2+作为一个动态主管的Ce-incorporated (CoFeNiCuCe) 9S8纳米球多功能电催化
Sonu Kumar1, Hairong Zhao1, H R Haris1
1Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China.
研究人员开发了一种低温合成高金属硫化物 (HEMS),其中包含稀土元素. 由此产生的富含Ce的HEMS纳米球在多种电催化反应中表现出卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 高金属硫化物 (HEMS) 是有前途的电催化剂,但其合成具有挑战性,特别是在稀土元素中.
- 现有的合成方法与多金属相互作用和大原子尺寸差异作斗争.
研究的目的:
- 开发一种低温水热战略,用于制造稀土合并HEMS.
- 研究合成机制并优化成分以提高电催化活性.
- 探索这些HEMS作为多功能电催化剂的潜力.
主要方法:
- 低温 (200°C) 水热合成的Ce-纳入 (CoFeNiCuCe) 9S8纳米球.
- 时间解析研究以阐明多阶段生长途径.
- 对Cu:Ce比率的系统变化和由此产生的HEMS配置的表征.
- 对氧化演化 (OER),尿素氧化 (UOR),化演化 (HER) 和化物减少 (NO2RR) 的电催化性能测试.
- 后催化和现场拉曼分析,以及密度函数理论 (DFT) 计算.
主要成果:
- 成功合成了使用Cu2+作为动态导体的单分散 (CoFeNiCuCe) 9S8 HEMS纳米球.
- 确定了一种多阶段的生长途径,涉及阴子交换,晶格重建和凝聚.
- 富含Ce的HEMS-4 (Cu:Ce = 1:4) 显示出优越的多功能电催化性能.
- 在OER,UOR,HER和NO2RR方面,HEMS-4的性能优于低,中和高的类似物.
- DFT和实验分析表明,金属 (氧) 氧化物和d-f轨道相互作用的形成保护了活性部位.
结论:
- 已经建立了一个新的低温合成模式,用于稀土结合的HEMS.
- 开发的HEMS纳米球具有出色的多功能电催化性能.
- 这项工作推进了用于能源转换的高电催化剂的设计和应用.
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