Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH_(2)/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreat...Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH_(2)/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreatments,an inert environment,and long hours of physical ball milling for high homogeneity and synergistic effects.CaH_(2)also inhibits the hydrolysis reaction by forming its products on the Al/Si surface,which hinders the direct utilization of composites.This work represents the first investigation of NaH-CaH_(2)(Al/Si)fuel composites,which greatly overcome these limitations and can be directly used for on-site hydrogen generation and proton exchange membrane(PEM)fuel cells.The NaH-CaH_(2)(Al/Si)fuel composites were prepared by using a straightforward mixing method with variable composition ratios,showing high H_(2)yield and fuel cell(FC)performance.NaH addition provides the bridge effect,which opens up a new way to enable efficient hydrolysis and greatly enhances the hydrolysis activity of CaH_(2)/(Al/Si)composites.The novel fuel composites(NaH-CaH_(2)/Al)have extraordinary FC performance and a 0.42 W/cm2 peak power density greater than commercial hydrogen generators.It provides high H_(2)yield 84.4%for NaH-CaH_(2)/Al and 82%for NaH-CaH_(2)/Si compared to NaOH-CaH_(2)(Al/Si),NaCl-CaH_(2)(Al/Si),and KCl-CaH_(2)(Al/Si)composites.The NaH bridge effect hinders the direct water contact and stops the formation of Ca(OH)2 around Al/Si,which provides adequate pathways for the CaH_(2)(Al/Si)hydrolysis.The impressive capabilities of novel fuel composites are anticipated to offer practical uses in fuel cells,automobile applications,and portable/on-board H_(2)generation.展开更多
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financial support granted by the National Natural Science Foundation of China (No. 22402225)the Gusu Innovation and Entrepreneurship Leading Talent Plan(No. ZXL2023193)+2 种基金the Sinano Talents Plan (No. 2022000175)the Guangdong Basic and Applied Basic Research Foundation (No.2023A1515111133)the ANSO Scholarship for Young Talents
文摘Inorganic materials can solve transportable and on-site hydrolytic hydrogen generation issues.CaH_(2)/(Al/Si)composites are preferable due to their notable chemical properties.However,these composites require pretreatments,an inert environment,and long hours of physical ball milling for high homogeneity and synergistic effects.CaH_(2)also inhibits the hydrolysis reaction by forming its products on the Al/Si surface,which hinders the direct utilization of composites.This work represents the first investigation of NaH-CaH_(2)(Al/Si)fuel composites,which greatly overcome these limitations and can be directly used for on-site hydrogen generation and proton exchange membrane(PEM)fuel cells.The NaH-CaH_(2)(Al/Si)fuel composites were prepared by using a straightforward mixing method with variable composition ratios,showing high H_(2)yield and fuel cell(FC)performance.NaH addition provides the bridge effect,which opens up a new way to enable efficient hydrolysis and greatly enhances the hydrolysis activity of CaH_(2)/(Al/Si)composites.The novel fuel composites(NaH-CaH_(2)/Al)have extraordinary FC performance and a 0.42 W/cm2 peak power density greater than commercial hydrogen generators.It provides high H_(2)yield 84.4%for NaH-CaH_(2)/Al and 82%for NaH-CaH_(2)/Si compared to NaOH-CaH_(2)(Al/Si),NaCl-CaH_(2)(Al/Si),and KCl-CaH_(2)(Al/Si)composites.The NaH bridge effect hinders the direct water contact and stops the formation of Ca(OH)2 around Al/Si,which provides adequate pathways for the CaH_(2)(Al/Si)hydrolysis.The impressive capabilities of novel fuel composites are anticipated to offer practical uses in fuel cells,automobile applications,and portable/on-board H_(2)generation.
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.
