Hung Shang-Chao, Chou Yi-Rong, Dong Cheng-Di, Tsai Kuang-Chung, Yang Wein-Duo
Fuzhou Polytechnic, Fuzhou 350108, China.
Intelligent Technology Research Centre, Fuzhou 350108, China.
Nanomaterials (Basel). 2020 Sep 27;10(10):1933. doi: 10.3390/nano10101933.
Hierarchical porous birnessite-MnO-based nanostructure composite materials were prepared on a nickel foam substrate by a successive ionic layer adsorption and reaction method (SILAR). Following composition with reduced graphene oxide (rGO) and multiwall carbon nanotubes (MWCNTs), the as-obtained MnO, MnO/rGO and MnO/rGO-MWCNT materials exhibited pore size distributions of 2-8 nm, 5-15 nm and 2-75 nm, respectively. For the MnO/rGO-MWCNT material in particular, the addition of MWCNT and rGO enhanced the superb distribution of micropores, mesopores and macropores and greatly improved the electrochemical performance. The as-obtained MnO/rGO-MWCNT/NF electrode showed a specific capacitance that reached as high as 416 F·g at 1 A·g in 1 M NaSO aqueous electrolyte and also an excellent rate capability and high cycling stability, with a capacitance retention of 85.6% after 10,000 cycles. Electrochemical impedance spectroscopy (EIS) analyses showed a low resistance charge transfer resistance for the as-prepared MnO/rGO-MWCNT/NF nanostructures. Therefore, MnO/rGO-MWCNT/NF composites were successfully synthesized and displayed enhanced electrochemical performance as potential electrode materials for supercapacitors.
采用连续离子层吸附反应法（SILAR）在泡沫镍基底上制备了分级多孔水钠锰矿型MnO基纳米结构复合材料。在与还原氧化石墨烯（rGO）和多壁碳纳米管（MWCNTs）复合后，所得的MnO、MnO/rGO和MnO/rGO-MWCNT材料的孔径分布分别为2-8nm、5-15nm和2-75nm。特别是对于MnO/rGO-MWCNT材料，MWCNT和rGO的加入增强了微孔、中孔和大孔的优异分布，并大大提高了电化学性能。所得的MnO/rGO-MWCNT/NF电极在1M NaSO水性电解质中，在1A·g下的比电容高达416F·g，并且还具有优异的倍率性能和高循环稳定性，在10000次循环后电容保持率为85.6%。电化学阻抗谱（EIS）分析表明，所制备的MnO/rGO-MWCNT/NF纳米结构具有低电阻电荷转移电阻。因此，成功合成了MnO/rGO-MWCNT/NF复合材料，并作为超级电容器的潜在电极材料表现出增强的电化学性能。
