Controllable synthesis of hierarchical nickel cobalt sulfide with enhanced electrochemical activity

Tie, Jinjin; Han, Jiaxi; Diao, Guiqiang; Liu, Jiwen; Xie, Zhuopeng; Cheng, Gao; Sun, Ming; Yu, Lin

doi:10.1016/j.apsusc.2017.11.086

Cited by 22 publications

(5 citation statements)

References 29 publications

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“…It is deduced that this apparent difference should be ascribed to the sulfuration of Co precursor occurring at relatively low temperature during pyrolysis, which prevents the decomposition at high temperature and benefits the preservation of morphology. Close observation from high‐resolution TEM images of CoS NWs@NSC‐2 (insets of Figure D and Figure S4, Supporting Information) reveals lattice fringes with interplanar spacing values of 0.34, 0.25, and 0.18 nm, which is well according to the (002) plane of graphite, (101) plane of CoS (JCPDS 65‐3418), and (440) plane of Co 9 S 8 (JCPDS 65‐1765), respectively . Therefore, the high‐resolution transmission electron microscopy (HRTEM) results confirm that the CoS and Co 9 S 8 phases should constitute the metal core of CoS NWs@NSC‐2.…”

Section: Methodsmentioning

confidence: 78%

Cobalt Sulfide Nanowires Core Encapsulated by a N, S Codoped Graphitic Carbon Shell for Efficient Oxygen Reduction Reaction

Han

Wang

et al. 2018

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Exploration of economical electrocatalysts for highly efficient and stable oxygen reduction reaction (ORR) is believed to be essential for diverse future renewable energy applications. Herein, cobalt sulfide nanowire core encapsulated in a N, S codoped graphitic carbon shell (CoS NWs@NSC) is successfully fabricated via the calcination of polydopamine-coated Co(CO ) (OH) H O NWs with sulfur powder under argon atmosphere. The uniform encapsulation of CoS core by N, S codoped graphitic carbon shell favors the interaction of the core-shell structure for generating stable and numerous ORR active sites homogeneously dispersed throughout the materials. Meanwhile, the wire-like CoS NWs@NSC stacks to form 3D mesoporous conductive networks, which improves the mass and charge transport capability of catalyst. Accordingly, the resultant CoS NWs@NSC electrocatalysts possess excellent ORR activity through the four-electron pathway with superior stability and methanol tolerance over the Pt/C in 0.1 m KOH. This strategy can offer inspiration for designing and fabricating novel core-shell-structured nanomaterials with active sites derived from uniform morphology as potential electrocatalysts for various vital renewable energy devices.

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Section: Methodsmentioning

confidence: 78%

Cobalt Sulfide Nanowires Core Encapsulated by a N, S Codoped Graphitic Carbon Shell for Efficient Oxygen Reduction Reaction

Han

Wang

et al. 2018

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“…Herein, we report the preparation, crystal structure, and characterization of 3D supramolecular structure of cyclohexylammonium tetraisothiocyanatocobaltate(II), (HCHA) 2 [Co(NCS) 4 ], which was utilized as a single-source precursor, through its thermal decomposition, for the synthesis of cobalt sulfide (CoS) and tricobalt tetraoxide (Co 3 O 4 ) nanoparticles. Cobalt sulfide finds widespread applications such as electrochemical conductivity [23, 24], electrochemical water splitting with photo anodes [25, 26], and supercapacitors with enhanced charge capacity and stability [27, 28]. On the other hand, tricobalt tetraoxide (Co 3 O 4 ) has been reported for use in supercapacitors, magnetic semiconductors [29, 30, 31], photocatalysis [32, 33], carbon monoxide (CO) and hydrocarbon oxidations, and other catalysis applications [34, 35, 36, 37, 38].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure, and characterization of cyclohexylammonium tetraisothiocyanatocobaltate(II): A single-source precursor for cobalt sulfide and oxide nanostructures

Bagabas

Alsawalha

Sohail

et al. 2019

Heliyon

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We successfully synthesized 3D supramolecular structure of cyclohexylammonium tetraisothiocyanatocobaltate(II) complex, (C6H11NH3)2[Co(NCS)4], in almost a quantitative yield by using metathesis and ligand addition reactions. The new complex was characterized by various techniques such as FTIR, UV-Visible, PXRD, SXRD, and CV electrochemical analysis to investigate mainly its structure. Based on the results of these techniques, the formation of the desired complex was confirmed. The TGA for this complex indicated the utilization of this complex as a single-source precursor for the synthesis of cobalt sulfide (CoS) under helium atmosphere and tricobalt tetraoxide (Co3O4) under air. Investigation of pyrolysis products by PXRD proved the formation of CoS and Co3O4. Furthermore, morphology studies by SEM and TEM displayed the formation of CoS and Co3O4 nanoparticles with various shapes.

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“…A promising strategy which improve the electronic state of intrinsic material have been shown in extensive studies. In this strategy, interface catalysts, such as transition metal oxides [18][19][20] and sulfides, [21][22][23][24] are designed and combined with carbon materials [25,26] or precious metals. [27,28] Many reports focus on the improving the electronic state by directly modifying the local crystalline structure or contacting the interface with the second phase material [29] but not interface interactions.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hydrogen Evolution by Optimizing the Hydrogen Adsorption on Titanium Monoxide Nanodot‐Decorated Cobalt Sulfide Nanosheets

et al. 2021

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Modulating the local electronic state of metal compounds through interfacial interaction has become a key method for manufacturing high-performance hydrogen evolution reaction (HER) electrocatalysts. The electron-rich active sites can promote the adsorption of hydrogen, which accelerates the Volmer step and thereby enhances the electrocatalytic performance of HER. Here, we found that the strong interfacial interaction between TiO nanodots (TiO/CoÀ S) and CoÀ S nanosheets could advantageously improve the performance toward HER of electrocatalyst. Meanwhile, XPS results showed that modulating the local electronic structure of the TiO nanodots produces electron-rich regions on Co. As a result, the overpotential of the TiO/CoÀ S nanocomposite at 10 mA cm À 2 was 107 mV, and the Tafel slope was 83.3 mV dec À 1 . This study focused on the effect of the solid-solid interface on the local electronic structure of the catalytic metal active sites and successfully improved the catalytic activity of transition metal materials in HER catalysis.

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Controllable synthesis of hierarchical nickel cobalt sulfide with enhanced electrochemical activity

Cited by 22 publications

References 29 publications

Cobalt Sulfide Nanowires Core Encapsulated by a N, S Codoped Graphitic Carbon Shell for Efficient Oxygen Reduction Reaction

Cobalt Sulfide Nanowires Core Encapsulated by a N, S Codoped Graphitic Carbon Shell for Efficient Oxygen Reduction Reaction

Synthesis, crystal structure, and characterization of cyclohexylammonium tetraisothiocyanatocobaltate(II): A single-source precursor for cobalt sulfide and oxide nanostructures

Enhancing Hydrogen Evolution by Optimizing the Hydrogen Adsorption on Titanium Monoxide Nanodot‐Decorated Cobalt Sulfide Nanosheets

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