Cited 3 time in webofscience Cited 4 time in scopus

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co-N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

Title
Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co-N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability
Authors
Tran, Thanh NhanLee, Ha-YoungPark, Jong-DeokKang, Tong-HyunLee, Byong-JuneYu, Jong-Sung
DGIST Authors
Tran, Thanh Nhan; Lee, Ha-Young; Park, Jong-Deok; Kang, Tong-Hyun; Lee, Byong-June; Yu, Jong-Sung
Issue Date
2020-07
Citation
ACS Applied Energy Materials, 3(7), 6310-6322
Type
Article
Article Type
Article
Author Keywords
2D carbonplatinumcobalt-nitrogen-doped carbonoxygen reduction reactionfuel cellelectrocatalysis
Keywords
FUEL-CELLNITROGENFENANOPARTICLESGRAPHENEPLATINUMEVOLUTIONMETAL-ORGANIC FRAMEWORKSELECTROCATALYTIC ACTIVITYHIGH-PERFORMANCE
ISSN
2574-0962
Abstract
Herein, an oxygen reduction reaction (ORR) catalyst consisting of CoN-decorated Pt nanoparticles (NPs) on thin two-dimensional (2D) nanosheet-structured Co-N-doped porous carbon is prepared by utilizing the pyrolyzed nanosheet-shaped Co-based metal-organic framework as a template for Pt deposition. After Pt deposition and acid leaching, the remaining Co species on the Pt surface are converted to CoN species by ammonia heat treatment, which are also attached on the Pt surface. The as-synthesized CoN-decorated Pt on the Co-N-functionalized 2D carbon (CoN-Pt/CoNC-2D) displays an excellent ORR activity, better than a commercial Pt/C in half-cell and single-cell tests, and also exhibits remarkable long-term durability with only a ∼17 mV shift in half-wave potential after 30 000 potential cycles. Such excellent ORR catalytic performance is attributed to strong cooperative synergistic interactions between the CoN-Pt and CoNC-2D in the catalyst. The CoN species formed on the Pt surface not only change the Pt electronic structure by down-shifting the Pt d-band center but also passivate the Pt surface to prevent Pt oxidation and dissolution during the ORR. On the other hand, the thin porous CoNC-2D nanoflake support significantly improves the accessibility of reactants to enhance mass transfer and prevents segregation and agglomeration of CoN-Pt NPs during the ORR through strong metal-support interaction, further enhancing ORR activity and durability of the CoN-Pt/CoNC-2D catalyst. © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/12395
DOI
10.1021/acsaem.0c00520
Publisher
American Chemical Society
Related Researcher
  • Author Yu, Jong-Sung Light, Salts and Water Research Group
  • Research Interests Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
Files:
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Collection:
Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles


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