In situ deposited cobalt-magnesium selenates as an advanced electrode for electrochemical energy storage

材料科学 双金属片 电极 超级电容器 电化学 氧化钴 化学工程 储能 热液循环 氧化物 纳米技术 核化学 金属 冶金 化学 功率(物理) 物理化学 工程类 物理 量子力学
作者
Manchi Nagaraju,S. Chandra Sekhar,Bhimanaboina Ramulu,Shaik Junied Arbaz,Jae Su Yu
出处
期刊:Journal of Magnesium and Alloys [Elsevier BV]
卷期号:10 (12): 3565-3575 被引量:11
标识
DOI:10.1016/j.jma.2021.12.012
摘要

Currently, bimetallic selenates have attracted much attention as a prominent electrode composite material for supercapacitors owing to their higher redox chemistry and superior electrical conductivity. Herein, we synthesized cobalt-magnesium selenates (CoSeO3−MgSeO4, CMS) via a facile hydrothermal process, followed by selenization. At first, cobalt-magnesium oxide (Co2.32Mg0.68O4, CMO) was in situ prepared by a one-pot hydrothermal method. An investigation on the morphological change was performed by synthesizing the same CMO samples at different growth times by keeping the temperature constant. The CMO electrode designed for 8 h of growth time (CMO-8 h) with an attractive morphology showed a higher areal capacity of 101.7 µAh cm−2 (at 3 mA cm−2) than the other CMO electrodes prepared for 6 and 10 h. Further exalted performance was achieved by the selenization of the CMO-8 h sample to form the CMS material. At 3 mA cm−2, the resulted CMS exhibited nearly three times higher capacity, i.e., 385.4 µAh cm−2, than the CMO-8 h electrode. Additionally, an asymmetric cell fabricated with CMS as a positive electrode also revealed good energy storage performance. Within the applied voltage between 0 and 1.5 V, the asymmetric cell demonstrated maximum energy density of 0.159 mWh cm−2 (18.6 Wh kg−1) and maximum power density of 18.47 mW cm−2 (1938 W kg−1), respectively. Thus, novel magnesium-based metal selenates can act as an efficient electrode for energy storage.
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