Anodic Hydrazine Oxidation Assists Energy‐Efficient Hydrogen Evolution over a Bifunctional Cobalt Perselenide Nanosheet Electrode

Zhang, Junye; Wang, Hongming; Tian, Yufei; Yan, Ya; Xue, Qi; He, Ting; Liu, Hongfang; Wang, Chundong; Chen, Yu; Xia, Bao Yu

doi:10.1002/anie.201803543

Cited by 360 publications

(153 citation statements)

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“…[1] Thee lectrolysis of water involves two half reactions: the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER), for which highly efficient electrocatalysts,s uch as Pt for the HER and IrO 2 for the OER, are usually required. [2,3] However,t he low abundance and high cost of noble-metal catalysts significantly hinder their large-scale commercialization. [4] Therefore,i ti si mperative to develop highly efficient nonprecious bifunctional electrocatalysts for both the HER and OER using the same electrolyte.…”

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confidence: 99%

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

et al. 2019

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Herein, we demonstrate the use of heterostructures comprised of Co/β‐Mo2C@N‐CNT hybrids for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline electrolyte. The Co can not only create a well‐defined heterointerface with β‐Mo2C but also overcomes the poor OER activity of β‐Mo2C, thus leading to enhanced electrocatalytic activity for HER and OER. DFT calculations further proved that cooperation between the N‐CNTs, Co, and β‐Mo2C results in lower energy barriers of intermediates and thus greatly enhances the HER and OER performance. This study not only provides a simple strategy for the construction of heterostructures with nonprecious metals, but also provides in‐depth insight into the HER and OER mechanism in alkaline solution.

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confidence: 99%

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

et al. 2019

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Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Ouyang

et al. 2019

Angewandte Chemie

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Herein, we demonstrate the use of heterostructures comprised of Co/b-Mo 2 C@N-CNT hybrids for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline electrolyte.T he Co can not only create awell-defined heterointerface with b-Mo 2 Cbut also overcomes the poor OER activity of b-Mo 2 C, thus leading to enhanced electrocatalytic activity for HER and OER. DFT calculations further proved that cooperation between the N-CNTs,Co, and b-Mo 2 Cr esults in lower energy barriers of intermediates and thus greatly enhances the HER and OER performance.T his study not only provides asimple strategy for the construction of heterostructures with nonprecious metals,but also provides indepth insight into the HER and OER mechanism in alkaline solution.Electrochemical conversion of H 2 Oi nto hydrogen fuel (2 H 2 O!2H 2 + O 2 )h as attracted great attention from the scientific community because of its potential to replace fossil fuels. [1] Thee lectrolysis of water involves two half reactions: the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER), for which highly efficient electrocatalysts,s uch as Pt for the HER and IrO 2 for the OER, are usually required. [2,3] However,t he low abundance and high cost of noble-metal catalysts significantly hinder their large-scale commercialization. [4] Therefore,i ti si mperative to develop highly efficient nonprecious bifunctional electrocatalysts for both the HER and OER using the same electrolyte. [5,6] Recently,m any earth-abundant, noble-metal-free catalysts for the half-cell reactions have been explored as potential substitutes.S pecifically,t ransition-metal-based carbides, [7] sulfides, [8] phosphides, [9] and selenides [10] exhibit optimum catalytic performance for the HER, and it has been established that molybdenum carbide (Mo 2 C) has excellent HER activity in both acidic and basic electrolytes because the d-band electronic structure of Mo is similar to that of the noble metal Pt. [11][12][13] Notably,t he combination of Mo 2 Cw ith transition metals can effectively reduce the amount of unoccupied dorbitals of Mo to further enhance the HER activity,o wing to the electron-rich nature of transition metals.A lthough Mo 2 C-based materials with superior HER properties have been widely reported, their low OER activity has become am ajor obstacle for overall water splitting.T od ate,t he investigation of Mo 2 C-based electrocatalysts for OER has been limited. In this context, Yu and co-workers synthesized Ni/Mo 2 Cn anorods coated with apolydopamine hybrid, which required an overpotential (h 10 ) of over 368 mV to reach ac urrent density of 10 mA cm À2 , [14] and Luo and co-workers reported aMo 2 C/carbon hybrid that required an h 10 value over 500 mV. [15] Thea bove results suggest that the development of an efficient Mo 2 C-based electrocatalyst to create aw ater electrolyzer is still ac onsiderable challenge. [16] Cobalt-based hybrids can greatly improve the OER catalytic activity of materials,i ncluding Co-N, [17] Co-...

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“…Very recently, Xia's group demonstrated the anodic HzOR assisted energy-efficient H 2 evolution over a bifunctional CoSe 2 nanosheet electrode. [100] Tubular CoSe 2 nanosheets were grown on Ni foam substrate via a two-step hydrothermal method. The as-grown CoSe 2 featured tubular structure, which composed of dense, interconnected nanosheets assemble on the outer walls of the tubes.…”

Section: Coupling Her With Hydrazine Oxidation Reactionmentioning

confidence: 99%

Recent Advances in Electrochemical Hydrogen Production from Water Assisted by Alternative Oxidation Reactions

2019

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Water electrolysis has been considered a promising avenue for ultrapure hydrogen production. However, the energy efficiency of conventional water electrolysis technologies is severely hampered by the kinetic limitations of the anodic oxygen evolution reaction (OER). Over the past decade, an innovative hybrid water electrolysis strategy of replacing the OER with more facile oxidation reactions and coupling with the cathodic hydrogen evolution reaction (HER) has been developed and demonstrated its utility of addressing the critical challenges in conventional water electrolysis. In this Review, we summarize the recent progress concerning electrochemical hydrogen production from water through hybrid water electrolysis technology, with special emphasis on the selection of electrocatalysts and alternative anodic oxidation reactions as well as the related mechanisms involving in electrochemical reactions. Finally, the current challenges and some perspectives are also discussed for the future development of hybrid water electrolysis technology.

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Anodic Hydrazine Oxidation Assists Energy‐Efficient Hydrogen Evolution over a Bifunctional Cobalt Perselenide Nanosheet Electrode

Cited by 360 publications

References 57 publications

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Recent Advances in Electrochemical Hydrogen Production from Water Assisted by Alternative Oxidation Reactions

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Anodic Hydrazine Oxidation Assists Energy‐Efficient Hydrogen Evolution over a Bifunctional Cobalt Perselenide Nanosheet Electrode

Cited by 360 publications

References 57 publications

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo2C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo2C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo2C Nanoparticles as Bifunctional Electrodes for Water Splitting

Recent Advances in Electrochemical Hydrogen Production from Water Assisted by Alternative Oxidation Reactions

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Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting

Heterostructures Composed of N‐Doped Carbon Nanotubes Encapsulating Cobalt and β‐Mo₂C Nanoparticles as Bifunctional Electrodes for Water Splitting