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The Oxygen Reduction Reaction at Graphene Modified Electrodes

机译：石墨烯修饰电极上的氧还原反应

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摘要

The oxygen reduction reaction (ORR) is studied in acidic media utilising various graphene modified carbon electrodes including pristine graphene, Graphene Oxide (GO) and Q-Graphene which are compared and contrasted against unmodified edge- and basal- plane pyrolytic graphite electrodes (EPPG and BPPG, respectively). The ORR is found to be highly dependent upon the material's characteristics where a range of activities are observed; in terms of the smallest (least negative) reduction potential, the relative reactivities are ordered as follows: GO>Q-Graphene>EPPG>BPPG>Pristine graphene. This phenomenon is discussed in terms of two parameters: i) the density of oxygenated species present and their composition; and ii) the density of edge plane-like sites. Electrochemical analysis reveals that despite the observed variation in peak potentials from the modification with various graphenes, the underlying ORR mechanism in acidic media proceeds via the 2 electron process forming hydrogen peroxide. Insights from this work are highly important as it allows researchers to understand the electrochemistry of graphene in the ORR which has importance in energy generation and where graphene is used per se and also as fuel cell catalyst supports.
机译：在酸性介质中利用各种石墨烯修饰的碳电极（包括原始石墨烯，氧化石墨烯（GO）和Q-石墨烯）对氧还原反应（ORR）进行了研究，并将其与未修饰的边缘和基面热解石墨电极（EPPG和BPPG）。发现ORR高度依赖于观察到一系列活动的材料特性。就最小（最小负）还原电位而言，相对反应性按如下顺序排列：GO> Q-石墨烯> EPPG> BPPG>原始石墨烯。从两个参数来讨论这种现象：i）存在的氧化物种的密度及其组成; ii）边缘平面状位点的密度。电化学分析表明，尽管观察到峰值电位因各种石墨烯的修饰而发生变化，但酸性介质中潜在的ORR机理仍通过2电子过程进行，形成了过氧化氢。这项工作的见解非常重要，因为它使研究人员能够了解ORR中石墨烯的电化学，这对能源生产，石墨烯本身的用途以及燃料电池催化剂的支持至关重要。

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