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Title: Oxygen Reduction on Gold Nanocrystal Surfaces in Alkaline Electrolyte: Evidence for Surface Proton Transfer Effects

Four-electron oxygen reduction reaction (4e-ORR) pathway, as a key high-performance reaction pathway in energy conversion, has been sought after in numerous investigations on metal surfaces over the last decades. Although the surfaces of the most noble metals, including platinum and palladium, demonstrate the fullpotential- range 4e-ORR, this is not the case, for gold (Au) surfaces. The 4e-ORR is only operative on Au surfaces with {100} subfacets, e.g. Au(100), in alkaline solution, however restricted to a certain potential region at low overpotentials, while reverting to a 2e-ORR at high overpotentials. This ORR on Au(100) has been a long-standing puzzle of electrocatalysis. Hereby we review the ORR studies on Au, along with the studies of water effects on Au catalysts, and present our electrochemical results with monofacet Au nanocrystals. Finally, combining with theoretical calculations we demonstrate that surface proton transfer from co-adsorbed water plays the key role in determining the ORR mechanism on Au surfaces in base.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States)
Publication Date:
Report Number(s):
BNL-203376-2018-JAAM
Journal ID: ISSN 1938--6737
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
ECS Transactions
Additional Journal Information:
Journal Volume: 85; Journal Issue: 12; Journal ID: ISSN 1938--6737
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1430856

Zhang, Yu, Lu, Fang, Liu, Shizhong, Lu, Deyu, Su, Dong, Liu, Mingzhao, Zhang, Yugang, Liu, Ping, Wang, Jia X., Adzic, Radoslav R., and Gang, Oleg. Oxygen Reduction on Gold Nanocrystal Surfaces in Alkaline Electrolyte: Evidence for Surface Proton Transfer Effects. United States: N. p., Web. doi:10.1149/08512.0093ecst.
Zhang, Yu, Lu, Fang, Liu, Shizhong, Lu, Deyu, Su, Dong, Liu, Mingzhao, Zhang, Yugang, Liu, Ping, Wang, Jia X., Adzic, Radoslav R., & Gang, Oleg. Oxygen Reduction on Gold Nanocrystal Surfaces in Alkaline Electrolyte: Evidence for Surface Proton Transfer Effects. United States. doi:10.1149/08512.0093ecst.
Zhang, Yu, Lu, Fang, Liu, Shizhong, Lu, Deyu, Su, Dong, Liu, Mingzhao, Zhang, Yugang, Liu, Ping, Wang, Jia X., Adzic, Radoslav R., and Gang, Oleg. 2018. "Oxygen Reduction on Gold Nanocrystal Surfaces in Alkaline Electrolyte: Evidence for Surface Proton Transfer Effects". United States. doi:10.1149/08512.0093ecst.
@article{osti_1430856,
title = {Oxygen Reduction on Gold Nanocrystal Surfaces in Alkaline Electrolyte: Evidence for Surface Proton Transfer Effects},
author = {Zhang, Yu and Lu, Fang and Liu, Shizhong and Lu, Deyu and Su, Dong and Liu, Mingzhao and Zhang, Yugang and Liu, Ping and Wang, Jia X. and Adzic, Radoslav R. and Gang, Oleg},
abstractNote = {Four-electron oxygen reduction reaction (4e-ORR) pathway, as a key high-performance reaction pathway in energy conversion, has been sought after in numerous investigations on metal surfaces over the last decades. Although the surfaces of the most noble metals, including platinum and palladium, demonstrate the fullpotential- range 4e-ORR, this is not the case, for gold (Au) surfaces. The 4e-ORR is only operative on Au surfaces with {100} subfacets, e.g. Au(100), in alkaline solution, however restricted to a certain potential region at low overpotentials, while reverting to a 2e-ORR at high overpotentials. This ORR on Au(100) has been a long-standing puzzle of electrocatalysis. Hereby we review the ORR studies on Au, along with the studies of water effects on Au catalysts, and present our electrochemical results with monofacet Au nanocrystals. Finally, combining with theoretical calculations we demonstrate that surface proton transfer from co-adsorbed water plays the key role in determining the ORR mechanism on Au surfaces in base.},
doi = {10.1149/08512.0093ecst},
journal = {ECS Transactions},
number = 12,
volume = 85,
place = {United States},
year = {2018},
month = {4}
}