title: Functionalization of biomass carbonaceous aerogels: selective preparation of MnO2@CA composites for supercapacitors.
abstract: Functionalized porous carbon materials with hierarchical structure and developed porosity coming from natural and renewable biomass have been attracting tremendous attention recently. In this work, we present a facile and scalable method to synthesize MnO2 loaded carbonaceous aerogel (MnO2@CA) composites via the hydrothermal carbonaceous (HTC) process. We employ two reaction systems of the mixed metal ion precursors to study the optimal selective adsorption and further reaction of MnO2 precursor on CA. Our experimental results show that the system containing KMnO4 and Na2S2O3·5H2O exhibits better electrochemical properties compared with the reaction system of MnSO4·H2O and (NH4)2S2O8. For the former, the obtained MnO2@CA displays the specific capacitance of 123.5 F·g(-1). The enhanced supercapacitance of MnO2@CA nanocomposites could be ascribed to both electrochemical contributions of the loaded MnO2 nanoparticles and the porous structure of three-dimensional carbonaceous aerogels. This study not only indicates that it is vital for the reaction systems to match with porous carbonaceous materials, but also offers a new fabrication strategy to prepare lightweight and high-performance materials that can be used in energy storage devices.
authors.affiliation: College of Materials Science and Engineering, Zhengzhou University , Zhengzhou 450052, People's Republic of China.
authors.forename: Yumei
authors.initials: Y
authors.lastname: Ren
authors.forename: Qun
authors.initials: Q
authors.lastname: Xu
authors.forename: Jianmin
authors.initials: J
authors.lastname: Zhang
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yang
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Daoyuan
authors.initials: D
authors.lastname: Yang
authors.forename: Junhua
authors.initials: J
authors.lastname: Hu
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D018533:Biomass; D002244:Carbon / Q000737:chemistry; D025802:Electric Capacitance; D011211:Electric Power Supplies; D004563:Electrochemistry; D017895:Manganese Compounds / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D016062:Porosity
chemical_list: D017895:Manganese Compounds; D010087:Oxides; C027424:manganese oxide; D002244:Carbon