Hydrogen has been always the hot topic,which drives a lot of researchers to study and explore hydrogenrelated projects and fields.The first subfield is hydrogen production with green and cost-effective means.Some meth...Hydrogen has been always the hot topic,which drives a lot of researchers to study and explore hydrogenrelated projects and fields.The first subfield is hydrogen production with green and cost-effective means.Some methods have been intensively used for high-efficient hydrogen production,i.e.,catalytic chemical hydrogen generation,electrocatalytic hydrogen evolution,photocatalytic hydrogen evolution,photo-electrocatalytic hydrogen evolution.Most of them are driven by various catalysts.Moreover,the hydrogen storage is also an important question,which is also a present research hot topic,although the history is long with several decades.Hydrogen fuel cells have also obtained great attention due to the zero emissions.The related research mainly focuses on the cell systems and electrocatalysts used.Under this background,we invite some excellent research groups to write this progress on hydrogen from production to utilizations.Finally,we believe that this roadmap on hydrogen can give some useful guidance in future research.展开更多
Microstructures of three kinds of typical product states for commercially fabricated alloy 2195 were observed.It is found that the hot-rolled plate is characterized by a fibrous structure containing fine,polygonized s...Microstructures of three kinds of typical product states for commercially fabricated alloy 2195 were observed.It is found that the hot-rolled plate is characterized by a fibrous structure containing fine,polygonized substructures;and the cold-rolled sheet was characterized by a "pan-caked" grain structure containing high density dislocation cells.The product under near peak-aging temper is proved to contain a large amount of dispersive,plate-shaped T1(Al2CuLi) precipitates,together with a small fraction of θ'(Al2Cu) plates,exhibiting a desirable combination of mechanical properties.Analyses using scanning electron microscopy reveal that many coarse,irregular-shaped Al7Cu2Fe constituent particles exist in all product states,which indicates that intermediate heat treatments have little influence on this iron-caused,detrimental phase.The formation and evolution of microstructures for different product states of alloy 2195 were discussed in view point of the commercial production condition.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21763012,22072183,51802157 and 52001079)Changsha Municipal Natural Science Foundation(No.kq2014119)+5 种基金the International Cooperation Program of Jiangsu Province(No.BZ2020063)the Fundamental Research Funds for the Central Universities(No.30921011216)the Natural Science Foundation of Guangxi Province(No.2019GXNSFBA185004)the Civil Aviation Administration of China(No.U1933109)the Project of Education Department of Jilin Province(No.JJKH20210827KJ)Tianjin Natural Science Foundation(No.20JCZDJC00160)。
文摘Hydrogen has been always the hot topic,which drives a lot of researchers to study and explore hydrogenrelated projects and fields.The first subfield is hydrogen production with green and cost-effective means.Some methods have been intensively used for high-efficient hydrogen production,i.e.,catalytic chemical hydrogen generation,electrocatalytic hydrogen evolution,photocatalytic hydrogen evolution,photo-electrocatalytic hydrogen evolution.Most of them are driven by various catalysts.Moreover,the hydrogen storage is also an important question,which is also a present research hot topic,although the history is long with several decades.Hydrogen fuel cells have also obtained great attention due to the zero emissions.The related research mainly focuses on the cell systems and electrocatalysts used.Under this background,we invite some excellent research groups to write this progress on hydrogen from production to utilizations.Finally,we believe that this roadmap on hydrogen can give some useful guidance in future research.
基金supported by the National Key Technologies R&D Program of China during the 10th Five-year Plan Period
文摘Microstructures of three kinds of typical product states for commercially fabricated alloy 2195 were observed.It is found that the hot-rolled plate is characterized by a fibrous structure containing fine,polygonized substructures;and the cold-rolled sheet was characterized by a "pan-caked" grain structure containing high density dislocation cells.The product under near peak-aging temper is proved to contain a large amount of dispersive,plate-shaped T1(Al2CuLi) precipitates,together with a small fraction of θ'(Al2Cu) plates,exhibiting a desirable combination of mechanical properties.Analyses using scanning electron microscopy reveal that many coarse,irregular-shaped Al7Cu2Fe constituent particles exist in all product states,which indicates that intermediate heat treatments have little influence on this iron-caused,detrimental phase.The formation and evolution of microstructures for different product states of alloy 2195 were discussed in view point of the commercial production condition.
