High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors

Guanyu Qiu; Zhiqiang Zhang; Emmanuel Pameté; Yunbing He; Xuexue Pan; Ming Chen; Shixiong Luo; Zhazira Supiyeva; Qamar Abbas; Xinman Chen

doi:10.1016/j.electacta.2023.142467

High capacity Mo₇S₈ nanosheets with electrodeposited alpha-Co(OH)₂ thin layer as positive electrode in hybrid potassium dual-ion supercapacitors

Guanyu Qiu, Zhiqiang Zhang, Emmanuel Pameté, Yunbing He^*, Xuexue Pan^*, Ming Chen, Shixiong Luo, Zhazira Supiyeva, Qamar Abbas, Xinman Chen

^*Corresponding author for this work

Institute for Chemistry and Technology of Materials (6380)

Research output: Contribution to journal › Article › peer-review

Abstract

Alpha-Co(OH)₂ nanoflakes are grown on Mo₇S₈ electrodes by galvanostatic electrodeposition. The influence of various electrodeposition time durations on the electrochemical properties of alpha-Co(OH)₂@Mo₇S₈ electrodes is compared. When the optimized deposition time is 1440 s, alpha-Co(OH)₂@Mo₇S₈ composite electrode obtains the highest specific capacity of 484.8 C g⁻¹, the lowest internal resistance of 1.96 Ω, the shortest time constant of 2.15 s, and the maximum diffusion coefficient of 2.27 × 10⁻¹⁴ cm² s⁻¹. The kinetic analysis of this electrode reveals the highest diffusion and the lowest non-diffusion contributions of 76.25% and 23.75% at 0.5 mV s⁻¹, respectively. Ex-situ X-ray photoelectron spectroscopy shows that chemical valences of Mo and Co increased from +2 to +4 and from +2 to +3 after OH⁻ insertion, respectively. The hybrid potassium dual-ion supercapacitor is assembled with alpha-Co(OH)₂@Mo₇S₈ cathode (positive electrode) and molybdenum-phosphate-based MoPO@Mo₇S₈ anode (negative electrode). The device exhibits remarkable capacitance characteristics with a high specific energy of 59.4 Wh kg⁻¹ at a specific power of 734 W kg⁻¹ and a capacity-maintaining retention rate of 97.3% after 10,000 charge–discharge cycles.

Original language	English
Article number	142467
Journal	Electrochimica Acta
Volume	458
DOIs	https://doi.org/10.1016/j.electacta.2023.142467
Publication status	Published - 1 Aug 2023

Keywords

Alalpha-Co(OH)@MoS nanocomposite
Electrodeposition
Potassium dual-ion supercapacitors
Specific energy
Storage mechanism

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

Access to Document

10.1016/j.electacta.2023.142467

Cite this

@article{5443d669aa804a2fabfdfe4d6996ba43,

title = "High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors",

abstract = "Alpha-Co(OH)2 nanoflakes are grown on Mo7S8 electrodes by galvanostatic electrodeposition. The influence of various electrodeposition time durations on the electrochemical properties of alpha-Co(OH)2@Mo7S8 electrodes is compared. When the optimized deposition time is 1440 s, alpha-Co(OH)2@Mo7S8 composite electrode obtains the highest specific capacity of 484.8 C g−1, the lowest internal resistance of 1.96 Ω, the shortest time constant of 2.15 s, and the maximum diffusion coefficient of 2.27 × 10−14 cm2 s−1. The kinetic analysis of this electrode reveals the highest diffusion and the lowest non-diffusion contributions of 76.25% and 23.75% at 0.5 mV s−1, respectively. Ex-situ X-ray photoelectron spectroscopy shows that chemical valences of Mo and Co increased from +2 to +4 and from +2 to +3 after OH− insertion, respectively. The hybrid potassium dual-ion supercapacitor is assembled with alpha-Co(OH)2@Mo7S8 cathode (positive electrode) and molybdenum-phosphate-based MoPO@Mo7S8 anode (negative electrode). The device exhibits remarkable capacitance characteristics with a high specific energy of 59.4 Wh kg−1 at a specific power of 734 W kg−1 and a capacity-maintaining retention rate of 97.3% after 10,000 charge–discharge cycles.",

