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Title: A general approach for the direct fabrication of metal oxide-based electrocatalysts for efficient bifunctional oxygen electrodes

Here, we develop a simple one-pot synthetic strategy for the general preparation of nitrogen doped carbon supported metal/metal oxides (Co@CoO/NDC, Ni@NiO/NDC and MnO/NDC) derived from the complexing function of (ethylenediamine)tetraacetic acid (EDTA). EDTA serves not only as a resource to tune the morphology in terms of the complexation constant for M–EDTA, but also as a nitrogen and oxygen source for nitrogen doping and metal oxide formation, respectively. When the materials are used as electrocatalysts for the oxygen electrode reaction, Co@CoO/NDC-700 and MnO/NDC-700 show superior electrocatalytic activity towards the oxygen reduction reaction (ORR), while Co@CoO/NDC-700 and Ni@NiO/NDC-700 exhibit excellent oxygen evolution reaction (OER) activities. Taken together, the resultant Co@CoO/NDC-700 exhibits the best catalytic activity with favorable reaction kinetics and durability as a bi-functional catalyst for the ORR and OER, which is much better than the other two catalysts, Pt/C and Ir/C. Moreover, as an air electrode for a homemade zinc–air battery, Co@CoO/NDC-700 shows superior cell performance with a highest power density of 192.1 mW cm -2, the lowest charge–discharge overpotential and high charge–discharge durability over 100 h.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [3] ; ORCiD logo [1]
  1. Huazhong Univ. of Science and Technology, Wuhan (China). Ministry of Education, Key Lab. of Material Chemistry for Energy Conversion and Storage and Hubei Key Lab. of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering
  2. Tianjin Univ., Tianjing (China). School of Materials Science and Engineering
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Publication Date:
Report Number(s):
BNL-203447-2018-JAAM
Journal ID: ISSN 2398-4902; SEFUA7
Grant/Contract Number:
SC0012704; 21573083; NCET-13-0237; 2013TS136; 2014YQ009
Type:
Accepted Manuscript
Journal Name:
Sustainable Energy & Fuels
Additional Journal Information:
Journal Volume: 1; Journal Issue: 4; Journal ID: ISSN 2398-4902
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); National Natural Science Foundation of China (NNSFC); Program for New Century Excellent Talents in Universities of China (NCET); Fundamental Research Funds for the Central Univ. (China); Thousand Talents Program (China); Huazhong Univ. of Science and Technology, Wuhan (China)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; bifunctional oxygen electrodes
OSTI Identifier:
1431448