PdCo/C氧还原催化剂及其抗甲醇性能(英文) |
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作者单位: | 华南理工大学化学科学学院 广东广州510640 |
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摘 要: | 以柠檬酸钠为络合剂,在乙二醇体系中采用有机溶胶法制备出了PdCo/C催化剂,XRD研究结果表明催化剂具有面心立方结构,粒度小,分散性好,同时元素钴的加入使催化剂的Pd-Pd间距缩小。采用电化学方法评价了催化剂对于氧气还原反应的活性,结果表明:PdCo/C催化剂具有比Pd/C要好的氧还原活性,同时具有Pt/C催化剂无法比拟的抗甲醇中毒能力。
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关 键 词: | 电催化剂 氧还原反应 Pd-Co/C 直接甲醇燃料电池 |
High Methanol Tolerance of PdCo/C Catalysts for Oxygen Reduction |
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Authors: | WANG Rong-fang LIU Jun-min LIAO Shi-jun |
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Abstract: | A PdCo/C catalyst was prepared by an organic colloid method using citrate as complexing agent, ethylene glycol (EG) as reducing agent and solvent. And the nanocomposition was characterized by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). XRD patterns showed Pd particles had a face-centered cubic crystal structure and small particle size. It was found that the Pd-Pd distance decreased by the addition of Co, indicating the formation of Pd-Co alloy. The electrocatalytic activities were evaluated by oxygen reduction, which was executed with cyclic voltammetric method with a rotating disk electrode system. The Pd-Co/C catalysts showed higher catalytic activities than Pd/C catalysts and, better methanol tolerance than Pt/C (Johnson-Matthey) for the oxygen reduction. The results implied that the Pd-Co/C catalyst might be a good potential cathodic catalyst for direct methanol membrane fuel cell (DMFC). |
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Keywords: | electrocatalysts Pd-Co/C oxygen reduction reaction direct methanol fuel cell |
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