Etched and doped Co<sub>9</sub>S<sub>8</sub>/graphene hybrid for oxygen electrocatalysis

Dou, Shuo; Li, Tao; Huo, Jia; Wang, Shuangyin; Dai, Liming

doi:10.1039/c6ee00054a

Cited by 793 publications

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“…[22] In spite of enhanced electrocatalytic performance to some extent, the water splitting activity of the aforementioned Co 9 S 8 -based catalysts is still not satisfactory. One hand, the catalytic performance of powder Co 9 S 8 -based catalysts is greatly undermined because the active sites would be covered or annihilated during the preparation of test electrode with polymer binders.…”

Section: Doi: 101002/advs201700772mentioning

confidence: 99%

“…In comparison to bulk Co 9 S 8 , nanostructured Co 9 S 8 and its composites could afford more active sites and faster transfer rate of ions/electrons during the electrocatalytic reaction, and thus usually exhibiting enhanced HER and OER activities. [20][21][22][23][24] Currently, several Co 9 S 8 nanostructures (e.g., nanoparticles [25] and nanospheres [26] ) and their composites with carbons (Co 9 S 8 /reduced graphene oxides (RGO), [22] Co 9 S 8 /(N, S, P)-doped carbons, [27] Co 9 S 8 /Fe 3 O 4 / RGO, [23] and Co 9 S 8 /MoS 2 /Carbon fibres [25] ) have been reported. For example, Co 9 S 8 /N,P-carbon powder nanocomposites prepared by molten-salt calcination method at 900 °C exhibited an HER overpotential of 261 mV at 10 mA cm −2 in alkaline medium.…”

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confidence: 99%

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Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

et al. 2017

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water splitting is recognized as a highly potential technology to convert electricity into environment friendly and renewable chemical fuels (hydrogen and oxygen). [1][2][3] The cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) depend heavily on the development of cost-effective high-performance electrocatalysts. [4,5] Currently, platinum (Pt)/Pt-based alloy and iridium/ruthenium oxides (IrO 2 /RuO 2 ) are considered as the most promising electrocatalysts for HER and OER, respectively, but their scarcity, high cost, and compromised stability hinder their widespread applications. [6,7] Additionally, the best working situation for those OER and HER catalysts is often mismatchable since OER preferably takes place in alkaline or neutral solution while HER in acidic medium. [8,9] This would cause compromised performance for overall water splitting. For instance, the commercial alkaline electrolyzers require high cell voltages (1.8-2.0 V) to drive water splitting, [10] far ahead of the theoretical value of ≈1.23 V owing to high overpotentials on the sluggish of OER and HER. Therefore, it is highly desirable to explore alternative high-performance and low-cost bifunctional OER/HER electrocatalysts for overall water splitting. [11][12][13][14][15] Over the past decades, great progress has been achieved on the development of non-noble metal-based electrocatalysts for both OER and HER. Various nonprecious metal oxides, [9] sulfides, [16] selenides, [17] phosphides, and nitrides [18,19] have been exploited. Among these electrocatalysts, cobalt sulfide (Co 9 S 8 ) is regarded as an attractive electrocatalyst for water splitting due to its high catalytic activity for HER and OER simultaneously, and excellent electrochemical stability. In comparison to bulk Co 9 S 8 , nanostructured Co 9 S 8 and its composites could afford more active sites and faster transfer rate of ions/electrons during the electrocatalytic reaction, and thus usually exhibiting enhanced HER and OER activities. [20][21][22][23][24] Currently, several Co 9 S 8 nanostructures (e.g., nanoparticles [25] and nanospheres [26] ) and their composites with carbons (Co 9 S 8 /reduced graphene oxides (RGO), [22] Co 9 S 8 /(N, S, P)-doped carbons, [27] Co 9 S 8 /Fe 3 O 4 / RGO, [23] and Co 9 S 8 /MoS 2 /Carbon fibres [25] ) have been reported. For example, Co 9 S 8 /N,P-carbon powder nanocomposites prepared by molten-salt calcination method at 900 °C exhibited an HER overpotential of 261 mV at 10 mA cm −2 in alkaline medium. [20] N-Co 9 S 8 /graphene nanocomposites was achieved Designing ever more efficient and cost-effective bifunctional electrocatalysts for oxygen/hydrogen evolution reactions (OER/HER) is greatly vital and challenging. Here, a new type of binder-free hollow TiO 2 @Co 9 S 8 core-branch arrays is developed as highly active OER and HER electrocatalysts for stable overall water splitting. Hollow core-branch arrays of TiO 2 @Co 9 S 8 are readily realized by the rational combination of crosslinked Co 9 S 8 nanoflakes on ...

