Electrocatalytic methanol oxidation over Cu, Ni and bimetallic Cu-Ni nanoparticles supported on graphitic carbon nitride

Pieta, Izabela S.; Rathi, Anuj K.; Pieta, Piotr; Nowakowski, Robert; Hołdyński, Marcin; Pisarek, Marcin; Kamińska, Agnieszka; Gawande, Manoj B.; Zbořil, Radek

doi:10.1016/j.apcatb.2018.10.072

Cited by 265 publications

(181 citation statements)

References 70 publications

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“…For example, NiCu nanoparticles supported on titaniumn itride (Ni-Cu(0.5:1)/TiN) showed an anodic current density of 106.8 mA cm À2 (vs. Ag/AgCl). [67] Bimetallic Ni 2 Co 2 synthesized by an electrodeposition methods howed ac urrentd ensity of 58 mA cm À2 (vs. Ag/AgCl), [52] which is half that of our work, althoughw eu sed the same metal elements. More importantly, the mass activity of Ni 0.6 Co 0.4 is far higher than that of commercial Pt/C (Table S3).…”

Section: Methodsmentioning

confidence: 52%

Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Que

Yao

et al. 2020

ChemSusChem

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Highly active Ni‐based catalysts have attracted much attention but are still facing challenges owing to the immature synthetic method. Herein, polyhedral NixCo1−x alloy was prepared by a facile modified polyol method in which a trace amount of water could halve the particle size of the alloy. The Ni/Co ratios in NixCo1−x alloy strictly depended on the used amount of water owing to the different solubilities of the precursors. Among them, the Ni0.6Co0.4 nanoparticles obtained with 70 μL of deionized water exhibited the best performance in the methanol oxidation reaction with a peak current density of 116 mA cm−2 in the presence of 1 m NaOH+0.5 m CH3OH solution, which is higher than those of Ni0.7Co0.3 (80 mA cm−2) and Ni0.5Co0.5 (33 mA cm−2). The excellent performance of Ni0.6Co0.4 is attributed to the unique structure with appropriate Ni/Co ratio, which elongates the C−O bond in methanol and lowers the reaction free energy according to DFT calculations.

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Section: Methodsmentioning

confidence: 52%

Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Que

Yao

et al. 2020

ChemSusChem

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“…A g‐C 3 N 4 sample with hybrid heterojunction was prepared by a two‐step synthesis. First, 0.6 wt % Ni was loaded on g‐C 3 N 4 by a solution method generating a precursor; second, 0.6 wt % Ag was loaded on the precursor by photodeposition and labeled as Ni/C 3 N 4 /Ag. As comparison, 1.2 wt % Ni‐loaded C 3 N 4 labeled as Ni/C 3 N 4 and 1.2 wt % Ag‐loaded C 3 N 4 labeled as Ag/C 3 N 4 were prepared by solution method and photodeposition, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…As presented in Figure a, the high‐resolution XPS spectrum for the Ni region of Ni/C 3 N 4 /Ag shows a signal at 852.5 eV, corresponding to Ni 2p 3/2 , a peak at 870.0 eV belonging to Ni 2p 1/2 , and a peak at 859.5 eV belonging to a Ni 2p 3/2 satellite . According to previous reports, the Ni 2p 3/2 peak of Ni/C 3 N 4 /Ag was shifted towards lower binding energy values by 0.3–0.4 eV, indicating that Ni nanoparticles loaded on C 3 N 4 probably act as electron acceptors under our experimental conditions . The spectrum of Ag 3d for Ni/C 3 N 4 /Ag in Figure b shows that the peaks located at 367.4 and 373.5 eV can be assigned to Ag 3d 5/2 and Ag 3d 3/2 , respectively .…”

Section: Methodsmentioning

confidence: 99%

Design of C₃N₄‐Based Hybrid Heterojunctions for Enhanced Photocatalytic Hydrogen Production Activity

