Effects of additives on zinc electrodeposition from alkaline zincate solution

Kundale

et al. 2023

Small

In recent years, many metal oxides have been rigorously studied to be employed as solid electrolytes for resistive switching (RS) devices. Among these solid electrolytes, lanthanum oxide (La2O3) is comparatively less explored for RS applications. Given this, the present work focuses on the electrodeposition of La2O3 switching layers and the investigation of their RS properties for memory and neuromorphic computing applications. Initially, the electrodeposited La2O3 switching layers are thoroughly characterized by various analytical techniques. The electrochemical impedance spectroscopy (EIS) and Mott–Schottky techniques are probed to understand the in situ electrodeposition, RS mechanism, and n‐type semiconducting nature of the fabricated La2O3 switching layers. All the fabricated devices exhibit bipolar RS characteristics with excellent endurance and stable retention. Moreover, the device mimics the various bio‐synaptic properties such as potentiation‐depression, excitatory post‐synaptic currents, and paired‐pulse facilitation. It is demonstrated that the fabricated devices are non‐ideal memristors based on double‐valued charge‐flux characteristics. The switching variation of the device is studied using the Weibull distribution technique and modeled and predicted by the time series analysis technique. Based on electrical and EIS results, a possible filamentary‐based RS mechanism is suggested. The present results assert that La2O3 is a promising solid electrolyte for memory and brain‐inspired applications.

Section: Resultsmentioning

confidence: 99%

Self‐Assembled Lanthanum Oxide Nanoflakes by Electrodeposition Technique for Resistive Switching Memory and Artificial Synaptic Devices

Kundale

et al. 2023

Small

ACS Appl. Mater. Interfaces

“…We used the vanillin additive to improve the nucleation rate of the zinc. 36 The double membrane system consisted of Nafion 117 and Selemion DSV membranes as cation and anion exchange membranes, respectively. The charge and discharge curves of the hybrid Zn−V redox flow batteries with the CF, SCF, CCF, and SCCF electrodes at a current density of 20 mA cm −2 are shown in Figures 5a and S12.…”

Section: Resultsmentioning

confidence: 99%

“…We found that an anolyte containing 0.1 M ZnO and 0.005 M vanillin dissolved in 3 M NaOH, a catholyte containing 0.1 M VOSO 4 dissolved in 3 M H 2 SO 4 , and a middle electrolyte containing 3 M NaCl yield a stable cycling performance. We used the vanillin additive to improve the nucleation rate of the zinc . The double membrane system consisted of Nafion 117 and Selemion DSV membranes as cation and anion exchange membranes, respectively.…”

Section: Resultsmentioning

confidence: 99%

A High Voltage Aqueous Zinc–Vanadium Redox Flow Battery with Bimodal Tin and Copper Clusters by a Continuous-Flow Electrometallic Synthesis

Lee

Kim

Park

et al. 2023

Aqueous zinc-based redox flow batteries are promising large-scale energy storage applications due to their low cost, high safety, and environmental friendliness. However, the zinc dendritic growth has depressed the cycle performance, stability, and efficiency, hindering the commercialization of the zinc-based redox flow batteries. We fabricate the carbon felt modified with bimodal sized tin and copper clusters (SCCF) with the electrometallic synthesis in a continuous-flow cell. The SCCF electrode provides a larger zinc nucleation area and lower overpotential than pristine carbon felt, which is ascribed to the well-controlled interfacial interaction of bimodal tin and copper particle clusters by suppressing unwanted alloy formation. The zinc symmetric flow battery and the zinc-based hybrid redox flow battery show the improved zinc plating and stripping efficiency. The SCCF electrode exhibits 75% improved cycling stability compared to the pristine carbon felt electrode in the zinc symmetric flow battery. Notably, the high-voltage aqueous zinc–vanadium redox flow battery demonstrates a high average cell voltage of 2.31 V at 40 mA cm–2, showing a Coulombic efficiency of 99.9% and an energy efficiency of 87.6% for 100 cycles. We introduce a facile strategy to suppress the zinc dendritic growth, enhancing the performance of the zinc-based redox flow batteries.

“…29 In Ref. 30, the mixed addition of a quaternary ammonium salt and nicotinic acid sulfonate affected the deposition morphology, quaternary ammonium salt resulted in fine grain growth, and nicotinic acid sulfonate smoothened the electroplating surface. In the present work, potassium stannate shows similar effects of improved deposition morphology of zinc compared with the organic additives in Ref.…”

Section: Resultsmentioning

confidence: 99%

Effect of Stannum Ion on the Enhancement of the Charge Retention of Single-Flow Zinc–Nickel Battery

Yao

Chen

Cheng

et al. 2019

J. Electrochem. Soc.

This study aims to discuss the effect of stannum ion (potassium stannate) in alkaline zincate solution on the deposition/dissolution behavior of zinc anode for single-flow zinc-nickel battery (SFZNB). Physical analysis is conducted using scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS) technologies. The electrochemical performance of the battery is tested using cyclic voltammetry and galvanostatic techniques. Results show that adding potassium stannate in alkaline solution promotes crystal seed formation and grain growth and substantially improves the charge retention of the battery. The battery is charged to 18.75 mAh•cm −2 (based on the area of the electrode) at current density of 10 mA•cm −2 and set aside for 12 h. Then, the battery using electrolyte with 0.1 mol•L −1 potassium stannate has a discharge capacity of 15.20 mAh•cm −2 (coulomb efficiency of 81.1%). Moreover, the control sample has a discharge capacity of 11.25 mAh•cm −2 (coulomb efficiency of 60.0%). Thus, the present work provides a simple approach to restrain the SFZNB from self-discharge.