Highly active carbon-supported Ni catalyst prepared by nitrate decomposition with a sacrificial agent for the hydrogen oxidation reaction in alkaline medium

Simonov, P.A.; Cherstiouk, Olga V.; Kuznetsov, A. N.; Зайковский, В. И.; Kardash, T. Yu.; Oshchepkov, Alexandr G.; Bonnefont, Antoine; Savinova, Elena R.

doi:10.1016/j.jelechem.2019.113551

Cited by 18 publications

(20 citation statements)

References 35 publications

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“… (a) Ratio of the measured ECSA to the single-particle ECSA (ECSA/(6/ ρd )) and ECSA-normalized exchange current density i 0 for Ni catalysts 60 synthesized by different methods. Abbreviations: ED (1) = electrodeposited Ni/XC-72 catalysts ; 21 I-FD (1) = Ni/XC-72 catalysts by impregnation + freeze-drying ; 23 CR-HT = Ni/XC/72 by chemical reduction + hydrothermal treatment ; 61 I-FD (2) = Ni 0.95 Cu 0.05 /XC-72, impregnation + freeze-drying ; 23 I-CR = Ni/KB, impregnation and chemical reduction, 62 I-TR = Ni 0.95 Cu 0.05 /XC-72, impregnation + thermal reduction ; 2 TR = Ni 9 Mo 1 /KB, thermal reduction ; 15 CR (1) = Ni/N-CNT, chemical reduction + hydrothermal treatment ; 29 I-FD = Ni/KB, impregnation + freeze-drying ; 63 CR-HT = Ni/BC, Ni/NC, Ni/SC, chemical reduction + hydrothermal treatment ; 61 STR = Ni/XC-72, solvothermal synthesis (this work); CR(2) = Ni/VX-CMAX22, chemical reduction (this work); ED (2) = Ni-NiO/XC-72, electrodeposition ; 21 CR (3) = Ni 3 Fe/VX-CMAX22, chemical reduction. 19 (b) ECSA-normalized exchange current density i 0 vs particle size d for the same catalysts as in (a).…”

Section: Resultsmentioning

confidence: 99%

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

Davydova

Manikandan

Dekel

et al. 2021

ACS Appl. Energy Mater.

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The latest progress in alkaline anion-exchange membranes has led to the expectation that less costly catalysts than those of the platinum-group metals may be used in anion-exchange membrane fuel cell devices. In this work, we compare structural properties and the catalytic activity for the hydrogen-oxidation reaction (HOR) for carbon-supported nanoparticles of Ni, Ni 3 Co, Ni 3 Cu, and Ni 3 Fe, synthesized by chemical and solvothermal reduction of metal precursors. The catalysts are well dispersed on the carbon support, with particle diameter in the order of 10 nm, and covered by a layer of oxides and hydroxides. The activity for the HOR was assessed by voltammetry in hydrogen-saturated aqueous solutions of 0.1 mol dm –1 KOH. A substantial activation by potential cycling of the pristine catalysts synthesized by solvothermal reduction is necessary before these become active for the HOR; in situ Raman spectroscopy shows that after activation the surface of the Ni/C, Ni 3 Fe, and Ni 3 Co catalysts is fully reduced at 0 V, whereas the surface of the Ni 3 Cu catalyst is not. The activation procedure had a smaller but negative impact on the catalysts synthesized by chemical reduction. After activation, the exchange-current densities normalized with respect to the ECSA (electrochemically active surface area) were approximately independent of composition but relatively high compared to catalysts of larger particle diameter.

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Section: Resultsmentioning

confidence: 99%

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

Davydova

Manikandan

Dekel

et al. 2021

ACS Appl. Energy Mater.

