Hybridization of Co3S4 and Graphitic Carbon Nitride Nanosheets for High-performance Nonenzymatic Sensing of H2O2

Abstract

The development of efficient H2O2 sensors is crucial because of their multiple functions inside and outside the biological system and the adverse effects that a higher concentration can cause. This work reports a highly sensitive and selective non-enzymatic electrochemical H2O2 sensor achieved through the hybridization of Co3S4 and graphitic carbon nitride nanosheets (GCNNS). The Co3S4 is synthesized via a hydrothermal method, and the bulk g-C3N4 (b-GCN) is prepared by the thermal polycondensation of melamine. The as-prepared b-GCN is exfoliated into nanosheets using solvent exfoliation, and the composite with Co3S4 is formed during nanosheet formation. Compared to the performances of pure components, the hybrid structure demonstrates excellent electroreduction towards H2O2. We investigate the H2O2-sensing performance of the composite by cyclic voltammetry, differential pulse voltammetry, and amperometry. As an amperometric sensor, the Co3S4/GCNNS exhibits high sensitivity over a broad linear range from 10 nM to 1.5 mM H2O2 with a high detection limit of 70 nM and fast response of 3 s. The excellent electrocatalytic properties of the composite strengthen its potential application as a sensor to monitor H2O2 in real samples. The remarkable enhancement of the electrocatalytic activity of the composite for H2O2 reduction is attributed to the synergistic effect between Co3S4 and GCNNS.

Electrochemical Supercapacitor Application of Electrochemically Produced Chlorine-Doped Graphene Oxide with Cobalt Sulfide-Based Compounds Produced from Recycling of Spent Li-Ion Batteries

“…53 Co 2+ in Co 3 S 4 , and Co 3+ appears at 780.6 eV. 54 786.3 and 803.9 eV show two separate satellite peaks. 55 In the S2p spectrum in Fig.…”

MnCo2O4 Spinel Nanorods for Highly Sensitive Electrochemical Detection of Nitrite

“…Each of these peaks can be divided into subpeaks arising from Co 2+ , Co 3+ , and satellite peaks. The Co 2+ component from 2p 1/2 and 2p 3/2 occurs at 796.77 and 781.27 eV, respectively, whereas the Co 3+ contribution occurs at 795.27 eV (2p 1/2 ) and 780.22 eV (2p 3/2 ). , The satellite peaks at 803.21 and 786.18 eV signify the existence of Co 2+ . Thus, the prepared MCO has Co in the mixed valences of 2+/3+, and from the integrated areas, the ratio of Co 2+ /Co 3+ was calculated to be 1.51, suggesting that the majority of Co is present in the 2+ oxidation state in MCO.…”

“…The Co 2+ component from 2p 1/2 and 2p 3/2 occurs at 796.77 and 781.27 eV, respectively, whereas the Co 3+ contribution occurs at 795.27 eV (2p 1/2 ) and 780.22 eV (2p 3/2 ). 55,56 The satellite peaks at 803. . 57,58 The removal of O atoms during the 500 °C calcination process causes vacancy defects.…”

Novel Heterostructure‐Based CoFe and Cobalt Oxysulfide Nanocubes for Effective Bifunctional Electrocatalytic Water and Urea Oxidation

“…As shown in Figure a, the diffraction peaks at 25.01° and 43.31° corresponded to carbon cloth substrate, and the peaks located at 31.25°, 36.81°, 47.19°, and 55.39° can be indexed to the (311), (400), (422), and (440) crystal planes of Co 3 S 4 (JCPDS No. 42–1448), [ 48,49 ] respectively. Notably, the diffraction peak intensity of the heterostructures decreased as the deposition rate of CoFe LDH on the CoOS NCs increased.…”