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Title: Boosting the Oxygen Reduction Performance via Tuning the Synergy between Metal Core and Oxide Shell of Metal−Organic Frameworks‐Derived Co@CoO x

Journal Article · · ChemElectroChem
ORCiD logo [1];  [2];  [1];  [3];  [4];  [2];  [2];  [2];  [2];  [1]; ORCiD logo [1]
  1. College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 P.R. China
  2. X-Ray Science Division, Advanced Photon Source Argonne National Laboratory Lemont, Illinois 60439 USA
  3. Center of Nanoscale Materials Argonne National Laboratory Lemont, Illinois 60439 USA
  4. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou University Changzhou 213164 P.R. China

Abstract Co core@Co oxide shell (Co@CoO x ) catalysts represent a large family with promising oxygen reduction reaction (ORR) catalytic activity. However, inadequate understanding of Co@CoO x synergy prohibits further pursuit of catalytic performance enhancement. Herein, a Co zeolitic−imidazolate framework was converted into metallic Co, followed by controlled air treatment to form Co@CoO x . The composition and structure evolution as a function of air treatment temperature were studied thoroughly through conventional and synchrotron (both ex‐situ and in‐situ) characterizations, confirming the coexistence of CoO and Co 3 O 4 in the shell. The optimal catalyst showed an ORR half‐wave potential of 0.87 V (vs. RHE) in an alkaline half‐cell and delivered high discharge capacity in an aprotic Li−O 2 battery (7,124 mAh g Cat+C −1 ) and an aqueous Zn−air battery (694 mAh g Zn −1 ) with good performance retention after durability test. Modeling simulation and density functional theory calculation confirmed the charge donation from metal core to oxide shell and shed light on new insights of how metal@metal oxide synergy impacted the ORR via tuning the charge conductivity, oxygen affinity and intermediate transfer pathway. This work opens up a venue to boost ORR catalytic activity from an interfacial synergy perspective.

Sponsoring Organization:
USDOE
OSTI ID:
1604104
Journal Information:
ChemElectroChem, Journal Name: ChemElectroChem Vol. 7 Journal Issue: 7; ISSN 2196-0216
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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