Nanosheet-Based\nHierarchical Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub> Microspheres\nwith Weak Crystallinity for High-Performance Supercapacitor
Guoxing Zhu (489541)Chunyan Xi (1739395)Mengqi Shen (1739392)Chunlin Bao (1739389)Jun Zhu (84054)
Abstract
Three-dimensionally\nhierarchical oxide/hydroxide materials have recently attracted increasing\ninterest by virtue of their exciting potential in electrochemical\nenergy conversion and storage. Herein, hierarchical Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub> microspheres assembled from ultrathin\nnanosheets were successfully synthesized by a one-pot/one-step hydrothermal\nroute. In this method, common nickel salts and urea were selected\nas raw materials. The influence of urea concentration on the final\nproduct was studied. The hierarchical Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub> microspheres show weak crystallinity and contain\ncrystalline water. It was found that they exhibit excellent rate capacity\nwhen used as supercapacitor electrode. Under current density of 0.5\nand 10 A/g, the optimized Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub> electrode with loading density of 5.3 mg/cm<sup>2</sup> exhibited\nspecific capacitances of 1178 and 613 F/g with excellent cycling stability.\nThe excellent electrochemical property is possibly attributed to the\nintrinsic nature of Ni<sub>2</sub>(CO<sub>3</sub>)(OH)<sub>2</sub>, the ultrathin thickness of nanosheet units, and the sufficient\nspace available to interact with the electrolyte. This facile synthesis\nstrategy and the good electrochemical properties indicate that hydroxycarbonates\nare promising materials for supercapacitor application. This study\nsuggests a large library of materials for potential application in\nenergy storage systems.
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