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Hierarchical Ni(OH)2–MnO2 hollow spheres as an electrode material for high-performance supercapacitors
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-06-01 , DOI: 10.1039/d2qi00780k
Chengzhen Wei 1, 2 , Jun Sun 1 , Yuchen Zhang 1 , Yue Liu 1 , Zhencai Guo 1 , Weimin Du 1 , Lin Liu 1 , Yongming Zhang 1, 3
Affiliation  

Hybrid electrode materials with hollow structures are incredibly attractive for energy storage owing to the synergies between the different materials used in their fabrication and the structural advantages they offer. Here we demonstrate a self-templating strategy to prepare hierarchical Ni(OH)2–MnO2 hollow spheres. First, Ni–Mn glycerate solid spheres are fabricated as the template and then chemically transformed into hierarchical Ni–Mn hydroxide hollow structures. Finally, hierarchical Ni(OH)2–MnO2 hollow spheres are obtained via oxidation of the Ni–Mn hydroxide with O2. These unique structures endow the Ni(OH)2–MnO2 material with many inner cavities, a high surface area and more electroactive sites. As an electrode material for supercapacitors, a large capacitance of 2086.6 F g−1 is obtained at 2.0 A g−1, and this can reach as high as 972.8 F g−1, even at 20 A g−1. Moreover, the hierarchical Ni(OH)2–MnO2 hollow spheres also have a remarkable rate capability and good cycling durability (only 11.5% capacitance reduction over 5000 cycles at 15 A g−1). A solid-state asymmetric supercapacitor device is constructed from the hierarchical Ni(OH)2–MnO2 hollow spheres and activated carbon. The device shows a high energy density of 68.7 W h kg−1 versus a power density of 1650 W kg−1 at 2.0 A g−1. The energy density remains at 25.8 W h kg−1 versus a power density of 12 372 W kg−1 at 15 A g−1. We envision that this work will not only offer a promising electrode material for supercapacitors but will also provide an alternative avenue to prepare hollow structured materials.

中文翻译:

分级 Ni(OH)2-MnO2 空心球作为高性能超级电容器的电极材料

由于制造中使用的不同材料之间的协同作用以及它们提供的结构优势,具有中空结构的混合电极材料对于能量存储具有极大的吸引力。在这里,我们展示了一种自模板化策略来制备分级 Ni(OH) 2 -MnO 2空心球。首先,以 Ni-Mn 甘油酸盐实心球为模板,然后化学转化为分级的 Ni-Mn 氢氧化物空心结构。最后,通过用O 2氧化Ni-Mn氢氧化物获得分级Ni(OH) 2 -MnO 2空心球。这些独特的结构赋予了 Ni(OH) 2 –MnO 2具有许多内腔、高表面积和更多电活性位点的材料。作为超级电容器的电极材料,在2.0 A g -1下可获得2086.6 F g -1的大电容,即使在20 A g -1下也可高达972.8 F g -1。此外,分级Ni(OH) 2 -MnO 2空心球还具有显着的倍率性能和良好的循环耐久性(在15 A g -1下5000 次循环后电容仅降低11.5% )。一种固态非对称超级电容器器件由分级 Ni(OH) 2 –MnO 2构成空心球和活性炭。该器件显示出 68.7 Wh kg -1 的高能量密度, 2.0 A g -1 时功率密度为 1650 W kg -1。能量密度保持在 25.8 W h kg -1,而在 15 A g -1时的功率密度为 12 372 W kg -1。我们设想这项工作不仅将为超级电容器提供一种有前途的电极材料,而且还将为制备中空结构材料提供另一种途径。
更新日期:2022-06-01
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