运行，超过了大多数已报道的电解槽。值得注意的是，电解槽在与波动的太阳能电力相结合时表现出快速响应和稳定运行。这项工作为为电源波动的实际应用设计稳定的电极提供了指导。