title: Nitrogen-Doped Holey Graphene Film-Based Ultrafast Electrochemical Capacitors.
abstract: The commercialized aluminum electrolytic capacitors (AECs) currently used for alternating current (AC) line-filtering are usually the largest components in the electronic circuits because of their low specific capacitances and bulky sizes. Herein, nitrogen-doped holey graphene (NHG) films were prepared by thermal annealing the composite films of polyvinylpyrrolidone (PVP), graphene oxide (GO), and ferric oxide (Fe2O3) nanorods followed by chemical etching with hydrochloride acid. The typical electrochemical capacitor with NHG electrodes exhibited high areal and volumetric specific capacitances of 478 μF cm(-2) and 1.2 F cm(-3) at 120 Hz, ultrafast frequency response with a phase angle of -81.2° and a resistor-capacitor time constant of 203 μs at 120 Hz, as well as excellent cycling stability. Thus, it is promising to replace conventional AEC for AC line-filtering in miniaturized electronics.
authors.affiliation: Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
authors.forename: Qinqin
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
authors.forename: Miao
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
authors.forename: Ji
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Incheon National University , Incheon 406772, South Korea.
authors.forename: Jong-Dal
authors.initials: JD
authors.lastname: Hong
authors.affiliation: Department of Chemistry, Tsinghua University , Beijing 100084, People's Republic of China.
authors.forename: Gaoquan
authors.initials: G
authors.lastname: Shi
keywords: AC line-filtering; holey graphene; meso-/macropores; nitrogen doping; ultrafast electrochemical capacitors