Abstract
Herein, we have reported a novel composite of nitrogen doped reduced graphene oxide (N-rGO) and strontium zirconate (SrZrO3). This new composite (N-rGO/SrZrO3) was synthesized using the reflux method. The physicochemical properties of N-rGO/SrZrO3 were determined using different advanced techniques such XRD, FE-SEM, EDX, FTIR and BET. Furthermore, a glassy carbon electrode was modified with N-rGO/SrZrO3 (GCE-2). This modified electrode was employed for the sensing of HQ. The electrochemically active surface area (ECSA) of this modified electrode (GCE-2) was calculated by employing the Randles–Sevcik equation. Furthermore, GCE-2 exhibited a good detection limit (0.61 μM) including high selectivity towards HQ.
Highlights
Hydroquinone (HQ) which is a di-substituted phenol (1,4dihydroxybenzene) compound has been extensively employed in various elds.[1,2,3] HQ exists in the environment as a toxic pollutant and its degradation is difficult under ecological circumstances.[4,5] HQ has negative impacts on the environment and human health.[5]
Graphene oxide (GO) was synthesized according to our previous report.[33 50] mg of GO was dispersed in deionized (D.I.) water and sonicated for 2 h at RT. 1.0 gm of urea was added to the GO and stirred for 30 min. 0.48 gm of Sr(OH)2$8H2O was added to the GO dispersion, followed by the addition of 0.538 gm of ZrOCl2$8H2O with continuous stirring at RT
The X-ray diffraction (XRD) examinations con rmed the formation of SrZrO3 and all the diffraction peaks were found to be well-matched with previous JCPDS card no 44-0161
Summary
Hydroquinone (HQ) which is a di-substituted phenol (1,4dihydroxybenzene) compound has been extensively employed in various elds (dyes, cosmetics, photo-stabilizers, pharmaceuticals, oil-re nery, plasticizers, pesticides, textile etc.).[1,2,3] HQ exists in the environment as a toxic pollutant and its degradation is difficult under ecological circumstances.[4,5] HQ has negative impacts on the environment and human health.[5]. The charge transfer, presence of surface electrochemically active sites and surface morphology in uence the performance of the electrochemical sensing devices.[18] In some cases, transition metal oxides may suffer from poor conductivity and this phenomenon restricts their electrochemical applications. To address such issues, reduced graphene has been employed as a promising conductive support for poorly semiconducting metal oxides.[19] some research groups created active sites inside reduced graphene oxide by doping atoms into the graphene matrix.[18] it is of great interest to design and develop new electrode materials with a unique surface morphology for electrochemical sensors
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