Pencil graphite rods decorated with nickel and nickel–iron as low-cost oxygen evolution reaction electrodes

Arcas, Ramón; Koshino, Yuuki; Mas‐Marzá, Elena; Tsuji, Ryuki; Masutani, Hideaki; Miura-Fujiwara, Eri; Haruyama, Yuichi; Nakashima, Seiji; Ito, Seigo; Fabregat‐Santiago, Francisco

doi:10.1039/d1se00351h

Cited by 9 publications

(17 citation statements)

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“…10,17 In addition to the NiOOH studies, metallic nickel has attracted great attention recently due to its high activity and low overpotential. 2,3,18 The fabrication of metallic nickel is much simpler than NiOOH, by which the fabrication techniques of metallic nickel often employ electroreduction and chemical plating. Electroreduction of Ni 2+ to form metallic nickel has been developed on the industrial scale.…”

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confidence: 99%

“…Two oxidized Ni species were identified in both Ni/FTO and NiOOH electrodes: first, Ni 2p 1/2 and 2p 3/2 binding energies are centered at 875.6 and 857.2 eV, indicating the presence of Ni 2+ oxidation states similar to NiO; second, Ni 2p 1/2 and 2p 3/2 binding energies are centered at 873.08 and 855.5 eV indicating a Ni 2+ oxidation state similar to Ni(OH) 2 . Since the XPS method is a surface characterization technique, the (hydro-)oxide determined in the metallic Ni/FTO electrode suggests that the surface of the Ni/FTO electrode was partially oxidized by the atmospheric environment at least within the XPS detection depth (a few nm), consistent with literature reports indicating similar oxidations occurring on the surface of metallic nickel. , The metallic phase of nickel is also observed around 869.75 and 852.50 eV in the as-prepared Ni/FTO electrode; however, such a feature disappeared in the after-OER electrode, suggesting partial oxidation on the metallic nickel surface by the oxygen in the atmosphere and a fully covered oxide layer after OER, also supported by the O 1s XPS spectra in Figure S2a,b. Hence, the surface species for water oxidation in the Ni/FTO in this study is generally assigned to NiO x .…”

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confidence: 99%

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Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Yuan

Guo

et al. 2022

ACS Energy Lett.

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Operando spectroelectrochemistry is employed to identify the electrochemical water oxidation reaction kinetics on metallic nickel in comparison with nickel oxyhydroxide. The nickel oxide on metallic nickel shows a spectroelectrochemical feature of the active species similar to the nickel oxyhydroxide during water oxidation. This amorphous oxide on the surface of metallic nickel is a crucial catalyst exhibiting a higher water oxidation activity in both rate constants and turnover frequency than the electrodeposited nickel oxyhydroxide by 3-fold for water oxidation, using a population-based rate-law analysis. These surface characterization and kinetic results reveal the underlying mechanism of the higher water oxidation efficiency of nickel oxide derived from metallic nickel than that of the electrodeposited nickel oxyhydroxide. These results also emphasize the importance of surface oxidized nickel, in terms of the structural and chemical consideration, for the optimization of electrodes toward efficient water oxidation using nickel or nickel-containing materials.

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confidence: 99%

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confidence: 99%

Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Yuan

Guo

et al. 2022

ACS Energy Lett.

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“…When the difference in current (Δ J ) between anodic and cathodic sweeps at a potential of 0.01 V (Ag/AgCl/3 M KCl) was plotted against the scan rate, a straight line is obtained with the slope which is equal to the double-layer capacitance ( C dl ). The formula used to determine the ECSA is given in eq . Here, C s is the specific capacitance of the glassy carbon electrode (0.174 mF·cm –2 ), taken as ref . The C dl value for Se/PGE was 0.262 mF, and the ECSA for the modified electrode was calculated to be 11.9 cm 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Here, C s is the specific capacitance of the glassy carbon electrode (0.174 mF•cm −2 ), taken as ref 55. The C dl value for Se/PGE was 0.262 mF, and the ECSA for the modified electrode was calculated to be 11.9 cm 2 .…”

Section: Effect Of the Scan Rate For Hydrazine Oxidationmentioning

confidence: 99%

Selenium Nanoneedles Deposited on a Pencil Graphite Electrode for Hydrazine Sensing

Ishtiaq

Sohail

Rasul

et al. 2022

ACS Appl. Nano Mater.

