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;C_dl值为3.51 mF/cm²,且维持电流密度23 mA/cm²超过10 h无明显的下降趋势。

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 Ni₂P 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 C_dl 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.