在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组...在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组成、形貌及结构进行分析,以亚甲基蓝(MB)为降解有机污染物目标,降解MB溶液前后的浓度比值(ct/c0)为评价指标,对催化剂种类及催化剂的用量进行了优化研究。结果表明,TiO2/MoS2@硅藻土复合催化剂稳定性高,催化活性强,1 mg/mL该复合催化剂降解50 mL 3~10 mg/L的MB溶液,ct/c0值范围为0.015~0.048。降解过程符合一级反应动力学Langmuir-Hinshelwood方程。展开更多
1 Introduction Supercapacitor also called electrochemical capacitor,has become one of the most promising energy storage devices due to its long service life,great power density,high energy density,green environmental ...1 Introduction Supercapacitor also called electrochemical capacitor,has become one of the most promising energy storage devices due to its long service life,great power density,high energy density,green environmental protection(Simon et al,2008;Ma et al,2013).Based on the charge storage mechanisms,Supercapacitors can be divided into展开更多
以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步...以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步沉淀法使Mn的加入量增加到0 66%,醇时空产率明显增加。以浸渍法按化学计量加入Mn助剂考察其含量对催化剂合成醇性能的影响,当Mn Mo(原子比)为1 5时,反应条件为315℃,9 5MPa,6000h-1,醇时空产率和醇选择性分别达到最高值0 338g mL·h和69 6%。300h的稳定性测试结果表明,共沉淀法改性的催化剂具有良好的稳定性。展开更多
Van der Waals （vdW） heterojunctions are equipped to avert dangling bonds due to weak, inter-layer vdW force, and ensure strong in-plane covalent bonding for two-dimensional layered structures. We fabricated four het...Van der Waals （vdW） heterojunctions are equipped to avert dangling bonds due to weak, inter-layer vdW force, and ensure strong in-plane covalent bonding for two-dimensional layered structures. We fabricated four heterojunctions devices of different layers based on p-type distorted 1T-MX2 ReSe2 and n-type hexagonal MoS2 nanoflakes, and measured their electronic and optoelectronic properties. The device showed a high rectification coefficient of 500 for the diode, a high ON/OFF ratio and higher electron mobility for the field-effect transistor （FET） compared with the individual components, and a high current responsivity （Rλ） and external quantum efficiency （EQE） of 6.75 A/W and 1,266%, respectively, for the photodetector.展开更多
文摘在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组成、形貌及结构进行分析,以亚甲基蓝(MB)为降解有机污染物目标,降解MB溶液前后的浓度比值(ct/c0)为评价指标,对催化剂种类及催化剂的用量进行了优化研究。结果表明,TiO2/MoS2@硅藻土复合催化剂稳定性高,催化活性强,1 mg/mL该复合催化剂降解50 mL 3~10 mg/L的MB溶液,ct/c0值范围为0.015~0.048。降解过程符合一级反应动力学Langmuir-Hinshelwood方程。
基金financial support from the National Natural Science Foundation of China(51274015)National Program on Key Basic Research Project (973 Program) (2014CB846000)Test Fund of Peking University
文摘1 Introduction Supercapacitor also called electrochemical capacitor,has become one of the most promising energy storage devices due to its long service life,great power density,high energy density,green environmental protection(Simon et al,2008;Ma et al,2013).Based on the charge storage mechanisms,Supercapacitors can be divided into
文摘以不同的添加方式在Ni K MoS2催化剂中加入Mn助剂,考察其合成醇反应性能。结果表明,Mn Ni K MoS2催化剂具有较好的合成低碳混合醇反应性能。共沉淀法以醋酸锰为前驱体加入0 26%的Mn助剂后,C+2醇含量,醇时空产率及选择性均明显提高;分步沉淀法使Mn的加入量增加到0 66%,醇时空产率明显增加。以浸渍法按化学计量加入Mn助剂考察其含量对催化剂合成醇性能的影响,当Mn Mo(原子比)为1 5时,反应条件为315℃,9 5MPa,6000h-1,醇时空产率和醇选择性分别达到最高值0 338g mL·h和69 6%。300h的稳定性测试结果表明,共沉淀法改性的催化剂具有良好的稳定性。
基金This work was supported by the ＂Hundred Talents Program＂ of Chinese Academy of Sciences （CAS）,the National Natural Science Foundation of China （No. 91233120）, and the CAS/SAFEA International Partnership Program for Creative Research Teams.
文摘Van der Waals （vdW） heterojunctions are equipped to avert dangling bonds due to weak, inter-layer vdW force, and ensure strong in-plane covalent bonding for two-dimensional layered structures. We fabricated four heterojunctions devices of different layers based on p-type distorted 1T-MX2 ReSe2 and n-type hexagonal MoS2 nanoflakes, and measured their electronic and optoelectronic properties. The device showed a high rectification coefficient of 500 for the diode, a high ON/OFF ratio and higher electron mobility for the field-effect transistor （FET） compared with the individual components, and a high current responsivity （Rλ） and external quantum efficiency （EQE） of 6.75 A/W and 1,266%, respectively, for the photodetector.
