The oxygen evolution reaction (OER) is crucial in water electrolysis and metal–air battery and demands a low cost, efficient, and durable electrocatalyst. An ideal OER catalyst should possess optimal bindings to oxygenated intermediates, neither too strong nor too weak; however, the-state-of-the-art earth-abundant 3d first-row transition-metal-based OER catalysts still operate at overpotentials significantly above the thermodynamic equilibrium. In this work, we report a facile room temperature synthesis to prepare homogeneously dispersed, amorphous 3d multi-transition-metal alloys with tunable bindings to oxygenated species. The NiFeMoB alloy with near-optimal oxygenated intermediates adsorption energy exhibits the lowest OER overpotential of only 220 mV (with 95% solution resistance correction) at 500 mA/cm² on nickel foam in an alkaline electrolyte, which shows no evidence of degradation at this current density following 40 h of continuous operation. By coupling an amorphous NiFeMoB oxygen-evolving anode with a crystalline NiB hydrogen-evolving cathode, we successfully demonstrate an alkaline water electrolysis cell that can be stably operated at a current density of 500 mA/cm² with input voltage (without solution resistance correction) only around 1.72 V in 1 M KOH at room temperature and 1.57 V in 6 M KOH at 80 °C.

中文翻译：

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非晶态多金属合金制氧催化剂

氧气析出反应（OER）在水电解和金属空气电池中至关重要，需要低成本，高效且耐用的电催化剂。理想的OER催化剂应与含氧中间体具有最佳结合，既不能太强也不能太弱。然而，最先进的地球上3d第一行过渡金属基OER催化剂仍在明显高于热力学平衡的超电势下运行。在这项工作中，我们报告了一种简便的室温合成方法，以制备均匀分散的无定形3d多过渡金属合金，该合金具有与氧化物种可调节的结合力。在500 mA / cm ²的条件下，具有近乎最佳的含氧中间体吸附能的NiFeMoB合金在220 mV（具有95％的溶液电阻校正）的情况下显示出最低的OER过电势在碱性电解液中的泡沫镍上观察到，在连续运行40小时后，在此电流密度下没有显示出降解的迹象。通过将无定形的NiFeMoB析氧阳极与结晶的NiB析氢阴极耦合，我们成功地证明了碱性水电解槽可以在输入电压下以500 mA / cm ²的电流密度稳定运行（无需溶液电阻校正）。在室温下于1 M KOH中仅在1.72 V左右，而在80°C在6 M KOH中仅在1.57 V左右。