Cellular Structure Fabricated on Ni Wire by a Simple and Cost‐Effective Direct‐Flame Approach and Its Application in Fiber‐Shaped Supercapacitors. Issue 5 (13th February 2018)

• Record Type: Journal Article
• Authors: Wang, Zhihong; Cao, Fenhui; Chen, Kongfa; Yan, Yingming; Chen, Yifu; Zhang, Yaohui; Zhu, Xingbao; Wei, Bo; Xiong, Yueping; Lv, Zhe
• Is Part Of: ChemSusChem. Volume 11:Issue 5(2018)
• Page Start: 985
• Page End: 993
• Publication Date: 2018-02-13
• Subjects: cellular architecture -- energy transfer -- flame -- redox process -- transition metal; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201701886
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Cellular metals with the large surface/volume ratios and excellent electrical conductivity are widely applicable and have thus been studied extensively. It is highly desirable to develop a facile and cost‐effective process for fabrication of porous metallic structures, and yet more so for micro/nanoporous structures. A direct‐flame strategy is developed for in situ fabrication of micron‐scale cellular architecture on a Ni metal precursor. The flame provides the required heat and also serves as a fuel reformer, which provides a gas mixture of H2, CO, and O2 for redox treatment of metallic Ni. The redox processes at elevated temperatures allow fast reconstruction of the metal, leading to a cellular structure on Ni wire. This process is simple and clean and avoids the use of sacrificial materials or templates. Furthermore, nanocrystalline MnO2 is coated on the microporous Ni wire (MPNW) to form a supercapacitor electrode. The MnO2 /MPNW electrode and the corresponding fiber‐shaped supercapacitor exhibit high specific capacitance and excellent cycling stability. Moreover, this work provides a novel strategy for the fabrication of cellular metals and alloys for a variety of applications, including catalysis, energy storage and conversion, and chemical sensing. Abstract : Wires on fire : A direct‐flame strategy is developed for in situ fabrication of micron‐scale cellular architecture on a Ni wire. The redox treatment of metallic Ni at elevated temperatures allows fast reconstruction of the metal, leading to a cellular structure on the Ni wire. Furthermore, nanocrystalline MnO2 is coated on the microporous Ni wire to form a supercapacitor electrode.