Used as high-performance electrodes,both structural and compositional alterations of carbon materials play very important roles in energy conversion/storage devices.Especially in supercapacitors,hierarchical pores and...Used as high-performance electrodes,both structural and compositional alterations of carbon materials play very important roles in energy conversion/storage devices.Especially in supercapacitors,hierarchical pores and heteroatom doping in carbon materials are indispensable.Here the rambutan-like hierarchically porous carbon microspheres(PCMs)have been constructed via a hydrothermal treatment,followed by carbonization/activation.The hierarchically porous microstructure is composed of three-dimensional porous carbon networks,which give rise to a large surface area.Moreover,N and O functional groups are introduced in the as-prepared samples,which could generate the extra pseudocapacitance.Benefitting from the interconnected hierarchical and open structure,PCM exhibits outstanding capacitive performance,for example,superior specific capacitance and rate capability(397 and 288 F g^(−1) at 0.5 and 20A g^(−1),respectively),as well as long cycling stability(about 95%capacitance retention after 10,000 cycles).These encouraging results may pave an efficient way to fabricate advanced supercapacitors in the future.展开更多
S-scheme heterojunctions have promising applications in photocatalytic CO_(2) reduction due to their unique structure and interfacial interactions,but improving their carrier separation efficiency and CO_(2) adsorptio...S-scheme heterojunctions have promising applications in photocatalytic CO_(2) reduction due to their unique structure and interfacial interactions,but improving their carrier separation efficiency and CO_(2) adsorption capacity remains a challenge.In this work,highly dispersed MOF-BiOBr/Mn_(0.2) Cd_(0.8) S(MOF-BiOBr/MCS)S-scheme heterojunctions with high photocatalytic CO_(2) reduction performance were constructed.The intimate contact between the MCS nano-spheres and the nanosheet-assembled MOF-BiOBr rods,driven by the internal electric field,accelerates the charge transfer along the S-scheme pathway.Moreover,the high specific surface area of MOFs is preserved to provide abundant active sites for reaction/adsorption.The formation of MOF-BiOBr/MCS S-scheme heterojunction is confirmed by theoretical calculations.The optimum MOF-BiOBr/MCS shows excellent activity in CO_(2) reduction,affording a high CO evolution rate of 60.59µmol h^(−1) g^(−1).The present work can inspire the exploration for the construction of effective heterostructure photocatalysts for photoreduction CO_(2).展开更多
基金The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(Grant Nos.21965007,51671062,and 51871065)the Guangxi Natural Science Foundation(Grant No.2018GXNSFFA281005)+1 种基金the Scientific Research and Technology Development Program of Guangxi(Grant Nos.AA19182014 and AA17202030-1)Guangxi Bagui Scholar Foundation,Guangxi Advanced Functional Materials Foundation and Application Talents Small Highlands,and Chinesisch-Deutsche Kooperationsgruppe(Grant No.GZ1528).
文摘Used as high-performance electrodes,both structural and compositional alterations of carbon materials play very important roles in energy conversion/storage devices.Especially in supercapacitors,hierarchical pores and heteroatom doping in carbon materials are indispensable.Here the rambutan-like hierarchically porous carbon microspheres(PCMs)have been constructed via a hydrothermal treatment,followed by carbonization/activation.The hierarchically porous microstructure is composed of three-dimensional porous carbon networks,which give rise to a large surface area.Moreover,N and O functional groups are introduced in the as-prepared samples,which could generate the extra pseudocapacitance.Benefitting from the interconnected hierarchical and open structure,PCM exhibits outstanding capacitive performance,for example,superior specific capacitance and rate capability(397 and 288 F g^(−1) at 0.5 and 20A g^(−1),respectively),as well as long cycling stability(about 95%capacitance retention after 10,000 cycles).These encouraging results may pave an efficient way to fabricate advanced supercapacitors in the future.
基金supported by the National Natural Science Foundation of China(Nos.22278169 and 51973078)the Excellent scientific research and innovation team of Education Department of Anhui Province(No.2022AH010028)+1 种基金the Major projects of Education Department of Anhui Province(No.2022AH040068)the Key Foundation of Educational Commission of Anhui Province(No.2022AH050396).
文摘S-scheme heterojunctions have promising applications in photocatalytic CO_(2) reduction due to their unique structure and interfacial interactions,but improving their carrier separation efficiency and CO_(2) adsorption capacity remains a challenge.In this work,highly dispersed MOF-BiOBr/Mn_(0.2) Cd_(0.8) S(MOF-BiOBr/MCS)S-scheme heterojunctions with high photocatalytic CO_(2) reduction performance were constructed.The intimate contact between the MCS nano-spheres and the nanosheet-assembled MOF-BiOBr rods,driven by the internal electric field,accelerates the charge transfer along the S-scheme pathway.Moreover,the high specific surface area of MOFs is preserved to provide abundant active sites for reaction/adsorption.The formation of MOF-BiOBr/MCS S-scheme heterojunction is confirmed by theoretical calculations.The optimum MOF-BiOBr/MCS shows excellent activity in CO_(2) reduction,affording a high CO evolution rate of 60.59µmol h^(−1) g^(−1).The present work can inspire the exploration for the construction of effective heterostructure photocatalysts for photoreduction CO_(2).
