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Formation of Ni x Co 3− x S 4 Hollow Nanoprisms with Enhanced Pseudocapacitive Properties
Author(s) -
Yu Le,
Zhang Lei,
Wu Hao Bin,
Lou Xiong Wen David
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201400226
Subject(s) - materials science , tetragonal crystal system , sulfidation , cobalt , cobalt hydroxide , supercapacitor , nickel , nanostructure , template , electrochemistry , chemical engineering , nanotechnology , hydroxide , nanorod , cobalt sulfide , hydrothermal circulation , electrode , crystallography , crystal structure , chemistry , metallurgy , sulfur , engineering
Hollow nanostructures are of great interest for a wide variety of applications. Despite the great advances, synthesis of anisotropic hollow structures is still very challenging. In this work, we have developed a simple sacrificial template method to synthesize uniform Ni x Co 3− x S 4 hollow nanoprisms with tunable composition. Tetragonal nanoprisms of nickel–cobalt acetate hydroxide precursors with controllable Ni/Co molar ratios are first synthesized and used as the sacrificial templates. After a sulfidation process with thioacetamide (TAA) in ethanol, the solid precursor prisms can be transformed into the corresponding Ni x Co 3− x S 4 hollow nanoprisms with a well‐defined hollow interior. The intriguing structural and compositional features are beneficial for electrochemical applications. Impressively, the resultant Ni x Co 3− x S 4 hollow prisms manifest a high specific capacitance with enhanced cycling stability, making them potential electrode materials for supercapacitors.