期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 5, 页码 6298-6308出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20504
关键词
ultrasmall PtCu; porous carbon; ethylene glycol oxidation reaction; oxygen-reduction reaction; electrocatalytic performance
资金
- Natural Science Foundation of China [51402151, 51408297, 51778281]
- Natural Science Foundation of the Jiangsu province [BK20171342, BK20161493, BK20140780]
- QingLan Project, PAPD, Jiangsu Province
- Zijin Intelligent Program, the Nanjing University of Science and Technology
- Fundamental Research Funds for the Central Universities [30917011309]
- Nanjing Normal University [184080H202B146]
Hierarchical porous carbon-encapsulated ultrasmall PtCu (UsPtCu@C) nanoparticles (NPs) were constructed based on segmentation and re-encapsulation of porous PtCu NPs by using glucose as a green biomass carbon source. The synergistic electronic effect from the bimetallic elements can enhance the catalytic activity by adjusting the surface electronic structure of Pt. Most importantly, the generated porous carbon shell provided a large contact surface area, excellent electrical conductivity, and structural stability, and the ultrasmall PtCu NPs exhibited an increased electrochemical performance compared with their PtCu matrix because of the exposure of more catalytically active centers. This synergistic relationship between the components resulted in enhanced catalytic activity and better stability of the obtained UsPtCu@C for ethylene glycol oxidation reaction and the oxygen-reduction reaction in alkaline electrolyte, which was higher than the PtCu NPs and commercial Pt/C (20 wt % Pt on Vulcan XC-72). The electrochemically active surface areas of the UsPtCu@C, PtCu NPs, and commercial Pt/C were calculated to be approximately 230.2, 32.8, and 64.0 m(2)/g(Pt) respectively; the mass activity of the UsPtCu@C for the ethylene glycol oxidation reaction was 8.5 A/mg(Pt), which was 14.2 and 8.5 times that of PtCu NPs and commercial Pt/C, respectively. The specific activity of UsPtCugC was 3.7 mA/cm(Pt)(2), which was 2.1 and 2.3 times that of PtCu NPs and commercial Pt/C, respectively. The onset potential (Eon-set) of UsPtCu@C for the oxygen-reduction reaction was 0.96 V (vs reversible hydrogen electrode, RHE), which was 110 and 60 mV higher than PtCu and commercial Pt/C, respectively. The half-wave potentials (E-1/2) of UsPtCu@C, PtCu, and Pt/C were 0.88, 0.56, and 0.82 V (vs RHE), respectively, which indicated that the UsPtCugC catalyst had an excellent bifunctional electrocatalytic activity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据