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Investigation on electrocatalytic performance and material degradation of an N-doped grapheneMOF nanocatalyst in emulated electrochemical environments

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2023年第3期1卷 360-375页

作者： Niladri Talukder Yudong Wang Bharath Babu Nunna Xiao Tong Jorge Anibal Boscoboinik Eon Soo Lee Advanced Energy Systems and Microdevices Laboratory Department of Mechanical and Industrial EngineeringNew Jersey Institute of TechnologyNewarkNJ07102USA Department of Mechanical Engineering Weber State UniversityOgdenUtah84408USA The Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNew York 11973USA

To develop graphene-based nanomaterials as reliable catalysts for electrochemical energy conversion and storage systems(*** fuel cells,metal–air batteries,etc.),it is imperative to critically understand their performance changes and correlated material degradation processes under different operational *** these systems,hydrogen peroxide(H_(2)O_(2))is often an inevitable byproduct of the catalytic oxygen reduction reaction,which can be detrimental to the catalysts,electrodes,and electrolyte ***,we studied how the electrocatalytic performance changes for a heterogeneous nanocatalyst named nitrogen-doped graphene integrated with a metal–organic framework(N-G/MOF)by the effect of H_(2)O_(2),and correlated the degradation process of the catalyst in terms of the changes in elemental compositions,chemical bonds,crystal structures,and *** catalyst samples were treated with five different concentrations of H_(2)O_(2) to emulate the operational conditions and examined to quantify the changes in electrocatalytic performances in an alkaline medium,elemental composition and chemical bonds,crystal structure,and *** electrocatalytic performance considerably declined as the H_(2)O_(2) concentration reached above 0.1 *** XPS analyses suggest the formation of different oxygen functional groups on the material surface,the breakdown of the material's C–C bonds,and a sharp decline in pyridinic-N functional groups due to gradually harsher H_(2)O_(2) *** higher concentrations,the H_(2)O_(2)-derived radicals altered the crystalline and morphological features of the catalyst.

关键词： Nitrogen-doped graphene-based electrocatalyst Metal-organic framework hydrogen peroxide effect on catalyst Electrocatalytic performance Material degradation

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