电解水产氢是绿色新能源开发的热点,而电解水制氢无法大规模推广主要受限于价格昂贵的贵金属催化剂材料,因此开发高性能、高稳定性的非贵金属催化剂成为目前电解水产氢的主要发展方向。将水热法和电沉积法结合,首先在泡沫铜(CF)上水热制备CuO催化层,随后继续电沉积NiFe合金得到CuO@NiFe/CF非贵金属复合电催化材料。利用扫描电镜、X射线衍射仪、极化曲线,交流阻抗测试以及恒电流极化等研究方法重点探讨了NiFe电沉积时间对复合电极催化析氢性能的影响。结果表明:在1mol/L KOH电解质溶液中,当NiFe电沉积时间为150s时制备得到的CuO@NiFe-150s/CF电极具有最优越的析氢性能,析氢过电位达到36mV时就可驱动10mA/cm2的电流密度,Tafel斜率为21mV/dec,且恒电电解105h后,电压值无明显变化,具有优异的稳定性。
Hydrogen production from water electrolysis is hot spot in the development of green new energy.However,the large-scale promotion of hydrogen production from water electrolysis is limited by expensive precious metal catalyst materials.Therefore,the development of non precious metal catalysts with high performance and high stability has become one of the important development area in research of water electrolysis.Hydrothermal method and electrodeposition method were combined.Firstly,the CuO catalyst layer was prepared by hydrothermal method on the copper foam(CF).Then the NiFe alloy was electrodeposited continuously on the top to prepare the CuO@NiFe/CF non noble metal composite electrocatalytic materials.The effects of electrodeposition time of NiFe alloy on the catalytic performance of the composite electrode for hydrogen evolution (HE) performance were investigated by scanning electron microscopy (SEM),X-ray diffraction (XRD),polarization curve,electrochemical impedance spectroscopy (EIS) and galvanostatic polarization.The results showed that when the electrodeposition time was 150s,the obtained CuO@NiFe-150s/CF showed the best HE performance.In 1mol/L KOH electrolyte solution,HE overpotential of 36mV could drive current density of 10 mA/cm2.The Tafel slope was only 21mV/dec.There was no obvious change in the voltage value after 105 h of constant current point solution,showing excellent stability.
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