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Kim, Kwang S.
Center for Superfunctional Materials (CSM)
Research Interests
  • Theoretical/experimental nanosciences, molecular electronics spectroscopy, energy materials

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Multi-site catalyst derived from Cr atoms-substituted CoFe nanoparticles for high-performance oxygen evolution activity

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Title
Multi-site catalyst derived from Cr atoms-substituted CoFe nanoparticles for high-performance oxygen evolution activity
Author
Dang, Ngoc K.Tiwari, Jitendra N.Sultan, SirajMeena, AbhishekKim, Kwang S.
Issue Date
2021-01
Publisher
ELSEVIER SCIENCE SA
Citation
CHEMICAL ENGINEERING JOURNAL, v.404, pp.126513
Abstract
Developing high-performance, stable and low-cost oxygen evolution reaction (OER) catalysts are pivotal for electrochemical water splitting and rechargeable metal-air batteries. In this work, we report an OER catalyst comprising Cr-CoFe, CoFe, Co5.47N and Fe3O4 sites embedded in nitrogen-doped graphene (denoted as CCF-1) that operates remarkably in alkaline water. This catalyst requires only 210/290 mV overpotential to generate current densities of 10/500 mA cm(-2) with small Tafel slope (39.1 mV dec(-1)) which is much better than the state-of-the-art IrO2 catalyst (310 mV @10 mAcm(-2) with Tafel slope of 74.8 mV dec(-1)). This striking OER performance is ascribed to substituted Cr atoms in the host matrix which modulated the geometric site/electronic structure of the catalyst and brings the optimal binding energies for oxygen intermediate with increased charge/mass transfer process for the fast kinetics of the OER reactions. Furthermore, CCF-1 demonstrated excellent OER durability which maintains the stable performance during the 200 h chronoamperometry test in 1 M KOH solution. The high stability of CCF-1 is attributed to the physicochemical protection effect of N doped graphitic layers which prevents the alloy nanoparticles from dissolution/re-deposition and aggregation during the prolonged OER operation.
URI
https://scholarworks.unist.ac.kr/handle/201301/50044
URL
https://www.sciencedirect.com/science/article/pii/S1385894720326413?via%3Dihub
DOI
10.1016/j.cej.2020.126513
ISSN
1385-8947
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CHM_Journal Papers
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