材料科学
镍
钼酸盐
电极
化学工程
电化学
氧化还原
过渡金属
铜
纳米颗粒
无机化学
催化作用
纳米技术
冶金
化学
有机化学
工程类
物理化学
作者
Bhimanaboina Ramulu,S. Chandra Sekhar,Shaik Junied Arbaz,Manchi Nagaraju,Jae Su Yu
标识
DOI:10.1016/j.ensm.2021.10.027
摘要
Transition metal molybdates and phosphates are prominent electroactive materials for energy storage devices due to their high theoretical capacity, multiple valence states, good electrical conductivity, and natural abundance. Herein, we report in-situ grown high redox-active copper-nickel molybdate (CuNiMo) on copper foam (CF) via a one-pot solvothermal approach and the influence of reaction time on its morphology was studied in detail. The CuNiMo electrode prepared at a reaction time of 9 h (CuNiMo-9/CF) exhibited ultrathin nanosheets (UTNSs) that are vertically grown from CF substrate with the interconnected network. Owing to the advanced morphological features, the CuNiMo-9/CF electrode delivered a superior areal capacity of 387.5 µAh cm−2 (at 5 mA cm−2) to the other CuNiMo electrodes obtained at the reaction times of 6 and 12 h. In addition, the bare CF, CuNi-9/CF, and CuMo-9/CF electrodes were investigated for comparison. Next, Co-Ni phosphate (CoNiP) nanoparticle-layer was decorated on CuNiMo-9/CF UTNSs by a solution-immersion technique to enhance the redox chemistry. Exploiting the synergistic features of mixed metal molybdates and phosphates, the [email protected]/CF composite material exhibited an exalted areal capacity of 666 µAh cm−2 at the same current density. Furthermore, the hybrid cell (HC) was assembled with the [email protected]/CF as the positive electrode to explore its practical applicability. The assembled HC also exhibited maximum energy and power densities of 38.2 Wh kg−1 (1.09 mWh cm−2) and 2327.5 W kg−1 (66.5 mW cm−2), respectively. Also, the HC device demonstrated good cycling stability with a notable capacity retention of 87.7% after 3000 cycles. The real-time viability of HC was also tested by powering various electronic components.
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