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The low toxicity of Se nanoparticles (NPs) makes it a suitable candidate for biomedical and sensing applications. Herein, we, for the first time, report the modification of a pencil graphite electrode with Se nanostructures (Se/PGE) by a facile chemical bath deposition (CBD) method. Hydrazine, a routine chemical in various industries, is toxic even in trace amounts and poses a serious threat due to its carcinogenic and mutagenic nature. Therefore, it is crucial to detect its presence in aqueous media. The Se/PGE exhibited outstanding, reproducible, and selective electrocatalytic activity for hydrazine determination. The Se/PGE displayed a stable amperometric response with a wide linear concentration range of 1 μM−50 mM, a LOQ of 90 nM, a very low LOD of 45 nM, and a sensitivity of 0.813 μA•μM −1 •cm −2 . Moreover, Se/PGE showed a negligible response toward common interferences like NO 3 −1 , CH 3 COO −1 , phenol, and DMF at the selected applied potential. Applying the as-fabricated sensor for hydrazine detection in real-life samples (drinking water) showed satisfactory results with a recovery percentage of 96.9%. Further, our methodology paves the way to fabricate modified pencil graphite electrodes (PGEs) through a convenient CBD method.

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“…Electropolymerization is another strategy for the immobilization of catalysts that involves the formation of a polymeric film containing the catalyst on the surface of electrodes upon oxidation or reduction. Graphite rods are carbon-based electrodes with low cost, simplicity, and commercial availability. , Considerable research effort has been done on developing electrochemically active polymer materials, including those based on pyrene for its applications in electrochemical energy storage . However, no examples of electropolymerization of pyrene monomers on graphite electrodes are known and, so far, pyrene-based ruthenium aqua complexes have never been anchored on graphite electrodes, nor have the resulting systems been applied as oxidation photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Photoredox Catalysis in Aqueous Environments: Ruthenium Aqua Complex Derivatization of Graphene Oxide and Graphite Rods for Efficient Visible-Light-Driven Hybrid Catalysts

Affès,

Stamatelou,

Fontrodona

et al. 2023

ACS Appl. Mater. Interfaces

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the first time and have proven to be sustainable and easily reusable systems for the photooxidation of alcohols in water, in mild and green conditions. We report here the synthesis and total characterization of two Ru(II)-polypyridyl complexes, the chlorido trans-fac-[RuCl(bpeapyrene)(bpy)](PF 6 ) (trans-fac-2) and the aqua trans-fac-[Ru-(bpea-pyrene)(bpy)OH 2 ](PF 6 ) 2 (trans-fac-3), both containing the N-tridentate, 1-[bis(pyridine-2-ylmethyl)amino]methylpyrene (bpea-pyrene), and 2,2′-bipyridine (bpy) ligands. In both complexes, only a single isomer, the trans-fac, has been detected in solution and in the solid state. The aqua complex trans-fac-3 displays bielectronic redox processes in water, assigned to the Ru(IV/II) couple. The trans-fac-3 complex has been heterogenized on different types of supports, (i) on graphene oxide (GO) through π-stacking interactions between the pyrene group of the bpeapyrene ligand and the GO and (ii) both on glassy carbon electrodes (GC) and on graphite rods (GR) through oxidative electropolymerization of the pyrene group, which yield stable heterogeneous photoredox catalysts. GO@trans-fac-3-and GR/poly trans-fac-3-modified electrodes were fully characterized by spectroscopic and electrochemical methods. Trans-fac-3 and GO@transfac-3 photocatalysts (without a photosensitizer) showed good catalytic efficiency in the photooxidation of alcohols in water under mild conditions and using visible light. Both photocatalysts display high selectivity values (>99%) even for primary alcohols in accordance with the presence of two-electron transfer processes (2e − /2H + ).

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Pencil graphite rods decorated with nickel and nickel–iron as low-cost oxygen evolution reaction electrodes

Abstract: Society is demanding clean energy to substitute the greatly pollutant carbon-based fuels. As an alternative, the green hydrogen produced by electrocatalysis constitutes a nice strategy as its products and reactants...

Cited by 9 publications

References 48 publications

Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Kinetics of Active Oxide Species Derived from a Metallic Nickel Surface for Efficient Electrocatalytic Water Oxidation

Selenium Nanoneedles Deposited on a Pencil Graphite Electrode for Hydrazine Sensing

Enhancing Photoredox Catalysis in Aqueous Environments: Ruthenium Aqua Complex Derivatization of Graphene Oxide and Graphite Rods for Efficient Visible-Light-Driven Hybrid Catalysts

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