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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0014

    • Keywords

       

      Deep eutectic solvents (DESs); silver; electrodeposition; electrochemical behaviour; microscopic morphology.

    • Abstract

       

      Electrochemical reduction behaviours of silver ions in ChCl–urea deep eutectic solvents (DESs) were investigated by cyclic voltammetry. The results showed that equilibrium potential $E_{\rm eq}$ of the electrode system in ChCl–urea DESs was $-$0.112 V. The Tafel curve was used to obtain the exchange current density $j^0 = 2.92 \pm 0.2$ cm$^{-2}$ and the transfer coefficient $\alpha = 0.16 \pm 0.2$. The nucleation and growth mechanism of silver were studied by cyclic current method. The results showed that electrodeposition consisted of two processes, 3D nucleation with diffusion-controlled growth $j_{\rm 3D-dc}(t)$ and a small amount of water in the reduction $j_{\rm WR}(t)$. By calculating the percentage of different charge densities of $j_{\rm 3D-dc}$ and $j_{\rm WR}$, the contribution rate of different processes to the total current was analysed. With the increase in potential, the charge in water reduction process decreased, while the charge in silver 3D nucleation process increased. Scanningelectron microscope and energy spectrum scanning were used to characterize the surface and section micro-morphologies of silver coating. The results showed that silver grew dendritically at $-$0.97 V, and the thickness was 22.98 $\mu$m. The results of X-ray photoelectron spectroscopy showed that silver coating was composed of Ag$_2$O and Ag.

    • Author Affiliations

       

      QISONG LI1 HUIXUAN QIAN1 XU FU1 HAIJING SUN1 JIE SUN1

      1. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, People’s Republic of China

    • Dates

       
      Published
      3 February 2021
      Manuscript received
      14 April 2020
      Accepted
      25 June 2020
      Final version published online
      3 February 2021

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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