W-Ni2P@NiFe LDH/NF的合成及其用于高效电催化析氧研究
Synthesis of W-Ni2P@NiFe LDH/NF for high efficiency electrocatalytic oxygen evolution
刘文辉 1段永明 2王宏伟 2侯玉龙 2王琨 2刘登登2
作者信息
- 1. 中北大学环境与安全工程学院,山西 太原 030051
- 2. 山西柴油机工业有限责任公司,山西 大同 037036
- 折叠
摘要
以NiFe LDH微米级小球为骨架支撑,原位生长W掺杂Ni2P纳米片,形成了以NiFe LDH为核、W-Ni2P为壳的独特纳米阵列,并通过SEM、XRD和电化学催化性能测试等手段对W-Ni2P@NiFe LDH/NF的形貌、结构和电化学性能进行分析.结果表明,W-Ni2P@NiFe LDH/NF独特的三维球状纳米结构加快了电荷转移速率,提供了丰富的活性位点,并在W-Ni2P 与NiFe LDH之间产生协同效应,提高了析氧反应的电催化性能和耐久性.与Ni2P 和NiFe LDH相比,球状结构W-Ni2P@NiFe LDH/NF表现出优异的OER性能,在电流密度为 40 mA/cm2 时,过电势仅为251 mV;Tafel斜率仅为52 mV/dec;电化学阻抗最小;Cdl值为 3.51 mF/cm2,且维持电流密度23 mA/cm2 超过10h无明显的下降趋势.
Abstract
A unique nanoarray with NiFe LDH as core and W-Ni2P as shell is formed by in-situ growth of W-doped Ni2P nanosheets supported by NiFe LDH micron-scale pellets as skeleton.Morphology,structure and electrochemical properties of W-Ni2P@NiFe LDH/NF are analyzed by means of SEM,XRD and electrochemical catalytic performance test.The results show that the unique three-dimensional spherical nanostructures of W-Ni2P@NiFe LDH/NF accelerate the charge transfer rate,provide abundant active sites,and generate synergistic effects between W-Ni2P and NiFe LDH,thus improving the electrocatalytic performance and durability in oxygen evolution reaction(OER).Compared with Ni2 P or NiFe LDH alone,spheroidal W-Ni2P@NiFe LDH/NF exhibits excellent OER properties,delivering an overpotential of 251 mV at a current density of 40 mA·cm-2.Its Tafel slope is only 52 mV·dec-1,and its electrochemical impedance is the minimum.Its Cdl value is 3.51 mF·cm-2,and can maintain the current density at 23 mA·cm-2 for more than 10 hours without obvious downward trend.
关键词
原位生长/电化学性能/析氧反应Key words
in-situ growth/electrochemical performance/oxygen evolution reaction引用本文复制引用
基金项目
先进炭基电极材料山西省重点实验室开放研究基金(2022C80309)
出版年
2024
NETL
NSTL
万方数据