直接甲酸燃料电池炭载Pd阳极催化剂的稳定性  

Stability of Carbon Supported Pd/C Catalyst in Direct Formic Acid Fuel Cell

作　　者：沈娟章[1] 陈滢[2] 杨改秀[3] 唐亚文[1] 陆天虹[1,4] 

机构地区：[1]江苏省新型动力电池重点实验室江苏省生物功能材料重点实验室南京师范大学化学与环境科学学院,南京210097 [2]江苏科技大学张家港校区机械与冶金工程学院,张家港215600 [3]中国科学院广州能源研究所中国科学院可再生能源与天然气水合物重点实验室,广州510640 [4]中国科学院长春应用化学研究所,长春130022

出　　处：《高等学校化学学报》2011年第11期2626-2629,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20873065;21073094)资助

摘　　要：用X射线衍射和电化学方法研究了在甲酸溶液中浸泡一段时间后的Pd/C催化剂的结构和电催化性能,发现在甲酸溶液中浸泡15 d后,Pd/C催化剂中Pd粒子的相对结晶度由1.73增加到3.34,平均粒径由4.4 nm降低到1.8 nm,对甲酸氧化的电催化活性和稳定性降低,甲酸氧化的峰电流密度由9.3 mA/cm2降低到6.7 mA/cm2.这可能是由Pd/C催化剂中的Pd在甲酸中会有一定的溶解和Pd/C催化剂能催化分解甲酸引起的.In order to understand the reason for the poor electrocatalytic stability of the Pd/C catalyst for formic acid oxidation, the changes in the structure and the electrocatalytic performance of the Pd/C catalyst after dipping in the formic acid solution for a certain time were investigated using X-ray diffraction spectroscopy and electrochemical methods. It is found that the relative crystallinity of the Pd particles of Pd/C catalyst increases from 1.73 to 3.34 and the average size decreases from 4. 4 nm to 1.8 nm after dipping in formic acid solution for 15 d. The electrocatalytic activity and stability of the Pd/C catalyst for formic acid oxidation decrease. The peak current density of formic acid oxidation decreases from 9.3 mA/cm2 to 6.7 mA/cm2. It may be due to the certain dissolution of Pd in the Pd/C catalyst and the catalytic decomposition of formic acid at the Pd/C catalyst. This result may supply a new approach for exploring the reason for the poor electrocatalytic stability of the Pd/C catalyst for the formic acid oxidation.

关 键 词：炭载Pd催化剂 甲酸氧化 甲酸分解 甲酸浸泡 直接甲酸燃料电池 

分 类 号：O646[理学—物理化学]