A 3D porous Co–Fe–P foam fabricated using electrodeposition is presented as a high-performance and durable catalyst for both oxygen and hydrogen evolution reactions. To establish optimal Fe/Co ratio of the catalyst, Co–Fe–P films were electrodeposited with Fe/Co ratio of 0.2, 0.4, 1.1, and 3.3. Among the prepared samples, the Co–Fe–P film with the Fe/Co ratio of 1.1 (Co–Fe–P-1.1) exhibited the highest activity for the oxygen evolution reaction, which could be attributed to the transfer of the valence electron from Co to Fe and P. To improve performance of the Co–Fe–P-1.1, a 3D porous foam structure was adopted using the electrodeposition. The Co–Fe–P foam had 94 times larger electrochemical active surface area (ECSA) than the Co–Fe–P film with similar Fe/Co ratios of 1.1, resulting in an distinguished activity for the oxygen evolution reaction (294 mV at 10 mA/cm²) and hydrogen evolution reaction (73 mV at 10 mA/cm²) in an alkaline solution. Since the electrodeposited Co–Fe–P foam itself can be directly used as an electrode, it is free from binders, and microstructure of the electrode can be engineered by controlling the electrodeposition condition, leading to the enlarged ECSA and improved performance. Thus, the Co–Fe–P foam presented in this study offers a facile and controllable synthesis of catalyst and electrode through an easy electrodeposition process.

中文翻译：

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3D多孔钴铁磷双功能电催化剂用于氧和氢的释放反应

使用电沉积法制备的3D多孔Co-Fe-P泡沫材料是一种用于氧气和氢气析出反应的高性能且耐用的催化剂。为了建立催化剂的最佳Fe / Co比，电沉积Fe / Co比为0.2、0.4、1.1和3.3的Co-Fe-P膜。在准备好的样品中，Fe / Co比为1.1的Co-Fe-P膜（Co-Fe-P-1.1）表现出最高的析氧反应活性，这可能是由于价电子的转移从Co到Fe和P。为提高Co–Fe–P-1.1的性能，采用了3D多孔泡沫结构并进行了电沉积。Co-Fe-P泡沫的电化学活性表面积（ECSA）比具有相似的Fe / Co比为1.1的Co-Fe-P膜大94倍，²）和在碱性溶液中的氢气析出反应（73 mA在10 mA / cm ^2时）。由于电沉积的Co–Fe–P泡沫本身可以直接用作电极，因此不含粘合剂，可以通过控制电沉积条件来设计电极的微观结构，从而扩大ECSA并改善性能。因此，本研究中介绍的Co-Fe-P泡沫通过简单的电沉积过程提供了一种容易且可控制的催化剂和电极的合成方法。