Yan

Jiang

et al. 2020

ChemSusChem

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Semiconductors and metals can form an Ohmic contact with an electric field pointing to the metal, or a Schottky contact with an electric field pointing to the semiconductor. If these two types of heterojunctions are constructed on a single nanoparticle, the two electric fields may cause a synergistic effect and increase the separation rate of the photogenerated electrons and holes. Metal Ni and Ag nanoparticles were successively loaded on the graphitic carbon nitride (g‐C3N4) surface by precipitation and photoreduction in the hope of forming hybrid heterojunctions on single nanoparticles. TEM/high‐resolution TEM images showed that Ag and Ni were loaded on different locations on C3N4, which indicated that during the photoreduction reaction Ag+ obtained electrons from C3N4 in the reduction reaction, whereas oxidation reactions proceeded on Ni nanoparticles. Photocatalytic hydrogen production experiments showed that C3N4‐based hybrid heterojunctions can greatly improve the photocatalytic activity of materials. The possible reason is that two heterojunctions could form a long‐range electric field similar to the p‐i‐n structure in semiconductors. Most of the photogenerated carriers were generated and then separated in this electric field, thereby increasing the separation rate of electrons and holes. This further improved the photocatalytic activity of C3N4.

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“…As a consequence, the morphological structure and composition of transition metal oxides having a spinel structure are considered for methanol oxidation . As a non‐Pt catalyst, NiCo 2 O 4 is structurally stable, electrochemically very active, with excellent electrical conductivity, and rich oxide‐reduction deriving from nickel and cobalt . Inspired by these properties, NiCo 2 O 4 catalyst is expected to be a promising catalyst for methanol oxidation reaction .…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide Supported NiCo₂O₄ Nano‐Rods: An Efficient, Stable and Cost‐Effective Electrocatalyst for Methanol Oxidation Reaction

Narayanan

Neppolian

2019

ChemCatChem

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The development of inexpensive, highly active and non-noble catalysts for the methanol oxidation reaction is extremely desirable for the practical use of direct-methanol fuel cells. Here, we have developed a template-free hydrothermal synthesis followed by calcination to produce highly active hybrid material of reduced graphene oxide (rGO) supported NiCo 2 O 4 (NiCo 2 O 4 /rGO) nano-rods as a non-expensive electro-catalyst for methanol oxidation. The electrochemical performance of the prepared NiCo 2 O 4 /rGO spinel catalyst was investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) techniques. Impressively, the NiCo 2 O 4 /rGO showed greater electrocatalytic activity (78 mA/ cm 2 ) and stability during methanol oxidation in comparison to that of the commercial Pt/C catalyst, which was 3.11 folds higher than the commercial Pt/C (25.08 mA/cm 2 ). The NiCo 2 O 4 / rGO electrode also maintained its remarkable catalytic stability even after consecutive 500 cycles, which was~50 times higher than that of the commercial Pt/C. The overall electroactivity of NiCo 2 O 4 /rGO was remarkably enhanced by the synergistic effect between NiCo 2 O 4 and rGO. This may be due to the formation of mixed-valence cations of Ni 2 + and Co 3 + from the octahedral sites and high electron-transfer conductivity of rGO as well.[a] N.

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Electrocatalytic methanol oxidation over Cu, Ni and bimetallic Cu-Ni nanoparticles supported on graphitic carbon nitride

Cited by 265 publications

References 70 publications

Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Design of C₃N₄‐Based Hybrid Heterojunctions for Enhanced Photocatalytic Hydrogen Production Activity

Reduced Graphene Oxide Supported NiCo₂O₄ Nano‐Rods: An Efficient, Stable and Cost‐Effective Electrocatalyst for Methanol Oxidation Reaction

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Electrocatalytic methanol oxidation over Cu, Ni and bimetallic Cu-Ni nanoparticles supported on graphitic carbon nitride

Cited by 265 publications

References 70 publications

Unusual Effect of Trace Water on the Structure and Activity of NixCo1−x Electrocatalysts for the Methanol Oxidation Reaction

Unusual Effect of Trace Water on the Structure and Activity of NixCo1−x Electrocatalysts for the Methanol Oxidation Reaction

Design of C3N4‐Based Hybrid Heterojunctions for Enhanced Photocatalytic Hydrogen Production Activity

Reduced Graphene Oxide Supported NiCo2O4 Nano‐Rods: An Efficient, Stable and Cost‐Effective Electrocatalyst for Methanol Oxidation Reaction

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Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Unusual Effect of Trace Water on the Structure and Activity of Ni_xCo_1−x Electrocatalysts for the Methanol Oxidation Reaction

Design of C₃N₄‐Based Hybrid Heterojunctions for Enhanced Photocatalytic Hydrogen Production Activity

Reduced Graphene Oxide Supported NiCo₂O₄ Nano‐Rods: An Efficient, Stable and Cost‐Effective Electrocatalyst for Methanol Oxidation Reaction