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Gold Doping Induced Strong Enhancement of Carbon Quantum Dots Fluorescence and Oxygen Evolution Reaction Catalytic Activity of Amorphous Cobalt Hydroxide

Abstract

Water splitting using electrocatalysts is expected to provide an alternative green energy source to meet increasing energy demands as well as addressing environmental concern of fossil fuels. Herein, we report one-step synthesis of sulfur, nitrogen and Au-doped carbon quantum dots (Au-SCQDs) and strong enhancement fluorescence intensity and oxygen evolution reaction (OER) catalytic activity of amorphous Co(OH)2 nanoparticles compared to pure Co(OH)2 as well as commercial RuO2 and Pt/C catalyst. Au doping into sulfur and nitrogen co-doped CQDs showed more than seventy times enhanced fluorescence. OER studies of amorphous-Co(OH)2 incorporated Au-SCQDs produced current density of 178 mA/cm2 at the applied potential of 2.07 V whereas un-doped Co(OH)2 showed current density of 59 mA/cm2. To produce geometric current density of 10 mA/cm2, amorphous Co(OH)2-Au-SCQDs (CSA) required 388-456 mV overpotential depends on the Au ion concentration used for preparing Au-SCQDs that is equal or lower overpotential required by commercial electrocatalyst. The strongly enhanced OER activity of Co(OH)2-Au-SCQDs (CSA) was attributed to the presence of electronegative metallic conducting Au atoms along with high catalytic surface area of amorphous Co(OH)2. The present studies demonstrate a new method of exploiting amorphous Co(OH)2NPs electrocatalysts that could provide more catalytically active site via integrating electronegative conducting Au atoms doped SCQDs matrix.

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Publication details

The article was received on 31 Aug 2018, accepted on 01 Oct 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04429E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Gold Doping Induced Strong Enhancement of Carbon Quantum Dots Fluorescence and Oxygen Evolution Reaction Catalytic Activity of Amorphous Cobalt Hydroxide

    M. P and P. P. Anthony, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04429E

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