Kuo Tsung-Rong, Cheng Yi-Chun, Chieh Dong-Ching, Kongvarhodom Chutima, Yougbaré Sibidou, Saukani Muhammad, Chen Hung-Ming, Lin Lu-Yin
Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan; International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan.
Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 2):138463. doi: 10.1016/j.jcis.2025.138463. Epub 2025 Jul 16.
Nickel-based compounds are widely studied for battery supercapacitor hybrids (BSHs) due to their redox activity and high theoretical capacitance, but their limited conductivity and structural instability remain challenges. Incorporating copper into nickel-based systems is a practical strategy to enhance electronic conductivity and influence phase formation. The use of fluorine-containing structure-directing agents (SDAs) such as NHBF and NHHF can regulate crystal growth, interlayer distance, and surface properties through the formation of fluorine complexes. In addition, 2-methylimidazole is introduced to coordinate with metal ions during the initial solution process, which helps stabilize precursor complexes and support uniform nucleation. These chemical agents collectively guide the formation of a porous nanostructure with tailored phase composition. In this work, nickel copper compounds are synthesized by a solution process using NHBF, NHHF and 2-methylimidazole, followed by oxidation at varied temperatures. The optimal Cu-Ni compound synthesized at 300 °C (CuNi300) exhibits a multiphase composition of hydroxides and oxides with favorable morphology, delivering a specific capacitance (C) of 1026.0 F/g at 10 mV/s. A BSH assembled with CuNi300 and carbon electrodes achieves a maximum energy density of 82.95 Wh/kg at 350 W/kg, and a C retention of 93.2% and Coulombic efficiency of 89.4% after 10,000 cycles.
由于其氧化还原活性和高理论电容，镍基化合物在电池超级电容器混合体（BSHs）方面得到了广泛研究，但它们有限的导电性和结构不稳定性仍然是挑战。将铜引入镍基体系是提高电子导电性和影响相形成的一种实用策略。使用含氟结构导向剂（SDA）如NHBF和NHHF可以通过形成氟配合物来调节晶体生长、层间距离和表面性质。此外，引入2-甲基咪唑在初始溶液过程中与金属离子配位，这有助于稳定前驱体配合物并支持均匀成核。这些化学试剂共同引导形成具有定制相组成的多孔纳米结构。在这项工作中，通过使用NHBF、NHHF和2-甲基咪唑的溶液法合成镍铜化合物，随后在不同温度下进行氧化。在300°C合成的最佳Cu-Ni化合物（CuNi300）表现出氢氧化物和氧化物的多相组成，具有良好的形态，在10mV/s下的比电容（C）为1026.0F/g。由CuNi300和碳电极组装的BSH在350W/kg时实现了82.95Wh/kg的最大能量密度，在10000次循环后C保持率为93.2%，库仑效率为89.4%。
