Pt-Ru纳米晶体的形状控制:用于增强电催化甲醇氧化的调整表面结构
Liang Huang1,2, Xueping Zhang1,3, Qingqing Wang1
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun, Jilin 130022, P. R. China.
Journal of the American Chemical Society
|December 29, 2017
概括
- (PtRu) 合金纳米粒子对甲醇氧化反应具有前景. 这项研究揭示了PtRu {111} 面与{100} 面相比具有更高的活性和稳定性,为燃料电池催化剂设计提供了洞察力.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- - (PtRu) 合金纳米粒子在甲醇氧化反应 (MOR) 中具有较高的电催化活性和耐碳中毒性.
- 了解PtRu纳米粒子的面依赖性质对于优化催化剂性能至关重要,但由于合成困难而具有挑战性.
研究的目的:
- 为具有可调节面的明确PtRu纳米晶体开发一种一般合成方法.
- 研究表面活性剂的结构指导作用和PtRu纳米晶体的形成机制.
- 系统地评估PtRu纳米晶体对MOR的侧面依赖电催化性能.
主要方法:
- 控制形态的超薄PtRu纳米晶体的一步溶热合成 (纳米线,纳米棒,纳米立方体).
- 使用各种表面活性剂并进行控制实验和依赖时间的研究以了解形成机制.
- 作为MOR的模型催化剂,对{100}和{111}面封闭的PtRu纳米晶体进行电化学评估.
主要成果:
- 成功合成了可调整形态和可控制面的PtRu纳米晶体 ({100}和{111}).
- 与{111}终结的PtRu纳米线相比,MOR的稳定性 (2.28倍) 和电催化质量活性 (4.32倍) 与{100}终结的PtRu纳米线和商业Pt/C相比显著更高.
- 与{111}方面相比,PtRu {111}方面表现出更高的甲醇氧化活性和更强的耐碳中毒性.
结论:
- 与{100}相比,PtRu {111} 面对甲醇氧化反应具有更高的电催化性能.
- 开发的合成方法提供了明确的PtRu纳米晶体,作为基本燃料电池研究的理想模型电催化剂.
- 这项工作有助于理解PtRu合金在能源应用中的面依赖催化.
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