Department of Physics, Harbin Institute of Technology, Yikuang Street 2#, Harbin, Heilongjiang, 150001, PR China.
School of Mechatronic Engineering, Daqing Normal University, Daqing, Heilongjiang, 163712, PR China.
ChemSusChem. 2018 Mar 9;11(5):985-993. doi: 10.1002/cssc.201701886. Epub 2018 Feb 13.
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 H , CO, and O 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 MnO is coated on the microporous Ni wire (MPNW) to form a supercapacitor electrode. The MnO /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.
具有大的表面积/体积比和优异导电性的多孔金属材料具有广泛的应用前景，因此受到了广泛的研究。开发一种简便且具有成本效益的制造多孔金属结构的方法非常理想，而制造微/纳多孔结构则更为理想。本文提出了一种在 Ni 金属前驱体上原位制备微米级细胞结构的直接火焰策略。火焰提供了所需的热量，同时还用作燃料重整器，为还原处理金属 Ni 提供了 H 、 CO 和 O 的混合气体。在高温下的氧化还原过程允许金属快速重构，从而在 Ni 丝上形成细胞结构。该工艺简单、清洁，避免了使用牺牲材料或模板。此外，在微孔 Ni 丝（MPNW）上涂覆纳米晶 MnO 以形成超级电容器电极。MnO/MPNW 电极和相应的纤维状超级电容器表现出高比电容和优异的循环稳定性。此外，这项工作为各种应用（包括催化、储能和转换以及化学传感）中多孔金属和合金的制造提供了一种新策略。
