NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction

Zhao, Huihui; Yang, Yang; Dai, Xiaoping; Qiao, Hongyan; Yong, Jiaxi; Luan, Xuebin; Yu, Lei; Luan, Chenglong; Wang, Yao; Zhang, Xin

doi:10.1016/j.electacta.2018.11.150

Cited by 51 publications

(35 citation statements)

References 63 publications

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“…The Co 9 S 8 –NiS interface on CoNiS50, which are favorable for electron transfer, may also help to improve the efficiency of CoNiS50 in the electrocatalytic OER. − We investigate the influence of the Co 9 S 8 –NiS interface by using DFT calculations. As reflected in the XPS results, the molar ratio of Co 9 S 8 /NiS on CoNiS50 is larger than 1, indicating that the amount of Co 9 S 8 on the CoNiS50 surface is more than that of NiS.…”

Section: Resultsmentioning

confidence: 99%

“…Morphology is one of the factors influencing the performance of the transition-metal sulfides toward the electrocatalytic reactions. − Transition-metal sulfides in two-dimensional (2D) morphologies, for example, nanosheets, have higher electrocatalytic activities than the bulk materials due to the more flexible electron transfer along the in-plane surface as well as from the interior to the surface in the 2D materials. − The interface formed on the transition-metal sulfide catalysts is another factor affecting the electrocatalytic performance. ,− For instance, NiCo sulfide nanosheets decorated by NiCo hydroxide nanodots (NiCoDH/NiCoS) showed an improved efficiency in the electrocatalytic OER due to the synergetic effect triggered by the NiCoDH–NiCoS interface . Another example, Wang et al explored the effects of the sulfur bridges formed between carbon nanotubes and Co 9 S 8 nanoparticles on the electrocatalytic OER .…”

Section: Introductionmentioning

confidence: 99%

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Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Wang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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The electrocatalytic oxygen evolution reaction (OER) is an important factor affecting the efficiency of many energy systems, such as hydrogen production from water. However, there are still some problems with the electrocatalytic OER, for example, high overpotential and sluggish kinetics. Herein, we prepare 15 nm-thick two-dimensional (2D) composite nanosheets containing Co 9 S 8 and NiS on nickel foam. In the electrocatalytic OER, the overpotential at 50 mA cm −2 of the composite nanosheets is 253 mV, with a Tafel slope of 43 mV dec −1 . The electrocatalytic efficiency of the composite nanosheets is much better, as compared with the pure Co 9 S 8 , pure NiS, and conventional IrO 2 catalysts. The 2D composite nanosheets are flexible for electron transfer to trigger water splitting, thus enhancing the efficiency of the composite nanosheets in the electrocatalytic OER. Besides, theoretical calculations imply that the Co 9 S 8 −NiS interface on the composite nanosheets is the active site for the adsorption and splitting of the water molecules and promotes the transfer of the electrons from both Co 9 S 8 and NiS to the water molecule. This also favors for improving the efficiency of the composite nanosheets in the electrocatalytic OER. The results of the present work are beneficial for developing efficient noble metal-free catalysts for electrocatalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Wang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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“…The durability of γ-MnOOH/CoOOH was also investigated through chronoamperometry. Turnover frequency, mass activity, and Faradaic efficiency (FE) were obtained according to a previous reference …”

Section: Methodsmentioning

confidence: 99%

“…As an attractive and competitive technology, electrochemical water splitting has the advantage of an acknowledged ecofriendly process for the production of highly pure hydrogen. However, the half reaction on the anode (oxygen evolution reaction, OER) shows slow kinetics because of the transfer mechanism of a complex four-electron (4e) pathway and further results in the high overpotential of the process and the poor efficiency of the hydrogen generation. − So far, stainless steel is widely used in the field of industrial electrolysis of water in alkaline electrolyte, which usually is an alloy containing iron, nickel, and chromium . The revisit of NiFe-based OER electrocatalysts has focused on the higher activity and stability by rational design of NiFe oxides, layered double hydroxides, and their derivatives.…”

Section: Introductionmentioning

confidence: 99%

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

Cui

Zhao

Dai

et al. 2019

ACS Sustainable Chem. Eng.

