尖晶石
过电位
析氧
材料科学
钴
纳米线
X射线光电子能谱
氧化物
氧化钴
化学工程
拉曼光谱
催化作用
氧气
纳米技术
化学
电化学
电极
冶金
物理化学
物理
生物化学
光学
有机化学
工程类
作者
Sirui Liu,Yuxin Shi,Di Wang,Qiulan Zhang,Xinzhi Ma,Zhuoxun Yin,Pengfei Zhou,Lili Wu,Mingyi Zhang
标识
DOI:10.1016/j.jcis.2023.11.012
摘要
Cobalt-based spinel oxides have excellent oxygen evolution reaction (OER) activities and are cheap to produce; however, they have limited commercial applications due to their poor electrical conductivities and weak stabilities. Herein, we soaked Co3-xNixO4 nanowires in NaBH4 solutions, which endowed Co3-xNixO4 with significant oxygen vacancy content and decorated BOx motifs outside the Co3-xNixO4 nanowires. X-ray photoelectron spectroscopy and in situ Raman data suggest that these evolutions improved the conductivity, hydrophilicity, and increased active sites of the spinel oxides, which synergistically boosted their overall OER performances. This improved performance made the optimized BOx-covered Co2.1Ni0.9O4 nanowires generate a current density of 10 mA cm-2 when used for the OER at an overpotential of only 307 mV, maintaining excellent stability at 50 mA cm-2 for 24 h. This study provides a facile method for designing cobalt-based spinel oxide OER catalysts.
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