keywords = "Alalpha-Co(OH)@MoS nanocomposite, Electrodeposition, Potassium dual-ion supercapacitors, Specific energy, Storage mechanism",

author = "Guanyu Qiu and Zhiqiang Zhang and Emmanuel Pamet{\'e} and Yunbing He and Xuexue Pan and Ming Chen and Shixiong Luo and Zhazira Supiyeva and Qamar Abbas and Xinman Chen",

note = "Publisher Copyright: {\textcopyright} 2023",

year = "2023",

month = aug,

day = "1",

doi = "10.1016/j.electacta.2023.142467",

language = "English",

volume = "458",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors

AU - Qiu, Guanyu

AU - Zhang, Zhiqiang

AU - Pameté, Emmanuel

AU - He, Yunbing

AU - Pan, Xuexue

AU - Chen, Ming

AU - Luo, Shixiong

AU - Supiyeva, Zhazira

AU - Abbas, Qamar

AU - Chen, Xinman

PY - 2023/8/1

Y1 - 2023/8/1

N2 - Alpha-Co(OH)2 nanoflakes are grown on Mo7S8 electrodes by galvanostatic electrodeposition. The influence of various electrodeposition time durations on the electrochemical properties of alpha-Co(OH)2@Mo7S8 electrodes is compared. When the optimized deposition time is 1440 s, alpha-Co(OH)2@Mo7S8 composite electrode obtains the highest specific capacity of 484.8 C g−1, the lowest internal resistance of 1.96 Ω, the shortest time constant of 2.15 s, and the maximum diffusion coefficient of 2.27 × 10−14 cm2 s−1. The kinetic analysis of this electrode reveals the highest diffusion and the lowest non-diffusion contributions of 76.25% and 23.75% at 0.5 mV s−1, respectively. Ex-situ X-ray photoelectron spectroscopy shows that chemical valences of Mo and Co increased from +2 to +4 and from +2 to +3 after OH− insertion, respectively. The hybrid potassium dual-ion supercapacitor is assembled with alpha-Co(OH)2@Mo7S8 cathode (positive electrode) and molybdenum-phosphate-based MoPO@Mo7S8 anode (negative electrode). The device exhibits remarkable capacitance characteristics with a high specific energy of 59.4 Wh kg−1 at a specific power of 734 W kg−1 and a capacity-maintaining retention rate of 97.3% after 10,000 charge–discharge cycles.

AB - Alpha-Co(OH)2 nanoflakes are grown on Mo7S8 electrodes by galvanostatic electrodeposition. The influence of various electrodeposition time durations on the electrochemical properties of alpha-Co(OH)2@Mo7S8 electrodes is compared. When the optimized deposition time is 1440 s, alpha-Co(OH)2@Mo7S8 composite electrode obtains the highest specific capacity of 484.8 C g−1, the lowest internal resistance of 1.96 Ω, the shortest time constant of 2.15 s, and the maximum diffusion coefficient of 2.27 × 10−14 cm2 s−1. The kinetic analysis of this electrode reveals the highest diffusion and the lowest non-diffusion contributions of 76.25% and 23.75% at 0.5 mV s−1, respectively. Ex-situ X-ray photoelectron spectroscopy shows that chemical valences of Mo and Co increased from +2 to +4 and from +2 to +3 after OH− insertion, respectively. The hybrid potassium dual-ion supercapacitor is assembled with alpha-Co(OH)2@Mo7S8 cathode (positive electrode) and molybdenum-phosphate-based MoPO@Mo7S8 anode (negative electrode). The device exhibits remarkable capacitance characteristics with a high specific energy of 59.4 Wh kg−1 at a specific power of 734 W kg−1 and a capacity-maintaining retention rate of 97.3% after 10,000 charge–discharge cycles.

KW - Alalpha-Co(OH)@MoS nanocomposite

KW - Electrodeposition

KW - Potassium dual-ion supercapacitors

KW - Specific energy

KW - Storage mechanism

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DO - 10.1016/j.electacta.2023.142467

M3 - Article

AN - SCOPUS:85156141963

SN - 0013-4686

VL - 458

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 142467

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