Boosting the electrochemical performance of mesoporous NiCo2O4 oxygen evolution catalysts by facile surface modifying

He, Xiwen; Huang, Yunpeng; Sun, Xiaoqin; Du, Peng; Zhao, Zebi; Wang, R. Y.; Yang, Han; Wang, Y.; Huang, Kai

doi:10.1007/s00339-020-04017-z

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…These peaks are consistent with those assigned to Ni 2+ cations in Co x Ni y O z materials. , The O 1s spectra show a broad, convoluted peak with major O contributions centered at 529.7, 531.2, and 533.2 eV binding energies. These peaks are attributed, respectively, to oxygen existing as adsorbed −OOH, −(OH) 2 , and other adsorbed water-like species at the metal surface. − In general, our XPS measurements are consistent with those from other reported Co 2 NiO 4 spinel materials …”

Section: Resultssupporting

confidence: 89%

Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

et al. 2022

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The electrochemical reduction of CO 2 and H 2 O to solar fuels remains a promising strategy for storing intermittent energy sources in the form of chemical bonds. These electrochemical reductions occurring at the cathode typically are coupled to the oxygen evolution reaction at the anode. The electrochemical oxidation of organic alcohols in the alcohol oxidation reaction is a promising alternative anode reaction that occurs at decreased operating potentials compared to the oxygen evolution reaction and that produces more valuable products than O 2 . Co 2 NiO 4 is a particularly promising catalyst for the oxidation of alcohols, able to promote alcohol oxidation at current densities of 10 mA cm −2 at potentials of only 1.42 V vs reversible hydrogen electrode (RHE) in alkaline aqueous conditions, significantly less positive than typical potentials required for the oxygen evolution reaction. In this work, we study the alcohol oxidation reaction by Co 2 NiO 4 for a series of straight-chain primary alcohols of increasing chain length from ethanol to n-pentanol. We show that the product distribution for alcohol oxidation depends on the alcohol chain length, changing from primarily aldehyde products for shorter-chain alcohols to primarily carboxylic acid products for longer-chain alcohols. These results suggest that alcohols are oxidized sequentially to first aldehydes and then carboxylic acids at Co 2 NiO 4 . During the oxidation of longer-chain alcohols, the aldehyde intermediates are retained at the catalyst surface for longer times, facilitating further oxidation to terminal carboxylic acid products. We also explored the potential-dependent activities and product distributions for nbutanol oxidation at Co 2 NiO 4 , and showed that alcohol oxidation is able to outcompete chloride oxidation in aqueous solutions containing Cl − at seawater concentrations. These studies provide further insight into the alcohol oxidation reaction at Co 2 NiO 4 and highlight its promise as an alternative anode reaction for the production solar fuels.

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Section: Resultssupporting

confidence: 89%

Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

et al. 2022

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“…As shown in Fig. 3f, in the F 1s spectra of the as-reacted sample, the signal found at 685.9 eV can be assigned to FeF 3 , 28 which is consistent with the XRD results. The peak of FeF 3 disappears in the SC CO 2 -Ti 3 C 2 T x multilayer MXenes and the delaminated flakes; nevertheless, they preserve two other peaks corresponding to C–Ti–F x and C–F 3 .…”

Section: Resultssupporting

confidence: 87%

Supercritical CO₂-assisted solid-phase etching preparation of MXenes for high-efficiency alkaline hydrogen evolution reaction

et al. 2023

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“…Unfortunately, the high cost, poor durability, together with low reserve, largely hinder their widespread application [9,[13][14][15][16]. Accordingly, it is urgent to develop earth-abundant OER catalysts as alternatives to noble metal oxides [17][18][19][20][21]. Recently, transition metal phosphides (TMPs), distinguishing featured the superiorities of low-cost, high conductivity, efficient transfer of mass, and electrons as promising electrocatalysts, have been appealed to wide interests for electrochemical water splitting as the ideal candidates for OER.…”

Section: Introductionmentioning

confidence: 99%

Co-Cu-P nanosheet-based open architecture for high-performance oxygen evolution reaction

Wang

Huang

et al. 2021

Appl. Phys. A

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The exploration of earth-abundant electrocatalysts and insight on the relationship between their activity and structure is challenging for large-scale electrochemical water oxidation. Herein, 2D Co-Cu-P nanosheets on Ni foam are fabricated by electrodeposition and subsequent phosphorization process. The Co-Cu-P nanosheets are highly interconnected to form an open-structured hierarchical network structure, which endows the product large surface area, efficient mass transportation, and fast gas releasing. In addition, the surface of Co-Cu-P would rapidly convert into hydroxides layer in the earlier oxygen evolution reaction (OER) process, which preserves the Co-Cu-P phosphide inside and serves as the real active sites for OER process. Benefiting from the rationally designed open-structured hierarchical network and the synergistic effect from the two kinds of metal cations with high conductivity, the resultant Co-Cu-P bimetal phosphide open-structured network delivers superb OER performance with an overpotential of 240 mV to drive a current density of 10 mA cm −2 in alkaline medium, outperforming the performance of the Co-P and Cu 3 P monometallic phosphide counterpart. This work provides a simple synthesis approach to construct bimetal phosphide with a rationally designed open-structured hierarchical network toward boosting electrocatalytic OER performance.

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Boosting the electrochemical performance of mesoporous NiCo2O4 oxygen evolution catalysts by facile surface modifying

Cited by 7 publications

References 13 publications

Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Supercritical CO₂-assisted solid-phase etching preparation of MXenes for high-efficiency alkaline hydrogen evolution reaction

Co-Cu-P nanosheet-based open architecture for high-performance oxygen evolution reaction

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Boosting the electrochemical performance of mesoporous NiCo2O4 oxygen evolution catalysts by facile surface modifying

Cited by 7 publications

References 13 publications

Electrochemical Oxidation of Primary Alcohols Using a Co2NiO4 Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Electrochemical Oxidation of Primary Alcohols Using a Co2NiO4 Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Supercritical CO2-assisted solid-phase etching preparation of MXenes for high-efficiency alkaline hydrogen evolution reaction

Co-Cu-P nanosheet-based open architecture for high-performance oxygen evolution reaction

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Product

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Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Electrochemical Oxidation of Primary Alcohols Using a Co₂NiO₄ Catalyst: Effects of Alcohol Identity and Electrochemical Bias on Product Distribution

Supercritical CO₂-assisted solid-phase etching preparation of MXenes for high-efficiency alkaline hydrogen evolution reaction