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Activity–Stability Relationship in Au@Pt Nanoparticles for Electrocatalysis
ACS Energy Letters ( IF 22.0 ) Pub Date : 2020-08-11 , DOI: 10.1021/acsenergylett.0c01507
Dong Young Chung 1, 2, 3 , Subin Park 1, 2 , Hyeonju Lee 4 , Hyungjun Kim 4 , Young-Hoon Chung 5 , Ji Mun Yoo 1, 2 , Docheon Ahn 6 , Seung-Ho Yu 7, 8 , Kug-Seung Lee 6 , Mahdi Ahmadi 8 , Huanxin Ju 9 , Héctor D. Abruña 8 , Sung Jong Yoo 10, 11 , Bongjin Simon Mun 3 , Yung-Eun Sung 1, 2
Affiliation  

Despite breakthroughs in the activity of electrocatalysts for the oxygen reduction reaction (ORR), the development of nanoscale ORR electrocatalysts is still hindered by their instability. Here, to bridge the functional link between activity and stability, well-controlled Au@Pt (core@shell) nanoparticles are investigated. In situ monitoring of atomic dissolution and physicochemical analysis in conjunction with theoretical calculations reveal that the atomic-level stability of Au@Pt nanoparticle is attributed to the low surface coverage of OH and oxide on Pt, balancing between strain and ligand effect of Au at the interface. Considering the relationships in activity–stability–oxophilicity, the functional links between activity and stability in the ORR are discussed, and the regulation of oxophilicity is suggested as a guideline for designing highly active and durable electrocatalysts for fuel cell applications.

中文翻译:

Au @ Pt纳米粒子电催化活性与稳定性的关系

尽管在氧还原反应(ORR)的电催化剂活性方面取得了突破,但纳米ORR电催化剂的不稳定性仍然阻碍了其发展。在这里,为架起活性和稳定性之间的功能联系,研究了控制良好的Au @ Pt(核壳)纳米颗粒。原位对原子溶解和理化分析的监测以及理论计算表明,Au @ Pt纳米粒子的原子级稳定性归因于OH和氧化物在Pt上的低表面覆盖率,以及界面处Au的应变和配体效应之间的平衡。考虑到活性-稳定性-亲氧性之间的关系,讨论了ORR中活性与稳定性之间的功能联系,并提出了亲氧性调节作为设计用于燃料电池应用的高活性和持久性电催化剂的指南。
更新日期:2020-08-11
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