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Ti基体上,通过电沉积-置换的方法制备了具有蜂窝状结构的Pt-Ni-P/Ti催化电极.采用扫描电镜(SEM)、X射线衍射(XRD)对催化剂进行了表征.通过阳极线性伏安扫描法(LSV)、连续循环伏安法(CV)、预吸附单层CO溶出法研究了其甲醇氧化催化活性和抗CO中毒能力.SEM测试结果显示,非晶态Ni-P置换制备的Pt-Ni-P催化剂受“异地溶解-沉积”机理的影响而呈蜂窝状结构,而晶态Ni置换制备的Pt-Ni催化剂受“原位溶解-沉积”机理呈麦粒状.电化学测试结果表明,Pt-Ni-P/Ti电极在碱性介质中的甲醇氧化起始电位和CO氧化起始电位均比Pt-Ni/Ti电极更负,表明P掺杂可以增强Pt-Ni的甲醇氧化催化活性和抗CO中毒能力.
Ti substrate, a Pt-Ni-P / Ti catalyst electrode with honeycomb structure was prepared by electrodeposition-displacement method.The catalyst was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) Voltammetric scanning (LSV), continuous cyclic voltammetry (CV) and pre-adsorption monolayer CO dissolution method were used to study the catalytic activity of methanol oxidation and anti-CO poisoning.The results of SEM showed that amorphous Ni-P replacement preparation Pt-Ni-P catalyst was honeycomb structure under the influence of “Dissolved-Deposition ” mechanism, and the Pt-Ni catalyst prepared by the substitution of crystalline Ni was grainy by the mechanism of "in situ dissolution- .The results of electrochemical tests showed that both the methanol oxidation initiation potential and the CO oxidation initiation potential of Pt-Ni-P / Ti electrode in alkaline medium are more negative than that of Pt-Ni / Ti electrode, indicating that P-doping can enhance Pt -Ni methanol oxidation catalytic activity and anti-CO poisoning ability.