Min Song, Guanyu Luo, Qian Zhang, Hanyu Hu, Deli Wang
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引用次数: 0
摘要
确定控制催化性能的描述符是设计高活性、高稳定性催化剂的关键。作为与催化活性相关的间接描述符，调节Pt-Pt原子间距离和d带中心可以有效地提高ORR活性。Pt-Pt原子间距离与表面应变密切相关。本文通过用其他过渡金属（M = Fe, Co， Ni和Cu）部分取代PtMn/C二元金属间化合物中的Mn，构建了PtMnM/C三元金属间化合物。3d过渡金属掺杂引起表面应变，PtMnM/C的ORR性能与Pt-Pt原子间距离和d带中心均呈火山关系。最佳应变的PtMnCo/C在0.9 V时表现出最高的质量活性（1.06 A mgPt−1），分别是PtMn/C和商用Pt/C催化剂的2.6倍和4.6倍。此外，PtMnCo/C表现出良好的耐久性，在5万次电位循环后只有10 mV半波电位衰减。
Optimizing the ORR performance of PtMnM ternary intermetallics by tuning the surface strain
Identifying the descriptors that control catalytic performance is key to design catalysts with high activity and stability. As indirect descriptors related to catalytic activity, modulating the Pt–Pt interatomic distance and d-band center can effectively enhance the ORR activity. It is well recognized that the Pt–Pt interatomic distance is strongly correlated with the surface strain. Herein, PtMnM/C ternary intermetallics are constructed through partially replacing Mn in PtMn/C binary intermetallics with the other transition metal (M = Fe, Co, Ni, and Cu). The 3d-transition metal doping induces surface strain, and the ORR performance of PtMnM/C exhibits volcano relationship relative to both the Pt–Pt interatomic distance and d-band center. The PtMnCo/C with optimum strain exhibits the highest mass activity (1.06 A mgPt−1) at 0.9 V, which is 2.6 and 4.6 times higher than that of PtMn/C and commercial Pt/C catalysts, respectively. In addition, PtMnCo/C shows good durability with only 10 mV half-wave potential decay after 50,000 potential cycles.
期刊介绍：
Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field.
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