Ultrathin Co<sub>3</sub>S<sub>4</sub> Nanosheets that Synergistically Engineer Spin States and Exposed Polyhedra that Promote Water Oxidation under Neutral Conditions

Liu, Youwen; Xiao, Chong; Lyu, Mengjie; Lin, Yue; Cai, Weizheng; Huang, Pengcheng; Wei, Tong; Zou, Yousheng; Xie, Yi

doi:10.1002/ange.201505320

Cited by 124 publications

(71 citation statements)

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“…[1][2][3][4][5][6][7][8] Nickel sulfide (NiS), has been extensively used for dye-sensitized solar cells, 9 supercapacitors, 10 lithium ion batteries, 11 electrocatalysts 12 and photocatalysts 13 due to its high electronic conductivity, low cost, and simple production. Although numerous NiS compounds have been prepared using various morphologies such as: nanoframes, 14 hollow spheres, 15 core-shell structure, 16 nanorods, 17 nanoflake arrays, 18 nanosheets, 19 urchin-like micro/nanostructures, 20 the synthesis of hierarchical flower-like NiS has been limited.…”

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confidence: 99%

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)

Zhang

et al. 2017

J. Electrochem. Soc.

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The synthesis of a novel hierarchical flower-like NiS via a solvothermal method for the electrochemcial oxidation of H 2 O 2 on a carbon paste electrode with high catalytic activity for the (MOR) in an alkaline medium has been reported. Novel nickel sulfide (NiS) hierarchical flower-like structures were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscopy. A carbon paste electrode was modified with the as-prepared hierarchical flower-like NiS, resulting in a high electrocatalytic activity toward the oxidation of H 2 O 2 . The NiS-modified electrode was used for H 2 O 2 sensing, which was achieved over a wide linear range from 0.5 μM to 1.37 mM (I/μA = −0.19025 + 0.06094 C/mM) with a low limit of detection (LOD) of 0.3 μM and a limit of quantitation (LOQ) of 0.8 μM. The hierarchical flower-like NiS also exhibited a high electrocatalytic activity for the methanol oxidation reaction (MOR) in an alkaline medium with a high tolerance toward the catalyst-poisoning species generated during the MOR. The MOR proceeded via the direct electrooxidation of methanol on the oxidized NiS surface layer because the oxidation peak potential of the MOR was more positive than that of the oxidation of NiS. In recent years, a variety of metal sulfides nanostructures have been widely investigated due to their potential applications in energy storage and conversion devices, light-emitting diodes, photocatalytic and electrocatalytic reactions, sensors, thermoelectric devices, and memory devices. [21][22][23] In this work, we report the facile synthesis of NiS hierarchical flower-like nanostructures using a solvothermal route. The electrocatalytic performances of these NiS nanostructures were also investigated.Hydrogen peroxide (H 2 O 2 ) has attracted a great attention due to its importance as a reactive oxygen species and its involvement in chemical, biological, food-processing, medical, diagnostic, and environmental related fields. 35 have been employed for this purpose, the preparation of the hierarchical nanostructure with high surface area is still a challenge for fabricating an efficient sensing platform for H 2 O 2 .Pt-based materials are currently the most common electrocatalysts used as anodes in direct methanol fuel cells (DMFC) due to their high electrocatalytic activities. 36,37 However, Pt suffers from a high price and tendency to be poisoned by CO that occupies the active sites of the Pt via adsorption and block the transportation of z E-mail: baiqingyuan1981@126.com; c.fernandez@rgu.ac.uk methanol in its oxidation, limiting its utility in commercial applications. Therefore, the development of cost effective catalysts is highly desirable. Ni-based compounds are interesting alternatives to Pt due to their relative low costs and high electrocatalytic activity, which have attracted considerable recent attention 38,39 due to the Ni (II)/Ni (III) redox reactions. 40 To the best of our knowledge, this is the first time that the synthesis of a novel hierarchical flower-like NiS v...

