Avcıoğlu Suna, Buldu-Akturk Merve, Erdem Emre, Kaya Figen, Kaya Cengiz
Department of Metallurgical and Materials Engineering, Faculty of Chemistry and Metallurgy, Davutpaşa Campus, Yildiz Technical University, Istanbul 34210, Turkey.
Faculty of Engineering and Natural Sciences, Materials Science and Nano Engineering, Sabanci University, Istanbul 34956, Turkey.
Materials (Basel). 2023 Jan 16;16(2):861. doi: 10.3390/ma16020861.
In this study, boron carbide powders consisting mainly of nano/micro fibers or polyhedral-equiaxed particles were synthesized via the sol-gel technique, and the influence of particle morphology on electrochemical performance of boron carbide electrodes was investigated. Thermal decomposition duration of the precursors played a determinant role in the final morphology of the synthesized boron carbide powders. The morphology of boron carbide powders successfully tuned from polyhedral-equiaxed (with ~3 µm average particle size) to nano/micro fibers by adjusting the thermal decomposition duration of precursors. The length and thickness of fibers were in the range of 30 to 200 µm and sub-micron to 5 µm, respectively. The electrochemical performance analysis of boron carbide powders has shown that the particle morphology has a considerable impact on the boron carbide electrodes electrochemical performance. It was found that the synergetic effects of polyhedral-equiaxed and nano/micro fiber morphologies exhibited the best electrochemical performance in supercapacitor devices, resulting in the power and energy density of 34.9 W/kg and 0.016 Wh/kg, respectively.
在本研究中，通过溶胶 - 凝胶技术合成了主要由纳米/微纤维或多面体等轴颗粒组成的碳化硼粉末，并研究了颗粒形态对碳化硼电极电化学性能的影响。前驱体的热分解持续时间对合成的碳化硼粉末的最终形态起决定性作用。通过调整前驱体的热分解持续时间，成功地将碳化硼粉末的形态从多面体等轴（平均粒径约为3 µm）调整为纳米/微纤维。纤维的长度和厚度分别在30至200 µm和亚微米至5 µm范围内。碳化硼粉末电化学性能分析表明，颗粒形态对碳化硼电极的电化学性能有相当大的影响。结果发现，多面体等轴和纳米/微纤维形态的协同效应在超级电容器器件中表现出最佳的电化学性能，功率密度和能量密度分别为34.9 W/kg和0.016 Wh/kg。
