Electrochemical characteristics and performance of CoTMPP/BP oxygen reduction electrocatalysts for PEM fuel cell
Electrochemical characteristics and performance of CoTMPP/BP oxygen reduction electrocatalysts for PEM fuel cell
复制标题
DOI：
10.1016/j.elecom.2005.12.018
复制
发表时间：
2006-03
影响因子：
5.4
通讯作者：
Zifeng Ma;Xian-Yu Xie;Xiao-xia Ma;Dong-yun Zhang;Q. Ren;N. Heß-Mohr;V. M. Schmidt
中科院分区：
文献类型：
--
作者：
Zifeng Ma;Xian-Yu Xie;Xiao-xia Ma;Dong-yun Zhang;Q. Ren;N. Heß-Mohr;V. M. Schmidt
采用微波合成方法制备了CoTMPP/BP氧还原电催化剂。通过电化学特性和性能的测定，研究了用6M hno3和30wt % h2o2预处理BP2000碳载体对氧还原电催化剂活性的影响。leich - koutecky图显示，CoTMPP/BP上氧还原过程中转移电子数在2 ~ 4之间。观察到的证据表明，过氧化氢的生成发生在两个电子的氧还原过程中，过氧化氢的进一步氧化也可能发生在另外两个电子的高电位中。在实际PEM燃料电池条件下，考察了不同CoTMPP/BP电催化剂对单个电池燃料电池性能的影响。对于氢氧燃料电池系统，在50℃时最大输出功率密度达到150mW/cm2。对CoTMPP/BP电催化剂在200mA/cm2恒定输出电流密度下进行寿命测试，单电池输出电压维持在0.5V左右900min以上，燃料电池条件下性能没有明显下降。
Microwave synthesis method was applied to prepare CoTMPP/BP oxygen reduction electrocatalysts. The influence of the pre-treatment of BP2000 carbon supports by 6M HNO3and 30 wt% H2O2on the activity of electrocatalysts for oxygen reduction was investigated by means of the measurements of their electrochemical characteristics and performances. Levich–Koutecky plot shows that the number of transferred electrons during oxygen reduction on CoTMPP/BP is found to be between 2 and 4. The observed evidence indicated that the production of hydrogen peroxide has occurred during oxygen reduction in two electrons, and further oxidation of hydrogen peroxide involving two other electrons in the higher potential may also occur. The fuel cell performance of single cells with the different CoTMPP/BP electrocatalysts was examined under actual PEM fuel cell conditions. For hydrogen–oxygen fuel cell system, the maximal output power density reached 150mW/cm2at 50°C. Life test was carried out at a constant of the output current density of 200mA/cm2for CoTMPP/BP electrocatalyst, the single cell output voltage maintains at about 0.5V for more than 900min, there was no obvious performance degradation under fuel cell conditions.