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Title: Enhancement of oxygen reduction reaction activities by Pt nanoclusters decorated on ordered mesoporous porphyrinic carbons

The high cost of Pt-based membrane electrode assemblies (MEAs) is a critical hurdle for the commercialization of polymer electrolyte fuel cells (PEFCs). Recently, non-precious metal-based catalysts (NPMCs) have demonstrated much enhanced activity but their oxygen reduction reaction (ORR) activity is still inferior to that of Pt-based catalysts resulting in a much thicker electrode in the MEA. For the reduction of mass transport and ohmic overpotential we adopted a new concept of catalyst that combines an ultra-low amount of Pt nanoclusters with metal–nitrogen (M–Nx) doped ordered mesoporous porphyrinic carbon (FeCo–OMPC(L)). The 5 wt% Pt/FeCo–OMPC(L) showed a 2-fold enhancement in activities compared to a higher loading of Pt. Our experimental results supported by first-principles calculations indicate that a trace amount of Pt nanoclusters on FeCo–OMPC(L) significantly enhances the ORR activity due to their electronic effect as well as geometric effect from the reduced active sites. Finally, in terms of fuel cell commercialization, this class of catalysts is a promising candidate due to the limited use of Pt in the MEA.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [6] ;  [6] ;  [3]
  1. SABIC Technology Center, Riyadh (Saudi Arabia)
  2. Pohang Accelerator Lab. (PAL) (Korea, Republic of)
  3. Korea Inst. of Energy Research (KIER), Daejeon (South Korea). Fuel Cell Lab.
  4. Ulsan National Inst. of Science and Technology (UNIST), Ulsan (South Korea). Dept. of Chemistry
  5. Ulsan National Inst. of Science and Technology (UNIST), Ulsan (South Korea). Dept. of Chemistry; Ulsan National Inst. of Science and Technology (UNIST), Ulsan (South Korea). School of Engineering
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
Publication Date:
OSTI Identifier:
1302999
Report Number(s):
BNL--112405-2016-JA
Journal ID: ISSN 2050-7488; R&D Project: MA510MAEA; KC0302010
Grant/Contract Number:
SC00112704; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 4; Journal Issue: 16; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
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; 36 MATERIALS SCIENCE