CVD Graphene/Ni Interface Evolution in Sulfuric Electrolyte

Abstract

Systems comprising single and multilayer graphene deposited on metals and immersed in acid environments have been investigated, with the aim of elucidating the mechanisms involved, for instance, in hydrogen production or metal protection from corrosion. In this work, a relevant system, namely chemical vapor deposited (CVD) multilayer graphene/Ni (MLGr/Ni), is studied when immersed in a diluted sulfuric electrolyte. The MLGr/Ni electrochemical and morphological properties are studied in situ and interpreted in light of the highly oriented pyrolytic graphite (HOPG) electrode behavior, when immersed in the same electrolyte. Following this interpretative framework, the dominant role of the Ni substrate in hydrogen production is clarified.

Interlayer Bound Wannier Excitons in Germanium Sulfide

“…Over the past two decades, a wide range of layered/2D materials has been under extensive experimental and theoretical scrutiny because of their stability, interesting chemical and physical properties, the possibility to be exfoliated or grown in ultra-thin films, and the potentiality to realize flexible electronic and opto-electronic devices [1][2][3][4][5][6][7][8][9][10]. Among them, the family of group-IV monochalcogenides recently started to raise interest both at experimental and theoretical level.…”

Bilayer Graphene: From Stacking Order to Growth Mechanisms

“…Its advantage lies in that it can control the growth of graphene by controlling various growth conditions such as substrate, [62] precursor, and growth parameters. [63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] CVD graphene has many precursors and deposited substrates to be chosen. The most commonly used deposition substrates are copper, nickel, and Ni-Cu alloys, [51,80] and the most commonly used carbon source is gaseous methane.…”

“…It is the most commonly used method for preparing nanomaterials, especially for preparing carbon materials. Its advantage lies in that it can control the growth of graphene by controlling various growth conditions such as substrate, precursor, and growth parameters . CVD graphene has many precursors and deposited substrates to be chosen.…”

Challenges for continuous graphene as a corrosion barrier

“…In particular, since wrinkles can run through the whole coating (Chae et al, 2009), from the top to the bottom graphene layer, and are likely to contain a number of defects due to their curvature, we considered the possibility of acid leaking through in such regions, hence reaching the Ni surface (Yivlialin et al, 2018). Although grain boundaries in different graphene layers do not necessarily overlap, they cannot be excluded (Hong et al, 2014, Ambrosi et al, 2013.…”