Yuqing Kuai, Meitang Liu,* Hongwen Ma, Tianlei Wang
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China
The imminent of fossil forces and the environment problem triggered by it have intensified studies for renewable, cleaner and cost-effective energy storage/conversion devices. [1-2] Supercapacitors, as a bridge between traditional capacitors and batteries, possess higher power density and longer cycle life than batteries. [3-4] Till date, researches based on transition metal oxides and sulphides as faradaic electrode materials have been fruitfully inspected in quantity. [5-6] However, in order to obtain enhanced capacitive performance electrode materials, the same main group selenides are explored recently due to its lower electronegativity.  In this work, we synthesized a 3D flower-like nanosheet nickel selenide electrode by one step selenization of flower-like nickel precursors. Comparing with flower-like nickel precursors, the nickel selenide exhibits better specific capacity and rate capability. The specific capacity almost enhanced 5 times of nickel precursors. Besides, the 3D flower-like nanosheet nickel selenide electrode also demonstrates good cycling stability. Above all results, it is believed that the proposed 3D flower-like nanosheet nickel selenide electrode could be a new potential faradaic electrode in the development of hybrid supercapacitor.
 X.F. Wang, B. Liu, Q.F. Wang, W.F. Song, X.J. Hou, D. Chen, Y.B. Cheng, G.Z. Shen. Advanced Materials. 2013, 25, 1479-1486.
 A. Banerjee, S. Bhatnagar, K.K. Upadhyay, P. Yadav, S. Ogale. ACS Applied Materials & Interfaces. 2014, 6, 18844-18852.
 C.L. Zhang, H.H. Yin, M. Han, Z.H. Dai, H. Pang, Y.L. Zheng, Y.Q. Lan, J.C. Bao, J.M. Zhu. ACS NANO. 2014, 8, 3761-3770.
 H. Peng, C.D. Wei, K. Wang, T.Y. Meng, G.F Ma, Z.Q. Lei, X. Gong. ACS Applied Materials & Interfaces. 2017, 9, 17067-17075.
 T.L. Wang, M.T. Liu, H.W. Ma, Nanomaterials. 2017, 7, 140-150.
 Y. Fu, M.T. Liu, H.W. Ma, T.L. Wang, K.R. Hu, C. Guan, Electrochimica Acta. 2016, 191,916-922.
 P. Xua, W. Zeng, S.H. Luo, C.X Ling, J.W. Xiao, A.J. Zhou, Y.M. Sun, K. Liao. Electrochimica Acta. 2017, 241, 41-49.