在缺陷Ceria上支持Pt单个原子作为性进化的活跃和稳定的双位元催化剂
Vandung Dao1, Giovanni Di Liberto2, Sunny Yadav1
1Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
这项研究证明了一种新的双位点催化剂,单原子在缺陷丰富的上,用于高效的性进化. 这种催化剂显示出高活性和耐用性,为商业催化剂提供了一个有希望的替代品.
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:
- 进化反应 (HER) 对于清洁能源生产至关重要.
- 为性HER开发高效和稳定的电催化剂仍然是一个重大挑战.
- 基于的催化剂具有高度活性,但价格昂贵,并且在性介质中通常具有较差的耐用性.
研究的目的:
- 评估在缺陷丰富的 (CeO2) 上使用单原子 (Pt1) 作为性HER的双位点催化剂的可行性.
- 研究Pt1/CeO2催化剂的催化活性,稳定性和机制.
- 为了比较Pt1/CeO2与商业在碳 (Pt/C) 催化剂上的性能.
主要方法:
- 在缺陷丰富的 (Pt1/CeO2) 上合成Pt单原子 (1.0重量%) .
- 性介质中的催化剂的电化学表征,包括超电位和Tafel斜率测量.
- 耐久性测试用于评估催化剂的稳定性.
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- 在溶液中,Pt1/CeO2催化剂表现出较低的过电位和小的Tafel斜率.
- 催化剂表现出高质量活性和优异的耐用性,与商业的20%Pt/C相当.
- DFT的计算揭示了一种双站点机制,涉及缺陷的CeO2用于水解离和Pt2+单个原子用于H2形成.
结论:
- 具有分散的Pt单个原子的富含缺陷的体作为性HER的有效双位点催化剂.
- 在CeO2和Pt2+单个原子中氧气空缺之间的协同效应提高了催化性能.
- 这种方法为开发具有更好的活性和稳定性的先进性HER催化剂提供了新的策略.
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