Modulated synthesis of nickel copper bimetallic compounds by ammonium fluoride-based complex as novel active materials of battery supercapacitor hybrids
Journal
Journal of Energy Storage
Journal Volume
104
Start Page
114567
ISSN
2352-152X
Date Issued
2024-12-20
Author(s)
Tsung-Rong Kuo
Muhammad Saukani
Dong-Ching Chieh
Yu-Cheng Cao
Pin-Yan Lee
Chutima Kongvarhodom
Sibidou Yougbaré
Hung-Ming Chen
Lu-Yin Lin
DOI
10.1016/j.est.2024.114567
Abstract
Bimetallic compounds have attracted much attention as efficient active materials of battery supercapacitor hybrid (BSH), owing to their multiple redox states, high electrical conductivity, and simply synthesis process. Nickel-based compounds offer high theoretical capacities, while copper-based compounds provide high electrical conductivity. The energy storage performance can be further enhanced designing favorable morphologies, which can be influenced by the incorporation of structure directing agents (SDAs) such as NH4BF4 and NH4HF2. In this study, nickel and copper bimetallic compounds are synthesized as active materials of BSHs in a novel environment containing metal salts, NH4BF4, NH4HF2, and 2-methylmidozole. The effects of the Cu to Ni ratio on material and electrochemical properties are investigated. To enhance the electrochemical contributions of nickel, which has higher theoretical capacities, the reaction time for copper ions is reduced. The optimal bimetallic (CuNi13) electrode achieves the highest specific capacitance (CF) of 1758.0 F/g, corresponding to a capacity of 791.1C/g at 1 A/g, due to the higher nickel content and smaller sheet sizes. The BSH assembled using the CuNi13 and reduced graphene oxide electrodes demonstrates a maximum energy density of 109.1 Wh/kg at 1071 kW/kg. The CF retention of 85.5% and Coulombic efficiency of 93.6% are also maintained after 10,000 cycles.
Subjects
Battery supercapacitor hybrid
Bimetallic
NH4BF4
NH4HF2
Nickel-based compound
Structure directing agent
Publisher
Elsevier BV
Type
journal article