材料科学
电容
替代(逻辑)
理论(学习稳定性)
亲核取代
电极
计算机科学
物理化学
机器学习
有机化学
化学
程序设计语言
作者
Jiang Xu,Ryan S. Longchamps,Xi Wang,Bingqing Hu,Xude Li,Shijian Wang,Lvzhou Li,Yaokai Gu,Xiaoting Cao,Huafei Guo,Shanhai Ge,Guoxiu Wang,Jian Ning Ding
标识
DOI:10.1002/adfm.202408892
摘要
Abstract Combining the merits of battery and supercapacitor into a single device represents a major scientific and technological challenge. From a design perspective, electrode material plays a key role in the device and the fundamental difficulty lies in incorporating a high density of active sites into a stable material with excellent charge transfer kinetics. Here, the synthesis is reported of a nearly full‐oxygen‐functionalized 2D conductive transition metal carbide (Ti 3 C 2 O y ) with ultrahigh density of Ti─O/═O redox‐active sites by nucleophilic substitution and in situ oxidation under the presence of a proper electrophilic reagent (K + ). The fabricated electrode delivered exceptionally high gravimetric and volumetric capacitance (1,082 F g −1 and 3,182 F cm −3 in a potential window of 0.85 V, approximating the theoretical capacity of many transition metal oxides), fast charging/discharging in tens of seconds across a wide range of temperature (−70 to 60 °C), and excellent structural and chemical stability. These promising results provide avenues for the development of high‐energy, high‐power storage devices as well as electromagnetic shielding, and electronic and optoelectronic devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI