Electrochemical water splitting is crucial for sustainable energy and environmental conservation, meeting global energy needs while addressing environmental concerns. However, unlocking its potential requires addressing substantial technical and scientific challenges. Crystalline/amorphous composite catalysts represent a significant advancement in water-splitting research, with unique structural compositions and tailored properties that outperform conventional catalysts, thereby enhancing the efficiency and performance in essential aspects. In this study, crystalline/amorphous-structured FeCo alloy/FeCoNi-Pi (phosphate) was synthesized through one-step electrodeposition on Ni foam (NF). While FeCo alloy demonstrates excellent conductivity, the incorporation of FeCoNi-Pi enhances active site availability, improves hydrophilicity, and optimizes electrocatalytic reaction kinetics. Consequently, crystalline/amorphous FeCo alloy/FeCoNi-Pi required significantly lower overpotentials of 77/233 mV for the hydrogen/oxygen evolution reaction (HER/OER) compared to the FeCo alloy to acquire 10 mA cm⁻² current density in an alkaline environment. A complete cell comprised of crystalline/amorphous FeCo alloy/FeCoNi-Pi electrodes exhibits remarkable long-term stability and demonstrates a relatively lower voltage of 1.56 and 1.69 V, enabling 10 and 100 mA cm⁻² current densities. This crystalline/amorphous composite strategy has been proven effective in designing FeCo alloy-based electrocatalysts to achieve efficient hydrogen production.

中文翻译：

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用于高效整体水分解的结晶/非晶 FeCo 合金/FeCoNi-Pi 双功能电催化剂

电化学水分解对于可持续能源和环境保护、满足全球能源需求并解决环境问题至关重要。然而，释放其潜力需要解决重大的技术和科学挑战。结晶/非晶复合催化剂代表了水分解研究的重大进步，具有优于传统催化剂的独特结构组成和定制性能，从而提高了关键方面的效率和性能。在这项研究中，通过在泡沫镍（NF）上一步电沉积合成了晶体/非晶结构的 FeCo 合金/FeCoNi-Pi（磷酸盐）。虽然 FeCo 合金表现出优异的导电性，但 FeCoNi-Pi 的加入增强了活性位点的可用性，提高了亲水性，并优化了电催化反应动力学。因此，与FeCo合金相比，结晶/非晶FeCo合金/FeCoNi-Pi在析氢/析氧反应（HER/OER）中所需的过电势明显较低，为77/233 mV，才能在碱性环境中获得10 mA cm ^-2电流密度。由晶体/非晶FeCo合金/FeCoNi-Pi电极组成的完整电池表现出显着的长期稳定性，并表现出相对较低的电压（1.56和1.69 V），可实现10和100 mA cm ^-2电流密度。这种晶体/非晶复合策略已被证明在设计基于 FeCo 合金的电催化剂以实现高效制氢方面是有效的。