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首页> 外文期刊>Journal of Energy Storage >Synthesis of worm-like binary metallic active material by electroless deposition approach for high-performance supercapacitor
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Synthesis of worm-like binary metallic active material by electroless deposition approach for high-performance supercapacitor

机译：高性能超级电容器无电沉积方法合成蠕虫状二元金属活性材料

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Finding a convenient low-cost method to prepare a promising charge storage material for high-performance supercapacitors remains always a critical challenge. Herein, the facilely eco-friendly electroless electrolytic (EE) technique was employed to deposit a worm-like Ni-Co-P nanofilm directly on nickel foam (NF) substrate. Gross morphology and microstructure of the as-prepared active material were confirmed by SEM, EDS and XRD techniques. The supercapacitive properties of Ni-Co-P/NF electrode was studied in 6.0 M KOH solution by cyclic voltammetry (CV), galvanostatic charging/discharging (GCD) and electrochemical impedance spectroscopy (EIS). CV curves displayed a pair of two broad current peaks (I-p) associated with the reversible redox reactions within the fabricated Ni-Co-P. The high slope value of the linear relationship I-p vs. upsilon(1/2) reveals readily accessible diffuse pathways due to a porous texture of Ni-Co-P active material. Its specific capacitance increased with the decrease in the scan speed achieving 222.16 F/g at a 1.0 mV/s. The observed definite plateaus in the charging/discharging profile confirms the battery-like behavior of Ni-Co-P prepared material. Its pseudocapacitive charge storage mechanism was analyzed based on the power law (I(v) = a upsilon(b)). Ni-Co-P showed an excellent rate performance, where its coulombic efficiency (eta%) increases with the applied current density reaching 174.5% at 10 A/g. Besides, Ni-Co-P exhibited an outstanding long-term cyclability with enhanced capacitance retention stabilized at around 105% over 1000 cycles at 50 mV/s. This was further evinced from the observed significant decrease in the electrode total resistance after cycling. The study points to the viability of EE method for the successful low-cost synthesis of efficient charge storage materials with excellent stability for high-performance supercapacitor applications.
机译：寻找方便的低成本方法，为高性能超级电容器制备有前途的电荷储存材料仍然是一个关键挑战。这里，采用易于生态友好的无电解电解（EE）技术，将蠕虫状Ni-Co-P纳米丝酸沉积在镍泡沫（NF）底物上。通过SEM，EDS和XRD技术确认了制备的活性物质的总体形态和微观结构。通过循环伏安法（CV），电压静电充电/放电（GCD）和电化学阻抗光谱（EIS）在6.0M KOH溶液中研究了Ni-Co-P / NF电极的超电容性质。 CV曲线显示了与制造的Ni-Co-p内的可逆氧化还原反应相关的一对两个宽电流峰（I-P）。线性关系I-P与Upsilon（1/2）的高斜率值揭示了由于Ni-Co-P活性材料的多孔纹理而易于接近的漫射途径。其特定电容随着扫描速度的降低而在1.0mV / s下实现222.16 f / g。充电/放电轮廓中观察到的明确平台确认了Ni-Co-P制备材料的电池状行为。基于电力法（I（v）= upsilon（b））分析其假电容电荷储存机制。 Ni-Co-P显示出优异的速率性能，其中其库仑效率（ETA％）随着施加的电流密度达到10 A / g的施加电流密度增加。此外，Ni-Co-P表现出优异的长期可自由性，具有增强的电容保留稳定在50mV / s的505％以上超过1000次循环。从循环后的电极总抗性的观察到的显着降低，这进一步表达了这一点。该研究指出了EE方法的可行性，以实现高效电荷储存材料的成功合成，具有优异的高性能超级电容器应用的稳定性。

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