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“…Finally, chemical methods to measure the surface area, while not giving the exact information about the ECSA, are still useful, because they allow one to calculate the full surface area of Ni. Among various techniques described by Trasatti and Petrii, CO and H 2 chemisorption measurements for metallic Ni, or N 2 physisorption measurements for Ni oxides, can be mentioned. ,− …”

Section: Electrochemical Properties Of Nickel Electrocatalystsmentioning

confidence: 99%

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

et al. 2020

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Nickel is a very abundant transition metal in the Earth crust, and finds numerous applications in electrochemical processes where metallic Ni or its oxides are thermodynamically stable, particularly in alkaline environments. This contribution addresses electrocatalytic properties of Ni-based catalysts in reactions of fuel oxidation in alkaline media. It firstly details the electrochemical behavior of Ni in alkaline media and approaches to determine the active surface area of Ni electrodes. Secondly, the electrocatalytic activities of Ni-based electrocatalysts for the alkaline hydrogen oxidation reaction are described (an endeavor for the development of anion exchange membrane fuel cells), along with a detailed analysis of the strategies put forward to improve them. It is notably shown that the state of Ni surface (oxidized or reduced) largely determines its electrocatalytic activity. This state of the surface also conveys a pivotal importance regarding the activity of Ni for the oxidation of complex fuels (borohydride, boranes and hydrazine). Finally, emphasis is made on the durability of Ni-based catalysts in alkaline environments. It is shown that in such media, the materials durability of Ni-based electrodes can be high, but this does not necessarily warrant stable electrocatalytic activity, owing to possible deactivation following surface oxide or bulk hydride formation in operation.

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“…In addition, pristine Ni is far from ideal to promote water formation and dissociation that is often proposed to be the rate‐determining step (although different views exist) for alkaline HOR and HER [14] . Many strategies have been accordingly developed to modulate the electronic structure of Ni, and tune its interaction with reaction intermediates via, for example, alloying with other metals or nonmetals, [16–18] modifying with metal oxides [19, 20] or coupling with conductive supports [21, 22] . Our group recently demonstrated that the interstitial nitrogen doping in Ni 3 N weakened the *H binding, and enabled active and durable HOR in alkaline solution with excellent mass activity and CO tolerance [16] .…”

Section: Figurementioning

confidence: 99%

“…[14] Many strategies have been accordingly developed to modulate the electronic structure of Ni, and tune its interaction with reaction intermediates via, for example, alloying with other metals or nonmetals, [16][17][18] modifying with metal oxides [19,20] or coupling with conductive supports. [21,22] Our group recently demonstrated that the interstitial nitrogen doping in Ni 3 N weakened the *H binding, and enabled active and durable HOR in alkaline solution with excellent mass activity and CO tolerance. [16] Hu and co-workers reported that the H 2 pyrolysis of Ni-containing metal-organic frameworks gave rise to strained Ni nanoparticles, which under the optimal condition exhibited state-of-the-art mass activity of 50 A g À1 for alkaline HOR at the overpotential (h) of 50 mV.…”

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confidence: 99%

Alloying Nickel with Molybdenum Significantly Accelerates Alkaline Hydrogen Electrocatalysis

Wang,

Yang,

Shi

et al. 2021

Angewandte Chemie

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Bifunctional hydrogen electrocatalysis (hydrogen‐oxidation and hydrogen‐evolution reactions) in alkaline solution is desirable but challenging. Among all available electrocatalysts, Ni‐based materials are the only non‐precious‐metal‐based candidates for alkaline hydrogen oxidation, but they generally suffer from low activity. Here, we demonstrate that properly alloying Ni with Mo could significantly promote its electrocatalytic performance. Ni4Mo alloy nanoparticles are prepared from the reduction of molybdate‐intercalated Ni(OH)2 nanosheets. The final product exhibits an apparent hydrogen‐oxidation activity exceeding that of the Pt benchmark and a record‐high mass‐specific kinetic current of 79 A g−1 at an overpotential of 50 mV. A superior hydrogen‐evolution performance is also measured in alkaline solution. These experimental data are rationalized by our theoretical simulations, which show that alloying Ni with Mo significantly weakens its hydrogen adsorption, improves the hydroxyl adsorption and decreases the reaction barrier for water formation.

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Highly active carbon-supported Ni catalyst prepared by nitrate decomposition with a sacrificial agent for the hydrogen oxidation reaction in alkaline medium

Cited by 18 publications

References 35 publications

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

Effect of the Synthetic Method on the Properties of Ni-Based Hydrogen Oxidation Catalysts

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

Alloying Nickel with Molybdenum Significantly Accelerates Alkaline Hydrogen Electrocatalysis

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