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The chemical-coupled three-dimensional (3D) γ-MnOOH with CoOOH particles (γ-MnOOH/CoOOH) was fabricated through a two-step strategy involving a hydrothermal and reduction–oxidation process. The strong solid–solid interfacial interactions between γ-MnOOH rods and CoOOH particles feature the Mn–O–Co bond on the interface and a high valence state of cobalt in CoOOH. The branched γ-MnOOH/CoOOH composites demonstrate a significantly strengthened synergy effect for the oxygen evolution reaction (OER). The optimal B-MCO-0.1 (γ-MnOOH/CoOOH-0.1) shows an excellent OER performance, which requires an overpotential of 313 mV to reach the current density of 10 mA cm–2 with a lower Tafel slope (87 mV dec–1) and the strong durability in alkaline electrolyte. Specially, the intrinsic OER activity (versus electrochemical active surface area, ECSA) on B-MCO-0.1 at an overpotential of 420 mV is 16.3 and 8.9 times higher than those of γ-MnOOH and CoOOH, respectively. The results demonstrate that OER activity originates mainly from the interfacial coupling of γ-MnOOH and CoOOH. Our work highlights the vital function of the interfacial interactions in modulating the electronic structure of the active sites and suggests an effective avenue to rationally design highly active electrocatalysts.

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“…The similar strategy was also adopted to develop crystalline platinum oxide-decorated amorphous cobalt oxide hydroxide nanosheets and amorphous RuCu nanosheets grown on crystalline Cu nanotubes as HER catalysts [46,73]. Besides, enhanced catalytic effect by compositing hetero phases can be achieved by assembling amorphous nanosheets with nanodots [74], carbon nanofibers [75], metal oxide [76][77][78], etc. [79,80].…”

Section: Water Splittingmentioning

confidence: 99%

Manipulation on Two-Dimensional Amorphous Nanomaterials for Enhanced Electrochemical Energy Storage and Conversion

et al. 2021

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Low-carbon society is calling for advanced electrochemical energy storage and conversion systems and techniques, in which functional electrode materials are a core factor. As a new member of the material family, two-dimensional amorphous nanomaterials (2D ANMs) are booming gradually and show promising application prospects in electrochemical fields for extended specific surface area, abundant active sites, tunable electron states, and faster ion transport capacity. Specifically, their flexible structures provide significant adjustment room that allows readily and desirable modification. Recent advances have witnessed omnifarious manipulation means on 2D ANMs for enhanced electrochemical performance. Here, this review is devoted to collecting and summarizing the manipulation strategies of 2D ANMs in terms of component interaction and geometric configuration design, expecting to promote the controllable development of such a new class of nanomaterial. Our view covers the 2D ANMs applied in electrochemical fields, including battery, supercapacitor, and electrocatalysis, meanwhile we also clarify the relationship between manipulation manner and beneficial effect on electrochemical properties. Finally, we conclude the review with our personal insights and provide an outlook for more effective manipulation ways on functional and practical 2D ANMs.

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NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction

Cited by 51 publications

References 63 publications

Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

Manipulation on Two-Dimensional Amorphous Nanomaterials for Enhanced Electrochemical Energy Storage and Conversion

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NiCo-DH nanodots anchored on amorphous NiCo-Sulfide sheets as efficient electrocatalysts for oxygen evolution reaction

Cited by 51 publications

References 63 publications

Noble Metal-Free Co9S8 and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Noble Metal-Free Co9S8 and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Promotion of the Electrocatalytic Oxygen Evolution Reaction by Chemical Coupling of CoOOH Particles to 3D Branched γ-MnOOH Rods

Manipulation on Two-Dimensional Amorphous Nanomaterials for Enhanced Electrochemical Energy Storage and Conversion

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Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction

Noble Metal-Free Co₉S₈ and NiS Composite Nanosheets for Enhanced Electrocatalytic Oxygen Evolution Reaction