title: Co3O4nanoparticles anchored on nitrogen-doped reduced graphene oxide as a multifunctional catalyst for H2O2reduction, oxygen reduction and evolution reaction.
abstract: This study describes a facile and effective route to synthesize hybrid material consisting of Co3O4nanoparticles anchored on nitrogen-doped reduced graphene oxide (Co3O4/N-rGO) as a high-performance tri-functional catalyst for oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and H2O2sensing. Electrocatalytic activity of Co3O4/N-rGO to hydrogen peroxide reduction was tested by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry. Under a reduction potential at -0.6 V to H2O2, this constructing H2O2sensor exhibits a linear response ranging from 0.2 to 17.5 mM with a detection limit to be 0.1 mM. Although Co3O4/rGO or nitrogen-doped reduced graphene oxide (N-rGO) alone has little catalytic activity, the Co3O4/N-rGO exhibits high ORR activity. The Co3O4/N-rGO hybrid demonstrates satisfied catalytic activity with ORR peak potential to be -0.26 V (vs. Ag/AgCl) and the number of electron transfer number is 3.4, but superior stability to Pt/C in alkaline solutions. The same hybrid is also highly active for OER with the onset potential, current density and Tafel slope to be better than Pt/C. The unusual catalytic activity of Co3O4/N-rGO for hydrogen peroxide reduction, ORR and OER may be ascribed to synergetic chemical coupling effects between Co3O4, nitrogen and graphene.
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Chuansheng
authors.initials: C
authors.lastname: He
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Fengzhan
authors.initials: F
authors.lastname: Sun
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Manchao
authors.initials: M
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Peng
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Jiahui
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing, 100048, China.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Lin