As an ultrathin film preparation method,atomic layer deposition(ALD)has recently found versatile applications in fields beyond semiconductors,such as energy,environment,catalysis and so on.The design,preparation and c...As an ultrathin film preparation method,atomic layer deposition(ALD)has recently found versatile applications in fields beyond semiconductors,such as energy,environment,catalysis and so on.The design,preparation and characterization of thin film applied in the emerging fields have attracted great interests.The development of ALD technique on particles opens up a broad horizon in the advanced nanofabrication.Pioneering applications are exploring conformal coating,porous coating and selective surface modification of nanoparticles.Conformal encapsulation of particles is a major application to protect materials with ultrathin films from being eroded by the external environment while keeping the original properties of the primary particles.Porous coating has been developed to simultaneously expose the particles’surface and provide nanopores,which is another important method that demonstrates its advantages in modification of electrode materials,catalysis and energy applications,etc.Selective ALD takes the method forward in order to precisely control the directionality of decoration sites on the particles and selectively passivate undesired facets,sites,or defects.Such methods provide practical strategies for atomic scale and precise surface functionalization on particles and greatly expand its potential applications.展开更多
Being abundant and active,Fe_(2)O_(3) is suitable for selective oxidation of H_(2)S.However,its practical application is limited due to the poor sulfur selectivity and rapid deactivation.Herein,we report a facile temp...Being abundant and active,Fe_(2)O_(3) is suitable for selective oxidation of H_(2)S.However,its practical application is limited due to the poor sulfur selectivity and rapid deactivation.Herein,we report a facile template-free hydrothermal method to fabricate porousα-Fe_(2)O_(3)/SnO_(2) composites with hierarchical nanoflower that can obviously improve the catalytic performance of Fe_(2)O_(3).It was disclosed that the synergistic effect betweenα-Fe_(2)O_(3) and SnO_(2) promotes the physico-chemical properties ofα-Fe_(2)O_(3)/SnO_(2) composites.Specifically,the electron transfer between the Fe^(2+)/Fe^(3+)and Sn^(2+)/Sn^(4+)redox couples enhances the reducibility ofα-Fe_(2)O_(3)/SnO_(2) composites.The number of oxygen vacancies is improved when the Fe cations incorporate into SnO_(2) structure,which facilitates the adsorption and activation of oxygen species.Additionally,the porous structure improves the accessibility of H_(2) S to active sites.Among the composites,Fe1 Sn1 exhibits complete H_(2) S conversion with 100%sulfur selectivity at 220℃,better than those of pureα-Fe_(2)O_(3) and SnO2.Moreover,Fe1 Sn1 catalyst shows high stability and water resistance.展开更多
基金supported by the National Natural Science Foundation of China(51835005,51702106,51871103,51575217)Wuhan Science and Technology Plan(2018010401011286)。
文摘As an ultrathin film preparation method,atomic layer deposition(ALD)has recently found versatile applications in fields beyond semiconductors,such as energy,environment,catalysis and so on.The design,preparation and characterization of thin film applied in the emerging fields have attracted great interests.The development of ALD technique on particles opens up a broad horizon in the advanced nanofabrication.Pioneering applications are exploring conformal coating,porous coating and selective surface modification of nanoparticles.Conformal encapsulation of particles is a major application to protect materials with ultrathin films from being eroded by the external environment while keeping the original properties of the primary particles.Porous coating has been developed to simultaneously expose the particles’surface and provide nanopores,which is another important method that demonstrates its advantages in modification of electrode materials,catalysis and energy applications,etc.Selective ALD takes the method forward in order to precisely control the directionality of decoration sites on the particles and selectively passivate undesired facets,sites,or defects.Such methods provide practical strategies for atomic scale and precise surface functionalization on particles and greatly expand its potential applications.
基金supported by the National Natural Science Fund for Distinguished Young Scholars of China(No.21825801)National Natural Science Foundation of China(Nos.21677036,21878052 and 21773030)。
文摘Being abundant and active,Fe_(2)O_(3) is suitable for selective oxidation of H_(2)S.However,its practical application is limited due to the poor sulfur selectivity and rapid deactivation.Herein,we report a facile template-free hydrothermal method to fabricate porousα-Fe_(2)O_(3)/SnO_(2) composites with hierarchical nanoflower that can obviously improve the catalytic performance of Fe_(2)O_(3).It was disclosed that the synergistic effect betweenα-Fe_(2)O_(3) and SnO_(2) promotes the physico-chemical properties ofα-Fe_(2)O_(3)/SnO_(2) composites.Specifically,the electron transfer between the Fe^(2+)/Fe^(3+)and Sn^(2+)/Sn^(4+)redox couples enhances the reducibility ofα-Fe_(2)O_(3)/SnO_(2) composites.The number of oxygen vacancies is improved when the Fe cations incorporate into SnO_(2) structure,which facilitates the adsorption and activation of oxygen species.Additionally,the porous structure improves the accessibility of H_(2) S to active sites.Among the composites,Fe1 Sn1 exhibits complete H_(2) S conversion with 100%sulfur selectivity at 220℃,better than those of pureα-Fe_(2)O_(3) and SnO2.Moreover,Fe1 Sn1 catalyst shows high stability and water resistance.
