Enhancing the stability and activity by anchoring Pt nanoparticles between the layers of etched montmorillonite for oxygen reduction reaction  

作　　者：Wei Li Wei Ding Yao Nie Xueqiang Qi Guangping Wu Li Li Jianhua Liao Siguo Chen Zidong Wei 

机构地区：[1]The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, College of Chemistry and Chemical Engineering, Chongqing University

出　　处：《Science Bulletin》2016年第18期1435-1439,共5页科学通报（英文版）

基　　金：financially supported by the National Basic Research Program of China (2012CB215500 and 2012CB720300);the National Natural Science Foundation of China (21436003, 21573029 and 51272297)

摘　　要：Proton exchange membrane fuel cells(PEMFCs)are recognized as potential environmentally friendly power sources owing to their high energy conversion efficiency and low pollutant emissions[1–4].However,the insufficient electrocatalytic durability of Pt cathode catalysts remains one of the major obstacles for their wide applications[5–8].The Pt cathode catalyst is predominantlyProton exchange membrane fuel cells （PEMFCs） are rec- ognized as potential environmentally friendly power sour- ces owing to their high energy conversion efficiency and low pollutant emissions [1-4]. However, the insufficient electrocatalytic durability of Pt cathode catalysts remains one of the major obstacles for their wide applications [5-8]. The Pt cathode catalyst is predominantly operated under harsh potential fluctuations, particularly during start- up and shut-down cycles where the electrode potential can locally reach values up to 1.5 V [1, 6, 9, 10]. At such a high potential, both the corrosion of carbon support and the dissolution of Pt followed by particle growth due to Ost- wald ripening inevitably occur, leading to the degradation of catalytic performance [9, 11, 12]. To address this issue, the modification of the interaction between Pt NPs and carbon materials by decorating Pt NP surfaces with mole- cules or tuning the chemical and physical properties of the carbon supports have been developed. These approaches are proved to be efficient in suppressing the agglomeration and migration of Pt NPs [9, 13-18]. However, to meet the commercial requirement in stability at low Pt loading, further improvement is still needed and remains great challenges for the catalysis of oxygen reduction reaction （ORR）.

关 键 词：铂催化剂 氧还原反应 稳定性 纳米颗粒 蒙脱石 固定化 质子交换膜燃料电池 PT纳米粒子 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]