Interfacial electron rearrangement: Ni activated Ni(OH)2 for efficient hydrogen evolution

Zhong, Wenda; Li, Wenlong; Yang, Chi-Hsin; Wu, Jing; Zhao, Ruiqing; Idrees, Memona; Xiang, Hui; Zhang, Qin; Li, Xuanke

doi:10.1016/j.jechem.2021.02.013

Cited by 63 publications

(27 citation statements)

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“…It is widely accepted that a moderate Gibbs free energy for H* adsorption (Δ G H* ) close to zero allows preferable H* adsorption/desorption. [ 49 ] As revealed by Figure 5e, the Δ G H* of Ni/CeO 2 heterojunctions is calculated to be 0.68 eV, which is apparently more thermo‐neutral than those of on Ni (0.91 eV) and CeO 2 (1.18 eV). This finding again affirms that the Ni/CeO 2 heterojunction is more energetically favorable for the HER, therefore exhibiting greatly boosted HER intrinsic activity.…”

Section: Resultsmentioning

confidence: 95%

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Yin

Sun

et al. 2022

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Designing affordable and efficient bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has remained a long‐lasting target for the progressing hydrogen economy. Utilization of metal/semiconductor interface effect has been lately established as a viable implementation to realize the favorable electrocatalytic performance due to the built‐in electric field. Herein, a typical Mott–Schottky electrocatalyst by immobilizing Ni/CeO2 hetero‐nanoparticles onto N‐doped carbon nanofibers (abbreviated as Ni/CeO2@N‐CNFs hereafter) has been developed via a feasible electrospinning‐carbonization tactic. Experimental findings and theoretic calculations substantiate that the elaborated constructed Ni/CeO2 heterojunction effectively triggers the self‐driven charge transfer on heterointerfaces, leading to the promoted charge transfer rate, the optimized chemisorption energies for reaction intermediates and ultimately the expedited reaction kinetics. Therefore, the well‐designed Ni/CeO2@N‐CNFs deliver superior HER and OER catalytic activities with overpotentials of 100 and 230 mV at 10 mA cm‐2, respectively, in alkaline solution. Furthermore, the Ni/CeO2@N‐CNFs‐equipped electrolyzer also exhibits a low cell voltage of 1.56 V to attain 10 mA cm‐2 and impressive long‐term durability over 55 h. The innovative manipulation of electronic modulation via Mott–Schottky establishment may inspire the future development of economical electrocatalysts for diverse sustainable energy systems.

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Section: Resultsmentioning

confidence: 95%

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Yin

Sun

et al. 2022

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103

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“…The hydrogen evolution reaction (HER) from water splitting under large current densities plays a vital role in industrial hydrogen production in that it is an efficient approach to solve the challenges of climate change and meanwhile to achieve carbon neutrality. [1][2][3] Unfortunately, the HER features slow kinetics, especially in alkaline media. Pt-based materials have been thus utilized and further recognized as the most effective HER catalysts, although their high price and scarcity severely restrict widespread and industrial applications of the HER.…”

Section: Introductionmentioning

confidence: 99%

Electrochemically Reconstructed Cu‐FeOOH/Fe₃O₄ Catalyst for Efficient Hydrogen Evolution in Alkaline Media

Yang

Zhong

Shen

et al. 2022

Advanced Energy Materials

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Surface self‐reconstruction via incorporating an amorphous structure on the surface of a catalyst can induce abundant defects and unsaturated sites for enhanced hydrogen evolution reaction (HER) activity. Herein, an electrochemical activation method is proposed to reconstruct the surface of a Cu‐Fe3O4 catalyst. Following a “dissolution–redeposition” path, the defective FeOOH is formed under potential stimulation on the surface of the Cu‐Fe3O4 precursor during the electrochemical activation process. This Cu‐FeOOH/Fe3O4 catalyst exhibits excellent stability as well as extremely low overpotential toward the alkaline HER (e.g., 129 and 285 mV at the large current densities of −100 and 500 mA cm−2, respectively), much superior to the Pt/C catalyst. The experimental and density functional theory calculation results demonstrate that the Cu‐FeOOH/Fe3O4 catalyst has abundant oxygen vacancies, featuring optimized surface chemical composition and electronic structure for improving the active sites and intrinsic activity. Introducing defective FeOOH on the surface of a Cu‐Fe3O4 catalyst by means of an electrochemical activation method decreases the energy barrier of both H2O dissociation and H2 generation. Such a surface self‐reconstruction strategy provides a new avenue toward the production of efficient non‐noble metal catalysts for the HER.

