Synthesis of Cobalt Sulfide/Sulfur Doped Carbon Nanocomposites with Efficient Catalytic Activity in the Oxygen Evolution Reaction

Qian, Huayu; Tang, Jing; Wang, Zhongli; Kim, Jeonghun; Kim, Jung Ho; Alshehri, Saad M.; Yanmaz, E.; Wang, Xin; Yamauchi, Yusuke

doi:10.1002/chem.201604162

Cited by 47 publications

(32 citation statements)

References 40 publications

(84 reference statements)

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“…This overpotential is 130 mV less than that for the RuO 2 catalyst. Meanwhile, the activity of Ni−Mo−S herein is also better or comparable to some of previously‐ reported OER catalysts, such as NiFe foam (η 100 =390 mV), cobalt sulfide/sulfur doped carbon nanocomposites (η 100 =420 mV), etc., as summarized in Table S3. The corresponding Tafel plots indicate that the Ni−Mo−S has a smaller Tafel slope (75 mV dec −1 ) than that of NF (106 mV dec −1 ) and RuO 2 (80 mV dec −1 ) (Figure b), suggesting a favorable OER kinetics on the Ni−Mo−S electrode.…”

Section: Resultssupporting

confidence: 76%

Porous Ni−Mo−S Nanowire Network Film Electrode as a High‐Efficiency Bifunctional Electrocatalyst for Overall Water Splitting

Meng

Wang

et al. 2017

ChemElectroChem

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Developing noble‐metal‐free electrocatalysts with excellent activity and stability for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential for promoting the generation of H2 by electrocatalytic water splitting. Herein, a novel 3D self‐supported Ni−Mo−S nanowire network film electrode was prepared by facile electroplating nickel−molybdenum on nickel foam followed by sulfurization as bifunctional catalysts for both HER and OER. Electrochemical measurements reveal that superb high catalytic activity and durability is acquired on the Ni−Mo−S electrode, which can afford an electrocatalytic current density of 100 mA cm−2 with an overpotential of 290 mV for the HER and an overpotential of 390 mV for the OER in alkaline medium. Coupled with the superior and robust OER catalytic activity, an alkaline electrolyzer that can achieve 100 mA cm−2 at a cell voltage of 2.0 V was constructed by applying Ni−Mo−S||Ni−Mo−S for overall water splitting, thus indicating a homogeneous, cost‐effective, and earth‐abundant material system for highly efficient H2 production.

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Section: Resultssupporting

confidence: 76%

Porous Ni−Mo−S Nanowire Network Film Electrode as a High‐Efficiency Bifunctional Electrocatalyst for Overall Water Splitting

Meng

Wang

et al. 2017

ChemElectroChem

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“…During OER, due to oxidation of Co 2+ to Co 3+ , there is a change in the satellite structure as well as an increase in Co 2+ /Co 3+ to 1.57 due to the transformation of Co(OH) 2 to the active CoOOH phase as shown in Figure b. After electrochemical testing of 50 cycles, Co 2+ in Co(OH) 2 is characterized by the Co 2p 3/2 peak at 780.8 eV and its satellite at a distance of 5.0 eV which corresponds to the CoOOH formation . This is confirmed by the shift of the Co 2p 3/2 peak to a binding energy of 780.3 eV and the appearance of the Co 3+ satellite at a distance of 10 eV after the electrochemical test.…”

Section: Resultsmentioning

confidence: 95%

Layer‐by‐Layer Coating of Cobalt‐Based Ink for Large‐Scale Fabrication of OER Electrocatalyst

et al. 2019

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The scalability and stability of electrocatalysts is one of the biggest challenges for their practical applicability. In this context, Co3O4 nanoparticles conformally coated on a light weight, 3D and highly conducting carbon cloth are fabricated using an easily synthesized cobalt hexadecylthiolate complex as ink. This method is especially useful for large‐scale production as the complex is synthesized in large quantities and coated on 3D substrates by a simple dip‐coating method. The optimum loading of the catalyst is achieved through a layer‐by‐layer (LbL) assembly of a cobalt hexadecylthiolate complex via repeated dip coating of the carbon cloth electrode in the solution. The Co3O4/CC undergoes electrochemical oxidation and converts to CoOOH as an active species and acts as a highly efficient electrocatalyst with optimized loading. The Co3O4‐16/CC with 16 times dip coating exhibits remarkable stability over 24 h with an overpotential of 300 mV at 10 mA cm−2 and a Tafel slope of 77.06 mV dec−1. The electrocatalytic activity of Co3O4‐16/CC prepared by LbL coating is better than conventional Co3O4 and comparable to IrO2 and RuO2 electrocatalysts with the future possibility of commercial‐scale production at lower cost.

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“…Qian et al. have successfully synthesized Co 9 S 8 /S‐C composites by calcinating a cobalt coordination polymer in an inert atmosphere, which is based on a S‐rich ligand 4‐imidazoledithiocarboxylic acid . Moreover, Liu et al.…”

Section: Diverse Regulating Factorsmentioning

confidence: 99%

Controllable Syntheses of MOF‐Derived Materials

Zou

2018

Chemistry A European J

122

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Metal-organic frameworks (MOFs), as an important kind of porous inorganic-organic hybrid materials with inherent outstanding physicochemistry characteristics, can be widely applied as versatile precursors for the facile preparation of functional MOF-derived materials. However, there are plenty of sophisticated factors during the synthetic process, which is far from reaching the goal of effectively controlling the nature of MOF-derived materials (such as the composition, morphology and surface area). Therefore, it is urgently necessary to develop regular protocols and concepts for controllable syntheses of MOF-derived materials. In this minireview, we mainly summarize and analyze complicated factors in the fabrication of MOF-derived materials according to recently reported literatures, and this provides a new insight into the rational design and syntheses of MOF-derived materials.

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Synthesis of Cobalt Sulfide/Sulfur Doped Carbon Nanocomposites with Efficient Catalytic Activity in the Oxygen Evolution Reaction

Cited by 47 publications

References 40 publications

Porous Ni−Mo−S Nanowire Network Film Electrode as a High‐Efficiency Bifunctional Electrocatalyst for Overall Water Splitting

Porous Ni−Mo−S Nanowire Network Film Electrode as a High‐Efficiency Bifunctional Electrocatalyst for Overall Water Splitting

Layer‐by‐Layer Coating of Cobalt‐Based Ink for Large‐Scale Fabrication of OER Electrocatalyst

Controllable Syntheses of MOF‐Derived Materials

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