The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction(OER)performance,which has become an effective strategy for constructing the catalytic active phase.However,...The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction(OER)performance,which has become an effective strategy for constructing the catalytic active phase.However,it remains a challenge to understand the mechanisms of reconstruction and to accomplish it fast and deeply.Here,we reported a photo-promoted rapid reconstruction(PRR)process on Ag nanoparticle-loaded amorphous Ni-Fe hydroxide nanosheets on carbon cloth for enhanced OER.The photogenerated holes generated by Ag in conjunction with the anodic potential contributed to a thorough reconstruction of the amorphous substrate.The valence state of unsaturated coordinated Fe atoms,which serve as active sites,is significantly increased,while the corresponding crystalline substrate shows little change.The different structural evolutions of amorphous and crystalline substrates during reconstruction lead to diverse pathways of OER.This PRR utilizing loaded noble metal nanoparticles can accelerate the generation of active species in the substrate and increase the electrical conductivity,which provides a new inspiration to develop efficient catalysts via reconstruction strategies.展开更多
The photo-promoted carbonylation of chloroalkanes with carbon monoxide was carried out under ambient conditions with copper and cadmium salts catalysts. The results indicated that the corresponding esters were produce...The photo-promoted carbonylation of chloroalkanes with carbon monoxide was carried out under ambient conditions with copper and cadmium salts catalysts. The results indicated that the corresponding esters were produced with three salt catalysts, i.e.CuBr2, CuCl2 and CdI2. Among these catalysts, CdI2 was the most efficient in terms of ester yield and selectivity, particularly, 60% yield and 75% selectivity in the carbonylation of chlorocyclohexane were achieved. Furthermore, the yield and selectivity of the ester can be improved greatly by adding tri-n-butylamine in the CuBr2 and CuCl2 catalyst systems. On the other hand, the additive. As a result, we suggest that iodide ion plays an important role in the catalyst system of the cadmium salts.展开更多
共轭羰基化合物由于其良好的离子和电子传输性能以及高度的可逆性,成为研究最为广泛的一类有机电极材料。采用具有3,4,9,10-苝四甲酸二酐为前驱体与氢氧化钠反应制备了3,4,9,10-苝四甲酸四钠盐(Na_4C_(24)H_8O_8,Na-PTCA),作为锂离子电...共轭羰基化合物由于其良好的离子和电子传输性能以及高度的可逆性,成为研究最为广泛的一类有机电极材料。采用具有3,4,9,10-苝四甲酸二酐为前驱体与氢氧化钠反应制备了3,4,9,10-苝四甲酸四钠盐(Na_4C_(24)H_8O_8,Na-PTCA),作为锂离子电池的负极材料。Na-PTCA在50 m A/g的电流密度电压区间0.01~2 V条件下,循环100圈后还能保持468 m A·h/g的容量,表现出良好的循环稳定性。同时,其羧基部分在约1.10/1.38V的电压平台表现高度的循环可逆性,在循环100圈后容量保持为148 m A·h/g。这些结果对扩展新型高比容锂离子电池负极材料提供了一种有效的设计思路。展开更多
基金This work was supported by the National Natural Science Foundation of China(52073008,52272181)the China Postdoctoral Science Foundation(2023T160036).
文摘The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction(OER)performance,which has become an effective strategy for constructing the catalytic active phase.However,it remains a challenge to understand the mechanisms of reconstruction and to accomplish it fast and deeply.Here,we reported a photo-promoted rapid reconstruction(PRR)process on Ag nanoparticle-loaded amorphous Ni-Fe hydroxide nanosheets on carbon cloth for enhanced OER.The photogenerated holes generated by Ag in conjunction with the anodic potential contributed to a thorough reconstruction of the amorphous substrate.The valence state of unsaturated coordinated Fe atoms,which serve as active sites,is significantly increased,while the corresponding crystalline substrate shows little change.The different structural evolutions of amorphous and crystalline substrates during reconstruction lead to diverse pathways of OER.This PRR utilizing loaded noble metal nanoparticles can accelerate the generation of active species in the substrate and increase the electrical conductivity,which provides a new inspiration to develop efficient catalysts via reconstruction strategies.
基金We appreciate the National Natural Science Foundation of China （No. 20372012） for the generous financial support.
文摘The photo-promoted carbonylation of chloroalkanes with carbon monoxide was carried out under ambient conditions with copper and cadmium salts catalysts. The results indicated that the corresponding esters were produced with three salt catalysts, i.e.CuBr2, CuCl2 and CdI2. Among these catalysts, CdI2 was the most efficient in terms of ester yield and selectivity, particularly, 60% yield and 75% selectivity in the carbonylation of chlorocyclohexane were achieved. Furthermore, the yield and selectivity of the ester can be improved greatly by adding tri-n-butylamine in the CuBr2 and CuCl2 catalyst systems. On the other hand, the additive. As a result, we suggest that iodide ion plays an important role in the catalyst system of the cadmium salts.
文摘共轭羰基化合物由于其良好的离子和电子传输性能以及高度的可逆性,成为研究最为广泛的一类有机电极材料。采用具有3,4,9,10-苝四甲酸二酐为前驱体与氢氧化钠反应制备了3,4,9,10-苝四甲酸四钠盐(Na_4C_(24)H_8O_8,Na-PTCA),作为锂离子电池的负极材料。Na-PTCA在50 m A/g的电流密度电压区间0.01~2 V条件下,循环100圈后还能保持468 m A·h/g的容量,表现出良好的循环稳定性。同时,其羧基部分在约1.10/1.38V的电压平台表现高度的循环可逆性,在循环100圈后容量保持为148 m A·h/g。这些结果对扩展新型高比容锂离子电池负极材料提供了一种有效的设计思路。
