Nitrogen-Doped Nanoporous Carbon/Graphene Nano-Sandwiches: Synthesis and Application for Efficient Oxygen Reduction
MetadataShow full item record
A zeolitic-imidazolate-framework (ZIF) nanocrystal layer-protected carbonization route is developed to prepare N-doped nanoporous carbon/graphene nano-sandwiches. The ZIF/graphene oxide/ZIF sandwich-like structure with ultrasmall ZIF nanocrystals (i.e., ≈20 nm) fully covering the graphene oxide (GO) is prepared via a homogenous nucleation followed by a uniform deposition and confined growth process. The uniform coating of ZIF nanocrystals on the GO layer can effectively inhibit the agglomeration of GO during high-temperature treatment (800 °C). After carbonization and acid etching, N-doped nanoporous carbon/graphene nanosheets are formed, with a high specific surface area (1170 m2 g−1). These N-doped nanoporous carbon/graphene nanosheets are used as the nonprecious metal electrocatalysts for oxygen reduction and exhibit a high onset potential (0.92 V vs reversible hydrogen electrode; RHE) and a large limiting current density (5.2 mA cm−2 at 0.60 V). To further increase the oxygen reduction performance, nanoporous Co-Nx/carbon nanosheets are also prepared by using cobalt nitrate and zinc nitrate as cometal sources, which reveal higher onset potential (0.96 V) than both commercial Pt/C (0.94 V) and N-doped nanoporous carbon/graphene nanosheets. Such nanoporous Co-Nx/carbon nanosheets also exhibit good performance such as high activity, stability, and methanol tolerance in acidic media.
Showing items related by title, author, creator and subject.
A General Method for Constructing Two-Dimensional Layered Mesoporous Mono- and Binary-Transition-Metal Nitride/Graphene as an Ultra-Efficient Support to Enhance Its Catalytic Activity and Durability for Electrocatalytic ApplicationLiu, B.; Huo, L.; Si, R.; Liu, Jian; Zhang, J. (2016)© 2016 American Chemical Society. We constructed a series of two-dimensional (2D) layered mesoporous mono- and binary-transition-metal nitride/graphene nanocomposites (TMN/G, TM = Ti, Cr, W, Mo, TiCr, TiW, and TiMo) via ...
Octa(aminophenyl)silsesquioxane derived nitrogen-doped well-defined nanoporous carbon materials: Synthesis and application for supercapacitorsTang, H.; Zeng, Y.; Gao, X.; Yao, B.; Liu, D.; Wu, J.; Qu, D.; Liu, K.; Xie, Z.; Zhang, H.; Pan, M.; Huang, L.; Jiang, San Ping (2016)Development of nitrogen-doped carbon materials with well-defined nanoporous structure is critical due to their versatile applications for the electrochemical energy conversion and storage devices. In this work, we report ...
Duan, X.; O'Donnell, Kane; Sun, Hongqi; Wang, Yuxian; Wang, Shaobin (2015)Sulfur and nitrogen co-doped reduced graphene oxide (rGO) is synthesized bya facile method and demonstrated remarkably enhanced activities in metal-free activation of peroxymonosulfate (PMS) for catalytic oxidation of ...