一个超小的订制高性金属间与多个活性站点的氧降低反应
Tao Chen1, Chunyu Qiu2, Xinkai Zhang3
1Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, School of Materials Science and Engineering, Peking University, Beijing 100871, P.R. China.
Journal of the American Chemical Society
|December 28, 2023
概括
研究人员开发了超小的-铁--铜-高联金属 (PFCNCZ-HEI) 纳米粒子. 这些催化剂在燃料电池应用中显著增强了氧降解反应活性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 控制原子级多金属组合,特别是具有五个以上元素的高合金 (HEAs),存在重大挑战.
- 开发高效的电催化剂对于推进燃料电池等清洁能源技术至关重要.
研究的目的:
- 合成和描述一个超小,有序的高金属间 (HEI) 纳米粒子催化剂.
- 评估新型催化剂的氧降解反应 (ORR) 的电催化性能.
- 探索高等教育机构在质子交换膜燃料电池 (PEMFC) 中的潜力.
主要方法:
- 使用空间有限的策略合成超小 (∼2 nm) PtFeCoNiCuZn高金属间纳米粒子 (PFCNCZ-HEI).
- 通过电化学测量评估了PFCNCZ-HEI的ORR活性.
- 使用PFCNCZ-HEI作为阴极催化剂组装PEMFC并评估其性能.
- 进行理论计算以了解电子结构和活跃站点.
主要成果:
- 在0.90V与ORR相比,达到2.403A mgPt-1的超高质量活性,比商业Pt/C高19倍.
- 已证明PEMFC的功率密度为1.4 W cm-2和质量正常化额定功率为45 W mg Pt-1.
- 理论计算表明非贵金属原子的外电子模块化, 形成多个活跃中心.
结论:
- 开发的PFCNCZ-HEI纳米粒子对ORR具有特殊的电催化活性.
- 空间有限的合成策略对于创建高度有序的HEI纳米粒子是有效的.
- 这项工作为电催化中高度排序的HEI纳米粒子提供了有前途的催化剂设计.
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