摘要
报道了用循环伏安法研究Eu3+和Ho3+吸附的碳载Pt-TiO2(pt-TiO2/C)催化剂对乙醇电化学氧化的助催化作用.发现无论在中性溶液中还是在酸性溶液中,当Pt-TiO2/C催化剂吸附Eu3+或Ho3+后,都可以使乙醇的电催化氧化电流密度明显增加,其原因主要是Eu3+或Ho3+都能促进吸附的CO的电氧化.
The cocatalysis of adsorbed Eu3+ or Ho3+ for the ethanol electrooxidation at Pt-TiO2/C electrode was investigated with the cyclic voltammetric technique. It was found that the electrocatalytic activities of the Pt-TiO2-Ho3+ /C and Pt-TiO2-Eu3+ /C electrodes are better than that of the Pt-TiO2/C electrode both in acidic and neutral solutions. It can be explained as follows. When ethanol is electrooxidized, the intermediates, such as CO and COH can be formed. These species would be strongly adsorbed on the Pt surface and decrease the electrocatalytic activity for the ethanol oxidation. Both Eu3+ and Ho3+ can strongly coordinate with H2O, forming OH species, which can accelerate the electrooxidation of the strongly adsorbed CO. Therefore, Both Eu3+ and Ho3+ show the promoting action for the electrooxidation of ethanol.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2004年第6期616-620,共5页
Acta Physico-Chimica Sinica
基金
国家重点基础研究发展规划(973)(G2000026408)
国家高技术研究发展规划(863)(2001AA323060
2003AA517060)
江苏省科技厅基金(BG200302)
江苏省教育厅高新技术产业化基金(JH02-080)
黑龙江省教育厅基金(10531082)资助项目
关键词
燃料电池
乙醇
电催化氧化
铕
钬
fuel cell
ethanol
electrocatalytic oxidation
europium
holmium
