材料科学
拉曼散射
拉伤
电极
吸附
化学工程
可逆氢电极
电化学
拉曼光谱
纳米技术
化学
物理化学
工作电极
光学
内科学
工程类
物理
医学
作者
Wenling Jiao,Chen Chen,Wenbin You,Guan-Yu Chen,Shuwen Xue,Jie Zhang,Jiwei Liu,Yuzhang Feng,Peng Wang,Yizhe Wang,Huijuan Wen,Renchao Che
标识
DOI:10.1016/j.apcatb.2019.118298
摘要
Although palladium-gold (PdAu) bimetals have been extensively investigated as oxygen reduction reaction (ORR) electrocatalysts, the comprehensive mechanism studies on the strain and electronic effect are in their infancy. Herein, the strain effect and surface composition of PdAu hollow nanospheres (PdAu HSs) can be tuned by Pd-to-Au ratio. The optimal ORR performance can deliver the half-wave potential of 0.866 V versus reversible hydrogen electrode (vs. RHE) even superior to commercial Pt/C, which can be attributed to sufficient strain effect, local micro-electric field and the adsorption strength of oxygen-containing species in moderation. In addition, surface-enhanced Raman scattering (SERS) performances further supported the variation trend of surface composition. The enhancement factor (EF) of Au HSs can reach 3.8 × 105, further indicating its great potential as efficient SERS substrates for analysis and detection applications.
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