García-Miranda Ferrari Alejandro, Brownson Dale A C, Banks Craig E
Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK.
Manchester Fuel Cell Innovation Centre, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK.
Sci Rep. 2019 Nov 4;9(1):15961. doi: 10.1038/s41598-019-52463-4.
Mono-, few-, and multilayer graphene is explored towards the electrochemical Hydrogen Evolution Reaction (HER). Careful physicochemical characterisation is undertaken during electrochemical perturbation revealing that the integrity of graphene is structurally compromised. Electrochemical perturbation, in the form of electrochemical potential scanning (linear sweep voltammetry), as induced when exploring the HER using monolayer graphene, creates defects upon the basal plane surface that increases the coverage of edge plane sites/defects resulting in an increase in the electrochemical reversibility of the HER process. This process of improved HER performance occurs up to a threshold, where substantial break-up of the basal sheet occurs, after which the electrochemical response decreases; this is due to the destruction of the sheet integrity and lack of electrical conductive pathways. Importantly, the severity of these changes is structurally dependent on the graphene variant utilised. This work indicates that multilayer graphene has more potential as an electrochemical platform for the HER, rather than that of mono- and few-layer graphene. There is huge potential for this knowledge to be usefully exploited within the energy sector and beyond.
研究了单层、少层和多层石墨烯在电化学析氢反应（HER）中的应用。在电化学扰动过程中进行了仔细的物理化学表征，结果表明石墨烯的完整性在结构上受到了损害。在使用单层石墨烯探索HER时，以电化学电位扫描（线性扫描伏安法）形式出现的电化学扰动会在基面表面产生缺陷，从而增加边缘平面位点/缺陷的覆盖率，导致HER过程的电化学可逆性增加。HER性能改善的这一过程会持续到一个阈值，此时基片会发生大量破裂，之后电化学响应会降低；这是由于片层完整性的破坏和导电通路的缺乏。重要的是，这些变化的严重程度在结构上取决于所使用的石墨烯变体。这项工作表明，多层石墨烯作为HER的电化学平台比单层和少层石墨烯更具潜力。这一知识在能源领域及其他领域有巨大的应用潜力。
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