Graphene oxide electrochemistry: the electrochemistry of graphene oxide modified electrodes reveals coverage dependent beneficial electrocatalysis.
Graphene oxide electrochemistry: the electrochemistry of graphene oxide modified electrodes reveals coverage dependent beneficial electrocatalysis.
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DOI：
10.1098/rsos.171128
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发表时间：
2017-11
影响因子：
3.5
通讯作者：
Banks CE
中科院分区：
文献类型：
--
作者：
Brownson DAC;Smith GC;Banks CE
电极表面的改性被广泛实施，以尝试和改善电子转移动力学和表面相互作用，最近使用石墨烯相关材料。目前，“原样”氧化石墨烯（GO）的使用在很大程度上被忽视，绝大多数研究人员选择将GO还原为石墨烯或将其用作复合电极的一部分。在本文中，“原样”GO探索和电化学表征使用一系列电化学氧化还原探针，即亚铁氰化钾（II），N，N，N′，N′-四甲基对苯二胺（TMPD），多巴胺盐酸盐和肾上腺素。此外，通过循环伏安法探索了GO对盐酸多巴胺和肾上腺素的电分析功效。GO的电化学响应以原始石墨烯和边缘平面/基面热解石墨（分别为EPPG和BPPG）替代物为基准，其中GO显示出增强的电化学/电分析响应。当使用GO作为电极材料时，本文研究的分析物的电化学响应偏离预期的电化学响应，并表现出改变的电化学响应。包含GO的含氧物质强烈影响并支配所观察到的伏安法，这是至关重要的覆盖度依赖性。观察到GO电催化，这归因于在特定情况下指示响应的有益的含氧物质的存在，证明了要实现的有利的电分析的潜力。然而，注意，由于边缘平面位点和含氧物质的协同作用，在GO改性电极处观察到关键的基于覆盖的区域。我们报告了GO的真正有益的电化学，其具有“原样”有益地用于各种电化学应用的巨大潜力，而不是简单地用作制造石墨烯的前体，并且确实是石墨烯家族的迷人成员。
The modification of electrode surfaces is widely implemented in order to try and improve electron transfer kinetics and surface interactions, most recently using graphene related materials. Currently, the use of ‘as is’ graphene oxide (GO) has been largely overlooked, with the vast majority of researchers choosing to reduce GO to graphene or use it as part of a composite electrode. In this paper, ‘as is’ GO is explored and electrochemically characterized using a range of electrochemical redox probes, namely potassium ferrocyanide(II), N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD), dopamine hydrochloride and epinephrine. Furthermore, the electroanalytical efficacy of GO is explored towards the sensing of dopamine hydrochloride and epinephrine via cyclic voltammetry. The electrochemical response of GO is benchmarked against pristine graphene and edge plane-/basal plane pyrolytic graphite (EPPG and BPPG respectively) alternatives, where the GO shows an enhanced electrochemical/electroanalytical response. When using GO as an electrode material, the electrochemical response of the analytes studied herein deviate from that expected and exhibit altered electrochemical responses. The oxygenated species encompassing GO strongly influence and dominate the observed voltammetry, which is crucially coverage dependent. GO electrocatalysis is observed, which is attributed to the presence of beneficial oxygenated species dictating the response in specific cases, demonstrating potential for advantageous electroanalysis to be realized. Note however, that crucial coverage based regions are observed at GO modified electrodes, owing to the synergy of edge plane sites and oxygenated species. We report the true beneficial electrochemistry of GO, which has enormous potential to be beneficially used in various electrochemical applications ‘as is’ rather than be simply used as a precursor to making graphene and is truly a fascinating member of the graphene family.
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影响因子：
4.2
作者：
Figueiredo-Filho, Luiz C. S.;Brownson, Dale A. C.;Banks, Craig E.
通讯作者：
Banks, Craig E.
影响因子：
4.5
作者：
Davies, TJ;Moore, RR;Compton, RG
通讯作者：
Compton, RG
影响因子：
4.3
作者：
Ambrosi, Adriano;Bonanni, Alessandra;Pumera, Martin
通讯作者：
Pumera, Martin
影响因子：
4.3
作者：
Eng, Alex Yong Sheng;Ambrosi, Adriano;Pumera, Martin
通讯作者：
Pumera, Martin
影响因子：
6.7
作者：
Brownson, Dale A. C.;Varey, Sarah A.;Banks, Craig E.
通讯作者：
Banks, Craig E.