2021
DOI: 10.1021/acsenergylett.0c02359
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Extensive Active-Site Formation in Trirutile CoSb2O6 by Oxygen Vacancy for Oxygen Evolution Reaction in Anion Exchange Membrane Water Splitting

Abstract: Experiment methods with calculation method, SEM/ TEM images, XRD patterns, ESR spectra, iR-uncompensated CV, EIS, TOFs at various overpotentials, Raman and XPS spectra after experiment, XAS spectra of Co reference materials with linear correlation curve, and iR-compensated AEMS performance (PDF)■ AUTHOR INFORMATION

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Cited by 88 publications
(76 citation statements)
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“…The abundant oxygen vacancies created by quenching will regulate the electronic structure and surface properties of the NiMoO 4 NRs, thus increasing the availability of active sites for OER. 39 The Fe 2p spectrum of NiMoO 4 NRs-Fe-1 indicates the coexistence of Fe 3+ (712.6 and 726.8 eV) and Fe 2+ (707.1 and 722.5 eV), 40 as shown in Figure 2c. The binding energies of the Fe 2+ peaks in NiMoO 4 NRs-Fe-1 are around 2 eV lower than those observed for Fe 2+ in FeO, suggesting that the Fe 2+ sites in NiMoO 4 NRs-Fe-1 likely existed in the vicinity of oxygen vacancies.…”
Section: Resultsmentioning
confidence: 92%
“…The abundant oxygen vacancies created by quenching will regulate the electronic structure and surface properties of the NiMoO 4 NRs, thus increasing the availability of active sites for OER. 39 The Fe 2p spectrum of NiMoO 4 NRs-Fe-1 indicates the coexistence of Fe 3+ (712.6 and 726.8 eV) and Fe 2+ (707.1 and 722.5 eV), 40 as shown in Figure 2c. The binding energies of the Fe 2+ peaks in NiMoO 4 NRs-Fe-1 are around 2 eV lower than those observed for Fe 2+ in FeO, suggesting that the Fe 2+ sites in NiMoO 4 NRs-Fe-1 likely existed in the vicinity of oxygen vacancies.…”
Section: Resultsmentioning
confidence: 92%
“…Reproduced with permission. [ 256 ] Copyright 2021, American Chemical Society. Slices of the distribution of exchange/polarized charges of F) NNTM or G) N atoms in NNTM@BCN1.…”
Section: Merits Of S‐ P‐ and F‐block Metals In Water Electrolysismentioning
confidence: 99%
“…[ 244–255 ] For instance, Lee and co‐workers reported the trirutile CoSb 2 O 6 with octahedral Co 2+ sites and inactive Sb 5+ ions as an OER electro(pre)catalyst in the alkaline media. [ 256 ] In situ XAS results showed that the oxygen vacancy in CoSb 2 O 6 improved the OH − adsorption kinetics by tuning the low oxophilicity of the Co atom, and it facilitated the further complete oxidation of Co 3+ to the real active Co 4+ site for OER, that is, reaching an overall higher oxidation state of Co than in spinel‐type Co 3 O 4 (Figure 9D,E).…”
Section: Merits Of S‐ P‐ and F‐block Metals In Water Electrolysismentioning
confidence: 99%
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“…[ 24 ] Moreover, Zhou et al [ 25 ] observed that the Co valence and spin states in Li 2 Co 2 O 4 spinel oxide (pure Co 3+ in LS state) can transform into Co 3.4+ in the LS state under OER voltages by using operando soft X‐ray absorption spectroscopy. Recently, Ham et al [ 26 ] reported that the octahedral Co 2+ ions in CoSb 2 O 6 trirutile would be oxidized to Co 3+ ions and further to Co 4+ ions under OER conditions. The structural/electronic structural variations of OER electrocatalysts during/after the OER will change the material e g occupancy, orbital state, charge‐transfer energy value, and many other physicochemical properties.…”
Section: Brief Historymentioning
confidence: 99%