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
This study evaluates the impact of the Pani Panchayat initiative, a community-based water management program, in the Angul and Dhenkanal districts of Odisha. Utilizing a mixed-methods approach, we gathered qualitative...This study evaluates the impact of the Pani Panchayat initiative, a community-based water management program, in the Angul and Dhenkanal districts of Odisha. Utilizing a mixed-methods approach, we gathered qualitative and quantitative data through structured interviews with diverse stakeholders, focus group discussions, and surveys. The findings indicate that the Angul district exhibited higher levels of fair elections and improved water access due to better canal maintenance, while the Dhenkanal district faced challenges from industrial water usage. The study also examines the potential of technological advancements, such as real-time water monitoring, to enhance governance. By identifying synergies and gaps with existing water policies, the research provides policy recommendations to promote sustainable water management in alignment with the Sustainable Development Goals 2030.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.
文摘This study evaluates the impact of the Pani Panchayat initiative, a community-based water management program, in the Angul and Dhenkanal districts of Odisha. Utilizing a mixed-methods approach, we gathered qualitative and quantitative data through structured interviews with diverse stakeholders, focus group discussions, and surveys. The findings indicate that the Angul district exhibited higher levels of fair elections and improved water access due to better canal maintenance, while the Dhenkanal district faced challenges from industrial water usage. The study also examines the potential of technological advancements, such as real-time water monitoring, to enhance governance. By identifying synergies and gaps with existing water policies, the research provides policy recommendations to promote sustainable water management in alignment with the Sustainable Development Goals 2030.
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.
