3D-Flower-Like Copper Sulfide Nanoflake-Decorated Carbon Nanofragments-Modified Glassy Carbon Electrodes for Simultaneous Electrocatalytic Sensing of Co-existing Hydroquinone and Catechol

Abstract

A copper sulfide nanoflakes-decorated carbon nanofragments-modified glassy carbon electrode (CuS-CNF/GCE) was fabricated for the electrocatalytic differentiation and determination of hydroquinone (HQ) and catechol (CC). The physicochemical properties of the CuS-CNF were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. The electrocatalytic determination of HQ and CC over the CuS-CNF/GCE was evaluated by cyclic voltammetry and differential pulse voltammetry. An excellent detection limit and sensitivity of the CuS-CNF/GCE are obtained (0.293 µM and 0.259 µM) with a sensitivity of 184 nA µM−1 cm−2 and 208 nA µM−1 cm−2 (S/N=3) for HQ and CC, respectively. In addition, the CuS-CNF/GCE shows a selective identification of HQ and CC over potential interfering metal ions (Zn2+, Na+, K+, NO3−, SO42−, Cl−) and organic compounds (ascorbic acid, glucose), and a satisfactory recovery is also obtained in the spiked water samples. These results suggest that the CuS-CNF/GCE can be used as an efficient electrochemical sensor for the simultaneous determination of co-existing environmental pollutants such as HQ and CC in water environments with high selectivity and acceptable reproducibility.

Ultrafast and Ultrastable Heteroarchitectured Porous Nanocube Anode Composed of CuS/FeS2 Embedded in Nitrogen‐Doped Carbon for Use in Sodium‐Ion Batteries

“…[ 46 ] These observations indicate that the chemical bonding states of the metal sulfide particles in the heteroarchitectured nanocubes are similar to those observed in CuS and FeS 2 in previous studies. [ 43,44 ] Furthermore, the formation of the nitrogen‐doped carbon framework was confirmed by the C 1s and N 1s spectra (Figure S5, Supporting Information). In conjunction with the peak at 285.9 eV (C–N) in the C 1s spectrum (Figure S5a, Supporting Information), [ 46 ] the three peaks corresponding to pyridinic N (398.7 eV), pyrrolic N (401.2 eV), and graphitic N (404.7 eV) in the N 1s spectrum (Figure S5b, Supporting Information) demonstrate that nitrogen was doped into the carbon networks derived from the bimetallic PBA precursor.…”

“…The two sharp peaks at 932.5 and 952.2 eV in the Cu 2p spectrum (Figure 3b) are typical Cu (II) binding energy values. [ 42,43 ] Moreover, in the Fe 2p spectrum (Figure 3c), two distinct peaks related to Fe 2p 3/2 and Fe 2p 1/2 were observed at 707.4 and 720.1 eV, respectively, which suggests the existence of divalent Fe (Fe 2+ ). [ 44 ] The S 2p binding energy spectrum (Figure 3d) can be deconvoluted into four dominant peaks located at 162.3, 162.7, 163.6, and 164.4 eV, which correspond to S 2– and S 2 2– , respectively.…”

Electrodeposited Alginate‐Based Green Synthesis of CuS Nanoparticles and Nanocomposite Films for Electrochemical and Colorimetric Detection

“…In Figure a, compared with the CV curves of the control bare electrode and the alginate modified electrode, the CV curve of the CuS NPs/alginate nanocomposite film modified electrode has a clear reduction peak current at 0.25 V, which is attributed to the oxidation peak of HQ. [ 45 ] In addition, the peak current at 0.45 V is related to the oxidation of Cu(I). [ 46 ] Figure 5b shows DPV curves of the CuS NPs/alginate nanocomposite film modified electrode in the presence of HQ with different concentrations.…”

Electrochemical Detection of Dihydroxybenzene Isomers at a Pencil Graphite Based Electrode

“…To overcome these defects, numerous efforts have been made to investigate new electrode materials capable of detecting HQ, CC, and RS simultaneously, which include glassy carbon electrode (GCE) modified with allura red polymeric film, multiwalled carbon nanotubes (MWCNTs), MWCNTs/poly­(1,5-diaminonaphthalene) composite film, MWCNTs/ionic liquid (IL) gel, Au nanoparticles (NPs) loaded on poly-3-amino-5-mercapto-1,2,4-triazole-MWCNTs film, AuNPs/sulfonated grapheme, poly amidosulfonic acid/MWCNTs, reduced graphene oxide/magnetite NPs/AuNPs composite, graphene–chitosan composite film, poly­(1,5-diaminonaphthalene), aspartic acid, tyrosinase immobilization with ordered mesoporous C–Au/L-lycine membrane/Au NPs, 3D-flower-like copper sulfide nanoflake-decorated carbon nanofragments, activated phosphate buffer solution (PBS), MWCNT/AgNPs, polyglutamic acid, 2-(phenylazo) chromotropic acid-(CH−) conducting polymer, electrochemically reduced grapheme oxide-poly­(Eriochrome black T)/Au NPs, poly­( p -aminobenzoic acid), tyrosinase/Au NPs encapsulated-dendrimer bonded conducting polymer, self-assembled Ti 3 C 2 /MWCNTs nanocomposites, C/Au nanostructured materials, graphene oxide/polymelamine composite, carbon nanocoils/zinc-tetraphenylporphyrin nanocomposite, nitrogen doped porous carbon nanopolyhedrons-MWCNTs hybrid materials, thionine/graphene oxide, gel of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIHP)/MWCNTs, ammonium carbamate, poly­(malachite green)/MWCNT film, carboxy-functionalized CNTs/chitosan matrix/Au Nps, Pd NPs/poly­(1,5-diaminonaphthalene) matrix; pencil graphite electrode (PGE) modified with CNTs, BIHP, poly­(direct yellow 11), cobalt-phthalocyanine; mesoporous Pd electrode, poly­(crystal violet); flexible screen printed carbon electrode; graphene sheets embedded carbon films; poly­(adenine)/graphene paste electrode; carbon ionic liquid electrode modified with graphene, Au NPs/graphene; gold electrode modified with gold atomic cluster-poly­(3,4-ethylenedioxidethiophene) nanocomposite, etc. However, it remains challenging to investigate novel electrode materials for simultaneous detection of DHBIs with a wide linear range and higher sensitivity.…”