物理化学学报2011，Vol.27Issue(1)：85-90,6.
脉冲微波辅助化学还原合成Pt/C催化剂及其电催化氧还原性能
Pulse-Microwave Assisted Chemical Reduction Synthesis of Pt/C Catalyst and Its Electrocatalytic Oxygen Reduction Activity
摘要
Abstract
We prepared a Pt/C catalyst for use in proton exchange membrane fuel cells (PEMFCs) by pulse-microwave assisted chemical reduction synthesis.The microstructure and morphology of the as-prepared catalyst was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD).The catalyst's electrocatalytic performance in the oxygen reduction reaction (ORR) was measured by cyclic voltammetry (CV), linear sweep voltammetry (LSV), and constant potential polarization.The results indicate that pulse-microwave assisted chemical reduction synthesis is an efficient method to prepare PEMFC catalysts and that the pH and the microwave power largely influence the size and dispersion of Pt nanoparticles.At pH 10 and at a microwave power of 2 kW, the Pt nanoparticles were found to be uniform in size and the Pt nanoparticles size ranged between 1.3 and 2.4 nm with an average size of 1.8 nm.Additionally, the Pt nanoparticles were found to be highly dispersed on the surface of the carbon support.The electrochemical measurements showed that the electrochemical surface area (ESA) of the catalyst was 55.6 m2·g-1 and the catalyst exhibited superior performance and stability in the ORR.The maximum power density of the single cell was 2.26 W·cm-2·mg-1 for the catalyst prepared at a microwave power of 2 kW and a pH of 10 as the cathode material.The maximum power density was higher than that of the catalyst prepared using a microwave power of 1 kW (2.15 W·cm-2·mg-1) and also higher than that of the catalyst from Johnson Matthey (1.89 W·cm-2·mg-1).关键词
脉冲微波辅助化学还原/微波功率/pH值/燃料电池/Pt/C催化剂/氧还原反应分类
化学引用本文复制引用
王喜照,郑俊生,符蓉,马建新..脉冲微波辅助化学还原合成Pt/C催化剂及其电催化氧还原性能[J].物理化学学报,2011,27(1):85-90,6.基金项目
国家自然科学基金(21006073),上海市重点学科项目(B303)和博士后科学基金(20080440645,200902250)资助致谢:感谢中山大学先进能源材料研究室沈培康教授对本工作的支持. （21006073）
