Nguyen Kien, Hoa Nguyen Duc, Hung Chu Manh, Thanh Le Dang Thi, Van Duy Nguyen, Van Hieu Nguyen
International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST) No 1 - Dai Co Viet Str. Hanoi Vietnam
RSC Adv. 2018 May 25;8(35):19449-19455. doi: 10.1039/c8ra02862a.
Metal oxide nanostructures have been extensively used in electrochemical devices due to their advantages, including high active surface area and chemical stability. However, the electrochemical properties of metal oxides are strongly dependent on their structural characteristics. We performed a comparative study on the electrochemical performance of nanoporous nickel oxide (NiO) nanosheets and nanowires. The advanced nanoporous NiO nanomaterials were synthesized by a facile hydrothermal method followed by thermal calcination. The synthesized nanomaterials, as characterized by scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, and nitrogen adsorption/desorption isotherms, demonstrated the nanoporosity and high crystallinity of the NiO nanosheets and nanowires. Cyclic voltammetry measurement was performed using a three-electrode system to evaluate the electrochemical properties of the synthesized materials. Results showed that the nanoporous NiO nanosheets possessed a higher current density than that of the nanowires by approximately ten times. Moreover, the nanoporous NiO nanosheets showed exceptionally high stability of almost 100%, after three cycles in strong alkaline environments, thereby suggesting possible application in electrochemical devices.
金属氧化物纳米结构因其具有高活性表面积和化学稳定性等优点，已被广泛应用于电化学器件中。然而，金属氧化物的电化学性能强烈依赖于其结构特征。我们对纳米多孔氧化镍（NiO）纳米片和纳米线的电化学性能进行了比较研究。先进的纳米多孔NiO纳米材料通过简便的水热法合成，随后进行热煅烧。通过扫描电子显微镜、透射电子显微镜、选区电子衍射、X射线衍射和氮吸附/脱附等温线对合成的纳米材料进行表征，结果表明NiO纳米片和纳米线具有纳米多孔性和高结晶度。使用三电极系统进行循环伏安测量，以评估合成材料的电化学性能。结果表明，纳米多孔NiO纳米片的电流密度比纳米线高约十倍。此外，纳米多孔NiO纳米片在强碱性环境中经过三个循环后，显示出几乎100%的极高稳定性，从而表明其在电化学器件中具有潜在的应用价值。
