Highly Porous Willow Wood-Derived Activated Carbon for High-Performance Supercapacitor Electrodes

作者：Josphat Phiri, Jinze Dou, Tapani Vuorinen, Patrick A. C. Gane, Thaddeus Maloney · 发表于：ACS Omega · 年份：2019 · DOI：10.1021/acsomega.9b01977 · 被引用次数：185 · 研究领域：Supercapacitor Materials and Fabrication、Advancements in Battery Materials、Electrospun Nanofibers in Biomedical Applications

Abstract In this study, we present willow wood as a new low-cost, renewable, and sustainable biomass source for the production of a highly porous activated carbon for application in energy storage devices. The obtained activated carbon showed favorable features required for excellent electrochemical performance such as high surface area (∼2 800 m2 g–1) and pore volume (1.45 cm3 g–1), with coexistence of micropores and mesopores. This carbon material was tested as an electrode for supercapacitor application and showed a high specific capacitance of 394 F g–1 at a current density of 1 A g–1 and good cycling stability, retaining ∼94% capacitance after 5 000 cycles (at a current density of 5 A g–1) in 6 M KOH electrolyte. The prepared carbon material also showed an excellent rate performance in a symmetrical two-electrode full cell configuration using 1 M Na2SO4 electrolyte, in a high working voltage of 1.8 V. The maximum energy density and power density of the fabricated symmetric cell reach 23 W h kg–1 and 10 000 W kg–1, respectively. These results demonstrate that willow wood can serve as a low-cost carbon feedstock for production of high-performance electrode material for supercapacitors.