2022
DOI: 10.1002/adfm.202210010
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Systematic Modification of MoO3‐Based Cathode by the Intercalation Engineering for High‐Performance Aqueous Zinc‐Ion Batteries

Abstract: Aqueous Zn-ion batteries are attracting extensive attention, but their largescale application is prevented by the poor electrochemical kinetics and terrible lifespan. Herein, a strategy of introducing the conductive poly(3,4ethylenedioxythiophene) (PEDOT) into the interlayers of α-MoO 3 is reported to systematically overcome the above shortcomings. Through data analyses of the cyclic coltammetry, electrochemical impedance spectroscopy, and galvanostatic intermittent titration technique, the electrochemical kin… Show more

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Cited by 27 publications
(16 citation statements)
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“…The CV curves of the Zn//MoO 3 @Mn 3 O 4 ZiB coin cell were recorded based on the SNZN 2 optimized electrolyte at different scan rates in between a 0.4 and 2.3 V (Zn 2+ /Zn) working potential (Figure a). Three pairs of redox peaks arise at different scan rates due to the multiple redox conversion of Mo and Mn oxides accompanied by the insertion/extraction of Zn 2+ cations (Mo 6+ ↔ Mo 5+ ↔ Mo 4+ and Mn 4+ ↔ Mn 3+ ↔ Mn 2+ ). ,,,,,, The redox peaks were almost restraining their position with increasing from a 0.2 to 1 mV s –1 scan rate, indicating the reversible coinsertion/extraction of H + /Zn 2+ ions from the cathode material in a hydrated eutectic electrolyte. ,,, The logarithmic relationship between scan rate (v) and peak current (i) was linearly fitted to obtain the diffusive and capacitive controlled current using the power law equation (i = av b ) where a and b are the adjustable parameters. The slopes (b values) of the anodic and cathodic peaks were found to be 0.74 (P1), 0.53 (P2), 0.69 (P3), 0.68 (P4), 0.69 (P5), and 0.73 (P6), signifying the insertion/extraction of H + /Zn 2+ ions into/from the MoO 3 @Mn 3 O 4 cathode was a diffusion-controlled process (Figure b). ,, …”
Section: Resultsmentioning
confidence: 98%
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“…The CV curves of the Zn//MoO 3 @Mn 3 O 4 ZiB coin cell were recorded based on the SNZN 2 optimized electrolyte at different scan rates in between a 0.4 and 2.3 V (Zn 2+ /Zn) working potential (Figure a). Three pairs of redox peaks arise at different scan rates due to the multiple redox conversion of Mo and Mn oxides accompanied by the insertion/extraction of Zn 2+ cations (Mo 6+ ↔ Mo 5+ ↔ Mo 4+ and Mn 4+ ↔ Mn 3+ ↔ Mn 2+ ). ,,,,,, The redox peaks were almost restraining their position with increasing from a 0.2 to 1 mV s –1 scan rate, indicating the reversible coinsertion/extraction of H + /Zn 2+ ions from the cathode material in a hydrated eutectic electrolyte. ,,, The logarithmic relationship between scan rate (v) and peak current (i) was linearly fitted to obtain the diffusive and capacitive controlled current using the power law equation (i = av b ) where a and b are the adjustable parameters. The slopes (b values) of the anodic and cathodic peaks were found to be 0.74 (P1), 0.53 (P2), 0.69 (P3), 0.68 (P4), 0.69 (P5), and 0.73 (P6), signifying the insertion/extraction of H + /Zn 2+ ions into/from the MoO 3 @Mn 3 O 4 cathode was a diffusion-controlled process (Figure b). ,, …”
Section: Resultsmentioning
confidence: 98%
“…The Raman vibrational modes were centered at 129, 160, 247, 291, 340, 382, 670, 823, and 995 cm –1 corresponding to the α-MoO 3 phase. The 315, 361, and 646 cm –1 Raman vibrational modes were ascribed to the Mn 3 O 4 phase. , …”
Section: Resultsmentioning
confidence: 98%
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