Sakthinathan Subramanian, Rajakumaran Ramachandran, Keyan Arjunan Karthi, Yu Chung-Lun, Wu Chia-Fang, Vinothini Sivaramakrishnan, Chen Shen-Ming, Chiu Te-Wei
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology No. 1, Section 3, Chung-Hsiao East Road Taipei 106 Taiwan
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology No. 1, Section 3, Chung-Hsiao East Road Taipei 106 Taiwan.
RSC Adv. 2021 Apr 28;11(26):15856-15870. doi: 10.1039/d1ra02783b. eCollection 2021 Apr 26.
A simple hydrothermal process has been used to prepare a carbon nanofiber/copper chromium dioxide (CNF/CuCrO) composite for the selective detection of 4-nitrophenol (4-NP) and supercapacitor applications. The electrochemical sensor was developed with a glassy carbon electrode (GCE) modified with the CNF/CuCrO composite by the drop-casting method. The structural formation of the prepared materials was confirmed by infrared spectroscopy, electrochemical impedance spectroscopy, Raman spectroscopy, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. To investigate the electrochemical efficiency of the electrode, various electroanalytical techniques, namely, differential pulse voltammetry (DPV), cyclic voltammetry (CV) and galvanostatic charge-discharge tests, were employed. The GCE/CNF/CuCrO modified electrode exhibited excellent electrocatalytic behavior for the detection of 4-NP under optimized conditions with a low detection limit (0.022 μM), long linear response range of 0.1-150 μM, and high sensitivity (20.02 μA μM cm). The modified electrode was used for the detection of 4-NP in real samples with satisfactory results. In addition, the GCE/CNF/CuCrO electrode has advantages such as stability, reproducibility, repeatability, reliability, low cost, and practical application. The CNF/CuCrO composite coated Ni-foam electrodes also exhibited excellent supercapacitor efficiency, with a high specific capacitance of up to 159 F g at a current density of 5 A g and outstanding cycling stability. Hence, the CNF/CuCrO composite is a suitable material for 4-NP sensors and energy storage applications.
一种简单的水热法已被用于制备碳纳米纤维/二氧化铜铬（CNF/CuCrO）复合材料，用于选择性检测4-硝基苯酚（4-NP）以及超级电容器应用。通过滴铸法用CNF/CuCrO复合材料修饰玻碳电极（GCE）开发了电化学传感器。通过红外光谱、电化学阻抗谱、拉曼光谱、扫描电子显微镜、X射线衍射和透射电子显微镜确认了所制备材料的结构形成。为了研究电极的电化学效率，采用了各种电分析技术，即差分脉冲伏安法（DPV）、循环伏安法（CV）和恒电流充放电测试。在优化条件下，GCE/CNF/CuCrO修饰电极对4-NP的检测表现出优异的电催化行为，检测限低（0.022μM），线性响应范围长，为0.1-150μM，灵敏度高（20.02μAμM cm）。该修饰电极用于实际样品中4-NP的检测，结果令人满意。此外，GCE/CNF/CuCrO电极具有稳定性、可重复性、重复性、可靠性、低成本和实际应用等优点。涂覆有CNF/CuCrO复合材料的泡沫镍电极也表现出优异的超级电容器效率，在电流密度为5 A g时，比电容高达159 F g，循环稳定性出色。因此，CNF/CuCrO复合材料是用于4-NP传感器和能量存储应用的合适材料。
