摘要
在乙二醇共还原H2PtCl6和SnCl2的过程中加入Ni(NO3)2作为助剂制备了PtSn/C-Ni催化剂.程序升温还原实验检测到该催化剂中存在Sn(Ⅱ)/Sn(Ⅳ)氧化还原电对.线性扫描、单电池性能测试和CO溶出实验表明,提高催化剂中Sn(Ⅱ)/Sn(Ⅳ)的比值能显著提高催化剂的乙醇电化学氧化活性和抗CO中毒能力.催化剂电催化活性提高的原因可能是Sn(Ⅱ)/Sn(Ⅳ)电对加快了(OH)ads物种在催化剂中的传递速率,促进了乙醇电化学氧化过程中产生的类CO中间物种在Pt表面的氧化.
The PtSn/C-Ni catalyst was prepared by adding Ni （NO3）2 in the reduction process of SnCl2 and H2PtCl6 with ethylene glycol by temperature-programmed The coexistence of the Sn（Ⅱ）/Sn（Ⅳ） redox couple was detected in the catalyst reduction experiments. Linear sweep voltammetry, single cell test, and CO strip ping voltammetry experiments showed that the ethanol electro-oxidation activity and CO tolerance can be obviously enhanced by increasing the Sn（Ⅱ）/Sn（Ⅳ） ratio in the catalyst. The reason might be attributed to that the Sn（Ⅱ）/Sn（Ⅳ） redox couple accelerates the transfer rate of （OH）ads and then promotes the consequent oxidation of CO-like intermediates that are produced in the ethanol electro-oxidation process on the surface of Pt.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2008年第8期765-770,共6页
基金
国家自然科学基金(20573029).
