2017
DOI: 10.1021/acscatal.7b02313
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Boosting the Electrocatalytic Activity of Co3O4 Nanosheets for a Li-O2 Battery through Modulating Inner Oxygen Vacancy and Exterior Co3+/Co2+ Ratio

Abstract: Rechargeable Li-O2 batteries have been considered as the most promising chemical power owing to their ultrahigh specific energy density. But the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) result in the high overpotential (~1.5V), the poor rate capability and even the short cycle life, which critically hinder their practical applications. Herein, we propose a synergistic strategy to boost the electrocatalytic activity of Co3O4 nanosheets for Li-O2 battery by tuning the inner ox… Show more

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Cited by 265 publications
(167 citation statements)
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“…[8] As imilars trong band at 198 cm À1 is observed in Table S2 in the Supporting Information). Upon increasing the temperature, the Zn/Co ratio gradually decreases, which indicates ah igh degree of volatilization of nanosizedZ na th igher temperature;t his is also consistent with TXRF results ( Table S1 in [8,52] The O A /O L ratio increases with the introduction of Zn, the linear sweep voltammetry (LSV) curves, for which 50 mA cm À2 was chosen as an indicator due to the rapid rising current for the oxidation of Co 3 + to Co 4 + at about 1.5 V. [21] /NC-CNT-X could play more criticalr oles in activation of the catalytic sites by decreasingt he adsorption energy of H 2 Om olecules onto the active sites, andt hus, leading to an increasei nt he OER activity. [54,56] DFT calculations have suggestedt hat the existence of oxygen vacancies could decrease the hindrance of the adsorption of H 2 O/OH À at low-coordination Co 3 + sites.…”
Section: Resultssupporting
confidence: 68%
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“…[8] As imilars trong band at 198 cm À1 is observed in Table S2 in the Supporting Information). Upon increasing the temperature, the Zn/Co ratio gradually decreases, which indicates ah igh degree of volatilization of nanosizedZ na th igher temperature;t his is also consistent with TXRF results ( Table S1 in [8,52] The O A /O L ratio increases with the introduction of Zn, the linear sweep voltammetry (LSV) curves, for which 50 mA cm À2 was chosen as an indicator due to the rapid rising current for the oxidation of Co 3 + to Co 4 + at about 1.5 V. [21] /NC-CNT-X could play more criticalr oles in activation of the catalytic sites by decreasingt he adsorption energy of H 2 Om olecules onto the active sites, andt hus, leading to an increasei nt he OER activity. [54,56] DFT calculations have suggestedt hat the existence of oxygen vacancies could decrease the hindrance of the adsorption of H 2 O/OH À at low-coordination Co 3 + sites.…”
Section: Resultssupporting
confidence: 68%
“…The HR N 1 s XPS results can be deconvoluted into three peaks located at 398.7, 399.8, and 401.6 eV (Figure S6 D in the Supporting Information), which can be assigned to pyridinic N, pyrrolic N, and quaternary N, respectively. The O 1 s spectrum (Figure S6 E in the Supporting Information) displays two oxygen states at around 529.9 and 531.5 eV, which are related to lattice oxygen bound to metals (O L ) and oxygen vacancies on the surface (O A ) . The O A /O L ratio increases with the introduction of Zn, which indicates a higher concentration of vacancies.…”
Section: Resultsmentioning
confidence: 99%
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“…[49,54] Recently,C o 3 O 4 has been extensivelys tudied and applieda s the cathode catalysti nL i-O 2 battery due to its excellent catalytic activity in non-aqueous electrolyte. [23,35,55] As can be known from the above-mentionedr esultso fT GA/DSC, ZIF-Co 3 O 4 /NCF has ah igh content of Co 3 O 4 .T herefore, in this work, the combination of Co 3 O 4 and N-doped carbon fibre enable the composite catalyst to work in both aqueous and non-aqueous solution.T he ORR activity of ZIF-Co 3 O 4 /NCF in non-aqueous electrolyte was confirmed by performing steadystate staircase voltammetry measurement in O 2 -saturated 0.1 m LiPF 6 in 1,2-dimethoxyethane. As shown in Figure S11, no plateau can be achieved at the low potentialr ange for the both catalysts, which is differentf rom the polarizations in the aqueous electrolyte.…”
Section: Resultsmentioning
confidence: 70%
“…Besides, it is effective strategy to enhance the electrocatalytic activity of cobalt oxide catalysts by adjusting the exterior Co 3+ /Co 2+ ratio. Liu et al . boosted the electrocatalytic activity of Co 3 O 4 nanosheets through modulating inner oxygen vacancy and exterior Co 3+ /Co 2+ ratio, which had been identified by Raman spectroscopy, X‐ray photoelectron spectroscopy, and X‐ray absorption near edge structure spectroscopy.…”
Section: Cobalt Oxide/chalcogenidesmentioning
confidence: 99%