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利用动态金属氧化物接口进行持久活性燃料电池电催化
Yuefei Cui1, Liang Chang1, Xiangyu You2
1Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China.
Advanced materials (Deerfield Beach, Fla.)
|February 12, 2026
概括
燃料电池中的金属氧化物接口表现出动态的"呼吸"行为,增强氧减少反应 (ORR) 的活性和稳定性. 这一策略克服了催化剂性能和耐用性之间的权衡.
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:
- 金属氧化物接口显著影响电催化剂性能.
- 了解这些接口在操作条件下的动态行为至关重要.
- 一个持续的挑战是平衡催化剂活性与长期稳定性.
研究的目的:
- 研究MOx/Pt系统在氧减少反应 (ORR) 期间的动态接口行为.
- 探索动态接口如何克服燃料电池催化剂中的活动稳定性权衡.
- 展示一种可推广的策略,以提高活动和耐用性.
主要方法:
- 精确定义的 (Pt) 八面体的制造,用超薄的p块金属氧化物 (MOx) 覆盖层装饰.
- 在不同电位下进行电化学测试,以研究氧减少反应 (ORR).
- 分析接口演变及其与催化性能和稳定性的相关性.
主要成果:
- 一个动态的,动态的,动态的
- 呼吸 呼吸 呼吸 呼吸
- 在MOx/Pt (M = In, Sn, Sb) 系统中观察到接口行为.
- 降低电位形成了缺氧的M-Pt接口,通过电荷转移促进ORR活动 (In-Pt > Sn-Pt ~ Sb-Pt).
- 氧化潜力产生了富含氧的M-O-Pt结构,抑制了Pt溶解并提高了耐久性,特别是SnOx.
结论:
- 利用动态金属氧化物接口是改进电催化剂的新和可通用的策略.
- 这种方法有效地打破了各种Pt和Pt双金属催化剂的活性稳定性权衡.
- 在InSnOx装饰的PtCo催化剂中取得的成功表明了其广泛的应用.
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