Jiang Lili, Luo Dan, Zhang Qinyong, Ma Sude, Wan Guojiang, Lu Xiong, Ren Zhifeng
Key Laboratory of Fluid and Power Machinery of Ministry of Education, Center for Advanced Materials and Energy, School of Materials Science and Engineering, Xihua University, Chengdu, 610039, P. R. China.
Department of Physics and TcSUH, University of Houston, Houston, Texas, 77204, United States.
Chemistry. 2019 Jun 12;25(33):7903-7911. doi: 10.1002/chem.201900399. Epub 2019 May 15.
The advantage of using composite electrode materials for energy storage is, to a large extent, the synergistic role of their components. Our work focuses on the investigation of the interactions of each phase, exploring the patterns found with the change of materials to provide theoretical or experimental foundations for future study. Here, conductive polymers (CPs), including polyaniline (PANi), polypyrrole (PPy), and polythiophene (PTh), as well as reduced graphene oxide (rGO), and TiO with the different crystalline phases of anatase and rutile were applied to form a series of free-standing and flexible binary or ternary composite electrodes. The electrochemical behaviors of these composite electrodes are presented. The results indicate that the synergistic improvement in electrochemical performance is due to the incorporation of the different components. CPs significantly increase the current density of these composite films and contribute their pseudocapacitance to improve the specific capacitance, but lead to a decline in cycle stability. After introducing TiO , both the specific capacitance and the cycle-stability of rGO-TiO -CP were synergistically improved. A CP can magnify the pseudocapacitance behavior of any of the TiO crystalline phases, and interactions vary with the specific CP and the specific TiO crystalline phase employed. The synergistic effects of the as-prepared composites were theoretically predicted and explored.
使用复合电极材料进行能量存储的优势在很大程度上源于其各组分之间的协同作用。我们的工作重点在于研究各相之间的相互作用，探索材料变化时所发现的规律，为未来的研究提供理论或实验基础。在此，导电聚合物（CPs），包括聚苯胺（PANi）、聚吡咯（PPy）和聚噻吩（PTh），以及还原氧化石墨烯（rGO）和具有锐钛矿和金红石不同晶相的TiO，被用于形成一系列独立且柔性的二元或三元复合电极。展示了这些复合电极的电化学行为。结果表明，电化学性能的协同提升归因于不同组分的引入。CPs显著提高了这些复合膜的电流密度，并贡献其赝电容以提高比电容，但导致循环稳定性下降。引入TiO后，rGO-TiO-CP的比电容和循环稳定性均得到协同改善。CP可以放大任何TiO晶相的赝电容行为，且相互作用会因所使用的特定CP和特定TiO晶相而有所不同。对所制备复合材料的协同效应进行了理论预测和探索。
