Abstract
W doped SnO2 anodes are shown to exhibit a super-high oxygen evolution potential (OEP) of 2.5 V (vs SHE) based on Density Functional Theory (DFT). Calculation of the free energy of oxygen evolution reactions (OER) provided a deep understanding of the mechanism for such high OEP. Typical four-step associative process was used to investigate the OER on (110) surface of W doped SnO2. The analysis of OER indicated that the free energy difference ΔG4 of the third proton-transfer on the (110) W–SnO2 with W on the surface layer contributed to the super-high oxygen evolution potential. Cyclic voltammetric measurements on W doped SnO2 prepared on Ti substrates showed an OEP of 2.6 V (vs SHE) in good agreement with the calculations.
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