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Title: Oxygen Reduction at Very Low Overpotential on Nanoporous Ag Catalysts

Here we report a monolithic nanoporous Ag (np-Ag) material, synthesized using the dealloying method, as high-performance catalysts for ORR in alkaline media. As shown in Scheme 1, when there is insufficient potential input, the O2 molecules are more likely to rebound off from a planar electrode surface (i.e. bulk polycrystalline metal, films made from nanoparticles or nanowires) before they could be reduced. In contrast, they are more likely to be trapped inside the monolithic nanoporous structure, contacting with catalytic surface for multiple time, which greatly enhances the chance for them to be fully reduced. As a result, the np-Ag catalyst is able to achieve an equivalent or better ORR performance than the state-of the-art Pt/C catalyst at low overpotentials, which is most desired in electrochemical energy applications for maximizing efficiency.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [3] ;  [5] ;  [1] ;  [3]
  1. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy
  2. Columbia Univ., New York, NY (United States). Dept. of Chemical Engineering; Univ. of Delaware, Newark, DE (United States). Dept. of Chemical and Biomolecular Engineering
  3. Univ. of Delaware, Newark, DE (United States). Dept. of Chemical and Biomolecular Engineering
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.
  5. Columbia Univ., New York, NY (United States). Dept. of Chemical Engineering; Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.
Publication Date:
OSTI Identifier:
1214526
Report Number(s):
BNL--108336-2015-JA
Journal ID: ISSN 1614-6832; KC0302010
Grant/Contract Number:
DE-SC00112704
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 5; Journal Issue: 13; Journal ID: ISSN 1614-6832
Publisher:
Wiley
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