在co纳米颗粒中Ru-Incorporation诱导的相位过渡,以低度的氧化电还原到低电位的氨
Dongdong Wang1,2, Guilan Fan3, Deyan Luan1
1Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|November 7, 2024
概括
研究人员开发了一种新的电催化剂 (hcp-RuCo),用于将氧化 (NO) 转化为氨 (NH3). 这种催化剂在减少NO方面表现出高效率,为循环失衡提供了潜在的解决方案.
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
- 催化剂是一种催化剂.
背景情况:
- 循环被破坏,电催化将氧化 (NO) 转化为氨 (NH3) 是一个潜在的解决方案.
- 有效的NO降解反应 (NORR) 电催化剂的设计具有挑战性,特别是对于低NO度的电催化剂.
研究的目的:
- 开发一个高效的电催化剂为NORR使用排位合金战略.
- 通过结合 (Ru) 来研究 (Co) 纳米颗粒的相位过渡到六角密封 (hcp) 结构.
主要方法:
- 在碳纳米板上创建RuCo合金纳米颗粒的排位合金策略.
- 从面部中心立方体 (fcc) 到hcp结构的相位过渡,由Ru结合引起.
- 对NORR和NH3产量测量的电催化活性测试.
- 密度函数理论 (DFT) 计算以了解催化机制.
主要成果:
- 这种hcp-RuCo合金表现出高的NORR活性,其法拉第效率达到99.2%,NH3产量为77.76μg h-1 mgcat-1在-0.1 V下.
- 在低NO度 (1体积%) 的情况下,hcp-RuCo催化剂的性能优于fcc Co纳米粒子和其他报告的NORR催化剂.
- DFT的计算表明,hcp阶段优化了Co站点的电子结构,并降低了速率决定阶段的能量屏障.
结论:
- hcp-RuCo合金是NORR的高效电催化剂,为低度NO转换提供了一个有希望的方法.
- 阶段过渡策略有效地提高了NORR的电催化性能.
- 使用hcp-RuCo阴极组装的Zn-NO电池实现了显著的功率密度和NH3产量.
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