title: A new method for developing defect-rich graphene nanoribbons/onion-like carbon@Co nanoparticles hybrid materials as an excellent catalyst for oxygen reactions.
abstract: Herein, a novel material with an excellent electrocatalytic activity for the oxygen reduction reaction (ORR), composed of onion-like carbon@Co nanoparticles (NPs) incorporated on defect-rich N-doped graphene nanoribbons (C@Co-NGR), is prepared via a combination of nitric acid etching and subsequent high-temperature treatment of the as-synthesized C@Co-N doped carbon nanotubes. The as-prepared C@Co-NGR exhibits excellent electrocatalytic activity for the ORR in 0.10 M KOH with a half-wave potential of 0.830 V (vs. a reversible hydrogen electrode, RHE), which is 21 mV more positive than that of a commercial 20 wt% Pt/C catalyst. Moreover, it shows a higher stability and better methanol tolerance than the commercial Pt/C catalyst in alkaline solution, with almost no shift in the ORR polarization curve after 3000 cycles and no change of the ORR peak in the cyclic voltammogram in the presence of 1.0 M methanol. Most importantly, the C@Co-NGR also exhibits a comparable activity for the oxygen evolution reaction (OER) in 0.10 M KOH solution, in which the overpotential needed to achieve a current density of 10 mA cm-2is 410 mV, comparable to that of the state-of-the-art commercial RuO2catalyst (370 mV, vs. RHE). This makes the C@Co-NGR one of the best non-precious-metal catalyst for OER and ORR in alkaline solution ever reported.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China. jbjia@ciac.ac.cn and University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Wenxiu
authors.initials: W
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China. jbjia@ciac.ac.cn and University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Lulu
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China. jbjia@ciac.ac.cn and University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Xiangjian
authors.initials: X
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China. jbjia@ciac.ac.cn.
authors.forename: Jianbo
authors.identifier: http://orcid.org/0000-0003-0671-1527
authors.initials: J
authors.lastname: Jia
authors.affiliation: Department of Materials Science & Engineering, & Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China. guosj@pku.edu.cn.
authors.forename: Shaojun
authors.identifier: http://orcid.org/0000-0002-5941-414X
authors.initials: S
authors.lastname: Guo