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Fabrication of functionalized 3D graphene with controllable micro/meso-pores as a superior electrocatalyst for enhanced oxygen reduction in both acidic and alkaline solutions

机译:用可控微/中孔的官能化3D石墨烯的制造作为优异的电催化剂,用于增强酸性和碱性溶液的氧气减少

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We have synthesized hierarchically 3D porous Fe _(5) C _(2) /N-doped graphene (3D Fe _(5) C _(2) /N-PG) with numerous micro/meso-pores by a controllable and facile strategy. The density of the micro/meso-pores can be accurately tailored by adjusting the reaction conditions. It is found that the ORR performance of the electrocatalyst is strongly dependent on the pore structures under the same conditions. The electrocatalyst exhibits comparable activity in an acidic solution together with superior activity in an alkaline solution to the state-of-the-art Pt/C catalyst in terms of onset potential, half-wave potential, diffusion-limiting current density and kinetic current density. The excellent electrocatalytic activity is attributed to the balance of the surface area, hierarchical porosity, chemical composition (pyridinic N, graphitic N and Fe _(5) C _(2) nanoparticles) and conductivity of the 3D interconnected graphene. This strategy for the tunable synthesis of hierarchically 3D porous graphene materials offers a platform for developing catalysts with superior activity in energy devices.
机译:我们通过可控和轻松合成了具有许多微/中间孔的分层3D多孔Fe _(5)C _(2)/ n掺杂的石墨烯(3D Fe _(5)C _(2)/ N-PG)战略。通过调节反应条件,可以精确地定制微/中孔孔的密度。发现电催化剂的ORR性能强烈依赖于相同条件下的孔结构。电催化剂在酸性溶液中表现出可比较的活性,以及​​在起始电位,半波电位,扩散限制电流密度和动力电流密度方面的最先进的Pt / C催化剂中的碱性溶液中的优异活性。 。优异的电催化活性归因于表面积,分层孔隙率,化学成分(吡啶镍,石墨N和Fe _(5)Cα(2)纳米颗粒)和3D互连石墨烯的电导率。这种用于分层3D多孔石墨烯材料的可调谐合成策略提供了一种用于在能量装置中发育具有优异活性的催化剂的平台。

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