文献类型：期刊文献

英文题名：Synergistic Effect of Platinum Single Atoms and Nanoclusters Boosting Electrocatalytic Hydrogen Evolution

作者：Zhu, Yihui[1,2];Tian, Pengfei[1];Jiang, Hongliang[1];Mu, Jingren[2];Meng, Lu[2];Su, Xiaozhi[3];Wang, Yu[3];Lin, Yunxiang[4];Zhu, Yihua[2];Song, Li[4];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China;[4]Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China

年份：2021

卷号：3

期号：10

起止页码：2539

外文期刊名：CCS CHEMISTRY

收录：WOS:【ESCI(收录号:WOS:000794234500003)】；

基金：This work was supported by the National Natural Science Foundation of China (nos. 21838003, 91834301, and 21978278), the Shanghai Scientific and Technological Innovation Project (nos. 18JC1410500 and 19JC1410400), and the Fundamental Research Funds for the Central Universities (no. 222201718002).

语种：英文

外文关键词：electrocatalysis; hydrogen evolution; single atoms; active sites; synergistic effect

摘要：Maximizing atomic utilization of precious metal-based catalysts is of great significance in heterogeneous catalysis, also becoming a useful strategy to develop efficient electrocatalysts for hydrogen evolution reaction (HER). Although the dispersion of platinum (Pt) as single atoms (SAs) has increasingly been used in the design of HER electrocatalysts, it is still controversial if the SAs possess higher reactivity relative to the nanoparticles with identical atom loading. Here, by virtue of computational studies, we find that atomic step-rich Pt clusters and defective graphene (DG)-loaded Pt SAs are beneficial to water dissociation and hydrogen coupling, respectively, predicting that decent activity and high atomic utilization for alkaline HER electrocatalysis will be exhibited on the structure that integrates both Pt SAs and nanoclusters onto the DG matrix (PtSA/NC-DG). We experimentally synthesize the PtSA/NC-DG catalyst for alkaline HER. The optimized PtSA/NC-DG delivers an overpotential of 41 mV at a current density of 10 mA cm(-2) and mass activity of 5.4 mA mu g(pt)(-1) at the overpotential of 100 mV. The mass activity is nearly 6 and 10 times higher than that of its Pt SA counterpart and commercial PVC catalyst. This work deepens the knowledge of the synergistic effect of single atoms and nanoclusters for alkaline HER electrocatalysis. [GRAPHICS] .