The development of efficient and earth-abundant electrocatalysts for overall water splitting is important but still challenging. Herein, iron phosphate (FePi) electrode is synthesized using a successive ionic layer deposition and reaction (SILAR) method on a nickel foam substrate at room temperature and is used as a bifunctional electrocatalyst for water splitting. The prepared FePi electrodes show excellent electrocatalytic activity and stability for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The FePi electrode exhibits low overpotential of 230 mV and 157 mV towards the OER and HER, respectively, with superior long-term stability. As a result, an electrolyzer that exploits FePi as both the anode and the cathode is constructed, which requires a cell potential of 1.67 V to deliver a 10 mA cm⁻² current density in 1 M KOH solution. The exceptional features of the catalyst lie in its structure and active metal sites, increasing surface area, accelerated electron transport and promoted reaction kinetics. This study may provide a facile and scalable approach to design a high-efficiency, earth-abundant electrocatalyst for water splitting.

开发用于整体水分解的高效且富含地球的电催化剂很重要，但仍具有挑战性。这里，磷酸铁（FEP我）电极在室温下使用镍泡沫基体上连续离子层沉积和反应（SILAR）方法合成的，并且被用作用于水分解的双功能电催化剂。制备的FeP i电极对氧放出反应（OER）和氢放出反应（HER）具有出色的电催化活性和稳定性。FeP i电极对OER和HER分别显示230 mV和157 mV的低过电势，具有出色的长期稳定性。结果，利用FeP i的电解槽因为构造了阳极和阴极，这需要1.67 V的电池电势才能在1 M KOH溶液中提供10 mA cm ^-2的电流密度。催化剂的突出特点在于其结构和活性金属位点，增加的表面积，加速的电子传输和促进的反应动力学。这项研究可能提供一种简便且可扩展的方法来设计用于水分解的高效，富含地球的电催化剂。