title: Hollow-structured conjugated porous polymer derived Iron/Nitrogen-codoped hierarchical porous carbons as highly efficient electrocatalysts.
abstract: Iron and nitrogen (Fe/N) co-doped porous carbons have already shown great potential as electrocatalysts for oxygen reduction reaction in alkaline media. However, it still remains a great challenge to finely integrate a hierarchical porous structure and Fe/N co-doping effect into one material at the same time. In this work, a rational design toward Fe/N-codoped hierarchical porous carbon spheres was developed by the formation of an iron-porphyrin-containing conjugated microporous polymer sphere with hollow structure (HCMP) through a silica sphere template directed condensation of pyrrole and 1,4-phthalaldehyde, then etched with NaOH, and treated with FeCl2. The resulting HCMP-Fe polymer was readily converted to a series of Fe/N co-doped hierarchical porous carbons (HPC-Fe/N-X, X=700-900) upon pyrolysis at different temperatures and etching treatment. These porous carbons exhibit the high specific surface areas up to 518m2g-1and the contents of N and Fe up to 3.28at.% and 0.85wt.%, respectively. Benefiting from the high surface area, Fe/N co-doping character, HPC-Fe/N-700 exhibited excellent electrochemical catalytic performance for oxygen reduction reaction under alkaline condition (0.1M KOH) with a low half-wave potential (0.84V), a dominant four-electron transfer mechanism (n=3.89 at 0.65V), as well as a high diffusion limiting current density (JL=5.19mAcm-2), comparable to those porous carbon-based ORR catalysts with excellent electrochemical performance.
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China.
authors.forename: Wenbei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China.
authors.forename: Tianlu
authors.initials: T
authors.lastname: Cui
authors.affiliation: iHuman Institute, ShanghaiTech University, 100 Haike Road, Pudong, 201210 Shanghai, China.
authors.forename: Lingyun
authors.initials: L
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Cai
authors.affiliation: Key Lab for Advanced Materials, Institute of Applied Chemistry, East China University of Science and Technology, 130 Meilong Road, 200237 Shanghai, China.
authors.forename: Sai
authors.initials: S
authors.lastname: Sun
authors.affiliation: Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, 200062 Shanghai, China.
authors.forename: Yefeng
authors.initials: Y
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China. Electronic address: zhuang@sjtu.edu.cn.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zhuang
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China. Electronic address: fan-zhang@sjtu.edu.cn.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
keywords: Conjugated microporous polymer; Fe/N-doping; Hierarchical porous carbon; Hollow sphere; Oxygen reduction reaction