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Article Abstract
Designing a non-noble metal based heterojunction electrocatalyst with outstanding catalytic activity and long-term stability is essential for efficient oxygen evolution reaction (OER). Herein, we have strategically designed a NiTe/CeO heterojunction based on a donor-acceptor approach, wherein CeO functions as the electron donor and NiTe as the electron acceptor. Kelvin probe force microscopy (KPFM) measurements revealed that the work functions of NiTe and CeO facilitate the charge transfers upon interfacial coupling between NiTe and CeO. This interfacial synergy induces the formation of a built-in electric field at the heterojunction, which effectively modulates the surface electronic structure of NiTe through strong interfacial interactions with CeO, achieving an overpotential of 263 mV at 10 mA cm and a Tafel slope of 81 mV dec for the OER. The formation of the heterojunction led to an increased electrochemical active surface area (a value of 10.5 μF cm) and a reduced charge-transfer resistance (1 Ω), which results in improved turnover frequency (3 s) as compared to the bare counterpart. Through the distribution of relaxation time (DRT) analysis, the extracted time constants corresponding to different relaxation processes reveal an enhanced charge-transfer kinetics across the interfaces, enhancing OER kinetics.
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| http://dx.doi.org/10.1021/acsami.5c12080 | DOI Listing |
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