Kim Sung-Kon, Kim Yun Ki, Lee Hyunjoo, Lee Sang Bok, Park Ho Seok
Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701 (Republic of Korea).
ChemSusChem. 2014 Apr;7(4):1094-101. doi: 10.1002/cssc.201301061. Epub 2014 Feb 23.
Strong demand for high-performance energy-storage devices has currently motivated the development of emerging capacitive materials that can resolve their critical challenge (i.e., low energy density) and that are renewable and inexpensive energy-storage materials from both environmental and economic viewpoints. Herein, the pseudocapacitive behavior of lignin nanocrystals confined on reduced graphene oxides (RGOs) used for renewable energy-storage materials is demonstrated. The excellent capacitive characteristics of the renewable hybrid electrodes were achieved by synergizing the fast and reversible redox charge transfer of surface-confined quinone and the interplay with electron-conducting RGOs. Accordingly, pseudocapacitors with remarkable rate and cyclic performances (~96 % retention after 3000 cycles) showed a maximum capacitance of 432 F g(-1), which was close to the theoretical capacitance of 482 F g(-1) and sixfold higher than that of RGO (93 F g(-1)). The chemical strategy delineated herein paves the way to develop advanced renewable electrodes for energy-storage applications and understand the redox chemistry of electroactive biomaterials.
目前，对高性能储能设备的强烈需求推动了新型电容材料的开发，这些材料能够解决其关键挑战（即低能量密度），并且从环境和经济角度来看都是可再生且廉价的储能材料。在此，展示了用于可再生储能材料的负载于还原氧化石墨烯（RGO）上的木质素纳米晶体的赝电容行为。通过协同表面受限醌的快速可逆氧化还原电荷转移以及与导电RGO的相互作用，实现了可再生混合电极优异的电容特性。因此，具有显著倍率和循环性能（3000次循环后保留率约96%）的赝电容器显示出最大电容为432 F g(-1)，接近理论电容482 F g(-1)，比RGO（93 F g(-1)）高六倍。本文所描述的化学策略为开发用于储能应用的先进可再生电极以及理解电活性生物材料的氧化还原化学铺平了道路。
