Electrochemical metal nucleation and growth mechanism from metal nitrate-L-serine deep eutectic solvent

IF 5.6 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2025-04-21 DOI:10.1016/j.electacta.2025.146279

Shuling Liu , Yanling Hu , Xinyi Lu , Bowen Xin , Zeyi Wang , Yihao Li , Zhikai Hu , Chao Wang

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Abstract

Electrodeposited nickel, cobalt, and their alloys are critical for applications including energy storage, electrocatalysis and magnetic devices. Traditional aqueous electrodeposition suffers from hydrogen evolution, causing embrittlement, while deep eutectic solvents (DES) offer a promising alternative owing to their low water activity. Here, amino acid-metal nitrate DES (Ni(NO₃)₂ and/or Co(NO₃)₂-L‑serine) are introduced, and the electrochemical nucleation and growth mechanisms of Ni, Co, and their alloys are investigated. Cyclic voltammetry and potentiostatic transient analyses reveal potential-dependent nucleation and growth behavior. Electrodeposition of Ni from Ni(NO₃)₂/L‑serine DES exhibits a two-stage nucleation and growth behavior. The electrodeposition of Co from Co(NO₃)₂/L‑serine DES follows a three-dimensional progressive nucleation mechanism. New models integrating proton reduction and adsorption with Scharifker-Mostany model for monometallic deposition and with Scharifker model for alloy deposition are proposed to interpret potentiostatic current transient behavior. The deposits are characterized by X-ray diffraction and scanning electron microscopy and the crystalline metal phases are confirmed.

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金属硝酸盐- l -丝氨酸深共熔溶剂中金属的电化学成核和生长机理

电沉积镍、钴及其合金对于储能、电催化和磁性器件等应用至关重要。传统的水电沉积受到析氢的影响，导致脆性，而深共晶溶剂（DES）由于其低水活度而提供了一个有希望的替代方案。本文介绍了氨基酸-金属硝酸盐DES (Ni（NO3)2和/或Co(NO3)2- l -丝氨酸），并研究了Ni、Co及其合金的电化学成核和生长机制。循环伏安法和恒电位瞬态分析揭示了依赖电位的成核和生长行为。Ni(NO3)2/ l -丝氨酸DES电沉积Ni表现为两阶段成核和生长行为。Co(NO3)2/ l -丝氨酸DES电沉积Co遵循三维渐进成核机制。提出了一种将质子还原吸附与单金属沉积的Scharifker- mostany模型和合金沉积的Scharifker模型相结合的新模型来解释恒电位电流的瞬态行为。用x射线衍射和扫描电镜对矿床进行了表征，并确定了金属相。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.