Journal ArticleDOI
Co9S8 nanoflakes on graphene (Co9S8/G) nanocomposites for high performance supercapacitors
Rajendran Ramachandran,M. Saranya,Chella Santhosh,V. Velmurugan,Bala P.C. Raghupathy,Soon Kwan Jeong,Andrews Nirmala Grace +6 more
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TLDR
In this article, the structural, morphological and physical properties of Co9S8/graphene nanocomposites were analyzed by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), XPS, and thermogravimetric analysis (TGA).Abstract:
Co9S8/graphene nanocomposites (Co9S8/G) at various concentrations of graphene and Co9S8 were prepared by a simple chemical route from cobalt nitrate and graphene as precursors in the presence of PVP as surfactant and thioacetamide (TAA) as sulfur source. To gain knowledge about the structural, morphological and physical properties, the composite material was analyzed by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric Analysis (TGA). SEM measurements showed the presence of well dispersed, ∼300 nm sized Co9S8 nanoflakes. To assess the properties of the nanocomposites for their applicability in supercapacitors, electrochemical analysis was carried out in 6 M KOH electrolyte. A maximum specific capacitance of 808 F g−1 was observed for Co9S8/G-d at 5 mV s−1 scan rate. Galvanostatic charge–discharge curves showed the excellent cyclic stability of Co9S8/G-d composite with higher charge–discharge duration than pure Co9S8. The excellent electrochemical performance of the composite could be due to the better electrical conductivity behavior of graphene on Co9S8 nanoflakes.read more
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First principles study on electrochemical and chemical stability of solid electrolyte–electrode interfaces in all-solid-state Li-ion batteries
Yizhou Zhu,Xingfeng He,Yifei Mo +2 more
TL;DR: In this paper, the authors performed first principles calculations to evaluate the thermodynamics of the interfaces between solid electrolyte and electrode materials and to identify the chemical and electrochemical stabilities of these interfaces.
Journal ArticleDOI
In Situ Transformation of MOFs into Layered Double Hydroxide Embedded Metal Sulfides for Improved Electrocatalytic and Supercapacitive Performance
TL;DR: This study demonstrates self-templated pseudomorphic transformation of MOF into surface chemistry rich hollow framework that delivers highly reactive, durable, and universal electrochemically active energy conversion and storage functionalities.
Journal ArticleDOI
Carbon-armored Co9S8 nanoparticles as all-pH efficient and durable H2-evolving electrocatalysts.
Feng Liangliang,Guo-Dong Li,Yipu Liu,Yuanyuan Wu,Hui Chen,Yun Wang,Yong-Cun Zou,Dejun Wang,Dejun Wang,Xiaoxin Zou +9 more
TL;DR: It is shown that cobalt pentlandite (Co9S8) nanoparticles can serve as an electrochemically active, noble-metal-free material toward hydrogen evolution reaction, and they work stably in neutral solution but not in acidic (pH 0) and basic ( pH 14) media.
Journal ArticleDOI
Solid-State Li–Metal Batteries: Challenges and Horizons of Oxide and Sulfide Solid Electrolytes and Their Interfaces
TL;DR: In this article, the authors present a roadmap for the development of a successful oxide and sulfide-based ASSLB focusing on interfacial challenges, while accounting for five parameters: energy density, power density, longterm stability, processing, and safety.
Journal ArticleDOI
Hollow mesoporous hetero-NiCo2S4/Co9S8 submicro-spindles: unusual formation and excellent pseudocapacitance towards hybrid supercapacitors
Linrui Hou,Yaoyao Shi,Siqi Zhu,Muhammad Rehan,Gang Pang,Gang Pang,Xiaogang Zhang,Changzhou Yuan +7 more
TL;DR: In this paper, a template-free methodology was proposed to fabricate high-quality uniform hollow hetero-NiCo2S4/Co9S8 (NCCS) submicro-spindles with well-dispersed heter-nanodomains at the nanoscale.
References
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Hierarchical porous NiCo2O4 nanomaterials with excellent cycling behavior for electrochemical capacitors via a hard-templating route
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Journal ArticleDOI
MWCNTs/metal (Ni, Co, Fe) oxide nanocomposite as potential material for supercapacitors application in acidic and neutral media
Abolanle S. Adekunle,Abolanle S. Adekunle,Abolanle S. Adekunle,Kenneth I. Ozoemena,Kenneth I. Ozoemena,Bolade O. Agboola +5 more
TL;DR: In this article, the capacitance properties of synthesised metal oxides nanoparticles (MO where M = Ni, Co, Fe) integrated with multi-wall carbon nanotubes (MWCNT) on basal plane pyrolytic graphite electrode (BPPGE) were investigated.
Journal ArticleDOI
Ferromagnetism in Co-doped (La,Sr)TiO3
Thomas Fix,M. Liberati,H. Aubriet,S.-L. Sahonta,Rantej Bali,C. Becker,David Ruch,Judith L. MacManus-Driscoll,Elke Arenholz,Mark G. Blamire +9 more
TL;DR: In this article, the origin of ferromagnetic activity in Co-doped (La,Sr)TiO3 epitaxial thin films is discussed, and it is shown that the activation of the ferromagnetism is not due to the presence of pure Co.