摘要
研究了吸附在Pt/C催化剂上的Ho3+对吸附CO的电氧化的影响.结果表明,无论在中性和酸性溶液中,在较大的温度范围内,Ho3+对CO在Pt/C催化剂上的电氧化都有促进作用,其原因是吸附Ho3+的存在减弱了CO在Pt/C催化剂上的吸附强度.其次,在中性溶液中,Ho3+对吸附CO的电氧化的促进作用比在酸性溶液中大.第三,无论在酸性还是中性溶液中,温度的升高有利于发挥Ho3+对吸附CO的电氧化的促进作用.
The effect of Ho3+ adsorbed on the Pt/C catalyst on the electrooxidation of the adsorbed CO was studied. It was found that Ho3+ adsorbed on the Pt/C catalyst could promote the electrooxidation of the adsorbed CO in both neutral and acidic solutions in a large temperature range. Firstly, it is due to that Ho3+ could reduce the adsorption intensity of CO. Secondly, E-ox and E-p of CO adsorbed on the Pt-Ho3+/C catalyst in the neutral solution are more negative than that in the acidic solution, indicating that the promoting effect of Ho3+ in the neutral solution is larger than that in the acidic solution. Thirdly, in both neutral and acidic solutions, the negative shift of E-ox and E-p of CO adsorbed on the Pt-Ho3+/C catalyst increases with increase of the temperature. Thus, the increase in the temperature promotes the action of Ho3+. When the temperature is at 60 degreesC, the negative shift of E., and E-p of CO adsorbed on the Pt-Ho3+/C catalyst is sufficient to avoid poisoning of Pt catalyst by CO. In addition, Pt-Ho3+/C catalyst is easy to be prepared. Thus, it is possible to apply the Pt-Ho3+/C catalyst in PEMFC (proton exchange membrane fuel cell) and DMFC (direct methanol fuel cell).
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2004年第9期1108-1111,共4页
Acta Physico-Chimica Sinica
基金
国家重点基础研究发展规划(G2000026408)
国家高技术研究发展计划(2001AA323060
2003AA517060)
江苏省科技厅高新技术基金(BG2003022)
江苏省教育厅高新技术产业化基金(JH02-080)
黑龙江省自然科学基金(B00-04)
黑龙江省教育厅基金(10511034)
国家"211"工
