本文通过利用基于钴金属有机骨架材料(ZIF-67)的高表面积和良好的结晶度作为前驱体,通过氮气气氛高温煅烧后形成C-ZIF-67材料,并通过原位聚合法,在C-ZIF-67材料表面生长密度均匀的聚苯胺(PANI)化合物,最终获得C-ZIF-67/PANI复合材料。采...本文通过利用基于钴金属有机骨架材料(ZIF-67)的高表面积和良好的结晶度作为前驱体,通过氮气气氛高温煅烧后形成C-ZIF-67材料,并通过原位聚合法,在C-ZIF-67材料表面生长密度均匀的聚苯胺(PANI)化合物,最终获得C-ZIF-67/PANI复合材料。采用CV、GCD和EIS电化学技术研究了C-ZIF-67/PANI复合电极在1 M硫酸电解液中的储能性能。最终表明,C-ZIF-67/PANI5复合电极可提供450.5 F g−1的比电容,并且在电流密度为8 A g−1下经过5000次的充放电循环测试后,比电容值仍保持初始比电容值的71%,表现其良好的循环稳定性。In this paper, the cobalt metal-organic framework material (ZIF-67) with high surface area and good crystallinity was used as the precursor. The C-ZIF-67 material was formed after calcination at high temperature under N2 atmosphere. Then, through the in-situ polymerization method, the polyaniline (PANI) compound with a uniform density was grown on the surface of the C-ZIF-67 material, and finally the C-ZIF-67/PANI composite material was obtained. The electrochemical techniques such as cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) were employed to investigate the energy storage performance of the C-ZIF-67/PANI composite electrode in 1 M sulfuric acid electrolyte. Eventually, it was demonstrated that the C-ZIF-67/PANI5 composite electrode could provide a specific capacitance of 450.5 F g⁻¹, and after 5000 charge-discharge cycling tests at a current density of 8 A g⁻¹, the specific capacitance value still remained 71% of the initial specific capacitance value, indicating its good cyclic stability.展开更多
Polyaniline （PANI）, polyaniline/titanium dioxide （PANI/TiO2）, polyaniline/tin oxide （PANI/SnO2） and polyaniline/indium oxide （PANI/In203） thin films were developed by using an in-situ self-assembly method at ...Polyaniline （PANI）, polyaniline/titanium dioxide （PANI/TiO2）, polyaniline/tin oxide （PANI/SnO2） and polyaniline/indium oxide （PANI/In203） thin films were developed by using an in-situ self-assembly method at -10℃. Chemical structure, optical property and morphology of all the thin films were characterized by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, UV-Vis absorption spectroscopy, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. NH3 gas-sensing properties of PANI and PANI nanocomposite thin films were examined at ambient temperature. The results showed that all the sensors composed of PANI nanocomposite thin films had faster response/recovery rate with better reproducibility, selectivity and long-term stability to NH3 than PANI,thiS film sensor, and PANI/TiO2 nanocomposite thin film sensor showed optimum NH3 gas-sensing characteristics. The effect of humidity on the responses of all the sensors was also investigated.展开更多
文摘本文通过利用基于钴金属有机骨架材料(ZIF-67)的高表面积和良好的结晶度作为前驱体,通过氮气气氛高温煅烧后形成C-ZIF-67材料,并通过原位聚合法,在C-ZIF-67材料表面生长密度均匀的聚苯胺(PANI)化合物,最终获得C-ZIF-67/PANI复合材料。采用CV、GCD和EIS电化学技术研究了C-ZIF-67/PANI复合电极在1 M硫酸电解液中的储能性能。最终表明,C-ZIF-67/PANI5复合电极可提供450.5 F g−1的比电容,并且在电流密度为8 A g−1下经过5000次的充放电循环测试后,比电容值仍保持初始比电容值的71%,表现其良好的循环稳定性。In this paper, the cobalt metal-organic framework material (ZIF-67) with high surface area and good crystallinity was used as the precursor. The C-ZIF-67 material was formed after calcination at high temperature under N2 atmosphere. Then, through the in-situ polymerization method, the polyaniline (PANI) compound with a uniform density was grown on the surface of the C-ZIF-67 material, and finally the C-ZIF-67/PANI composite material was obtained. The electrochemical techniques such as cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) were employed to investigate the energy storage performance of the C-ZIF-67/PANI composite electrode in 1 M sulfuric acid electrolyte. Eventually, it was demonstrated that the C-ZIF-67/PANI5 composite electrode could provide a specific capacitance of 450.5 F g⁻¹, and after 5000 charge-discharge cycling tests at a current density of 8 A g⁻¹, the specific capacitance value still remained 71% of the initial specific capacitance value, indicating its good cyclic stability.
基金supported by the National Natural Science Foundation of China under grant Nos.60425101 and 60736005
文摘Polyaniline （PANI）, polyaniline/titanium dioxide （PANI/TiO2）, polyaniline/tin oxide （PANI/SnO2） and polyaniline/indium oxide （PANI/In203） thin films were developed by using an in-situ self-assembly method at -10℃. Chemical structure, optical property and morphology of all the thin films were characterized by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, UV-Vis absorption spectroscopy, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. NH3 gas-sensing properties of PANI and PANI nanocomposite thin films were examined at ambient temperature. The results showed that all the sensors composed of PANI nanocomposite thin films had faster response/recovery rate with better reproducibility, selectivity and long-term stability to NH3 than PANI,thiS film sensor, and PANI/TiO2 nanocomposite thin film sensor showed optimum NH3 gas-sensing characteristics. The effect of humidity on the responses of all the sensors was also investigated.
