Hydroxyl radical assisted enzyme-free electrochemical detection and oxidation of cholesterol by a galvanically deposited layer-by-layer ZnO/WO<sub>3</sub> thin film nanocomposite

Ghorui, Uday Kumar; Adhikary, Bibhutosh; Mondal, Anup

doi:10.1039/d3nj00872j

Cited by 2 publications

(1 citation statement)

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“…These results demonstrate that the active sites of the films also increase with integrating area. 57,58 Moreover, the onset potential for the reduction peak appeared at 0.1 V vs RHE for PMO-3.5, whereas this was observed at 0.22 V vs RHE for MO-3.5. This observation clearly indicates that there must be a reduction of H + ions at the cathode.…”

Section: Energy Band Diagram On Overall Watermentioning

confidence: 95%

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Ghorui,

Show,

Roy

et al. 2024

ACS Appl. Mater. Interfaces

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Electrochemical water oxidation is believed to be an effective pathway to produce clean, carbon-free, and environmentally sustainable green energy. In this work, we report a simple, easy-to-construct, facile, lowcost, and single-step galvanic technique to synthesize a Pd-supported temperature-assisted MoO x thin film nanocomposite for effective water oxidation. The most suitable nanocomposite exhibits very low overpotential at 10 mA/cm 2 with smaller Tafel slope values for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) processes in an alkaline medium. The formation of a metal oxide−metal junction accelerates the growth of more active sites, promoting induced electronic synergism at the MoO x −Pd interface. This endows higher electrical conductivity and faster electron transfer kinetics, thus accelerating the faster water dissociation reaction following the Tafel−Volmer mechanism to boost the HER process in an alkaline medium. The excellent electrochemical HER and OER performances of our electrocatalyst even supersede the accomplishments of the benchmark catalysts Pt/C and RuO 2 . Moreover, neither of these two catalysts demonstrates both catalytic reactions, i.e., HER and OER at the same time, which have been observed for our synthesized catalyst. Our findings illustrate the potential of a thin-film MoO x −Pd nanocomposite to be an exceedingly effective electrocatalyst developed by interface engineering strategies. This also provides insight into designing several other semiconductor composite catalysts using simple synthesis techniques for highly efficient HER/OER processes that could be alternatives to benchmark electrocatalysts for water electrolysis.

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Section: Energy Band Diagram On Overall Watermentioning

confidence: 95%

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Ghorui,

Show,

Roy

et al. 2024

ACS Appl. Mater. Interfaces

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Rational Design of Asymmetric Spinel/Defect Spinel (ZnMn₂O₄/Cu_1.5Mn_1.5O₄) Nanocomposite-Based Supercapacitor Devices for Efficient Energy Storage with Improved Cycle Stability

Sivaguru,

Ghorui,

Girirajan

et al. 2024

ACS Appl. Energy Mater.

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The increasing global demand for energy solutions has created the necessity for innovative nanocomposite materials for efficient energy storage applications. This urgency is driving significant advancements in energy storage technologies, raising hope for the future of energy sectors. Supercapacitors (SCs), highperformance electrochemical storage devices, have earned considerable attention to address these challenges. In this article, we have demonstrated a cost-effective, easily obtainable trimetallic spinel/defect-spinel oxide ZnMn 2 O 4 /Cu 1.5 Mn 1.5 O 4 (ZMO/ CMO) nanocomposite through a facile one-step solvothermal synthesis process. This nanocomposite demonstrated exceptional charge storage capabilities. The charge storage mechanism was established by using Dunn's method, which reveals the diffusive nature of the electrode material. The ZMO/CMO nanocomposite exhibits an impressive specific capacitance of 468.1 F/g at 0.5 A/g, with 84% capacity retention even after 20000 cycles, which was attributed to the oxygen vacancies within the defect spinel structure. Moreover, we fabricated an asymmetric device utilizing ZMO/CMO as the cathode and activated carbon (AC) as the anode. This device attained an energy density of 48.1Wh/kg and a power density of 700 W/kg with excellent cycling stability, as mentioned before. Furthermore, our study featured its ability to power a standard LED light.

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Hydroxyl radical assisted enzyme-free electrochemical detection and oxidation of cholesterol by a galvanically deposited layer-by-layer ZnO/WO₃ thin film nanocomposite

Abstract: An accurate and rapid determination of cholesterol levels in bio-fluids is a very considerable fact because it is an important index for the bio-medical diagnosis of several lethal diseases. Accordingly,...

Cited by 2 publications

References 58 publications

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Rational Design of Asymmetric Spinel/Defect Spinel (ZnMn₂O₄/Cu_1.5Mn_1.5O₄) Nanocomposite-Based Supercapacitor Devices for Efficient Energy Storage with Improved Cycle Stability

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Hydroxyl radical assisted enzyme-free electrochemical detection and oxidation of cholesterol by a galvanically deposited layer-by-layer ZnO/WO3 thin film nanocomposite

Abstract: An accurate and rapid determination of cholesterol levels in bio-fluids is a very considerable fact because it is an important index for the bio-medical diagnosis of several lethal diseases. Accordingly,...

Cited by 2 publications

References 58 publications

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO2/MoO3 Composite Thin Film

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO2/MoO3 Composite Thin Film

Rational Design of Asymmetric Spinel/Defect Spinel (ZnMn2O4/Cu1.5Mn1.5O4) Nanocomposite-Based Supercapacitor Devices for Efficient Energy Storage with Improved Cycle Stability

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Hydroxyl radical assisted enzyme-free electrochemical detection and oxidation of cholesterol by a galvanically deposited layer-by-layer ZnO/WO₃ thin film nanocomposite

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Strategically Designed Pd-Induced Changes in Alkaline Hydrogen Evolution Reaction and Oxygen Evolution Reaction Performances of Electrochemical Water Oxidation by the Galvanically Synthesized MoO₂/MoO₃ Composite Thin Film

Rational Design of Asymmetric Spinel/Defect Spinel (ZnMn₂O₄/Cu_1.5Mn_1.5O₄) Nanocomposite-Based Supercapacitor Devices for Efficient Energy Storage with Improved Cycle Stability