Size-controlled hydrothermal synthesis and high electrocatalytic performance of CoS2 nanocatalysts as non-precious metal cathode materials for fuel cells

Zhao, Chen; Li, Dianqing; Feng, Yongjun

doi:10.1039/c3ta10296c

Cited by 79 publications

(46 citation statements)

References 34 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Of the different metal sulfides, cobalt sulfides with diverse stoichiometric compositions (CoS, Co 3 S 4 , CoS 2 , and Co 9 S 8 ) have been considered promising materials in various fields such as catalysis, magnetic devices, and energy storage. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] Recently, cobalt sulfides have been investigated as electrode materials for Liion batteries (LIBs) because of their high theoretical capacity. [22][23][24][25][26][27][28] However, electrodes based on cobalt sulfide have a few inherent limitations such as poor cycle stability and a large volume change during Li-ion insertion/extraction.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Choi

Park

et al. 2013

Chemistry An Asian Journal

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In this study, we report the first preparation of phase-pure Co9S8 yolk–shell microspheres in a facile two-step process and their improved electrochemical properties. Yolk–shell Co3O4 precursor microspheres are initially obtained by spray pyrolysis and are subsequently transformed into Co9S8 yolk–shell microspheres by simple sulfidation in the presence of thiourea as a sulfur source at 350 °C under a reducing atmosphere. For comparison, filled Co9S8 microspheres were also prepared using the same procedure but in the absence of sucrose during the spray pyrolysis. The prepared yolk–shell Co9S8 microspheres exhibited a Brunauer–Emmett–Teller (BET) specific surface area of 18 m(2) g(−1) with a mean pore size of 16 nm. The yolk–shell Co9S8 microspheres have initial discharge and charge capacities of 1008 and 767 mA h g(−1) at a current density of 1000 mA g(−1), respectively, while the filled Co9S8 microspheres have initial discharge and charge capacities of 838 and 638 mA h g(−1), respectively. After 100 cycles, the discharge capacities of the yolk–shell and filled microspheres are 634 and 434 mA h g(−1), respectively, and the corresponding capacity retentions after the first cycle are 82% and 66%.

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Section: Introductionmentioning

confidence: 99%

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Choi

Park

et al. 2013

Chemistry An Asian Journal

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“…3). 13,19 In addition, these results suggest the exploration of nonprecious HER electrocatalysts including MoS2, 36 CoS2, 37 and Ni12P5 38 as alternatives to Pt catalysts, which may be expected to achieve superior PEC performance while reducing material cost. Name., 2012, 00, 1-3 This journal is © The Royal Society of Chemistry 2012 Finally, the long-term durability of 20-µm-thin Si photocathodes employing Pt NPs/Si NHs was assessed via chronoamperometry at 0V vs. RHE (Fig.…”

Section: Thickness Reduction In High-purity Silicon Wafers Is Beneficmentioning

confidence: 90%

High performance H₂ evolution realized in 20 μm-thin silicon nanostructured photocathodes

Jung

Park

et al. 2015

J. Mater. Chem. A

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“…The half-wave potential is also enhanced from 0.64 V for the as-prepared sample to 0.71 V for CoS-400, and then reduced to 0.51 V for CoS-450. The value of 0.71 V is the highest value among non-precious metal chalcogenides [3,11] and very close to 0.77 V for RuSex/C [20]. At 2500 rpm, in comparison, jR (HO2 − oxidation) is much smaller than jD (oxygen reduction), meaning that H2O was the main product of ORR catalyzed by the prepared catalysts.…”

Section: Structure and Morphologymentioning

confidence: 94%

“…Recently, non-precious metal chalcogenides, e.g., MS2 {M = Fe [9], Co and (Co, Ni) [10]} thin film, CoS2 [11], CoSe2 [12,13], Co1−xS [14] nanoparticles have attracted extensive attention due to promising catalytic activity for ORR, low cost and abundant reserve in the earth's crust. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Positive Effect of Heat Treatment on Carbon-Supported CoS Nanocatalysts for Oxygen Reduction Reaction

Zhong

Tang

et al. 2015

Catalysts

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It is of increasing interest and an important challenge to develop highly efficient less-expensive cathode catalysts for anion-exchange membrane fuel cells (AEMFCs). In this work, we have directly prepared a carbon-supported CoS nanocatalyst in a solvothermal route and investigated the effect of heat-treatment on electrocatalytic activity and long-term stability using rotating ring-disk electrode (RRDE). The results show that the heat-treatment below 400 °C under nitrogen atmosphere significantly enhanced the electrocatalytic performance of CoS catalyst as a function of annealed temperature in terms of the cathodic current density, the half-wave potential, the HO2 − product and the number of electrons transferred. The CoS catalyst that annealed at 400 °C (CoS-400) has exhibited a promising performance with the half-wave potential of 0.71 V vs. RHE (the highest one for non-precious metal chalcogenides), the minimum HO2 − product of 4.3% at 0.60 V vs. RHE and close to the 4-electron pathway during the oxygen reduction reaction in 0.1 M KOH. Also, the CoS-400 catalyst has comparable durability to the Pt/C catalyst.

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Size-controlled hydrothermal synthesis and high electrocatalytic performance of CoS2 nanocatalysts as non-precious metal cathode materials for fuel cells

Cited by 79 publications

References 34 publications

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

High performance H₂ evolution realized in 20 μm-thin silicon nanostructured photocathodes

Positive Effect of Heat Treatment on Carbon-Supported CoS Nanocatalysts for Oxygen Reduction Reaction

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Size-controlled hydrothermal synthesis and high electrocatalytic performance of CoS2 nanocatalysts as non-precious metal cathode materials for fuel cells

Cited by 79 publications

References 34 publications

Preparation of Yolk‐Shell and Filled Co9S8 Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co9S8 Microspheres and Comparison of their Electrochemical Properties

High performance H2 evolution realized in 20 μm-thin silicon nanostructured photocathodes

Positive Effect of Heat Treatment on Carbon-Supported CoS Nanocatalysts for Oxygen Reduction Reaction

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Product

Resources

About

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

High performance H₂ evolution realized in 20 μm-thin silicon nanostructured photocathodes