Pt-like Hydrogen Evolution Electrocatalysis on PANI/CoP Hybrid Nanowires by Weakening the Shackles of Hydrogen Ions on the Surfaces of Catalysts

Feng, Jin‐Xian; Tong, Si-Yao; Tong, Yexiang; Li, Gao‐Ren

doi:10.1021/jacs.7b12968

Cited by 436 publications

(263 citation statements)

References 55 publications

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“…Among them, metal phosphides have been extensively investigated as high‐performance electrocatalysts for HER, showing low overpotential and small tafel slope in the acidic media 11. Recently, they were also reported as promising electrocatalysts for OER under the alkaline conditions 12.…”

Section: Introductionmentioning

confidence: 99%

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

et al. 2018

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Industrial application of overall water splitting requires developing readily available, highly efficient, and stable oxygen evolution electrocatalysts that can efficiently drive large current density. This study reports a facile and practical method to fabricate a non‐noble metal catalyst by directly growing a Co‐Fe Prussian blue analogue on a 3D porous conductive substrate, which is further phosphorized into a bifunctional Fe‐doped CoP (Fe‐CoP) electrocatalyst. The Fe‐CoP/NF (nickel foam) catalyst shows efficient electrocatalytic activity for oxygen evolution reaction, requiring low overpotentials of 190, 295, and 428 mV to achieve 10, 500, and 1000 mA cm−2 current densities in 1.0 m KOH solution. In addition, the Fe‐CoP/NF can also function as a highly active electrocatalyst for hydrogen evolution reaction with a low overpotential of 78 mV at 10 mA cm−2 current density in alkaline solution. Thus, the Fe‐CoP/NF electrode with meso/macropores can act as both an anode and a cathode to fabricate an electrolyzer for overall water splitting, only requiring a cell voltage of 1.49 V to afford a 10 mA cm−2 current density with remarkable stability. This performance appears to be among the best reported values and is much better than that of the IrO2‐Pt/C‐based electrolyzer.

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Section: Introductionmentioning

confidence: 99%

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

et al. 2018

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“…[9,10] Element doping would be an effective method to improve the catalytic activities, such as doping Ni atoms in MoS 2 . [11][12][13][14][15] As for tuning the morphology, constructing 2D TMS nanosheets could generate abundant electroactive sites because of inherent large specific surface and rich active edges. [11][12][13][14][15] As for tuning the morphology, constructing 2D TMS nanosheets could generate abundant electroactive sites because of inherent large specific surface and rich active edges.…”

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confidence: 99%

Defect‐Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

et al. 2019

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Designing and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify the active sites and promote the electronic transfer, leading to the improved splitting efficiency. Herein, free‐standing and defect‐rich heterogeneous MoS 2 /NiS 2 nanosheets for overall water splitting are designed. The abundant heterogeneous interfaces in MoS 2 /NiS 2 can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions. Consequently, the optimal MoS 2 /NiS 2 nanosheets show the enhanced electrocatalytic performances as bifunctional electrocatalysts for overall water splitting. This study may open up a new route for rationally constructing heterogeneous interfaces to maximize their electrochemical performances, which may help to accelerate the development of nonprecious electrocatalysts for overall water splitting.

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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. [4] Therefore,i ti si mperative to develop highly efficient nonprecious bifunctional electrocatalysts for both the HER and OER using the same electrolyte. [4] Therefore,i ti si mperative to develop highly efficient nonprecious bifunctional electrocatalysts for both the HER and OER using the same electrolyte.…”

mentioning

confidence: 99%

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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Pt-like Hydrogen Evolution Electrocatalysis on PANI/CoP Hybrid Nanowires by Weakening the Shackles of Hydrogen Ions on the Surfaces of Catalysts

Cited by 436 publications

References 55 publications

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

Defect‐Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

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

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Pt-like Hydrogen Evolution Electrocatalysis on PANI/CoP Hybrid Nanowires by Weakening the Shackles of Hydrogen Ions on the Surfaces of Catalysts

Cited by 436 publications

References 55 publications

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

Fe‐CoP Electrocatalyst Derived from a Bimetallic Prussian Blue Analogue for Large‐Current‐Density Oxygen Evolution and Overall Water Splitting

Defect‐Rich Heterogeneous MoS2/NiS2 Nanosheets Electrocatalysts for Efficient Overall Water Splitting

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

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Defect‐Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

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