Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 39, Pages 46998-47009Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11101
Keywords
electrospinning; interface engineering; oxygen vacancy; heterostructure; oxygen evolution reaction
Funding
- National Natural Science Foundation of China [51973079, 51773075, 21673093, U1805234]
- Project of the Education Department of Jilin Province, China [JJKH20211047KJ]
- Natural Science Foundation of Fujian Province [2020J01147]
- Minjiang Scholar and Startup Fund for High-Level Talent at Fujian Normal University
- Program for Innovative Research Team in Science and Technology in Fujian Province University
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The study introduces a simple method to construct CeO2-CoO nanofibers as efficient OER electrocatalysts, exhibiting excellent catalytic performance and long-term stability. The unique interfacial architecture between CeO2 and CoO contributes to the outstanding OER properties of the nanofibers.
The development of highly efficient and cheap electrocatalysts for the oxygen evolution reaction (OER) is highly desirable in typical water-splitting electrolyzers to achieve renewable energy production, yet it still remains a huge challenge. Herein, we have presented a simple procedure to construct a new nanofibrous hybrid structure with the interface connecting the surface of CeO2 and CoO as a high-performance electrocatalyst toward the OER through an electrospinning-calcination-reduction process. The resultant CeO2-CoO nanofibers exhibit excellent electrocatalytic properties with a small overpotential of 296 mV at 10 mA cm(-2) for the OER, which is superior to many previously reported nonprecious metal-based and commercial RuO2 catalysts. Furthermore, the prepared CeO2-CoO nanofibers display remarkable long-term stability, which can be maintained for 130 h with nearly no attenuation of OER activity in an alkaline electrolyte. A combined experimental and theoretical investigation reveals that the excellent OER properties of CeO2-CoO nanofibers are due to the unique interfacial architecture between CeO2 and CoO, where abundant oxygen vacancies can be generated due to the incomplete matching of atomic positions of two parts, leading to the formation of many low-coordinated Co sites with high OER catalytic activity. This research provides a practical and promising opportunity for the application of heterostructured nonprecious metal oxide catalysts for high-efficiency electrochemical water oxidation.
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