刘双任,陈金伟,朱雪婧,张洁,江义武,王瑞林.PtPb/ C 催化剂的制备及其对甲酸电氧化的催化性能[J].表面技术,2015,44(6):44-48.
LIU Shuang-ren,CHEN Jin-wei,ZHU Xue-jing,ZHANG Jie,JIANG Yi-wu,WANG Rui-lin.Preparation of PtPb/ C Catalyst and Its Electro-oxidation Catalytic Performance for Formic Acid[J].Surface Technology,2015,44(6):44-48 |
| PtPb/ C 催化剂的制备及其对甲酸电氧化的催化性能 |
| Preparation of PtPb/ C Catalyst and Its Electro-oxidation Catalytic Performance for Formic Acid |
| 投稿时间：2015-01-27 修订日期：2015-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2015.06.009 |
| 中文关键词: 燃料电池 甲酸 铂 铅 电氧化 |
| 英文关键词:fuel cell formic acid platinum lead electro-oxidation |
| 基金项目:国家自然科学基金(21306119);四川省科技支撑计划(2013FZ0034,2013JY0150);四川大学优秀青年学者基金(2013SCU04A23);东方电气集团有限公司项目(13H0844);中物院科研基金(HG2012039,KF13007) |
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| Author | Institution |
| LIU Shuang-ren | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
| CHEN Jin-wei | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
| ZHU Xue-jing | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
| ZHANG Jie | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
| JIANG Yi-wu | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
| WANG Rui-lin | College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
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| 中文摘要: |
| 目的 通过 Pb 元素的添加来提高 Pt/ C 催化剂电催化氧化甲酸的性能。 方法 通过乙二醇协助硼氢化钠还原法,以氯铂酸为 Pt 源和硝酸铅为 Pb 源制备不同原子比的 PtxPb/ C 催化剂。 采用 X 射线衍射光谱法(XRD)和透射电子显微镜技术(TEM)表征样品的晶体结构和颗粒形貌; 采用循环伏安法表征样品催化氧化甲酸的性能。 结果 利用乙二醇协助硼氢化钠还原法成功制得了 Pt 和 Pb 原子比不同的PtxPb/ C 催化剂,XRD 和 TEM 测试结果表明这些样品均为 Pt 的面心立方结构,且颗粒大小均一、分散均匀,其平均粒径为 4 nm 左右。 循环伏安测试结果表明 PtxPb/ C 催化剂催化氧化甲酸的性能优于商业 Pt/C 催化剂的催化性能,且受 Pt 和 Pb 原子比的影响,当原子比为 5 ： 1 时,其对氧化甲酸的催化性能最好,峰电位对应的 Pt 的比质量活性达到 2000 mA/ (mg Pt),远远高于商业 Pt/ C,同时计时电流曲线表明其具备良好的稳定性。 结论 Pb 原子的加入影响了 Pt 原子的电子结构,与 Pb 对 Pt 的协同作用共同促进了CO 等中间产物在 Pt 表面的快速氧化,降低了催化氧化甲酸的初始电位,促使甲酸在低电位直接氧化为 CO2和 H2O,提高了其催化氧化甲酸的峰电流,有效减轻了 Pt 中毒,提高了其催化活性。 |
| 英文摘要: |
| Objective To improve the electro-oxidation catalytic performance of Pt/ C catalyst for formic acid by adding the Pb element. Methods The PtxPb / C catalysts with different atomic ratios were prepared by an ethylene glycol-assisted NaBH4 reduction method. The structure and morphology of the catalyst were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), electrochemical performances were investigated by cyclic voltammetry. All electrochemical measurements were carried out in a conventional three-electrode electrochemical cell at 25 ℃ using cyclic voltammetry (CV) on a CHI 760B. Results The results of XRD and TEM showed that all prepared catalysts displayed typical character of Pt face center cubic phase with an average size of Pt nanoparticles at 4 nm which had an uniform dispersion on carbon support. The PtxPb / C catalysts had better electrocatalytic activity for formic acid electrocatalytic oxidation than that of JM-Pt / C. The electro-catalytic activity was affected by the atomic ratios of Pt and Pb. In addition, when the atomic ratio was 5 ： 1, the PtxPb / C catalyst showed the highest peak current den- sity (mass activity) of 2000 mA / mg Pt with better stability. Conclusion The adding of Pb atoms affects the electronic structure of Pt atoms. With the assistance of Pb to Pt, the rapid oxidation, such as CO, is promoted the intermediate products on the surface of Pt. In addition, the synergistic effect reduce the initial electric potential of catalyzing oxidation formic acid, promote formic acid directly oxidated as CO2 and H2 O, improve the peak current of catalyzing oxidation formic acid, effectively deduce the poisoning of Pt, and enhance its catalytic activity. |
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