(searched for: doi:10.1016/j.jcis.2020.11.058)
Journal of Electroanalytical Chemistry; doi:10.1016/j.jelechem.2021.115562
The research and develpoment of biomass waste derived carbon materials have attracted tremendous research interests in fabrication of high performance electrochemical sensors. In this work, noble metal NPs (i.e., Pd, Au and Ag) loading on Loofah sponge-derived well-ordered macroporous carbon (OMC)/N-doped carbon thin layer (N-C) was designed by a general approach. This polydopamine (PDA)-based method has the advantages of simplicity, high efficiency and versatility. In virtue of the synergistic contribution from 3D macroporous carbon scaffold and highly active nobel metal NPs, these as-prepared [email protected]/N-C, [email protected]/N-C and [email protected]/N-C electrode exhibit excellent electrochemical sensing performances for H2O2 reduction, glucose oxidation and nitrite oxidation, respectively. Thus, 3D OMC/N-C loaded noble metal nanoparticles are promising materials for a wide spectrum of electrochemical sensor and biosensor applications.
Carbon, Volume 183, pp 415-427; doi:10.1016/j.carbon.2021.07.040
The introduction of heteroatom is a practical tactic that can enhance the ability of carbon materials to store Na+. In this article, N, O, P co-doped hierarchical porous carbon (NOPC) is produced via co-carbonization with phytic acid and soybean protein as precursors. Phytic acid, as a multifunctional additive, macroscopically promotes the formation of a hierarchical pore structure in which micropores and mesopores coexist. It is necessary for the transmission of Na+ and penetration of electrolytes. It microscopically regulates different types of surface functional groups, induces defects to enhance the spacing between graphite layers, and enhances the adsorption and intercalation capacity of Na+. The macroscopic and microscopic co-working changes the NOPC to have a reversible capacity of 359.5 mA h g−1 at 0.05 A g−1. Using density functional theory, it is confirmed that the co-doping of N/O/P can increase the capture capacity of Na+ and reduce the diffusion barrier of carbon materials. Ex-situ XRD, ex-situ Raman and ex-situ TEM were used to verify the structural stability and cycle stability of the NOPC. This study is based on experimental design and theoretical calculations used to prove that synthesis strategy is an effective method for preparing heteroatom-doped carbon with excellent capacity to store sodium.
Carbon, Volume 178, pp 273-284; doi:10.1016/j.carbon.2021.03.042
Core-shell [email protected](3,4-ethylenedioxythiophene) (PEDOT) microspheres are compounded with reduced graphene oxide (rGO) to prepare [email protected]/rGO composite as an efficient electromagnetic (EM) wave absorber. The microstructure, element composition, morphology and saturation magnetization are characterized, and EM wave absorption properties are analyzed in the frequency range of 2.0–18.0 GHz. The results show that PEDOT is polymerized on the surface of Fe3O4 microspheres, and prepared core-shell microspheres are supported on rGO nanosheets. The reflection loss (RL) of [email protected]/rGO composite is −48.8 dB at 9.12 GHz, and effective absorption bandwidth (EAB) (RL < −10 dB) is 4.32 GHz, when the matching thickness is 2.9 mm. Additionally, when the matching thickness is 2.1 mm, the EAB covers 7.20 GHz. The excellent absorption performance benefits from good impedance matching, attenuation characteristic, synergistic effect of dielectric and magnetic loss, and the absorption mechanism is explained in detail in the article. Furthermore, radar cross section (RCS) analysis is adopted to simulate and calculate EM scattering performance of Al metal plate with absorption coating. The results demonstrate that [email protected]/rGO composite exhibits enhanced absorption performance and can be used as an excellent EM wave absorber.