Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation

被引：23

作者：

Tengco, John Meynard M. ^{[1
]}

Mehrabadi, Bahareh Alsadat Tavakoli ^{[1
]}

Zhang, Yunya ^{[1
]}

Wongkaew, Akkarat ^{[2
]}

Regalbuto, John R. ^{[1
]}

Weidner, John W. ^{[1
]}

Monnier, John R. ^{[1
]}

机构：

[1] Univ S Carolina, Coll Engn & Comp, Dept Chem Engn, 301 Main St, Columbia, SC 29208 USA

[2] Burapha Univ, Fac Engn, Dept Chem Engn, Chon Buri 20131, Thailand

来源：

CATALYSTS | 2016年 / 6卷 / 06期

基金：

美国国家科学基金会;

关键词：

electroless deposition; fuel cells; bimetallic catalyst; platinum-cobalt alloy; OXYGEN REDUCTION; FUEL-CELL; PARTICLE-SIZE; METHANOL OXIDATION; PEMFC CATHODE; ELECTROCATALYSTS; PLATINUM; COBALT; RU; MONOLAYER;

D O I：

10.3390/catal6060083

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbon-supported bimetallic Pt-Co cathode catalysts have been previously identified as higher activity alternatives to conventional Pt/C catalysts for fuel cells. In this work, a series of Pt-Co/C catalysts were synthesized using electroless deposition (ED) of Pt on a Co/C catalyst prepared by modified charge enhanced dry impregnation. X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) characterization of the base catalyst showed highly dispersed particles. A basic ED bath containing PtCl62- as the Pt precursor, dimethylamine borane as reducing agent, and ethylenediamine as stabilizing agent successfully targeted deposition of Pt on Co particles. Simultaneous action of galvanic displacement and ED resulted in Pt-Co alloy formation observed in XRD and energy dispersive X-ray spectroscopy (XEDS) mapping. In addition, fast deposition kinetics resulted in hollow shell Pt-Co alloy particles while particles with Pt-rich shell and Co-rich cores formed with controlled Pt deposition. Electrochemical evaluation of the Pt-Co/C catalysts showed lower active surface but much higher mass and surface activities for oxygen reduction reaction compared to a commercial Pt/C fuel cell catalyst.

引用

页数：19

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