Iron-nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities
Iron-nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities
复制标题
泡沫镍支撑的氢氧化铁镍纳米片阵列，具有在高电流密度下析出氧气的显着催化性能
DOI：
10.1002/er.5636
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发表时间：
2020
影响因子：
4.6
通讯作者：
Feng Yuan-Yuan
中科院分区：
文献类型：
--
作者：
Hu Hua-Shuai;Si Si;Liu Rui-Jie;Wang Chong-Bin;Feng Yuan-Yuan
采用水热法在泡沫镍上制备了厚度约为4.5nm的超薄FeNiO（x）H（y）纳米片阵列。在碱性条件（1.0M KOH）下研究所获得的样品（FeNiOxHy/NF）的析氧反应（OER）性质。优化后的FeNiOxHy/NF显示出极小的过电位（仅为195和306 mV），分别实现10和1000 mA cm（-2）的电流密度，并且在160小时的稳定性测试期间，即使电流密度高达1000 mA cm（-2），也几乎没有显示出电位衰减，证明了出色的OER催化活性和耐久性。FeOOH和由NF基底的表面Ni原子的原位氧化产生的NiOOH是活性位点。FeOOH和NiOOH之间的协同效应是高性能的原因。据我们所知，FeNiOxHy/NF催化剂的高活性和稳定性优于迄今报道的几乎所有OER催化剂。这些信息的发现不仅是有价值的理解OER的机制，而且在高电流密度下的工业水电解的廉价过渡金属催化剂的设计。
Ultrathin FeNiO(x)H(y)nanoflake arrays with the thickness of only similar to 4.5 nm were prepared on Ni foam (NF) via a facile hydrothermal reaction. The oxygen evolution reaction (OER) properties of the obtained sample (FeNiOxHy/NF) were investigated under alkaline conditions (1.0 M KOH). The optimized FeNiOxHy/NF displays extremely small overpotentials of only 195 and 306 mV to achieve the current densities of 10 and 1000 mA cm(-2), respectively, and shows almost no potential attenuation during the 160 hours of stability test even the current density is up to 1000 mA cm(-2), demonstrating brilliant OER catalytic activity and durability. FeOOH and the NiOOH produced from the in situ oxidation of the surface Ni atoms of the NF substrate are the active sites. The synergistic effect between FeOOH and NiOOH is responsible for the high performances. To our knowledge, the high activity and stability of FeNiOxHy/NF catalyst outperform almost all of the OER catalysts reported to date. These informative findings are valuable not only for understanding the mechanism of OER but also for the design of cheap transition metal catalysts for industrial water electrolysis at high current densities.