Co@C/CoOx coupled with N-doped layer-structured carbons for excellent CO2 capture and oxygen reduction reaction

Huayang Zhang, Wenjie Tian, Zhao Qian, Tianhong Ouyang, Martin Saunders, Jingyu Qin, Shaobin Wang, Moses O. Tadé, Hongqi Sun

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Current environmental and energy issues urge the advance of stable and cost-effective porous nanostructures for highly efficient electrochemical energy conversion/storage, and gas adsorption/separation. Herein, we report a one-pot, scalable pyrolysis process for fabrication of hierarchically layer-structured porous carbons with nitrogen doping and cobalt modification (Co-N-PCs) for efficient high-pressure CO2 gas adsorption and oxygen reduction reaction (ORR). Co-N-PCs possess large specific surface areas and abundant layered macropores containing micropores and narrow mesopores, coupled with core-shell Co@C/CoOx structure. Co-N-PC 800 (synthesized at 800 °C) shows a high CO2 capture capability of 18.5 mmol g−1 at 10 bar (0 °C) and an outstanding catalytic activity for ORR. Density functional theory (DFT) calculations reveal that the cobalt cores inside graphene layers powerfully promote electron transfer from Co to surrounding C atoms, which work together with doped N to create superior catalytically active sites in the graphene shells. In addition, the negative charge states of C induced in N-doped Co@C structure contribute to the capture of CO2.

Original languageEnglish
Pages (from-to)306-315
Number of pages10
JournalCarbon
Volume133
DOIs
Publication statusPublished - 1 Jul 2018

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