2.6 V aqueous symmetric supercapacitors based on phosphorus-doped TiO nanotube arrays

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 49; no. 6; pp. 1785 - 1793
• Main Authors: Zhang, Yaxiong, Duan, Shifang, Li, Yan, Zhang, Shengming, Wu, Yin, Ma, Mingyu, Tao, Chunlan, Zhang, Zhenxing, Qin, Dongdong, Xie, Erqing
• Format: Journal Article
• Published: 11.02.2020
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c9dt04316k

Increasing the voltage window of an electrode material is effective for improving the energy density of aqueous symmetric supercapacitors. Herein, a novel aqueous symmetric supercapacitor equipped with a high cell voltage window of 2.6 V was assembled by P-doped TiO 2 nanotube arrays on a Ti sheet. The arrays exhibit a wide potential range of about 1.2 V as the cathode, and a stable wide potential range of 1.4 V as the anode was also obtained. These wide potential windows in the cathode and anode render the symmetric supercapacitor with a very large working voltage window reaching 2.6 V, and thus a high volumetric energy density (1.65 mW h cm −3 ). These results suggest that P-doped TiO 2 nanotube arrays can be promising candidates for energy storage devices. P-Doped TiO 2 nanotube arrays exhibit excellent electrochemical performance in an aqueous symmetric supercapacitor with a widened potential window of 2.6 V.