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Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)

Zhang

et al. 2017

J. Electrochem. Soc.

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“…The main obstacle to achieving high‐performance water splitting is lowering the driving overpotential and improving the efficacy of the electrocatalyst. The expected performance of an electrocatalyst for the overall water‐splitting system is largely dependent on: a) the intrinsic activity of catalytic active sites, b) the improved conductivity of the electrode material, c) the increased mass transfer properties, and d) the increased density of electrocatalytic active sites or surface area of the electrocatalysts …”

Section: Spe For Energy Conversion and Environmental Treatmentmentioning

confidence: 99%

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Uddin

Zhang

et al. 2020

Advanced Materials

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The structure–property engineering of phase‐based materials for redox‐reactive energy conversion and environmental decontamination nanosystems, which are crucial for achieving feasible and sustainable energy and environment treatment technology, is discussed. An exhaustive overview of redox reaction processes, including electrocatalysis, photocatalysis, and photoelectrocatalysis, is given. Through examples of applications of these redox reactions, how structural phase engineering (SPE) strategies can influence the catalytic activity, selectivity, and stability is constructively reviewed and discussed. As observed, to date, much progress has been made in SPE to improve catalytic redox reactions. However, a number of highly intriguing, unresolved issues remain to be discussed, including solar photon‐to‐exciton conversion efficiency, exciton dissociation into active reductive/oxidative electrons/holes, dual‐ and multiphase junctions, selective adsorption/desorption, performance stability, sustainability, etc. To conclude, key challenges and prospects with SPE‐assisted redox reaction systems are highlighted, where further development for the advanced engineering of phase‐based materials will accelerate the sustainable (active, reliable, and scalable) production of valuable chemicals and energy, as well as facilitate environmental treatment.

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“…However, only very few studies have been performed to investigate the application of Co3S4 as the CE for DSSCs [30][31]. Moreover, theoretical simulations and experimental evidence confirm that Co3S4 is of metallic behavior, which is remarkably different from CoS and Co9S8 [32]. Consequently, Co3S4 could be an ideal conductor to couple with MoS2 to form composite as high-performance CE material for DSSCs.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal growth of MoS2/Co3S4 composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

Dong

Guo

et al. 2017

Sci. China Mater.

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MoS2/Co3S4 composite films were prepared via a facile one-step hydrothermal method, and used as efficient and low-cost Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). Characterizations revealed that Co3S4 and MoS2 were obtained simultaneously during the facile hydrothermal process. The composites afforded a promising synergistic effect on the catalyzing of triiodide reduction. Enhanced electrocatalytic performance of the resultant composite films was confirmed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. DSSCs using MoS2/Co3S4 composite CEs outperform the devices with pristine MoS2 or Co3S4 CEs in power conversion efficiency (PCE). Furthermore, a PCE of 6.77% is obtained for the optimized devices using MoS2/Co3S4 composite CEs measured under standard 1 sun illumination (100 mW cm −2 , AM 1.5G), which is comparable to that of the devices fabricated under the same conditions with conventional thermally deposited Pt CEs (7.14%). The results demonstrate that MoS2/Co3S4 composites are promising alternatives to Pt to be applied as CEs for DSSCs.

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Ultrathin Co₃S₄ Nanosheets that Synergistically Engineer Spin States and Exposed Polyhedra that Promote Water Oxidation under Neutral Conditions

Cited by 124 publications

References 24 publications

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Hydrothermal growth of MoS2/Co3S4 composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

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Ultrathin Co3S4 Nanosheets that Synergistically Engineer Spin States and Exposed Polyhedra that Promote Water Oxidation under Neutral Conditions

Cited by 124 publications

References 24 publications

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H2O2and the Methanol Oxidation Reaction (MOR)

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H2O2and the Methanol Oxidation Reaction (MOR)

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Hydrothermal growth of MoS2/Co3S4 composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

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Product

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Ultrathin Co₃S₄ Nanosheets that Synergistically Engineer Spin States and Exposed Polyhedra that Promote Water Oxidation under Neutral Conditions

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)

Facile Synthesis of a Nickel Sulfide (NiS) Hierarchical Flower for the Electrochemical Oxidation of H₂O₂and the Methanol Oxidation Reaction (MOR)