Active-Site-Rich 1T-Phase CoMoSe₂Integrated Graphene Oxide Nanocomposite as an Efficient Electrocatalyst for Electrochemical Sensor and Energy Storage Applications

Abstract

The presence of defect/distortion on layered structure of metal chalcogenides facilitate the higher electronic conductivity and electrocatalytic activity. In this work, we have successfully synthesized Co-doped MoSe2(CoMoSe2, Co2MoSe2, Co3MoSe2, and Co4MoSe2) in 1T phase crystal structure by using hydrothermal technique and integrated with graphene oxide (GO). Various analytical techniques such as TEM, STEM, FESEM, XRD, RAMAN, EDX, ICP, and XPS confirmed the formation of 1T phase and defective sites on Co-doped MoSe2. Consequently, the relevant electrochemical studies were followed and reported the significant enhancement in electrocatalytic activity of MoSe2 due to the Co doping and GO hybridization. The proposed GO@CoMoSe2 electrocatalyst was developed to an electrode material for electrochemical sensor and supercapacitor applications. As expected, the GO@CoMoSe2 modified glassy carbon electrode exhibited an excellent electrocatalytic activity toward the sensing of Metol (LOD, 0.009 μM; sensitivity, 2.397 μA μM–1 cm–2). Meanwhile, GO@CoMoSe2-coated nickel foam (NF) achieved feasible specific capacity (431.47 C g–1). In addition, the GO@CoMoSe2//AC asymmetric device exhibited the feasible energy density of 58.32 W h kg–1 at power density of 1800.25 W kg–1. Thus, we concluded that the Co doping and GO hybridization with MoSe2 provide the interesting idea to find out the excellent electrocatalysts with improved electrochemical performances toward the sensing and battery type supercapacitor applications.

Facile Synthesis of Ag/AgVO3/N-rGO Hybrid Nanocomposites for Electrochemical Detection of Levofloxacin for Complex Biological Samples Using Screen-Printed Carbon Paste Electrodes

“…The obtained recovery value was calculated and compared to the spiked concentrations of the samples. Figure S8A–D shows the oxidation peak currents obtained for (A) human blood serum samples with a linear regression of I pa = 0.23 (LEV (μM)) + 5.255 and with a coefficient correlation R 2 = 0.9936, (B) human urine with a linear regression of I pa = 0.3244 (LEV (μM)) + 1.595 and with a coefficient correlation R 2 = 0.9947, (C) pharmaceutical tablets with a linear regression of I pa = 0.2092­(LEV (μM)) + 8.615 and with a coefficient correlation R 2 = 0.9975, and (D) wastewater with a linear regression of I pa = 0.3165 (LEV (μM)) + 2.52 and with a coefficient correlation R 2 = 0.9988, respectively. , Figure A–C shows the DPV response in the presence of LEV in human blood serum, human urine, and wastewater, respectively. The recovery percentages of different samples were compared with DPV and HPLC analysis in order to verify the standardized electrochemical analysis as shown in Table S1.…”

Innovation of Novel Stone-Like Perovskite Structured Calcium Stannate (CaSnO3): Synthesis, Characterization, and Application Headed for Sensing Photographic Developing Agent Metol

“…Numerous analytical methods like photolysis, the Fenton reagent, spectrometric techniques, and electrochemical techniques were developed for the determination of MT. Among the analytical methods, the electrochemical technique was selected for the detection of MT due to its high sensitivity, simplicity, cost-efficiency, time-consumption, and ability for the selective determination of MT. − …”

Bimetallic CoSe2/FeSe2 hollow nanocuboids assembled by nanoparticles as a positive electrode material for a high-performance hybrid supercapacitor

“…9C and Table S1 †). 2,[71][72][73][74] In the next step, the cycle life of the CoSe 2 /FeSe 2 HNCs@NiF||AC@NiF device was evaluated with 10 000 continuous GCD cycles at a current density of 20 A g −1 (Fig. 9D).…”