在室温下快速合成金属间稳定电催化剂
Yunfei Wang1, Du Sun1, Tomojit Chowdhury2
1Department of Materials Science and Engineering , Johns Hopkins University , Baltimore , Maryland 21218 , United States.
Journal of the American Chemical Society
|January 17, 2019
概括
研究人员开发了一种新的室温电化学合成,用于订制的金属间- (Pd31Bi12) 催化剂. 这种新型催化剂在氧降解反应中表现出极高的活性和稳定性.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 订购的金属间合金是电化学反应的高性能材料.
- 由于金属扩散的高激活能障碍,传统的有序金属间合成需要高温和长时间的反应.
研究的目的:
- 为有序的金属间纳米结构开发一种新的,快速的室温合成方法.
- 为了研究合成的金属间- (Pd31Bi12) 的电化学催化活性和稳定性.
主要方法:
- 使用直接电化学沉积来合成金属间稳定的Pd31Bi12.
- 在室温下进行合成,并在几分钟内完成.
- 评估了氧减少反应 (ORR) 的电催化活性和长期稳定性.
主要成果:
- 这项研究成功地在室温下合成了转移稳定的金属间Pd31Bi12.
- 与商业和纳米催化剂相比,Pd31Bi12对氧降解到水具有显著更高的特异活性 (超过35倍).
- 催化剂在10000次循环后保持高活性和结晶性,表明其稳定性很好.
结论:
- 一种新的,高效的室温电化学方法可以快速合成有序的金属间化合物.
- 合成的Pd31Bi12是一种高度活跃和稳定的基于的氧降解催化剂.
- 这项工作为催化剂的发现和先进金属间材料的合成开辟了新的途径.
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