Electrospinning CoS2/carbon nanofibers with enhanced stability as electrode materials for supercapacitors

Wang, Zhao; Liu, Chao; Shi, Gaofeng; Wang, Guoying; Zhang, Qi; Zhang, Hongquan; Su, Ying; Yu, Jianglei; Li, Xin; Luo, Fengfang; Hu, Yawen; Yi, Kaiqiang

doi:10.1007/s11581-020-03725-z

Cited by 15 publications

(3 citation statements)

References 43 publications

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“…Another interesting and promising material in the context of electrocatalysis has been layered MoS 2 . , The versatile HER and OER electrocatalyses exhibited by the latter on account of its active edge sites and basal sulfide terminations have granted its application in all the relevant fields of electrocatalysis. The interfacial engineering in MoS 2 by chemical modification and heterostructure formation has been explored to good effect to achieve excellent UOR and MOR catalysis . The synergistic heterostructuring with MoS 2 has been seen to positively influence electrocatalytic credentials.…”

Section: Introductionmentioning

confidence: 99%

“…The interfacial engineering in MoS 2 by chemical modification and heterostructure formation has been explored to good effect to achieve excellent UOR and MOR catalysis. 35 The synergistic heterostructuring with MoS 2 has been seen to positively influence electrocatalytic credentials. Interestingly, the Mo (+6) oxidation state in MoS 2 is expected to induce oxidative changes in the other components and synergistically enhance the overall electrocatalytic performance.…”

Section: ■ Introductionmentioning

confidence: 99%

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Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

2023

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The urea oxidation reaction (UOR) and methanol oxidation reaction (MOR) are the most practical alternative counter-reactions to the hydrogen evolution reaction in the overall electrochemical water splitting process. The thermodynamic gains in terms of lower water-splitting potentials compared to the oxygen evolution reaction (OER) can be cashed in if the kinetics of the UOR and MOR can suitably be controlled. This has called for the development of suitable cost-effective and non-precious catalysts for the processes. Herein, we report the synthesis of a heterostructured composite catalyst that incorporates the versatile NiCoP and MoS 2 components through a composite MOF degradation route for efficient UOR and MOR catalysis in an alkaline medium (0.5 M NaOH). The intimate union of the components generates the strong synergistic influence of catalytically active phosphide and sulfide components toward excellent electrocatalytic UOR and MOR performance. The cyclic voltammetry and linear sweep voltammetry analyses reveal anodic UOR and MOR peak currents of 92.5 and 214.2 mA cm −2 , respectively. Also, a benchmark current of 50 mA cm −2 is achieved at voltages of 1.55 and 1.53 V versus the reversible hydrogen electrode for the UOR and MOR, respectively, which reflects a considerable kinetic facility over the OER. The electrochemical impedance (EIS) measurements reveal considerably enhanced kinetics over the control samples and the OER on the catalyst systems. Additionally, the catalytic synergism is clearly reflected as the catalytic credentials of the composite catalysts surpass those of the individual control samples significantly. The catalytic features compare well with the best catalysts reported for the UOR and MOR in the alkaline medium.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

2023

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“…The CV curves of bulk-CoS and EF-CoS with a scan rate of 5 mV•s −1 in the range of potential from 0 to 0.55 V are demonstrated in Figure 4a, which presents a similar shape of rectangular with evident oxidation and reduction peaks illustrating the capacitive characteristics of the electrodes mainly derived from the combined effect of Faraday redox reactions and double layer capacitance. The CV curves both exhibit two redox couples corresponding to the simultaneous reversible electron transfer processes between cobalt ions of different valence states (Co 2+ /Co 3+ and Co 3+ /Co 4+ ) on the surface of the CoS electrode in alkaline electrolyte media [26]:…”

Section: Electrochemical Performancementioning

confidence: 99%

Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation

Tian

Sun

et al. 2023

Nanomaterials

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Two-dimensional nanomaterials hold great promise as electrode materials for the construction of excellent electrochemical energy storage and transformation apparatuses. In the study, metallic layered cobalt sulfide was, firstly, applied to the area of energy storage as a supercapacitor electrode. By a facile and scalable method for cathodic electrochemical exfoliation, metallic layered cobalt sulfide bulk can be exfoliated into high-quality and few-layered nanosheets with size distributions in the micrometer scale range and thickness in the order of several nanometers. With a two-dimensional thin sheet structure of metallic cobalt sulfide nanosheets, not only was a larger active surface area created, but also, the insertion/extraction of ions in the procedure of charge and discharge were enhanced. The exfoliated cobalt sulfide was applied as a supercapacitor electrode with obvious improvement compared with the original sample, and the specific capacitance increased from 307 F∙g−1 to 450 F∙g−1 at the current density of 1 A∙g−1. The capacitance retention rate of exfoliated cobalt sulfide enlarged to 84.7% from the original 81.9% of unexfoliated samples while the current density multiplied by 5 times. Moreover, a button-type asymmetric supercapacitor assembled using exfoliated cobalt sulfide as the positive electrode exhibits a maximum specific energy of 9.4 Wh∙kg−1 at the specific power of 1520 W∙kg−1.

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Mixed NiCo-phosphate/sulphide heterostructure as an efficient electrocatalyst for hydrogen evolution reaction

2022

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Electrospinning CoS2/carbon nanofibers with enhanced stability as electrode materials for supercapacitors

Cited by 15 publications

References 43 publications

Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation

Mixed NiCo-phosphate/sulphide heterostructure as an efficient electrocatalyst for hydrogen evolution reaction

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Electrospinning CoS2/carbon nanofibers with enhanced stability as electrode materials for supercapacitors

Cited by 15 publications

References 43 publications

Composite Metal–Organic Framework-Derived NiCoP/MoS2 Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

Composite Metal–Organic Framework-Derived NiCoP/MoS2 Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

Enhanced Electrochemical Performance of Metallic CoS-Based Supercapacitor by Cathodic Exfoliation

Mixed NiCo-phosphate/sulphide heterostructure as an efficient electrocatalyst for hydrogen evolution reaction

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Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation

Composite Metal–Organic Framework-Derived NiCoP/MoS₂ Heterostructure with Superior Electrocatalytic Credentials for Urea and Methanol Oxidation