文献类型：期刊文献

英文题名：Surface SnO2 Decoration: An economical and efficient alternative to Pt shells in Pt-Co catalysts for enhanced oxygen reduction reaction

作者：Jiang, Yongjun[1,2];Huang, Tzu-Hsi[1,2,3];Chiu, Kuang-Yen[4];Lee, Sheng-Wei[3];Chen, Tsan-Yao[5,6];Jia, Yanyan[1,2];Wang, Jeng-Han[4];Wang, Kuan-Wen[3];Dai, Sheng[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[3]Natl Cent Univ, Inst Mat Sci & Engn, Taoyuan 320, Taiwan;[4]Natl Taiwan Normal Univ, Dept Chem, Taipei 116, Taiwan;[5]Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu 30013, Taiwan;[6]Natl Cheng Kung Univ, Hierarch Green Energy Mat Hi GEM Res Ctr, Tainan 70101, Taiwan

年份：2025

卷号：511

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20251318151524);WOS:【SCI-EXPANDED(收录号:WOS:001460214100001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (22376062), the Science and Technology Commission of Shanghai Municipality (24DX1400200 and 22ZR1415700), the Fundamental Research Funds for the Central Universities, and the National Council of Science and Technology, Taiwan (NSTC 113-2221-E-008-034, NSTC 112-2113-M-003-003 and 113-2218-E-008-015-).

语种：英文

外文关键词：Oxygen reduction reaction (ORR); Pt-Co catalysts; Surface decoration; Operando X-ray absorption spectroscopy

摘要：Pt-metal alloy catalysts have been regarded as improvements over traditional Pt catalysts for the oxygen reduction reaction (ORR), but suffering from instability due to the increased oxophilicity and susceptibility to oxidation. To address this issue, two strategies, Pt shell and metal-oxide decoration, have been proposed for further enhancement of ORR performance. However, comparative studies investigating how these two strategies affect the electronic structure of active sites, including their structure evolution and redox capabilities during the ORR process, are relatively limited. In this study, we decorated commercial Pt3Co catalysts with Pt shell (Pt3Co@Pt) and SnO2 species (Pt3Co-SnO2) to investigate their similarities and differences in electronic structures, dynamic evolutions, and underlying mechanisms of ORR active sites. Operando X-ray absorption spectroscopy (XAS) revealed that both strategies mitigated issues related to Pt oxidation, reaction hysteresis, and oxygen affinity in commercial Pt3Co, with SnO2 demonstrating even greater efficacy. The Pt3Co-SnO2 catalyst exhibited kinetic mass activities as high as 824 mA/mgPt with superior stability, markedly outperforming those of commercial Pt, commercial Pt3Co, and Pt3Co@Pt. Computational simulations further confirm that SnO2 surface decoration effectively masks inactive sites with high oxophilicity on Pt3Co for the excellent ORR activity, while accumulating negative charges from surface oxygen and mitigating phase segregation for enhanced ORR stability.