Porosity‐engineered Hard Carbons Hybridized with Carbon Nanotubes for Electrochemical Capacitors

[摘要] Mesoporous carbon‐based materials are attractive for energy storage devices. A novel multidimensional carbonaceous electrode material (hard carbon‐CNT, denoted as HC‐CNT) with the utilization of porous hard carbon as support was successfully synthesized in this work. Morphology of as‐obtained products was characterized by scanning electron microscopy (SEM), the phase was investigated by X‐ray diffraction (XRD), and the surface area was tested via Brunauer Emmett Teller (BET) method. The specific area of as‐synthesized HC‐CNT was up to 72.1 m2/g compared to hard carbon material (2.4 m2/g). The electrochemical characterization of HC‐CNT electrode was performed in a three‐electrode system. The results indicated great improvement in electrochemical performances for supercapacitors. The mass‐specific capacitance of HC‐CNT was 96.6 mF/cm2 at the current density of 1.5 mA/cm2, which was approximately two to three times larger than that of HCs. Furthermore, HC‐CNT electrode showed a lower internal resistance and superior charge–discharge property, demonstrating the kind of materials can be a promising candidate for electrode material for energy storage devices.

[学科分类] 化学（综合）

[关键词] Hard carbon;Carbon nanotubes;Supercapacitors