Pt-Co@Pt八面体纳米晶体:通过金属间核心和超薄外提高其活性和耐久性
Minghao Xie1, Zhiheng Lyu1, Ruhui Chen1
1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
Journal of the American Chemical Society
|May 27, 2021
概括
研究人员开发了具有Pt-Co核心和Pt外的新型- (Pt-Co) 纳米晶体. 这些先进的催化剂在燃料电池中显著提高了氧降解反应 (ORR) 的性能和耐用性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 控制燃料电池的双金属纳米晶体中的原子排列是一个挑战.
- 现有的- (Pt-Co) 催化剂在同时散装和表面原子控制方面存在局限性.
研究的目的:
- 合成Pt-Co@Pt八面体纳米晶体,控制体积和表面原子结构.
- 评估这些新型纳米晶体的催化性能和耐用性,用于氧降解反应 (ORR).
主要方法:
- 合成Pt-Co@Pt八面体纳米晶体,具有金属间Pt-Co核心和超薄的Pt外.
- 使用纳米晶体表面的 {111} 方面.
- 氧降解反应 (ORR) 的电催化评估.
- 经过3万个周期的加快耐用性测试.
主要成果:
- 合成的纳米晶体呈现出一个金属间,面中心的四边形Pt-Co核心和Pt外.
- 实现了2.82 A mg-1的质量活性和9.16 mA cm-2的ORR,显著超过商业Pt/C催化剂.
- 经过3万次循环后,质量活动仅下降了21%.
结论:
- 开发的Pt-Co@Pt纳米晶体为ORR提供了卓越的催化活性和稳定性.
- 这种合成策略为设计精确控制的纳米结构的先进电催化剂提供了途径.
- 这些发现有望提高燃料电池技术的效率和寿命.
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