Three-dimensional bimetal TMO supported carbon based electrocatalyst developed via dry synthesis for hydrogen and oxygen evolution

Elayappan, Vijayakumar; Ramakrishnan, S.; Sathiskumar, Chinnusamy; Yoo, Dong Jin; Gopiraman, Mayakrishnan; Kım, Kihyun; Noh, Hyun Sung; Kim, Min Kyung; Lee, Haigun

doi:10.1016/j.apsusc.2019.144642

Cited by 64 publications

(19 citation statements)

References 71 publications

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“…The abundance, price and diverse redox activity of copper have attracted particular interest [1][2][3][4] and many copper complexes have been used as photosensitizers [5,6] redox mediators [7,8] and catalysts for CO 2 reduction [9,10] and water oxidation [11][12][13]. Several Cu-based H 2 evolution heterogeneous [14][15][16] electrocatalysts with good performance have been reported, involving Cu(0), Cu 2 O [17][18][19][20][21][22], and Cu2S [23] materials. However, there are only a few examples of molecular copper catalysts with well-defined, rationally tunable structures and a comprehensive H 2 formation mechanism.…”

Section: Introductionmentioning

confidence: 99%

Reactivity and Mechanism of Photo- and Electrocatalytic Hydrogen Evolution by a Diimine Copper(I) Complex

et al. 2020

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The tetrahedral copper(I) diimine complex [Cu(pq)2]BF4 displays high photocatalytic activity for the H2 evolution reaction with a turnover number of 3564, thus representing the first type of a Cu(I) quinoxaline complex capable of catalyzing proton reduction. Electrochemical experiments indicate that molecular mechanisms prevail and DFT calculations provide in-depth insight into the catalytic pathway, suggesting that the coordinating nitrogens play crucial roles in proton exchange and hydrogen formation.

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Section: Introductionmentioning

confidence: 99%

Reactivity and Mechanism of Photo- and Electrocatalytic Hydrogen Evolution by a Diimine Copper(I) Complex

et al. 2020

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“…The main aim is to find an electrode material with better kinetics and stability during electrochemical reactions. Most studies are focused on nanomaterials containing Ru, Ir, and Rh nanoparticles [ 6 ], transition metal-based catalysts, e.g., transition-metal oxides (TMOs) [ 7 ], hydro(oxy)oxides [ 8 ], perovskites [ 9 ], spinels [ 10 ], metal monoxide structures, for instance, transition-metal dichalcogenides (TMDs) [ 11 ], nitrides (TMNs) [ 12 ] and phosphides (TMPs) [ 13 ], and non-metallic compounds [ 14 ]. Among TMOs with chemical formula AB 2 O 4 and cubic crystallographic structure (especially CoMn 2 O 4 , FeMn 2 O 4 , NiCo 2 O 4 , NiMn 2 O 4 and ZnCo 2 O 4 ) have been claimed as promising anode materials for electrochemical use, e.g., LIBs, supercapacitors, and electrocatalysts mainly in OER [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

et al. 2020

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The renewable energy technologies require electrocatalysts for reactions, such as the oxygen and/or hydrogen evolution reaction (OER/HER). They are complex electrochemical reactions that take place through the direct transfer of electrons. However, mostly they have high over-potentials and slow kinetics, that is why they require electrocatalysts to lower the over-potential of the reactions and enhance the reaction rate. The commercially used catalysts (e.g., ruthenium nanoparticles—Ru, iridium nanoparticles—Ir, and their oxides: RuO2, IrO2, platinum—Pt) contain metals that have poor stability, and are not economically worthwhile for widespread application. Here, we propose the spinel structure of nickel-cobalt oxide (NiCo2O4) fabricated to serve as electrocatalyst for OER. These structures were obtained by a facile two-step method: (1) One-pot solvothermal reaction and subsequently (2) pyrolysis or carbonization, respectively. This material exhibits novel rod-like morphology formed by tiny spheres. The presence of transition metal particles such as Co and Ni due to their conductivity and electron configurations provides a great number of active sites, which brings superior electrochemical performance in oxygen evolution and good stability in long-term tests. Therefore, it is believed that we propose interesting low-cost material that can act as a super stable catalyst in OER.

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“…Although the HER performance of [NiO/ ZnO]-GNH/Ni-foam catalyst is not satisfactory as compared to OER, but it can be improved by tuning the morphology and working conditions of the electro catalyst. In a study by Elayappan et al (69), NCGC electro-catalyst was found to be producing 74 mF cm −2 of double layer capacitance indicating the presence of higher extent of the active sites and thus gave rise to enhanced HER and OER electro-catalytic reactions (69).…”

Section: Electrochemical Investigationmentioning

confidence: 98%

Semi-conducting Ni/Zn nano-hybrids’ driven efficient electro-catalytic performance: fabrication, characterization, and electrochemical features’ elucidation

Zahra

Ahmad

Zequine

et al. 2021

Green Chemistry Letters and Reviews

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The current work reports the synthesis, analytical evaluation, and electrochemical performance investigation of green bio-factories' triggered mixed metal oxides' nano-hybrids comprising of nickel (Ni) and zinc (Zn) for the first time. Modified sol-gel synthetic route used for the synthesis of NiO/ZnO green nano-hybrids ([NiO/ZnO]-GNH) is devoid of utilization of any chemical-reducing agents. Efficient [NiO/ZnO]-GNH electro-catalysts were characterized for various aspects using Fourier transform infra-red spectroscopy (FT-IR), gas chromatography and mass spectrometry (GC-MS), energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron micrographs (FE-SEM), UV-Visible spectrophotometry (UV-Vis), and X-ray photoelectron spectroscopy (XPS). Oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) steps of water splitting reactions were evaluated via linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) via fabrication of modified Ni-foam electrode through decoration of [NiO/ZnO]-GNH. The as-synthesized [NiO/ZnO]-GNH promises electrocatalytic performance with a small over-potential of 0.42 V and 264 mV for OER and HER, respectively, for the achievement of a current density of 10 mA/cm 2 . Results of the current work can be extended to the practical scale adoption of the fabricated electro-catalysts through optimized investigation and economical evaluation for the consolidation of environmental sustainability and green energy production.

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Three-dimensional bimetal TMO supported carbon based electrocatalyst developed via dry synthesis for hydrogen and oxygen evolution

Cited by 64 publications

References 71 publications

Reactivity and Mechanism of Photo- and Electrocatalytic Hydrogen Evolution by a Diimine Copper(I) Complex

Reactivity and Mechanism of Photo- and Electrocatalytic Hydrogen Evolution by a Diimine Copper(I) Complex

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Semi-conducting Ni/Zn nano-hybrids’ driven efficient electro-catalytic performance: fabrication, characterization, and electrochemical features’ elucidation

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