Process On是一个免费的在线协作绘图平台,提供多人协作绘图功能。笔者利用Process On进行教学实践,发展学生的合作学习能力,通过问卷调查法了解合作学习能力的提升情况。调查结果显示,通过完成中国历代都城变迁的任务,学生的合作学习...Process On是一个免费的在线协作绘图平台,提供多人协作绘图功能。笔者利用Process On进行教学实践,发展学生的合作学习能力,通过问卷调查法了解合作学习能力的提升情况。调查结果显示,通过完成中国历代都城变迁的任务,学生的合作学习能力显著提升。展开更多
The purposeful and sensible fabrication of novel binary-shelled photocatalysts is highly attractive for photocatalytic hydrogen evolution.In this work,ZnIn_(2)S_(4)(ZIS)nanosheets were induced to grow on a framework o...The purposeful and sensible fabrication of novel binary-shelled photocatalysts is highly attractive for photocatalytic hydrogen evolution.In this work,ZnIn_(2)S_(4)(ZIS)nanosheets were induced to grow on a framework of Pd-porphyrin MOFs(Pd-PMOFs)to construct novel binary-shelled nanotubes(Pd-PMOFs@ZIS)via a multistep solvothermal process.On account of the abundant active sites,well-matched band gaps,strong visible light harvesting capability and outstanding charge migration efficiency,the assembled Pd-PMOFs@ZIS heterostructures exhibited prominently enhanced photocatalytic hydrogen generation activity.Concretely,the hydrogen evolution rate of the optimized sample was up to 8200.25μmol g^(−1) h^(−1) under visible light irradiation,which was approximately 24.07 and 13.73 times larger than those of individual ZIS and Pd-PMOFs,respectively.More importantly,density functional theory(DFT)calculations demonstrated that the fabrication of the heterojunctions established electron transport channels with Pd and In ions showing strong covalent bonding,and the electrons were converged and consumed at the interfaces between Pd-PMOFs and ZIS.Specifically,the transfer pathway of electrons is from Pd-PMOFs to ZIS.Our work provides a convenient and advanced prototype for synthesizing binary heterojunction photocatalysts with superior charge separation and transfer efficiency.展开更多
基金supported by the National Natural Science Foundation of China(21971050).
文摘The purposeful and sensible fabrication of novel binary-shelled photocatalysts is highly attractive for photocatalytic hydrogen evolution.In this work,ZnIn_(2)S_(4)(ZIS)nanosheets were induced to grow on a framework of Pd-porphyrin MOFs(Pd-PMOFs)to construct novel binary-shelled nanotubes(Pd-PMOFs@ZIS)via a multistep solvothermal process.On account of the abundant active sites,well-matched band gaps,strong visible light harvesting capability and outstanding charge migration efficiency,the assembled Pd-PMOFs@ZIS heterostructures exhibited prominently enhanced photocatalytic hydrogen generation activity.Concretely,the hydrogen evolution rate of the optimized sample was up to 8200.25μmol g^(−1) h^(−1) under visible light irradiation,which was approximately 24.07 and 13.73 times larger than those of individual ZIS and Pd-PMOFs,respectively.More importantly,density functional theory(DFT)calculations demonstrated that the fabrication of the heterojunctions established electron transport channels with Pd and In ions showing strong covalent bonding,and the electrons were converged and consumed at the interfaces between Pd-PMOFs and ZIS.Specifically,the transfer pathway of electrons is from Pd-PMOFs to ZIS.Our work provides a convenient and advanced prototype for synthesizing binary heterojunction photocatalysts with superior charge separation and transfer efficiency.