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Section: Doi: 101002/advs201700772mentioning

confidence: 99%

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confidence: 99%

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

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“…S13. † In the high-resolution spectrum of Co 2p, the peaks of Co-N x and Co-O species, which can enhance ORR catalytic activity under alkaline conditions, 18,57,58 were identified. The N 1s XPS of Z67D-700-L in Fig.…”

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Metal–polydopamine frameworks and their transformation to hollow metal/N-doped carbon particles

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aWe present a new strategy for in situ transformation of metal-organic framework (MOF) crystals to hollow metal-organic structures through polycondensation of dopamine. The hollow metal-polydopamine (PDA) particles are formed by a coordination assembly of metal ions (Co and Zn) and PDA, inheriting the morphology of MOF (ZIF-67 and ZIF-8) crystals. The hollow porous metal/N-carbon particles morphosynthetically transformed from hollow metal-PDA particles exhibit excellent oxygen reduction electrocatalytic activity. The strategy presented here is promising for synthesizing hollow metal-organic polymer (metal-carbon) particles with diverse morphologies for energy and environmental applications.

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“…2b also demonstrates the graphitic carbon resonances (G band) at about 1600 cm -1 and defect band (D band) at about 1350 cm -1 for MnONCNFs. These results suggest that, the Mno-based nanofibers have a graphitic structure with a certain amount of disorder carbon [21,36]. An estimation of the total order related to the carbon structures can be given by I D / I G .…”

Section: Electrocatalyst Characterizationmentioning

confidence: 97%

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

et al. 2017

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Development of cheap, abundant and noblemetal-free materials as high efficient oxygen reduction electrocatalysts is crucial for future energy storage system. Here, one-dimensional (1D) MnO N-doped carbon nanofibers (MnO-NCNFs) were successfully developed by electrospinning combined with high temperature pyrolysis. The MnO-NCNFs exhibit promising electrochemical performance, methanol tolerance, and durability in alkaline medium. The outstanding electrocatalytic activity is mainly attributed to several issues. First of all, the uniform 1D fiber structure and the conductive network could facilitate the electron transport. Besides, the introduction of Mn into the precursor can catalyze the transformation of amorphous carbon to graphite carbon, while the improved graphitization means better conductivity, beneficial for the enhancement of catalytic activity for oxygen reduction reaction (ORR). Furthermore, the porous structure and high surface area can effectively decrease the mass transport resistance and increase the exposed ORR active sites, thus improve utilization efficiency and raise the quantity of exposed ORR active sites. The synergistic effect of MnO and NCNFs matrix, which enhances charge transfer, adsorbent transport, and delivers efficiency in the electrolyte solution, ensures the high ORR performance of MnO-NCNFs.

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Etched and doped Co₉S₈/graphene hybrid for oxygen electrocatalysis

Abstract: Simultaneous etching and doping of cobalt sulfides–graphene hybrid with NH3-plasma effectively enhances the oxygen electrocatalytic activity.

Cited by 793 publications

References 50 publications

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Metal–polydopamine frameworks and their transformation to hollow metal/N-doped carbon particles

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

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Etched and doped Co9S8/graphene hybrid for oxygen electrocatalysis

Abstract: Simultaneous etching and doping of cobalt sulfides–graphene hybrid with NH3-plasma effectively enhances the oxygen electrocatalytic activity.

Cited by 793 publications

References 50 publications

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Metal–polydopamine frameworks and their transformation to hollow metal/N-doped carbon particles

Encapsulated MnO in N-doping carbon nanofibers as efficient ORR electrocatalysts

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Product

Resources

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Etched and doped Co₉S₈/graphene hybrid for oxygen electrocatalysis

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production