Magnesium hydride(MgH_(2)),which possesses high hydrogen density of 7.6 wt%,abundant resource and non-toxicity,has captured intense attention as one of the potential hydrogen storage materials.However,the practical ap...Magnesium hydride(MgH_(2)),which possesses high hydrogen density of 7.6 wt%,abundant resource and non-toxicity,has captured intense attention as one of the potential hydrogen storage materials.However,the practical application of Mg/MgH_(2) system is suffering from high thermal stability,sluggish absorption and desorption kinetics.Herein,two-dimensional(2D) vanadium nanosheets(V_(NS)) were successfully prepared via a facile wet chemical ball milling method and proved to be highly effective on improving the hydrogen storage performance of MgH_(2).For instance,the MgH_(2)+7 wt% V_(NS) composite began to release hydrogen at 187.2℃,152 ℃ lower than that of additive-free MgH_(2).At 300℃,6.3 wt% hydrogen was released from the MgH_(2)+7 wt% V_(NS) composite within 10 min.In addition,the fully dehydrogenated sample could absorb hydrogen even at room temperature under hydrogen pressure of 3.2 MPa.X-ray diffractometer(XRD) and transmission electron microscopy(TEM)results confirmed metallic vanadium served as catalytic unit for facilitating the de/rehydrogenation reaction of MgH_(2).This finding presents an example of facile synthesis of two-dimensional(2D) vanadium with excellent catalysis,which may shed light on future design and preparation of highly effective layered catalysts for hydrogen storage and other energy-related areas.展开更多
Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was de...Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was decreased to 175℃ and 6.7,6.5 and 6.1 wt.%hydrogen could be released within 5,10 and 25 min at 300,275 and 250℃,respectively.Besides,the composite started to take up hydrogen at room temperature and absorbed 2.0 wt.%hydrogen within 30 min at low temperature of 50℃.The hydrogenation activation energy of MgH_(2) was reduced from(72.5±2.7)to(18.8±0.2)kJ/mol after doping with 10 wt.%nano-Mn.In addition,the MgH_(2)+10 wt.%nano-Mn composite exhibited superior cyclic property,maintaining 92%initial capacity after 20 cycles.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51801078)the Natural Science Foundation of Jiangsu Province(No.BK20180986)。
文摘Magnesium hydride(MgH_(2)),which possesses high hydrogen density of 7.6 wt%,abundant resource and non-toxicity,has captured intense attention as one of the potential hydrogen storage materials.However,the practical application of Mg/MgH_(2) system is suffering from high thermal stability,sluggish absorption and desorption kinetics.Herein,two-dimensional(2D) vanadium nanosheets(V_(NS)) were successfully prepared via a facile wet chemical ball milling method and proved to be highly effective on improving the hydrogen storage performance of MgH_(2).For instance,the MgH_(2)+7 wt% V_(NS) composite began to release hydrogen at 187.2℃,152 ℃ lower than that of additive-free MgH_(2).At 300℃,6.3 wt% hydrogen was released from the MgH_(2)+7 wt% V_(NS) composite within 10 min.In addition,the fully dehydrogenated sample could absorb hydrogen even at room temperature under hydrogen pressure of 3.2 MPa.X-ray diffractometer(XRD) and transmission electron microscopy(TEM)results confirmed metallic vanadium served as catalytic unit for facilitating the de/rehydrogenation reaction of MgH_(2).This finding presents an example of facile synthesis of two-dimensional(2D) vanadium with excellent catalysis,which may shed light on future design and preparation of highly effective layered catalysts for hydrogen storage and other energy-related areas.
基金financial supports from the National Natural Science Foundation of China (No. 51801078)the Natural Science Foundation of Jiangsu Province, China (No. BK20180986)。
文摘Mn nanoparticles(nano-Mn)were successfully synthesized and doped into MgH_(2) to improve its de/hydrogenation properties.Compared with MgH_(2),the onset desorption temperature of 10 wt.%nano-Mn modified MgH_(2) was decreased to 175℃ and 6.7,6.5 and 6.1 wt.%hydrogen could be released within 5,10 and 25 min at 300,275 and 250℃,respectively.Besides,the composite started to take up hydrogen at room temperature and absorbed 2.0 wt.%hydrogen within 30 min at low temperature of 50℃.The hydrogenation activation energy of MgH_(2) was reduced from(72.5±2.7)to(18.8±0.2)kJ/mol after doping with 10 wt.%nano-Mn.In addition,the MgH_(2)+10 wt.%nano-Mn composite exhibited superior cyclic property,maintaining 92%initial capacity after 20 cycles.
基金supported by Science and Technology Project of Zhejiang ProvinceChina(No.2015C37121)+2 种基金the Key Science and Technology Project of Yibin MunicipalitySichuan ProvinceChina(No.2015SF036)
文摘本文旨在探讨TRPC6在低氧高二氧化碳性肺动脉平滑肌细胞(pulmonary arterial smooth muscle cells,PASMCs)增殖和凋亡中的作用。原代培养Sprague-Dawley(SD)雄性大鼠PASMCs,采用平滑肌α-肌动蛋白免疫荧光染色法鉴定。选用4~6代的PASMCs,加入无血清DMEM饥饿24 h,随机分为5组:常氧组、低氧高二氧化碳组、DMSO组、TRPC6抑制剂SKF-96365组和TRPC6激动剂OAG组。常氧组置于37°C常氧培养箱(21%O_2,5%CO_2)中培养24 h,其余4组置于37°C低氧高二氧化碳培养箱(5%O_2,6%CO_2)中,用不同药物处理24 h。用逆转录聚合酶链式反应和Western blot分别检测TRPC6 m RNA和蛋白的表达;用CCK-8法检测细胞增殖情况;用原位末端标记法检测细胞凋亡;用Fura 2-AM双波长法检测细胞内Ca^(2+)浓度([Ca^(2+)]i)。结果显示,低氧高二氧化碳条件下,PASMCs的TRPC6 m RNA和蛋白表达上调,[Ca^(2+)]i升高,细胞增殖增加,而凋亡减少;OAG可促进低氧高二氧化碳的上述作用,而SKF-96365能够逆转这些作用。以上结果提示,TRPC6参与了低氧高二氧化碳对PASMCs增殖和凋亡的调节。
