Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 21, Pages 17950-17957Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b04699
Keywords
electrospinning; CeO2/Co3O4 heterostructure; N-doped carbon nanofibers; oxygen evolution reaction; synergistic effects
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Funding
- National Natural Science Foundation of China [21875112, 21878047, 21676056, 51673040]
- Six Talents Pinnacle Program of Jiangsu Province of China [JNHB-006]
- Cling Lan Project of Jiangsu Province [1107040167]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [1107047002]
- Fundamental Research Funds for the Central Universities [2242019K40137]
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Exploring highly efficient and cost-effective electrocatalysts with more feasible synthesis strategies toward oxygen evolution reaction (OER) is highly desirable for a broad range of advanced sustainable energy conversion systems. Herein, we develop a feasible electrospinning strategy for the facile fabrication of a Co3O4/CeO2 heterostructure in situ embedded in N-doped carbon nanofibers (h-Co3O4/CeO2@N-CNEs) as a high-performance electrocatalyst for the OER Unlike previously reported Co3O4/CeO2 composites, the as-prepared Co3O4/CeO2 heterostructure presents hollow and porous features. The nanopores can develop within Co3O4/CeO2 nanocrystals with an analogous mechanism to void formation in the Kirkendall effect. Electrochemical measurements demonstrate that h-Co3O4/CeO2@N-CNFs can enable high OER activity with a low overpotential of 310 mV to achieve 10 mA cm(-2) current density and good stability that can maintain 40 000 s without perceptible attenuation, outperforming those of the commercial RuO2 catalyst. The outstanding OER performance originates from the important synergies by combining hollow Co3O4/CeO2 heterostructures and three-dimensional porous N-CNF networks.
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