期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 63, 页码 27116-27123出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.06.019
关键词
L1(0)-PtCo alloy; Strong interaction; Oxygen reduction reaction; Coating layer-free
资金
- National Key R & D Program of China [2020YFB1506002]
- National Natural Science Foundation of China [22178034,21978028, 22108020, 21808231]
- Chongqing Talent Program [cstc2022ycjh-bgzxm0096]
A coating layer-free strategy was proposed to controllably synthesize sub-4 nm highly ordered intermetallic L1(0)-PtCo catalyst, and the strong interaction between N-doped carbon (NC) and PtCo(OH)x as well as the oxygen vacancies generated by thermal decomposition play crucial roles in the synthesis of L1(0)-PtCo alloy.
The ordered intermetallic PtM alloys with L10 structure are considered as the most promising oxygen reduction reaction (ORR) catalysts owing to the strong chemical bond between Pt and M atoms effectively suppresses the leaching of M atoms. However, the preparation of ultrafine L1(0)-PtM alloy nanoparticles with high ordering degree is still a challenge because the nanoparticles tend to agglomerate during high-temperature annealing. Herein, we propose a coating layer-free strategy to controllably synthesize sub-4 nm highly ordered intermetallic L1(0)-PtCo catalyst. The strong interaction between N -doped carbon (NC) and PtCo(OH)x effectually inhibits the agglomeration of nanoparticles during thermal treatment, while the O vacancies generated by the thermal decomposition of PtCo(OH)x are beneficial to prepare the highly ordered intermetallic L1(0)-PtCo alloy. The as-obtained L1(0)-PtCo/NC alloy catalyst shows excellent ORR activity in both half-cell and single cell tests, which is much better than that of disordered A1-PtCo/NC and commercial Pt/C catalysts. This work provides a facile and efficient method for fabricating the ordered intermetallic L10-PtM alloy catalysts with high ordering degree. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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