Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
Division of Physics and Semiconductor Science, Dongguk University, Seoul 100-715, South Korea.
J Colloid Interface Sci. 2019 Jan 15;534:350-356. doi: 10.1016/j.jcis.2018.09.015. Epub 2018 Sep 6.
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 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.
开发高效且丰富的地球资源电催化剂用于整体水分解非常重要，但仍然具有挑战性。在此，通过室温下的连续离子层沉积和反应（SILAR）方法在泡沫镍基底上合成了磷酸铁（FePi）电极，并将其用作水分解的双功能电催化剂。所制备的 FePi 电极在析氧反应（OER）和析氢反应（HER）中表现出优异的电催化活性和稳定性。FePi 电极对 OER 和 HER 的过电势分别低至 230 mV 和 157 mV，具有优异的长期稳定性。因此，构建了一个利用 FePi 作为阳极和阴极的电解槽，在 1 M KOH 溶液中，该电解槽需要 1.67 V 的电池电势才能输送 10 mA cm 的电流密度。该催化剂的卓越性能源于其结构和活性金属位点，增加了表面积、加速了电子传输并促进了反应动力学。这项研究可能为设计高效、丰富的地球资源电催化剂用于水分解提供了一种简便且可扩展的方法。
