Influence of the Oxide Content in the Catalytic Power of Raney Nickel in Hydrogen Generation

Delgado, Dario; Minakshi, Manickam; Kim, Dong-Jin; W, Chung Kyeong

doi:10.1080/00032719.2017.1300806

Cited by 22 publications

(16 citation statements)

References 37 publications

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“…It can be seen that a porous and continuous film of Raney NiOx is formed on the Ni disk. This is in agreement with our previous work [43,47] with this type of sample using a similar synthesis and preparation procedure. Energy dispersive X-Ray spectroscopy indicates an atom percentage of ca.…”

Section: Sem Micrographs and Elemental Eds Analysissupporting

confidence: 93%

“…Raney Ni was prepared by the method described in our previous publication . Figure S5 depicts a schematic of the electrocatalyst preparation process.…”

Section: Methodsmentioning

confidence: 99%

“…Raney Ni was prepared by the method described in our previous publication. [43] Figure S5 depicts a schematic of the electrocatalyst preparation process. Ni particles were electrodeposited onto a Ni substrate by a Watts bath.…”

Section: Preparation Of Raney Nimentioning

confidence: 99%

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Accelerated Durability Test for High‐Surface‐Area Oxyhydroxide Nickel Supported on Raney Nickel as Catalyst for the Alkaline Oxygen Evolution Reaction

et al. 2019

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We demonstrate a fit‐for‐purpose accelerated durability test (ADT) of a high‐surface‐area catalyst for the alkaline oxygen evolution reaction (OER). Using an automatized electrochemical setup enabled us to run a complex ADT protocol including online detection of the effective solution resistance as well as linear voltammetry, cyclic voltammetry, cyclic galvanograms, and electrochemical impedance spectroscopy (EIS) for 55 h in total. Using this protocol, we tested the service life stability of a nickel oxyhydroxide (NiOx) catalyst based on Raney Ni. The catalyst was prepared by growing nickel oxyhydroxide on high‐surface‐area Raney Ni and subsequent formation of the active phase. The successful synthesis of the active NiOx phase is supported by cyclic voltammetry and Raman spectroscopy. The as prepared and activated Raney NiOx exhibits an overpotential for the OER of 304 mV at 10 mA cm−2 with a Tafel slope of 53 mV dec−1 and roughness factors as high as 4515 determined by EIS during OER. By concentrating for the ADT protocol on current densities relevant for coupling water electrolysis to photovoltaics, it is demonstrated that Raney NiOx is a promising anode material candidate as it is earth abundant and its active phase exhibits high OER activity as well as stability.

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Section: Sem Micrographs and Elemental Eds Analysissupporting

confidence: 93%

“…Raney Ni was prepared by the method described in our previous publication . Figure S5 depicts a schematic of the electrocatalyst preparation process.…”

Section: Methodsmentioning

confidence: 99%

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Accelerated Durability Test for High‐Surface‐Area Oxyhydroxide Nickel Supported on Raney Nickel as Catalyst for the Alkaline Oxygen Evolution Reaction

et al. 2019

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“…As can be observed, the values of Tafel slope (b) obtained for the synthesized samples range from 126 to 140 mV/dec, indicating that HER proceeds via the Volmer-Heyrosky mechanism [44,55]; similar values were reported in the literature for porous Ni-based samples also in presence of copper [46,48]. Both samples S 1-5 and S 0.01-0.5 present exchange current density values considerably higher with respect to the commercial nickel, indicating a considerable improvement of the apparent electrocatalytic properties of the fabricated electrodes.…”

Section: Resultsmentioning

confidence: 74%

Porous Ni Photocathodes Obtained by Selective Corrosion of Ni-Cu Films: Synthesis and Photoelectrochemical Characterization

et al. 2019

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In this work, a dealloying technique is proposed as a synthesis method to obtain highly porous Nickel electrodes starting from Ni-Cu co-deposit: pulsed corrosion is applied adopting different corrosion and relaxation times. Different morphologies, pore size distribution and residual copper amount were obtained depending on the corrosion conditions. For the developed electrodes, the surface roughness factor, Rf, was evaluated by electrochemical impedance spectroscopy (EIS). The hydrogen evolution reaction (HER) on these electrodes was evaluated by means of steady-state polarization curves, and the related parameters were derived by Tafel analysis. Finally, a thin layer of NiO on the porous structures was obtained to exploit the semiconductor characteristic of the oxide, so that an extra-photopotential was obtained by the simulated solar light action. Results demonstrate greater apparent activity of the developed electrodes towards HER in comparison with commercial smooth Ni electrode, which can be mainly attributed to the large Rf obtained with the proposed technique.

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“…Hence, it is clear that adding Fe impurities into Ni-based catalysts is positive for both OER and HER, although the anode and cathode possess different interface behaviors for water electrolysis. Up to now, a variety of NiFe-based electrocatalysis has been investigated [12][13][14][15]; however, there still exists a significant controversy over the catalytically active metal redox state and electron transfer pathways [16][17][18][19][20]. To explore the complete mechanism, different kinds of characterization, e.g., in-situ spectroscopy and density functional theory (DFT) calculations, have been carried out to identify the pathways for the catalytic reactions [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets

Qiu

Niklasson

et al. 2021

Physchem

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Mixed nickel-iron (Ni-Fe) compounds have recently emerged as promising non-precious electrocatalysts for alkaline water splitting. The understanding of the charge-transfer mechanism involved in the multi-step Faradic reaction, however, is still limited for the overall electrochemical process. In this paper, electrochemical impedance spectroscopy (EIS) measurements of Fe incorporated Ni oxide nanosheets were used to study the reaction kinetics for both hydrogen (HER) and oxygen (OER) evolution reactions in alkaline media. Our results showed that Fe incorporation improves the catalytic property of NiO nanosheets because of the lower reaction resistance and faster intermediate transformations. Detailed EIS modeling enables a separation of the surface coverage relaxation from the charge transfer resistance, with an inductive behavior observed in the low-frequency range for HER, holding important information on the dominating reaction mechanism. For OER, the good agreement between the EIS experimental results and a model with an inductance loop indicated that similar inductive behavior would be determining the EIS response at very low frequencies. The physical significance of the elementary steps gives insight into the governing reaction mechanisms involved in the electron and hole charge transfer, as well as the inherent properties of catalysts and their surface coverage relaxation.

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Influence of the Oxide Content in the Catalytic Power of Raney Nickel in Hydrogen Generation

Cited by 22 publications

References 37 publications

Accelerated Durability Test for High‐Surface‐Area Oxyhydroxide Nickel Supported on Raney Nickel as Catalyst for the Alkaline Oxygen Evolution Reaction

Accelerated Durability Test for High‐Surface‐Area Oxyhydroxide Nickel Supported on Raney Nickel as Catalyst for the Alkaline Oxygen Evolution Reaction

Porous Ni Photocathodes Obtained by Selective Corrosion of Ni-Cu Films: Synthesis and Photoelectrochemical Characterization

An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets

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