Remarkably enhanced water splitting activity of nickel foam due to simple immersion in a ferric nitrate solution
Remarkably enhanced water splitting activity of nickel foam due to simple immersion in a ferric nitrate solution作者机构：Centre for Clean Environment and Energy Gfiffith University Gold Coast Campus Queensland 4222 Australia Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences Hefei 23003 China Huajie Yin and Lixue Jiang contributed equally to this work.
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2018年第11卷第8期
页 面：3959-3971页
核心收录：
学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 09[农学] 0902[农学-园艺学] 090202[农学-蔬菜学]
基 金：supported by the Australian Research Council (ARC) Discovery Project 国家自然科学基金 Griffith University New Researcher Grant (NRG)
主 题：oxygen evolution reaction water electrolysis corrosion hydroxide nickel foam
摘 要：The development of a facile method to construct a high-performance electrode is of paramount importance to the application of alkaline water electrolysis. Here, we report that the activity of nickel foam （NF） towards the oxygen evolution reaction （OER） can be enhanced remarkably through simple immersion in a ferric nitrate （Fe（NOs）s） solution at room temperature. During this immersion process, the oxidation of the NF surface by NOs- ions increases the near-surface concentrations of OH- and Ni2＋, which results in the in situ deposition of a highly active amorphous Ni-Fe hydroxide （a-NiFeOxHy） layer. Specifically the OER overpotential of the NF electrode decreases from 371 mV （bare NF） to 270 mV （@10 mA-cm-2 in 0.1 M KOH） after immersion in a 20 mM Fe（NOs）s solution for just I min. A longer immersion time results in further increased OER activity （196 mV@10 mA,cm-2 in 1 M KOH）. The overall water splitting properties of the a-NiFeOxHy@NF electrode were evaluated using a two-electrode configuration. It is worth noting that the current density can reach 25 ***-2 in 6 M KOH at an applied voltage of 1.5 V at room temperature.
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