Unique nanofoams consisting of interweaved ultrathin graphene confining Zn–N–C dipoles (ZnNG) are constructed via calcination of Zn-coordinated precursor.Due to the introduction of local polar Zn–N–C configuration...Unique nanofoams consisting of interweaved ultrathin graphene confining Zn–N–C dipoles (ZnNG) are constructed via calcination of Zn-coordinated precursor.Due to the introduction of local polar Zn–N–C configurations,with hypersensitivity for mechanical stress,the piezoelectricity is created on the nonpiezoelectric graphene,and the hierarchical ZnNG exhibits obvious piezocatalytic activity of water splitting for H_(2) production even under mild agitation.The corresponding rate of H_(2) production is about 14.65 μmol g^(-1)h^(-1).It triggers a breakthrough in piezocatalytic H_(2) evolution under low-frequency vibration,and takes a significant step forward for piezocatalysis towards practical applications.Furthermore,the presented concept of confining atomic polar configuration for engineering piezoelectricity would open up new horizon for constructing new-type piezoelectrics based on both piezoelectric and nonpiezoelectric materials.展开更多
基金supported by the National Natural Science Foundation of China (21802007)the Natural Science Foundation of Hunan Province (2020JJ5615)+1 种基金the Scientific Research Project of Hunan Provincial Department of Education (20B066)the Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment (SKLPEE-202001), Fuzhou University。
文摘Unique nanofoams consisting of interweaved ultrathin graphene confining Zn–N–C dipoles (ZnNG) are constructed via calcination of Zn-coordinated precursor.Due to the introduction of local polar Zn–N–C configurations,with hypersensitivity for mechanical stress,the piezoelectricity is created on the nonpiezoelectric graphene,and the hierarchical ZnNG exhibits obvious piezocatalytic activity of water splitting for H_(2) production even under mild agitation.The corresponding rate of H_(2) production is about 14.65 μmol g^(-1)h^(-1).It triggers a breakthrough in piezocatalytic H_(2) evolution under low-frequency vibration,and takes a significant step forward for piezocatalysis towards practical applications.Furthermore,the presented concept of confining atomic polar configuration for engineering piezoelectricity would open up new horizon for constructing new-type piezoelectrics based on both piezoelectric and nonpiezoelectric materials.
基金This work was supported by the National Natural Science Foundation of China （Nos. 21376060 and 21676068） and the Natural Science Foundation of Hebei Province （No. B2014201024）.
文摘一张新奇的嘴扔了分层的双氢氧化物(LDH ) 涂的 ferroferric 氧化物(Fe <sub>3</sub > O <sub>4</sub>@LDH@NiB) 磁性的核心壳 nanocomposite 被一起沉淀和受精减小的联合成功地制作。在 Fe <sub>3</sub 期间 > O <sub>4</sub>@LDH 准备，一条灵巧的没有模板的途径被采用介绍 LDH 壳，它是比为总是需要介绍并且搬迁模板的 mesoporous 材料的准备的常规方法更有效的。结果的 Fe <sub>3</sub > O <sub>4</sub>@LDH 有一个相对高的表面区域和丰富的表面氢氧根组，它能吸附金属离子，使，驱散并且稳定活跃 Ni 种类有利由 TEM， XPS，英尺红外和赌注描述的 demonstraed。因此，它与两个都来临到 100% 的变换和选择在苯乙烯的酸的选择加氢展出了好活动到 hydrocinnamic 酸。尤其是，获得的 Fe <sub>3</sub > O <sub>4</sub>@LDH@NiB 能被一个外部磁场容易分开并且没有它的起始的催化活动的可估计的损失，再循环十一次。
