表面技术Issue(7)：50-55,6.DOI:10.16490/j.cnki.issn.1001-3660.2015.07.010
恒压电沉积Pt-Ni合金催化剂的形貌控制及其对催化剂性能的影响
Morphology Control of Pt-Ni Alloy Electrocatalysts Prepared by Potentiostatic Electrodeposition and Application in PEMFC Cathode
摘要
Abstract
ABSTRACT:Objective To artificially control the morphology and electro-catalytic performance of Pt-Ni alloy catalysts in the process of electrodeposition by controlling the parameters of carbon cloth hydrophilicity and electrolyte temperature. Methods Po-tentiostatic electrodeposition was employed to prepare Pt-Ni alloy catalysts with different morphologies. 5 wt% Nafion was used to modify the surface hydrophilicity of the carbon cloth substrates. The electrolyte temperature was subsequently controlled. The phy-sical and electrochemical performances of the electrodeposited catalysts were characterized by X-ray diffraction ( XRD) , scanning electron microscope (SEM), energy dispersive spectrograph (EDS), cyclic voltammetry (CV), and single cell polarization test technique. Results The Pt-Ni alloy particles electrodeposited on the Nafion-modified carbon cloth were fine and homogeneous. Sin-gle cell performance of the electrode with moderate Nafion loading of 0. 8 mg/cm2 was the best. Compared with Pt-Ni alloy with snowflake-like particles fabricated at lower temperature, the Pt-Ni alloy with spherical particles fabricated at higher electrolyte tem-perature had higher electrochemical active surface area ( ECSA) and better electrocatalytic performance. Among them, the Pt-Ni prepared at 50 ℃ had the highest ECSA of 47. 6 m2/(g Pt) and the highest power density of 77. 8 mW/cm2 in single cell. Con-clusion The electrocatalytic performance of Pt-Ni electrodeposited on the Nafion-modified carbon cloth is more superior to that of unmodified samples. Electrolyte temperature has significant impact on the morphology of electrodeposited Pt-Ni alloy catalysts.关键词
电化学活性表面积/Pt-Ni合金/氧还原/质子交换膜燃料电池Key words
ECSA/Pt-Ni alloy/ORR/PEMFC分类
化学化工引用本文复制引用
陈泽霖,张华..恒压电沉积Pt-Ni合金催化剂的形貌控制及其对催化剂性能的影响[J].表面技术,2015,(7):50-55,6.基金项目
江苏高校优势学科建设资助项目(SKL200608SIC) Fund：Priority Academic Program Development of Jiangsu Higher Education Institutions(SKL200608SIC) （SKL200608SIC）
