L10-PtCo 和 L12-Pt3Co 氧降解反应中的金属间化合物:成分和结构对性能的影响
Mingwang Lu1, Yuekun Hu1, Guanhua Zhang1
1School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300131, China.
ChemPlusChem
|October 5, 2024
概括
- 合金间金属在氧降解反应 (ORR) 中表现有前景. 与L12-Pt3Co相比,L10-PtCo催化剂具有更高的活性和稳定性,这是由于优化的电子结构.
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:
- 基于白金的金属间化合物是氧减少反应 (ORR) 的高效电催化剂.
- 基于Pt的金属间的原子排列和晶体结构受到Pt:M原子比的影响,显著影响Pt的电子结构和协调环境,从而影响电催化活性.
研究的目的:
- 研究不同Pt:Co原子比对ORR的基于Pt的金属间催化剂的电催化性能和稳定性的影响.
- 为了制备和描述L12-Pt3Co和L10-PtCo金属间催化剂.
主要方法:
- 通过热来合成L12-Pt3Co和L10-PtCo催化剂,通过调节Pt和Co前体的摩尔比率.
- 对ORR的电催化活性和稳定性测试.
- 理论计算以阐明电子结构和电荷转移特性.
主要成果:
- 在0.9V下,L10-PtCo的质量活性 (MA) 为0.52A mg−1Pt,是L12-Pt3Co (0.36A mg−1Pt) 的1.44倍.
- L10-PtCo表现出增强的结构稳定性,在10,000个循环后,MA的损失仅为17.31%,而L12-Pt3Co.的损失为25.00%.
- 理论计算表明,L10-PtCo中更大的电子转移到Pt位点,优化其电子结构并降低d频段中心.
结论:
- 与L12-Pt3Co.Co相比,L10-PtCo金属间催化剂提供了优越的电催化活性和ORR的稳定性.
- 性能提升归因于L10-PtCo中Pt的优化电子结构,这是由于特定的Pt:Co比率和原子排列的结果.
- 这项研究为设计和制备基于Pt的高性能金属间电催化剂提供了宝贵的见解.
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