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Pt单晶(210)、(310)和(510)阶梯晶面上CO_2电催化还原的表面过程 被引量:1

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摘要 研究Pt单晶(210)、(310)和(510)三个阶梯晶面上CO_2电催化还原的表面过程.通过改变处理条件获得单晶电极不同的表面结构.研究结果指出,当铂单晶电极表面保持其确定原子排列结构时,对CO2还原的电催化活性随晶面上(110)台阶密度的降低而减小,即Pt(210)>Pt(310)>Pt(510);当三个电极表面发生氧的吸附导致原子排列结构重建时,其电催化活性均有不同程度的提高.虽然其活性顺序未发生变化,但(110)台阶位密度越大的表面其电催化活性增加的程度越高.研究指出Pt单晶电极的表面结构越开放,其电催化活性也越高,并且在外界条件诱导下更易于转变为具有更高反应活性的表面结构.而相对有序的表面结构则比较稳定.研究结果从微观层次获得CO2与Pt单晶电极表面相互作用的规律,深化了对CO2电催化还原表面过程的认识.
出处 《中国科学(B辑)》 CSCD 北大核心 2007年第2期143-147,共5页 Science in China(Series B)
基金 国家自然科学基金(批准号:20673091 20433060 20373059) "973"计划(批准号:2002CB211804)资助项目
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