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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Universal monolayer mesoporous graphene coatings on diverse substrates with atomically dispersed metal sites for
Hao Wang1, Qingfu Cai2, Yifan Gao2
1State Key Laboratory of Porous Materials for Separation and Conversion, Department of Chemistry, and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, China.
Abstract:
Carbon coating on conductive supports is an effective strategy to enhance surface area and interfacial functionality without compromising intrinsic electrical properties. However, constructing ordered mesoporous carbon shells in a universal and scalable manner remains challenging. Herein, we report a molecular-assembly-enabled strategy for the universal growth of conformal monolayer mesoporous graphene coatings on a wide range of substrates, including carbon nanotubes (CNTs), graphene oxide (GO), carbon fibers (CFs), boron nitride (BN), SiO2, and silicon wafers. Metal oxide nanocrystal arrays serve as removable templates to generate oleate-derived carbon shells that evolve into highly graphitized mesoporous graphene after annealing, while leaving atomically dispersed metal species embedded within the carbon framework. These heteroatom-coordinated metal sites provide abundant lithiophilic and electrochemically active centers, enabling uniform lithium nucleation and suppressed dendrite growth, thereby reducing nucleation overpotential and improving cycling stability. This work offers a versatile platform for integrating ordered porosity, high conductivity, and atomic-scale interfacial functionality into carbon-supported energy materials.
