Calcium hydride(CaH_(2))is a hydrogen storage material with high hydrogen storage density that is easy to transport and store.However,its hydrogen generation process is intense and liquid water causes uneven reactions...Calcium hydride(CaH_(2))is a hydrogen storage material with high hydrogen storage density that is easy to transport and store.However,its hydrogen generation process is intense and liquid water causes uneven reactions in CaH_(2).These two issues make the reaction of CaH_(2) hard to control.To resolve the issues,a gel/nonwoven fabric composite material was prepared using nonwoven fabric and poly(vinyl alcohol)/polyacrylamide(PVA/PAM)hydrogel,and applied to a compact hydrogen generator.Water absorption and evaporation tests on composite membranes confirm that the membrane can control the water transport rate by adjusting the gel content,thereby regulating the hydrogen production of CaH_(2).During the hydrolysis of CaH_(2),the heat released promotes water evaporation,which absorbs some of this heat and helps maintain both temperature and water balance.When the gel content was 10%,the height of the separator was 1 mm,and the mass of CaH_(2) was 1.5 g,the hydrogen generator achieved the fastest hydrogen production rate of 58.7 mL/min.Moreover,after expanding the size of the hydrogen generator,it can continuously produce hydrogen for over 260 min at room temperature.Finally,hydrogen was supplied to a proton exchange membrane fuel cell(PEMFC)stack.This research provides a new concept for controllable hydrogen production and portable fuel cells.展开更多
基金supported by the National Natural Science Foundation of China(No.22402225)the Science and Technology Foundation of Jiangsu Province(No.BK20240472)+3 种基金the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515111133)the Gusu Innovation and Entrepreneurship Leading Talent Plan(No.ZXL2023193)the Sinano talents plan(No.2022000175)CAS H2 Technology(Suzhou)Co.,Ltd.(No.E341150301)。
文摘Calcium hydride(CaH_(2))is a hydrogen storage material with high hydrogen storage density that is easy to transport and store.However,its hydrogen generation process is intense and liquid water causes uneven reactions in CaH_(2).These two issues make the reaction of CaH_(2) hard to control.To resolve the issues,a gel/nonwoven fabric composite material was prepared using nonwoven fabric and poly(vinyl alcohol)/polyacrylamide(PVA/PAM)hydrogel,and applied to a compact hydrogen generator.Water absorption and evaporation tests on composite membranes confirm that the membrane can control the water transport rate by adjusting the gel content,thereby regulating the hydrogen production of CaH_(2).During the hydrolysis of CaH_(2),the heat released promotes water evaporation,which absorbs some of this heat and helps maintain both temperature and water balance.When the gel content was 10%,the height of the separator was 1 mm,and the mass of CaH_(2) was 1.5 g,the hydrogen generator achieved the fastest hydrogen production rate of 58.7 mL/min.Moreover,after expanding the size of the hydrogen generator,it can continuously produce hydrogen for over 260 min at room temperature.Finally,hydrogen was supplied to a proton exchange membrane fuel cell(PEMFC)stack.This research provides a new concept for controllable hydrogen production and portable fuel cells.
