Nd_x作为助催化剂对PtRu/C电催化氧化甲醇活性的影响 |
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作者单位: | 北京科技大学冶金与生态工程学院 北京100083 |
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摘 要: | 采用沉积-还原法制备了PtRu-NdOx/C催化剂,借助TEM、EDS和XRD等测试手段对其进行了微结构和组成的表征.结果表明,催化剂中Pt与Ru以合金形式存在,而Nd的氧化物则以无定形形态存在.催化剂粒子的平均粒径在2nm左右,晶胞参数为0.3896nm,Nd氧化物的加入对PtRu合金的晶体结构影响不明显.采用循环伏安法和计时电流法,比较了PtRu-NdOx/C催化剂和PtRu/C催化剂对甲醇氧化的电催化活性,结果表明,加入Nd的氧化物作为助催化剂能明显提高PtRu/C催化剂对甲醇氧化的电催化性能.
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关 键 词: | 直接甲醇燃料电池 PtRu-NdOx/C催化剂 沉积-还原法 电化学催化 |
The Effect of NdO_x as Co-catalyst for the Electro-oxidation of Methanol on PtRu/C |
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Authors: | CHEN Ling WANG Xin-Dong GUO Min |
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Institution: | CHEN,Ling WANG,Xin-Dong* GUO,Min |
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Abstract: | The PtRu-NdOx /C catalysts have been prepared by deposition-reduction method. EDX?XRD, and TEM measurements have been used to characterize the composition, particle size, and crystallinity of the catalysts. The catalyst materials consist of Pt-Ru alloy particles and varying amounts of Nd oxide. The average particle size and the lattice parameter of the catalysts are about 2 nm and 0.3896 nm, respectively, which indicates that Nd oxide in PtRu-NdOx /C has no effects on the crystal structure of the Pt-Ru alloy particles. The electrocatalytic activities of the PtRu-NdOx /C catalysts and PtRu/C catalysts have been investigated by cyclic voltammetry and chronoamperometric measurements. Nd oxide can improve the degree of dispersion of the noble metals in the catalysts and as co-catalyst lead to an improvement of the catalytic activity towards methanol oxidation. |
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Keywords: | Direct methanol fuel cell PtRu-NdOx /C catalyst Deposition-reduction method Electrochemical catalysis |
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