Electrochemical responses of flexible graphite in H2SO4

Abstract

Asymmetric capacitors are gaining attention due to their hybrid nature with higher power and energy density compared to individual batteries or capacitors. Electrochemical and structural characteristics of flexible graphite in 40% H 2 SO 4 electrolyte are investigated using electrochemical and microscopy techniques. There is a correlation between intercalation of electrolyte and the enlargement of interlayer spacing and electrochemical response. Conditions favoring planar orientation are electrochemically less active and more stable in such corrosive electrolytes. There are response variations between plain and resin-impregnated flexible graphite samples. The reaction peak seems to be reversible for resin impregnated samples while plain samples show continuous intercalation. The higher positive potential limit in cyclic voltammetry causes peak potential to increase in orders of magnitudes.

Solid‐Supported Catalysts for Organic Functional Group Transformations

“…Graphite support can be used as a fuel cell electrode owing to its chemical stability, electrical and thermal strength, and superior mechanical characteristics. [78] Many types of carbon materials, including carbon black, graphite oxide, activated carbon, and carbon fibers (CFs), have been used as support materials. In all of these materials, graphene is the fundamental component, aside from wellstructured ones like fullerene, carbon nanotubes, graphene, and graphite.…”

“…For example, expanded/modified graphite can be used in gas reactions and electrocatalytic activity. Graphite support can be used as a fuel cell electrode owing to its chemical stability, electrical and thermal strength, and superior mechanical characteristics [78] …”

Extremely efficient and stable hydrogen evolution by a Pt/NiOx composite film deposited on a nickel foam using a mixed metal-imidazole casting method

“…7 Development of efficient and robust electrocatalysts for the hydrogen evolution reaction (HER) is indispensable for H 2 production via water splitting. 8 Although a large variety of precious [9][10][11][12][13][14][15] and nonprecious [16][17][18][19][20][21][22][23] materials have been developed for the electrocatalytic HER so far, platinum-based materials are still the best electrocatalysts for the HER from H 3 O + or H 2 O under acidic or alkaline conditions, respectively, 24 due to their optimum d-band center with ideal adsorption/desorption energies for reactive intermediates. 13,[25][26][27] However, the high cost, scarcity, and instability (alkaline conditions) of platinum are practical issues for their application to large-scale and commercial systems for water splitting.…”

A highly efficient and stable platinum film deposited via a mixed metal-imidazole casting method as a benchmark cathode for electrocatalytic hydrogen evolution

“…[7][8][9][10] Development of efficient and stable electrocatalysts to improve the HER from water is indispensable for the future H 2 production technology. Although a large variety of materials including precious [11][12][13][14][15][16][17][18][19][20][21][22][23][24] and nonprecious [25][26][27][28][29][30] metals have been developed for efficient electrocatalytic HER so far, platinum-based materials are still the most active catalysts due to their optimal binding ability with hydrogen atoms. 22,31,32 On this account, the common Pt-based electrodes of commercially available Pt/C and the Pt plate are used as benchmark cathodes for electrocatalytic water splitting.…”