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Title: In situ precise tuning of bimetallic electronic effect for boosting oxygen reduction catalysis
Authors: Zhang, Junming
Xu, Weichang
Liu, Yuan
Hung, Sung-Fu
Liu, Wei
Lam, Zhenhui
Tao, Hua Bing
Yang, Hongbin
Cai, Weizheng
Xiao, Hai
Chen, Hongyu
Liu, Bin
Keywords: Engineering::Chemical engineering
Issue Date: 2021
Source: Zhang, J., Xu, W., Liu, Y., Hung, S., Liu, W., Lam, Z., Tao, H. B., Yang, H., Cai, W., Xiao, H., Chen, H. & Liu, B. (2021). In situ precise tuning of bimetallic electronic effect for boosting oxygen reduction catalysis. Nano Letters, 21(18), 7753-7760.
Project: RG4/20
Journal: Nano Letters
Abstract: Tuning intermediate adsorption energy by shifting the d-band center offers a powerful strategy to tailor the reactivity of metal catalysts. Here we report a potential sweep method to grow Pd layer-by-layer on Au with the capability to in situ measure the surface structure through an ethanol oxidation reaction. Spectroscopic characterizations reveal charge-transfer induced valence band restructuring in the Pd overlayer, which shifts the d-band center away from the Fermi level compared to bulk Pd. Precise overlayer control gives the optimal bimetallic surface of two monolayers (ML) Pd on Au, which exhibits more than 370-fold mass activity enhancement in oxygen reduction reaction (at 0.9 V vs. reversible hydrogen electrode) and 40 mV increase in half-wave potential compared to the Pt/C. Tested in a homemade Zn-air battery, the 2-ML-Pd/Au/C exhibits a maximum power density of 296 mW/cm2 and specific activity of 804 mAh/gZn, much higher than Pt/C with the same catalyst loading amount.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.1c02705
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Nanyang Environment and Water Research Institute 
Rights: © 2021 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:IGS Journal Articles
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