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“…These observations indicated that the binding energy shift may not be the key factor in the HER process. As mentioned above, in addition to the reduction degree and binding energy shift, the band gap values of the samples is a critical parameter for describing the electronic structure difference, which was related to the catalyst conductivity and charge transfer ability [11,54–55] . Co doping induced a decrease in the band gap, consequently lowering the charge transfer resistance and facilitating the dynamic kinetics, resulting in excellent HER activity [56–57] .…”

Section: Resultsmentioning

confidence: 99%

“…As mentioned above, in addition to the reduction degree and binding energy shift, the band gap values of the samples is a critical parameter for describing the electronic structure difference, which was related to the catalyst conductivity and charge transfer ability. [11,[54][55] Co doping induced a decrease in the band gap, consequently lowering the charge transfer resistance and facilitating the dynamic kinetics, resulting in excellent HER activity. [56][57] In contrast, Fe doping increased the band gap, inevitably increasing the charge transfer resistance and decreasing the HER activity.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Electronic Structure of Tungsten Oxide for Enhanced Hydrogen Evolution Reaction in Alkaline Electrolyte

Zhang

et al. 2022

ChemElectroChem

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Engineering the electronic structure of HER catalysts has been suggested to improve the performance of noble metal‐free catalysts in alkaline electrolytes. Herein, we demonstrated that a suitable cation doping in the tungsten oxide catalyst modified the interfacial structure, surface chemical state and band gap value, which enhanced the HER performance. For the experiments, the cation (Ni, Co and Fe) doped tungsten oxide catalysts were synthesized on nickel foam, on which Ni‐based alloy was decorated. The Co doped catalyst (Co−WO) exhibited an extraordinary HER activity, with a low overpotential of 30 mV at a current density of 10 mA cm−2, Tafel slope of 32 mV dec−1. In this system, the Ni‐based alloy–tungsten oxide interface facilitated water dissociation. Moreover, the decreased band gap and improved conductivity induced by Co doping, further enhanced the charge transfer ability in the HER process. The regulated metal‐oxide heterostructure coupled with cation doping endowed the catalyst with efficient interface active sites, superior electrical conductivity, and enhanced electron transfer kinetics, facilitating the HER performance.

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Interfacial electron rearrangement: Ni activated Ni(OH)2 for efficient hydrogen evolution

Cited by 63 publications

References 50 publications

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Electrochemically Reconstructed Cu‐FeOOH/Fe₃O₄ Catalyst for Efficient Hydrogen Evolution in Alkaline Media

Tuning the Electronic Structure of Tungsten Oxide for Enhanced Hydrogen Evolution Reaction in Alkaline Electrolyte

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Interfacial electron rearrangement: Ni activated Ni(OH)2 for efficient hydrogen evolution

Cited by 63 publications

References 50 publications

Manipulation of Mott−Schottky Ni/CeO2 Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Manipulation of Mott−Schottky Ni/CeO2 Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Electrochemically Reconstructed Cu‐FeOOH/Fe3O4 Catalyst for Efficient Hydrogen Evolution in Alkaline Media

Tuning the Electronic Structure of Tungsten Oxide for Enhanced Hydrogen Evolution Reaction in Alkaline Electrolyte

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Product

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Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Manipulation of Mott−Schottky Ni/CeO₂ Heterojunctions into N‐Doped Carbon Nanofibers for High‐Efficiency Electrochemical Water Splitting

Electrochemically Reconstructed Cu‐FeOOH/Fe₃O₄ Catalyst for Efficient Hydrogen Evolution in Alkaline Media