One-step controllable synthesis of amorphous (Ni-Fe)S /NiFe(OH)  hollow microtube/sphere films as superior bifunctional electrocatalysts for quasi-industrial water splitting at large-current-density

Che, Qijun; Li, Qing; Tan, Yen Kheng; Chen, Xinhong; Xu, Xi; Chen, Yashi

doi:10.1016/j.apcatb.2019.01.082

Cited by 198 publications

(58 citation statements)

References 70 publications

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“…5 a LSV curves of OER for investigated samples. b Comparisons of OER overpotentials in this work and reported catalysts [ 8 , 47 , 50 , 53 – 56 ]. c Corresponding Tafel curves.…”

Section: Resultsmentioning

confidence: 99%

“…Although Pt-/Ir-/Ru-based materials are the best choice to accelerate these two half-reactions, the large-scale hydrogen production is still limited by its shortage and high price [ 5 – 7 ]. Therefore, developing highly efficient non-precious metal materials to replace the noble metals for reducing cost and improving the performance of WE are necessary [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

et al. 2021

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Developing highly effective and stable non-noble metal-based bifunctional catalyst working at high current density is an urgent issue for water electrolysis (WE). Herein, we prepare the N-doped graphene-decorated NiCo alloy coupled with mesoporous NiCoMoO nano-sheet grown on 3D nickel foam (NiCo@C-NiCoMoO/NF) for water splitting. NiCo@C-NiCoMoO/NF exhibits outstanding activity with low overpotentials for hydrogen and oxygen evolution reaction (HER: 39/266 mV; OER: 260/390 mV) at ± 10 and ± 1000 mA cm−2. More importantly, in 6.0 M KOH solution at 60 °C for WE, it only requires 1.90 V to reach 1000 mA cm−2 and shows excellent stability for 43 h, exhibiting the potential for actual application. The good performance can be assigned to N-doped graphene-decorated NiCo alloy and mesoporous NiCoMoO nano-sheet, which not only increase the intrinsic activity and expose abundant catalytic activity sites, but also enhance its chemical and mechanical stability. This work thus could provide a promising material for industrial hydrogen production.

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“…5 a LSV curves of OER for investigated samples. b Comparisons of OER overpotentials in this work and reported catalysts [ 8 , 47 , 50 , 53 – 56 ]. c Corresponding Tafel curves.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

et al. 2021

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“…The minimum theoretical voltage to drive OER and HER reaction at room temperature is 1.23 V, but the actual voltage to drive water decomposition is often greater than this due to various reasons, which requires us to use an appropriate catalyst for reducing the voltage of water splitting. [5] Currently, the most active catalyst materials are noble metal-based materials such as Pt for HER, Ir, Ru and their oxides for OER. However, they are greatly limited in industrial applications due to their scarcity and high cost, [6] so there is a great need to design and develop electrocatalysts with better performance and low price.…”

Section: Introductionmentioning

confidence: 99%

Flower‐like Fe‐Co‐M (M=S, O, P and Se) Nanosheet Arrays Grown on Nickel Foam as High‐efficiency Bifunctional Electrocatalysts

Zhang

2021

Chemistry An Asian Journal

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The development of highly efficient, inexpensive, abundant and non-precious metal electrocatalysts is the lifeblood of the hydrogen production industry, especially the hydrogen production industry by electrolysis of water. A Fe-Co-S/NF bifunctional electrocatalyst with nanoflower-like structure was synthesized on three-dimensional porous nickel foam through one-step hydrothermal and one-step hightemperature sulfuration operations, and the material displays high-efficiency electrocatalytic performance. As a catalyst for the hydrogen evolution reaction, Fe-Co-S/NF can drive a current density of 10 mA/cm 2 at an overpotential of 143 mV with a Tafel slope of 80.2 mV/dec. When it was used as an oxygen evolution reaction catalyst, it exhibits good OER reactivity with a low Tafel slope (82.6 mV/dec) and with requiring only 117 mV overpotential to drive current densities up to 50 mA/cm 2 . In addition, the Fe-Co-S/NF//Fe-Co-S/NF electrolytic cell was assembled, an electrolysis voltage of 1.64 V is required to drive a current density of 50 mA/cm 2 , which is one of the most active catalysts reported so far. This work indicates that the introduction of S, P and Se treating processes could effectively improve electrical conductivity of the material and enhance the catalytic activity of the material. This work offers an effective and convenient method for improving the morphology of the catalyst, increasing the surface area of the catalyst and developing high-efficiency and low-cost catalysts.

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“…[1,7,13,14] NiÀ FeÀ S is recently studied as a promising water splitting anode material reaching lower reported overpotential values for OER down to 65 mV. [15][16][17][18][19] It should be noted that this low overpotential was, in part, due to the use of high surface area substrates (Ni foam). [15] Furthermore, NiÀ FeÀ S can be used in seawater based electrolytes without forming chlorine.…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23] Literature is currently in disagreeing on the stability of NiÀ FeÀ S, however. [15][16][17][18][19] Many state that the material is stable, [16][17][18][19] though despite the claims of stability an significant increase of about 150 mV is seen over 200 h of continuous operation. [16] The described mode of instability is S destabilization in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Basicity and Electrolyte Composition Dependent Stability of Ni‐Fe‐S and Ni‐Mo Electrodes during Water Splitting

Wijten¹,

García-Torregrosa²,

Dijkman³

et al. 2020

ChemPhysChem

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Non‐noble metal electro‐catalysts for water splitting are highly desired when we are moving towards a society where green electrons are becoming abundantly available, offering clear prospects to make our society more sustainable. In this work, Ni−Fe−S is reported as a high performing anode material for the water splitting reaction, operating at low overpotentials and showing high apparent stability. Furthermore, Ni−Mo electrodes are developed on metallic foam substrates and optimized in terms of their performance. The Ni−Fe−S material as anode, combined and integrated with Ni−Mo as cathode in a cell configuration, splits water at 10 mA cm−2 and a potential of 1.55 V. Similar to previous reports, we confirm that Mo leaches from Ni−Mo/Ni foam electrodes. Cycling tests and ICP‐AES measurements show that the stability of Ni−Fe−S is apparent, and that in reality S is leaching from the material as was already suggested in literature. We expand on this knowledge and show that the leaching of S is dependent on both pH and the cation used during electrocatalysis. Furthermore, we find that applying an oxidative potential is in truth stabilizing towards S and that the alkalinity causes leaching. S was furthermore mobile and found to segregate towards the surface. Finally, using too low pH values (11 and lower) result in the passivating hydroxide metal layers being destroyed and the Ni−Fe−S dissolving completely.

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One-step controllable synthesis of amorphous (Ni-Fe)S /NiFe(OH) hollow microtube/sphere films as superior bifunctional electrocatalysts for quasi-industrial water splitting at large-current-density

Cited by 198 publications

References 70 publications

N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

Flower‐like Fe‐Co‐M (M=S, O, P and Se) Nanosheet Arrays Grown on Nickel Foam as High‐efficiency Bifunctional Electrocatalysts

Basicity and Electrolyte Composition Dependent Stability of Ni‐Fe‐S and Ni‐Mo Electrodes during Water Splitting

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