在罗姆双面Pt-Ni纳米框架电催化剂中控制架构
Nigel Becknell1,2, Yoonkook Son1, Dohyung Kim3
1Department of Chemistry, University of California, Berkeley , Berkeley, California 94720, United States.
Journal of the American Chemical Society
|August 9, 2017
概括
研究人员开发了新的- (Pt-Ni) 纳米框架架构,以提高电催化剂的性能. 挖掘的纳米框架设计显著提高了燃料电池和电解剂中氧气减氧反应的活性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 基于的合金是质子交换膜燃料电池和电解剂的关键电催化剂.
- 优化 (Pt) 的利用和表面活性是推动Pt合金电催化剂的关键.
研究的目的:
- 设计具有可调整的三维Pt异构的新型Pt-Ni纳米架构.
- 研究前体比对纳米框架形态和电化学性能的影响.
主要方法:
- 通过控制 Pt 和 Ni 前体比率来合成 Pt-Ni 二面体.
- 由此产生的纳米框架结构的表征 (空洞与挖掘).
- 氧降解反应 (ORR) 活性和质量活性的电化学评估.
主要成果:
- 实现了两种不同的纳米架构:完全空洞和挖掘.
- 与商业Pt/C相比,挖掘出来的Pt-Ni纳米框架具有约10倍高的ORR特异活性和约6倍高的质量活性.
- 挖掘出来的纳米框架显示了空心纳米框架的质量活动的两倍.
结论:
- 可调节的Pt-Ni纳米框架合成为高度活跃和高效的电催化剂提供了途径.
- 挖掘的纳米框架的优越性能与近地含量增加和扩展的2D板结构联系在一起,最大限度地减少埋藏的Pt部位.
- 这种架构优化了用于先进燃料电池和电解仪的Pt利用.
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