Pd-Cu/C上甲酸根电催化氧化及其去合金化效应 |
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引用本文: | 蒋昆,王晔,林涛,蔡文斌.Pd-Cu/C上甲酸根电催化氧化及其去合金化效应[J].电化学,2014,20(4):343. |
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作者姓名: | 蒋昆 王晔 林涛 蔡文斌 |
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作者单位: | 复旦大学 化学系,能源材料协同创新中心,上海市分子催化和功能材料表面重点实验室,上海 200433 |
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基金项目: | 国家自然科学基金项目(No.21073045,No.21273046);上海市重点项目(No.11JC140200,No.08DZ2270500)资助 |
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摘 要: | 以柠檬酸钠为稳定剂,通过一锅法在乙二醇体系中制得高分散的Pd-Cu/C二元合金催化剂. 用高分辨透射电镜和XRD观察、表征其形貌和结构,经重复循环扫描对Pd-Cu/C催化剂进行去合金化处理,研究了去合金效应对甲酸根电催化氧化性能的影响. 通过吸附CO的原位ATR-IR光谱测量,初步探讨了去合金前后催化剂表面结构的改变. 研究表明,Cu的去合金化可提高Pd-Cu/C电极初始的电催化氧化活性,但不利于其长时间的活性保持;合金化Pd-Cu/C电极电催化稳定性有显著的优势.
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关 键 词: | 钯铜合金 电催化剂 甲酸根 电氧化 去合金化 |
收稿时间: | 2014-01-24 |
Electrocatalytic Oxidation of Formate on Pd-Cu/C - Effect of Dealloying Pretreatment |
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Abstract: | Carbon supported highly dispersed Pd-Cu nanoalloy catalyst toward formate electrooxidation is prepared via one-pot synthesis by using ethylene glycol as the reducing agent and sodium citrate as the stabilizer. The as-prepared catalyst is structurally characterized by TEM and XRD. The Cu dealloyment is carried out through repetitive potential cycling of the Pd-Cu/C catalyst in an acidic solution. The dealloying effect on the performance of the Pd-Cu/C is investigated by using cyclic voltammetry and chronoamperometry, and the surface structural change of Pd-Cu/C is probed by in situ ATR-IR measurement. The results show that the as-prepared Pd-Cu/C processes a better long-term stability than the dealloyed one in electrocatalytic oxidation of formate, while the dealloyed Pd-Cu/C exhibits a higher initial electrocatalytic activity. |
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Keywords: | Pd-Cu alloy electrocatalysts formate ion electrooxidation dealloying effect |
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