High entropy alloy nanoparticle - graphene (HEA:G) composite for non-enzymatic glucose oxidation : optimization for enhanced catalytic performance

• Published in: Carbon trends Vol. 9; p. 100216
• Main Authors: Ashwini, R., Kumar, M.K. Punith, Rekha, M.Y., Santosh, M.S., Srivastava, Chandan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-10-2022; Elsevier
• Subjects: Ball milling; Electro-catalysis; Electrochemistry; High entropy alloy – graphene (HEA:G) composite; Non-enzymatic electrochemical sensor; Electrochemistry; Non-enzymatic electrochemical sensor; Ball milling; High entropy alloy – graphene (HEA:G) composite; Electro-catalysis
• ISSN: 2667-0569; 2667-0569
• DOI: 10.1016/j.cartre.2022.100216

•High entropy alloy (NiCrFeCuCo) nanoparticle – graphene (HEA:G) composite electrochemical behavior and kinetics for non-enzymatic sensing applications.•Different weight percentage ratios of HEA:G composites were produced via simple ball milling technique.•The effect of optimized HEA:G composite in enhancing electrocatalytic behavior and glucose sensitivity.•HEA:G composite as a catalyst material to construct non-enzymatic electrochemical sensors.
High entropy alloy (HEA) metal nanoparticles engineered graphene composites (HEA:G) were produced via green approach involving mechanical milling and sonication assisted exfoliation. Mixture of metal powders and graphite (metal-to-graphite weight ratio: 20%, 50%, 70%, 90%) were ball milled and exfoliated. As produced 20:80, 50:50, 70:30, 90:10 - HEA:G composites electrochemical activity was explored using the redox probe potassium ferricyanide [K3Fe(CN)6] and for the non-enzymatic detection of glucose. From cyclic voltammetry(CV) response, the significant electron transfer kinetics for K3Fe(CN)6 was found for 20:80, 50:50, 70:30 composites, whereas reduced activity was observed with 90:10. Also, 20:80, 50:50, 70:30 composites exhibited notable oxidation of glucose in 0.1 M PBS compared to 90:10. The anodic current indicating oxidation of glucose was found to be increasing linearly with HEA:G composite - 20:80<50:50<70:30. However, DPV measurements indicate better working potential from 0.45 V to 0.4 V followed by saturation in the oxidation currents for 50:50 and 70:30 composites. The sensitivity obtained for HEA:G composites 20:80, 50:50, 70:30 were 12.09 μAmM−1cm−2, 22.99 μAmM−1cm−2, 18.2 μAmM−1cm−2 respectively. Hence, 50:50 and 70:30 are the efficient composites exhibiting excellent catalytic activity indicating the prominence of HEA:Graphene composites and their synergism.
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