Hierarchical nitrogen-doped carbon nanocages （hNCNC） with large specific surface areas were used as a catalyst support to immobilize Pt nanoparticles by a microwave-assisted polyol method. The Pt/hNCNC catalyst with...Hierarchical nitrogen-doped carbon nanocages （hNCNC） with large specific surface areas were used as a catalyst support to immobilize Pt nanoparticles by a microwave-assisted polyol method. The Pt/hNCNC catalyst with 20 wt% loading has a homogeneous dispersion of Pt nanoparticles with the average size of 3.3 nm, which is smaller than 4.3 and 4.9 nm for the control catalysts with the same loading supported on hierarchical carbon nanocages （hCNC） and commercial Vulcan XC-72, respec- tively. Accordingly, Pt/hNCNC has a larger electrochemical surface area than Pt/hCNC and Pt/XC-72. The Pt/hNCNC catalyst exhibited excellent electrocatalytic activity and stability for methanol oxidation, which was better than the control catalysts. This was attributed to the en- hanced interaction between Pt and hNCNC due to nitrogen participation in the anchoring function. By making use of the unique advantages of the hNCNC support, a heavy Pt loading up to 60 wt% was prepared without serious agglomeration, which gave a high peak-current density per unit mass of catalyst of 95.6 mA/mg for achieving a high power density. These results showed the potential of the Pt/hNCNC catalyst for methanol oxidation and of the new hNCNC support for wide applications.展开更多
Graphitic carbon nitride(g-C_(3)N_(4),denoted as CN)has gained significant attention for its potential applications in treating environmental pollutants due to its unique microstructure and chemical properties.In this...Graphitic carbon nitride(g-C_(3)N_(4),denoted as CN)has gained significant attention for its potential applications in treating environmental pollutants due to its unique microstructure and chemical properties.In this study,porous CN co-doped with Co and Mo(Co/Mo-CN)was successfully synthesized using a convenient thermal polymerization method involving polyoxometalate precursor of(NH_(4))_(4)[Co(Ⅱ)Mo_(6)O_(24)H_(6)](CoMo_(6)).The single-source precursor of CoMo_(6)was not only as a pore forming agent by oxidation etching,but also as a bimetallic doping source.Compared with pristine CN(P-CN),Co/Mo-CN possessed more advantages,such as high specific surface area,plentiful exposed active sites,extending the light absorption capability,rapid separation of photogenerated charge carriers,narrowed bandgap and more negative conduction band potential.As expected,the Co/Mo-CN exhibited a significant enhancement of adsorption ability for cationic dyes and photoreduction Cr(Ⅵ)under visible light irradiation compared to P-CN.This research opened a new pathway designing multifunctional CN-based materials.展开更多
基金supported by the National Natural Science Foundation of China(21473089,51232003,21373108,51571110,21573107)the Nation-al Basic Research Program of China(973 Program,2013CB932902)+2 种基金Suzhou Science and Technology Projects(ZXG2013025)Changzhou Science and Technology Projects(CE20130032)supported by a Project Funded by the Technology Support Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Hierarchical nitrogen-doped carbon nanocages （hNCNC） with large specific surface areas were used as a catalyst support to immobilize Pt nanoparticles by a microwave-assisted polyol method. The Pt/hNCNC catalyst with 20 wt% loading has a homogeneous dispersion of Pt nanoparticles with the average size of 3.3 nm, which is smaller than 4.3 and 4.9 nm for the control catalysts with the same loading supported on hierarchical carbon nanocages （hCNC） and commercial Vulcan XC-72, respec- tively. Accordingly, Pt/hNCNC has a larger electrochemical surface area than Pt/hCNC and Pt/XC-72. The Pt/hNCNC catalyst exhibited excellent electrocatalytic activity and stability for methanol oxidation, which was better than the control catalysts. This was attributed to the en- hanced interaction between Pt and hNCNC due to nitrogen participation in the anchoring function. By making use of the unique advantages of the hNCNC support, a heavy Pt loading up to 60 wt% was prepared without serious agglomeration, which gave a high peak-current density per unit mass of catalyst of 95.6 mA/mg for achieving a high power density. These results showed the potential of the Pt/hNCNC catalyst for methanol oxidation and of the new hNCNC support for wide applications.
基金supported by Science and Technology Development Project of Jilin Province(YDZJ202301ZYTS313)Doctoral Research Initiation Fund Project of Jilin Engineering(BSKJ201918)
文摘Graphitic carbon nitride(g-C_(3)N_(4),denoted as CN)has gained significant attention for its potential applications in treating environmental pollutants due to its unique microstructure and chemical properties.In this study,porous CN co-doped with Co and Mo(Co/Mo-CN)was successfully synthesized using a convenient thermal polymerization method involving polyoxometalate precursor of(NH_(4))_(4)[Co(Ⅱ)Mo_(6)O_(24)H_(6)](CoMo_(6)).The single-source precursor of CoMo_(6)was not only as a pore forming agent by oxidation etching,but also as a bimetallic doping source.Compared with pristine CN(P-CN),Co/Mo-CN possessed more advantages,such as high specific surface area,plentiful exposed active sites,extending the light absorption capability,rapid separation of photogenerated charge carriers,narrowed bandgap and more negative conduction band potential.As expected,the Co/Mo-CN exhibited a significant enhancement of adsorption ability for cationic dyes and photoreduction Cr(Ⅵ)under visible light irradiation compared to P-CN.This research opened a new pathway designing multifunctional CN-based materials.
