在用于燃料电池电催化 Pt 基金属间的半金属触发的共价相互作用
Han Cheng1, Renjie Gui1, Chen Chen2
1Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230029, China.
National science review
|August 9, 2024
概括
半金属原子使金属间化合物 (IMCs) 的低温合成成为可能,以改善燃料电池电催化. 这些新型催化剂表现出增强的CO耐受性和氧降低活性.
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:
- 基于的金属间化合物 (IMC) 是燃料电池等能源技术的关键电催化剂.
- 传统的IMC合成需要高温,往往会对催化剂结构和性能产生负面影响.
- 需要先进的电催化剂,具有改进的合成方法和更高的活性.
研究的目的:
- 调查半金属原子的使用,以降低基IMC的合成温度.
- 探索半金属诱导的共价相互作用对催化剂特性的影响.
- 为了提高燃料电池应用中的电催化性能,特别是CO耐受性.
主要方法:
- 半金属金属间化合物 (Pt-Ge,Pt-Sb,Pt-Te) 的合成.
- 由d-p π回联影响的结构和电子性能的表征.
- 电化学测试氧降解反应 (ORR) 活性和耐CO中毒的电化学测试.
主要成果:
- 半金属-Pt IMCs在显著较低的温度 (300K降低) 中合成.
- 证明了强大的共价相互作用 (d-p π 背链) 促进有序的 Pt-M 债券.
- 在CO中毒下达到较高的CO耐受氧降解活性 (0.794A mg-1在0.9V) 与最小的衰变 (5.1%).
结论:
- 半金属合并提供了一种新的策略,以克服IMC合成中的温度限制.
- 半金属-Pt IMC中的共价相互作用增强了电子运输和活性位点轨道填充.
- 半金属-Pt IMCs是燃料电池先进电催化剂的一个有前途的类别.
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