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In situ precise anchoring of Pt single atoms in spinel Mn3O4 for a highly efficient hydrogen evolution reaction
Energy & Environmental Science ( IF 32.5 ) Pub Date : 2022-09-06 , DOI: 10.1039/d2ee02151j
Jinxin Wei, Kang Xiao, Yanxiang Chen, Xing-Peng Guo, Bolong Huang, Zhao-Qing Liu

Although the synthesis of single atom catalysts (SACs) has attracted intensive attention for the hydrogen evolution reaction (HER), realizing the precise control of the structure of atomic catalysts and the electronic metal–support interaction is still highly challenging. The understanding of SACs at the atomic level is particularly important for further improving their electrochemical performances. Herein, we have reported the synthesis of a spinel Mn3O4 supported Pt SAC (PtSA–Mn3O4) based on the in situ precise anchoring of the Pt atoms in the octahedral sites for the first time. The strong interactions between Pt and Mn3O4 have significantly modulated the electronic structures with an optimized d-band center and binding strength of intermediates. In an alkaline environment, the catalyst shows an excellent HER performance with an ultra-low overpotential of 24 mV at 10 mA cm−2 and a high mass activity of 374 mA mg−1Pt (50 mV), which are superior to those of 20 wt% Pt/C and the most reported high-performance catalysts. This work has supplied insightful information for the rational design of efficient SACs with high controllability and superior performances.

中文翻译:

Pt 单原子在尖晶石 Mn3O4 中的原位精确锚定用于高效的析氢反应

尽管单原子催化剂(SACs)的合成引起了析氢反应(HER)的广泛关注,但实现原子催化剂结构和电子金属-载体相互作用的精确控制仍然具有很大的挑战性。在原子水平上对 SAC 的理解对于进一步提高其电化学性能尤为重要。在此,我们首次报道了基于八面体位点中Pt原子原位精确锚定的尖晶石Mn 3 O 4负载的Pt SAC(Pt SA -Mn 3 O 4 )的合成。Pt 和 Mn 3 O 4之间的强相互作用用优化的 d 带中心和中间体的结合强度显着调制了电子结构。在碱性环境中,该催化剂表现出优异的 HER 性能,在 10 mA cm -2下具有 24 mV 的超低过电位和 374 mA mg -1 Pt (50 mV)的高质量活性,优于其他催化剂。 20 wt% Pt/C 和报道最多的高性能催化剂。这项工作为合理设计具有高可控性和卓越性能的高效 SAC 提供了深刻的信息。
更新日期:2022-09-06
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