This study reports the use of Keplerate‐type {Mo72Fe30} polyoxometalate (POMs) nanostructures as a bi‐functional‐electrocatalyst for HER and OER in an alkaline medium with a lower overpotential (135 mV for HER and 264 mV for OER), and excellent electrochemical stability. The bi‐functional catalytic properties of {Mo72Fe30} POM are studied using a scanning electrochemical microscope (SECM) via current mapping using substrate generation and tip collection mode. Furthermore, the bipolar nature of the {Mo72Fe30} POM nano‐electrocatalysts is studied using the electrochemical gating via simultaneous monitoring of the electrochemical (cell) and electrical ({Mo72Fe30} POM) signals. Next, a prototype water electrolyzer fabricated using {Mo72Fe30} POM electrocatalysts showed they can drive 10 mA cm−2 with a low cell voltage of 1.62 V in lab‐scale test conditions. Notably, the {Mo72Fe30} POM electrolyzers’ performance assessment based on recommended conditions for industrial aspects shows that they require a very low overpotential of 1.89 V to drive 500 mA cm−2, highlighting their promising candidature toward clean‐hydrogen production.

中文翻译：

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使用扫描电化学显微镜和电化学门控方法揭示{Mo72Fe30}多金属氧酸盐纳米结构用于整体水分解的双功能电催化性能

本研究报告了 Keprate 型 {Mo72铁30多金属氧酸盐（POM）纳米结构作为碱性介质中 HER 和 OER 的双功能电催化剂，具有较低的过电势（HER 为 135 mV，OER 为 264 mV），并且具有优异的电化学稳定性。 {Mo的双功能催化性能72铁30} 使用扫描电化学显微镜 (SECM) 通过使用基板生成和尖端收集模式的电流映射来研究 POM。此外，{Mo72铁30通过同时监测电化学（电池）和电（{Mo72铁30} POM）信号。接下来，使用 {Mo72铁30POM 电催化剂表明它们可以驱动 10 mA cm−2在实验室规模测试条件下，电池电压低至 1.62 V。值得注意的是，{Mo72铁30基于工业方面推荐条件的 POM 电解槽性能评估表明，它们需要 1.89 V 的极低过电势来驱动 500 mA cm−2，强调了他们在清洁氢生产方面的前景。