工程诱导了NiCo2O4的相变,以在氧进化反应中形成增强的活性基因
Ya Yue1, Xinyu Zhong2,3, Mingzi Sun4
1Key Laboratory of Advanced Catalysis, Gansu Province, State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China.
Advanced materials (Deerfield Beach, Fla.)
|April 17, 2025
概括
在NiCo2O4催化剂中的兴奋剂促进了氧演化反应 (OER) 的活性NiCoOOH位点的形成. 这种工程催化剂显示了显著增强的电催化活性和效率.
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:
- 催化剂的动态重建对于氧演化反应 (OER) 中的活性部位形成至关重要.
- 精确控制催化剂重建以实现高效的开放式能源资源仍然是一个重大挑战.
- -氧化物是OER的有希望的电催化剂.
研究的目的:
- 开发一种含的NiCo2O4催化剂 (NiCo2O4-Fn),具有核心外结构.
- 调查活跃地点形成的机制及其对OER性能的影响.
- 提高性OER的电催化活性和效率.
主要方法:
- 用F合的NiCo2O4 (NiCo2O4-Fn) 与一个 (NH4) Ni_xCo_{1-x}F_3外的合成.
- 在现场进行拉曼和X射线吸收细结构 (XAFS) 分析.
- 电化学测试和理论计算.
主要成果:
- NiCo2O4-F1促进了富含氧空位 (Ov) 的双金属NiCoOOH活性相在较低电位 (1.2 V vs RHE) 的形成.
- 在KOH电解质中, (NH4) Ni_xCo_{1-x}F_3外转化为无形的Ni_xCo_{1-x}(OH) 2,促进了NiCoOOH的形成.
- 与未经兴奋剂的NiCo2O4.4相比,NiCo2O4-F1的内在活性增加了14倍.
- 理论计算表明,Ov站点通过优化中间吸附和降低OER能量屏障来增强电活性.
结论:
- 工程使得NiCo2O4螺旋中NiCoOOH活性基因的定向控制成为可能.
- 富含Ov的NiCoOOH活性站点显著提高了性OER的电催化性能.
- 这种方法为设计高效率的OER电催化剂提供了新的策略.
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