Dual functional SILAR deposited NiWO4 electrocatalyst for non-enzymatic glucose sensing and hydrogen evolution reaction

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2023-07, Vol.129 (7), Article 524
• Main Authors: Jadhav, S. B., Malavekar, D. B., Patil, D. J., Pujari, S. S., Patil, U. M., Lokhande, C. D., Pawaskar, P. N.
• Format: Article
• Language: English
• Subjects: Applied physics; Characterization and Evaluation of Materials; Condensed Matter Physics; Electrocatalysts; Glucose; Hydrogen evolution reactions; Machines; Manufacturing; Materials science; Nanocrystals; Nanotechnology; Nickel compounds; Optical and Electronic Materials; Physics; Physics and Astronomy; Porous materials; Processes; Stainless steels; Substrates; Surfaces and Interfaces; Thin Films; Tungstates; Water splitting
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-023-06798-5

An effective route towards improving the electrocatalytic performance of materials is the synthesis of nanocrystalline, porous, and layer-structured materials. Herein, porous nickel tungstate (NiWO 4 ) film electrode was prepared on stainless steel (SS) substrate by inexpensive successive ionic layer adsorption and reaction (SILAR) method. This method provides a binder-free, porous, and nanocrystalline thin layer on a SS substrate. The electrocatalytic performance of the nanocrystalline NiWO 4 electrocatalyst was evaluated for enzymeless glucose measurement and water-splitting application. This electrocatalyst exhibited excellent sensitivity of 9731 μA mM −1  cm −2 within the linear range of 25–325 μM. Further, the glucose concentrations present in human blood samples were measured using the proposed nanocrystalline NiWO 4 electrocatalyst. Also, hydrogen evolution reaction, the electrocatalyst exhibited 171 mV of overpotential at 10 mA cm −2 with a Tafel slope of 70 mV dec −1 . Further, chronopotentiometry study was carried out at 100 mA cm −2 and it showed 94% retention after 24 h. These findings greatly promote the outstanding electrocatalytic performance of nanocrystalline and porous NiWO 4 electrocatalysts that outline their applicability for electrochemical catalysis purposes.