Effect of solvent for tailoring the nanomorphology of multinary CuCo2S4 for overall water splitting and energy storage
Effect of solvent for tailoring the nanomorphology of multinary CuCo2S4 for overall water splitting and energy storage
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DOI：
10.1016/j.jallcom.2019.01.012
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
C. Zequine;S. Bhoyate;Fangzhou Wang;Xianglin Li;K. Siam;P. Kahol;R. Gupta
中科院分区：
文献类型：
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作者：
C. Zequine;S. Bhoyate;Fangzhou Wang;Xianglin Li;K. Siam;P. Kahol;R. Gupta
调整电化学活性材料的纳米形态可以显著影响其最终的催化和电荷存储性能。在本研究中，通过改变水和乙醇的体积浓度来调节CuCo2O4和CuCo2S4的纳米结构形态，使得不同的纳米形状保持了相似的晶体结构。对合成的样品分别作为析氢催化剂(HER)和析氧催化剂(OER)进行了电催化性能分析。乙醇合成的CuCo2S4样品的HER和OER研究分别需要158mV的低过电位达到10 mA/cm2和290 mV才能达到20 mA/cm2。此外，使用对称电极的电解槽需要1.66 V的低电池总电位才能达到10 mA/cm2的电流密度，并保持稳定的性能超过24 h，显示出良好的双功能催化行为。此外，合成的样品还被用作高性能储能系统的电极。当电流密度为2 mA/cm2时，CuCo2S4电极的面电容为6.3cm2(3190.8 F/g)。能量与功率密度的拉根图分别为2 6 5 Wh/cm 2(132 Wh/kg)和11 9 W/cm2(5 973 MW/kg)。因此，从整体研究来看，可以肯定的是，CuCo2S4等纳米结构材料的形貌定制可能是一种很有前途的方法，可以促进能源产生和存储设备的发展。
Tailoring the nanomorphology of electrochemically active materials could significantly affect their resultant catalytic and charge storage performance. In this study, the nanostructured morphology of multinary CuCo2O4and CuCo2S4was tuned using a different volume concentration of water and ethanol resulting in different nano-shapes maintaining similar crystal structure. The electrocatalytic performance was analyzed for all the synthesized samples as the hydrogen (HER) and oxygen evolution catalyst (OER). The HER and OER study for CuCo2S4sample synthesized using ethanol required a low overpotential of 158 mV to reach 10 mA/cm2and 290 mV to achieve 20 mA/cm2, respectively. Furthermore, the electrolyzer cell using symmetrical electrodes required a low overall cell potential of 1.66 V to achieve a current density of 10 mA/cm2and maintained stable performance for over 24 h, suggesting a promising bifunctional catalytic behavior. Furthermore, the synthesized samples were studied as electrodes for high-performance energy storage systems. The CuCo2S4electrode showed an areal capacitance of 6.3 F/cm2(3190.8 F/g) at a current density of 2 mA/cm2. The Ragone plot for the areal energy versus power density resulted to be 265 mWh/cm2(132 Wh/kg) and 11.9 W/cm2(5973 W/kg), respectively. Thus, from the overall study, it can be confirmed that tailoring morphology of nanostructured material such as CuCo2S4could be a promising way for the advancement of energy generation and storage devices.