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Title: Janus Nanocages of Platinum-Group Metals and Their Use as Effective Dual-Electrocatalysts

Journal Article · · Angewandte Chemie (International Edition)
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [3];  [4]; ORCiD logo [2]; ORCiD logo [5]
  1. Georgia Institute of Technology, Atlanta, GA (United States); Emory Univ., Atlanta, GA (United States); Nanjing Tech Univ. (China); Jiangnan Univ., Wuxi, Jiangsu (China)
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Georgia Institute of Technology, Atlanta, GA (United States)
  4. Nanjing Tech Univ. (China)
  5. Georgia Institute of Technology, Atlanta, GA (United States); Emory Univ., Atlanta, GA (United States)

Janus nanocages with distinctive platinum-group metals on the outer and inner surfaces can naturally catalyze at least two different reactions. In this work, we report a general method based on successive deposition and then selective etching for the facile synthesis of such nanocages. Herein, we have fabricated 11 different types of Janus nanocages characterized by a uniform size and well-defined {100} facets, together with porous, ultrathin, asymmetric walls up to 1.6 nm thick. When tested as dual-electrocatalysts toward oxygen reduction and evolution reactions, the Janus nanocages based on Pt and Ir exhibited superior activities depending on the thickness and relative position of the metal layer. Density functional theory studies suggest that the alloy composition and surface structure of the nanocages both play important roles in enhancing the electrocatalytic activities by modulating the stability of key reaction intermediates.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER15731; AC02-05CH11231
OSTI ID:
1835125
Journal Information:
Angewandte Chemie (International Edition), Vol. 60, Issue 18; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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