An OH--slow-release strategy was established to controllably tune the（ α-and β-） phase of nickel cobalt binary hydroxide in the presence of ammonium chloride. Ammonium chloride is added to the ionic solution to regulate the p H of the solution and slow down the release of OH-, effectively regulating the phase, nanostructure, interlayer spacing, surface area, thickness, and the performance of binary Ni –Co hydroxide. The ion-slow-release mechanism is conducive to the formation of α-phase with larger interlayer spacing and thinner flakes rather than β-phase. Attributed to the enlarged interlayer spacing, thinner nanosheets, and more exposed active sites, the resultant α-phase hydroxides（NCNS-5.2）, displayed much lower over potential of 285 mV with respect to the dense-stacked β-phase hydroxides（362 mV） for OER at 10 mA/cm2. It also exhibited high specific capacitance of 1474.2 F/g, when tested at 0.5 A/g within a voltage range of 0–0.45 Vvs. Hg/Hg O. This composite was also stable for water oxidation reaction and supercapacitor. The proof-of-concept of using controlled-release agent may provide suggestive insights for the material innovation and a variety of applications.
类型: 期刊论文
作者: Min Wei,Jing Li,Wei Chu,Ning Wang
来源: Journal of Energy Chemistry 2019年11期
年度: 2019
分类: 工程科技Ⅰ辑,工程科技Ⅱ辑
专业: 材料科学,电力工业
单位: School of Chemical Engineering, Sichuan University,Collaboration Innovation Center of Chemistry for Energy Materials, Xiamen University,Department of Chemical Engineering, Tsinghua University,Physical Sciences and Engineering Division, King Abdullah University of Science and Technology
基金: supported by the National Natural Science Foundation of China(21476145)
分类号: TM53;TB383.1
页码: 26-33
总页数: 8
文件大小: 1084K
下载量: 5
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