Yao Bin, Peng Huarong, Zhang Haozhe, Kang Junzhe, Zhu Cheng, Delgado Gerardo, Byrne Dana, Faulkner Soren, Freyman Megan, Lu Xihong, Worsley Marcus A, Lu Jennifer Q, Li Yat
Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States.
MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Nano Lett. 2021 May 12;21(9):3731-3737. doi: 10.1021/acs.nanolett.0c04780. Epub 2021 Mar 10.
Maintaining fast charging capability at low temperatures represents a significant challenge for supercapacitors. The performance of conventional porous carbon electrodes often deteriorates quickly with the decrease of temperature due to sluggish ion and charge transport. Here we fabricate a 3D-printed multiscale porous carbon aerogel (3D-MCA) via a unique combination of chemical methods and the direct ink writing technique. 3D-MCA has an open porous structure with a large surface area of ∼1750 m g. At -70 °C, the symmetric device achieves outstanding capacitance of 148.6 F g at 5 mV s. Significantly, it retains a capacitance of 71.4 F g at a high scan rate of 200 mV s, which is 6.5 times higher than the non-3D printed MCA. These values rank among the best results reported for low temperature supercapacitors. These impressive results highlight the essential role of open porous structures for preserving capacitive performance at ultralow temperatures.
对于超级电容器而言，在低温下保持快速充电能力是一项重大挑战。由于离子和电荷传输缓慢，传统多孔碳电极的性能常常会随着温度降低而迅速恶化。在此，我们通过化学方法与直接墨水书写技术的独特结合，制造出一种3D打印的多尺度多孔碳气凝胶（3D-MCA）。3D-MCA具有开放的多孔结构，比表面积约为1750 m²/g。在-70°C时，对称器件在5 mV/s下实现了148.6 F/g的出色电容。值得注意的是，在200 mV/s的高扫描速率下，它仍保持71.4 F/g的电容，这比未进行3D打印的MCA高出6.5倍。这些数值跻身于低温超级电容器所报道的最佳结果之列。这些令人印象深刻的结果凸显了开放多孔结构在超低温下保持电容性能的关键作用。
