Hydrogen Evolution Reaction in Alkaline Media: Alpha- or Beta-Nickel Hydroxide on the Surface of Platinum?

Yu, Xiaowen; Zhao, Jun; Zheng, Lirong; Yue, Tong; Zhang, Miao; Xu, Guochuang; Li, Chun; Ma, Jing; Shi, Gaoquan

doi:10.1021/acsenergylett.7b01103

Cited by 268 publications

(201 citation statements)

References 36 publications

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“…The promotion was ascribed to a synergistic effect between Ni(OH) 2 and metals where Ni(OH) 2 facilitate the water dissociation, and the generated hydrogens were subsequently adsorbed and associated on metal surfaces. In 2017, Yu et al studied the relationship between the promoted alkaline HER activity and the structure of Ni(OH) 2 by loading α‐Ni(OH) 2 and β‐Ni(OH) 2 on Pt electrode . Both experimental and theoretical results proved that β‐Ni(OH) 2 was a better promoter for the alkaline HER on Pt due to the higher water dissociation ability and stronger interactions between β‐Ni(OH) 2 and Pt.…”

Section: Heterostructured Catalysts For Hermentioning

confidence: 99%

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Zhao

Rui

Dou

et al. 2018

Adv Funct Materials

1,053

708

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Developing sustainable and renewable energy sources along with efficient energy storage and conversion technologies is vital to address environmental and energy challenges. Electrochemical water splitting coupling with gridscale renewable energy harvesting technologies is becoming one of the most promising approaches. Besides, hydrogen with the highest mass-energy density of any fuel is regarded as the ultimate clean energy carrier. The realization of practical water splitting depends heavily on the development of low-cost, highly active, and durable catalysts for hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs). Recently, heterostructured catalysts, which are generally composed of electrochemical active materials and various functional additives, have demonstrated extraordinary electrocatalytic performance toward HER and OER, and particularly a number of precious-metalfree heterostructures delivered comparable activity with precious-metal-based catalysts. Herein, an overview is presented of recent research progress on heterostructured HER catalysts. It starts with summarizing the fundamentals of HER and approaches for evaluating HER activity. Then, the design and synthesis of heterostructures, electrochemical performance, and the related mechanisms for performance enhancement are discussed. Finally, the future opportunities and challenges are highlighted for the development of heterostructured HER catalysts from the points of view of both fundamental understandings and practical applications.

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Section: Heterostructured Catalysts For Hermentioning

confidence: 99%

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Zhao

Rui

Dou

et al. 2018

Adv Funct Materials

1,053

708

View full text Add to dashboard Cite

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“…In the case of Ni 2p, two major peaks are detected at 857.2 and 874.8 eV, which belong to the spin orbit of Ni 2p 3/2 and Ni 2p 1/2 , respectively. These two peaks have an energy separation of 17.6 eV, and are accompanied by two shake‐up satellites, which are characteristic for the formation of Ni(OH) 2 . The distinction between the XPS spectra of NiCoFe/NF and NiCo/NF is observed in the Fe 2p spectrum, where NiCo/NF shows a broad and insidious peak, indicating the absence of Fe element in this composite.…”

Section: Resultsmentioning

confidence: 95%

“…These two peaks have an energy separation of 17.6 eV, and are accompanied by two shake-up satellites, which are characteristic for the formation of Ni(OH) 2 . 43,44 The distinction between the XPS spectra of NiCoFe/NF and NiCo/NF is observed in the Fe 2p spectrum, where NiCo/NF shows a broad and insidious peak, indicating the absence of Fe element in this composite. By contrast, in the NiCoFe/NF composite, the Fe 2p peak can be fitted into the Fe 2p 3/2 and Fe 2p 1/2 spin orbit at 712 and 725 eV, respectively, with a minor shake-up satellite in-between.…”

