Graphene oxide-Cu(II) composite electrode for non-enzymatic determination of hydrogen peroxide

Solvothermal decoration of Cu3SnS4 on reduced graphene oxide for enhanced electrocatalytic hydrogen evolution reaction

“…Whereas Cu 3 SnS 4 /rGO showed (Figure 2d) that the Cu 3 SnS 4 structures unwound from the regular structure and were uniformly dispersed on the surface of rGO. The observed surface morphology using TEM is clearly distinct from the SEM due to difference in the magnification and also surface functional groups such as hydroxyl, epoxide and carboxylic acid on GO forms complex with Cu 2+ and Sn 4+ ions 3,37,38 . When the reaction temperature increased, these groups dissociate from the surface of carbon layer and react together to form Cu 3 SnS 4 on rGO.…”

“…DMF, which has a nitrogen atom containing lone pair of electrons can be a nucleophile in this system. Also, GO binds certain amount of metal ions through hydroxyl, epoxide, and carboxyl acid functional groups 3,37,38 . When the reaction temperature is increased, the functionalized groups dissociates from the carbon surface in DMF and eventually reacts together to form Cu 3 SnS 4 on carbon layers.…”

Electrochemical Deposition of Copper on Epitaxial Graphene

“…The benefits gained from the interaction between graphene-based materials and copper have been used for reduction of 4-nitrophenol (4-NP) to 4-aminophenol [19,20], oxidation of hydrazine [21,22], electro-oxidation of methanol [23], hydrogen evolution reaction (HER) [24,25], the electrochemical reduction of CO 2 to ethanol [26], oxidative carbonylation of methanol [27], CO 2 cycloaddition to propylene oxide (PO) [28], formic acid synthesis by CO 2 hydrogenation [29] and CO 2 electroreduction for methane and methanol production [30]. Beyond the issue of high-performance catalysts, it is worth mentioning that Cu-Gr composites have also been applied to the electrochemical detection of ascorbic acid and dopamine [31], organophosphorus pesticide [32], heavy metals [33,34], glucose [35][36][37][38][39], chlorophenol pollutants in wastewater [40], hydroquinone and catechol [41], nitrite [42,43], nitrogen dioxide (NO 2 ) [44] and hydrogen peroxide (H 2 O 2 ) [45]. Numerous density functional theory (DFT) calculations shed light on the adsorption of different gases (H 2 S [46,47], CO [48], CO 2 [49] [51][52][53]) and organic molecules [54][55][56] onto Cu-decorated/doped/anchored graphene, thereby providing the solid theoretical background that is required to design efficient sensing devices.…”

Fe3O4 Nanoparticles Loaded on Lignin Nanoparticles Applied as a Peroxidase Mimic for the Sensitively Colorimetric Detection of H2O2

“…Hydrogen peroxide (H 2 O 2 ), as one of the most important reactive oxygen species (ROS), is widely used in the food and chemical industries, clinical medicine, and environmental monitoring [1,2,3]. Studies have shown that long-term exposure to H 2 O 2 can cause serious harm to a person’s health, including poisoning, respiratory inflammation [4], cancer, Alzheimer’s disease, and Parkinson’s disease [5].…”

“…Studies have shown that long-term exposure to H 2 O 2 can cause serious harm to a person’s health, including poisoning, respiratory inflammation [ 4 ], cancer, Alzheimer’s disease, and Parkinson’s disease [ 5 ]. Therefore, the substantial research efforts are devoted to develop methods for the detection of H 2 O 2 ,such ashigh-performance liquid chromatography (HPLC) [ 6 ], electrochemistry [ 1 ], spectrometry [ 7 ], chemiluminescence [ 8 ], and colorimetric assays [ 9 ]. HPLC, electrochemistry, and chemiluminescence methods are sensitive, but their processes are complex and time-consuming.…”