1. Constructing built-in electric field in oxygen vacancies-enriched Fe3O4-FeSe2 heterojunctions supported on reduced graphene oxide for efficient overall water splitting.
- Author
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Sun, Aowei, Qiu, Yanling, Chen, Kuiyong, Xu, Hezeng, and Liu, Jingquan
- Subjects
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IRON oxides , *ELECTRIC fields , *FERMI level , *OXYGEN in water , *HETEROSTRUCTURES - Abstract
[Display omitted] Combining interfacial oxygen vacancy engineering with a built-in electric field (BEF) technique is an efficient way to build efficient and practical electrocatalytic water-splitting catalysts. In this study, a Fe 3 O 4 -FeSe 2 heterojunction catalyst with oxygen vacancies supported on reduced graphene oxide (rGO) was designed and successfully fabricated using a simple two-step hydrothermal method. Owing to the different Fermi levels of Fe 3 O 4 and FeSe 2 , a BEF was generated at the interface, which enhanced the separation of negative and positive charges, thus optimizing the adsorption of hydrogen/oxygen intermediates on the heterostructures and improving the activity of the catalyst. Experimental results show that Fe 3 O 4 -FeSe 2 /rGO/NF exhibits excellent hydrogen and oxygen evolution performances, with low overpotentials of 234/300 mV at 100 mA⋅cm−2. A water electrolyzer assembled with Fe 3 O 4 -FeSe 2 /rGO/NF as both the anode and cathode requires only a small potential of 1.78 V to reach a current density of 100 mA⋅cm−1. This study provides an innovative approach for constructing a catalyst with excellent electrocatalytic performance for overall water splitting. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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