Section: Electrodeposition and Physical Characterizationsmentioning

confidence: 99%

Reversible ternary nickel‐cobalt‐iron catalysts for intermittent water electrolysis

Zhang

et al. 2020

EcoMat

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Global‐scale application of water splitting technology for hydrogen fuel production and storage of intermittent renewable energy sources such as solar and wind has called for the development of oxygen evolution catalysts and hydrogen evolution catalysts that are inexpensive, efficient, robust, and can withstand frequent power interruptions and shutdowns. Current water electrolyzers must operate with a protective current in stand‐by/idle modes to avoid a substantial catalyst degradation. Here, we show a hierarchically structured porous ternary composite catalyst of nickel, cobalt and iron (NiCoFe) hydroxides prepared via electrodeposition on three‐dimensional (3D) nickel foam (NF) substrates as reversible bifunctional electrodes for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The NiCoFe/NF electrode exhibits exceptionally high catalytic activity, requiring overpotentials as low as 220 and 50 mV, respectively, for OER and HER to occur. In a water electrolysis cell comprising of two NiCoFe/NF electrodes, an overall cell overpotential of merely 300 mV is required to deliver a stabilized current density of 3 mA cm−2. The ternary electrocatalyst also exhibits prolonged stability under both continuous and intermittent electrolysis and can be used for oxygen evolution and hydrogen evolution reversibly without degradation.

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“…The Ni 2p 3/2 XPS spectrum from Ni(OH) 2 has two obvious satellite intensities fit by broad peaks with binding energy at main line 852.0 eV (Table ). The peaks have been deconvoluted into two contributions with binding energies at 855.8 eV and 861.4 eV . The first peak can be assigned to the isolated Ni II species.…”

Section: Resultsmentioning

confidence: 99%

Novel Efficient Pd‐Free Ni‐Layered Double Hydroxide Catalysts for a Suzuki C–C Coupling Reaction

et al. 2019

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The Suzuki cross‐coupling reaction has developed as one of the foremost effectual approaches for the synthesis of biaryls or substituted aromatic moieties from aryl halides and arylboronic acids with a palladium‐catalyst in the past two eras. In this study, Pd‐free layered double hydroxides (LDHs) nickel‐containing catalysts were prepared by a coprecipitation method under ultrasonic irradiation and N2 atmosphere with different molar ratios of Ni:Mg:Al and coded as (1NiLDHs−Dr), (1.5NiLDHs−Dr) and (2NiLDHs−Dr). A series of reduced catalysts under 5% H2/N2 at 200 °C were coded as 1NiLDHs−R200, 1.5NiLDHs−R200 and 2NiLDHs−R200. Deep investigation of all catalysts was done using different techniques such as inductively coupled plasma optical emission spectroscopy (ICP‐OES), X‐ray photoelectron spectroscopy (XPS), powder X‐ray diffraction (XRD), thermogravimetric analyses (TGA), Fourier transfer infrared (FTIR), scanning electron microscopy (SEM) connected with energy dispersive X‐ray (EDX), transmission electron microscopy (TEM) and N2‐physisorption at –196 °C. The results attained verified that ɑ‐Ni(OH)2 was fashioned for a 2NiLDHs−Dr catalyst and that the enclosure of nickel ions in the cationic sheet of the layered structure was responsible for the fascinating catalytic efficacy rather than the basic nature of material. The Ni‐containing LDHs catalysts encourage forthcoming studies in Pd‐free catalyzed C−C coupling reactions.

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Hydrogen Evolution Reaction in Alkaline Media: Alpha- or Beta-Nickel Hydroxide on the Surface of Platinum?

Cited by 268 publications

References 36 publications

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Heterostructures for Electrochemical Hydrogen Evolution Reaction: A Review

Reversible ternary nickel‐cobalt‐iron catalysts for intermittent water electrolysis

Novel Efficient Pd‐Free Ni‐Layered Double Hydroxide Catalysts for a Suzuki C–C Coupling Reaction

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