Influence of cation chemical composition and structure on the double layer capacitance for Bi(111)|room temperature ionic liquid interface

The electrochemical characteristics of the mixture of 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium iodide

“…For more concentrated EMImI + EMImBF 4 solutions (2%, 5%) C is much lower, which could be explained by the partial charge transfer process between I À ions and bismuth surface (compared to the more dilute solutions) and by the possible electrode blocking by the strongly adsorbed I À ions increasing the series resistance of interface (obtained from impedance data, discussed later) [5][6][7][8][9][10][11][12][13][14]. The same effect has been observed in several studies in the presence of specifically adsorbed halide ions at Bi single crystal planes from aqueous and non-aqueous electrolyte solutions [33,4]. Also the lower C values can be caused by the more expressed repulsion effect generated between adsorbed I À ions [3,4], as previously observed for aqueous and non-aqueous I À anions containing solutions with the constant ionic strength (Fig.…”

“…It is well known that the chemical nature of Bi(1 1 1) or pyrolytic (0 0 0 1) graphite and the crystallographic structure of an electrode surface significantly affect the specific adsorption of halide ions. However, due to its layered structure, saturated covalent bonding within layers and rhombohedral symmetry, the Bi(1 1 1) surface has a number of similarities and differences compared with the hexagonal carbon (0 0 0 1) surface [33][34][35].…”

Copper-Tin Alloys for the Electrocatalytic Reduction of CO2 in an Imidazolium-Based Non-Aqueous Electrolyte

“…The addition of 100 mM [BMIM] + to the N 2 -saturated MeCN containing 0.1 M TBAPF6 ( Figure 5, left) causes an increase of charge stored within the double layer region [29,30], which may be presumed to be due to the adsorption of [BMIM] + at the electrode/electrolyte interface of the negatively polarized CuSn film [31][32][33]. Similar phenomena have been observed for Au electrodes [34][35][36][37], and it has been demonstrated that [Im] + cations prefer to π-stack and lie flat on electrode surfaces, thereby supporting more capacitive charge build-up than an inner layer containing large TBA + cations [38][39][40].…”

The metal–ionic liquid interface as characterized by impedance spectroscopy andin situscanning tunneling microscopy

“…(ii) Lust and co-workers measured Bi(111) electrodes in various ionic liquids. [60][61][62][63][64][65] They concluded that the high and low frequency interfacial capacitances are different -that is, using the terms associated with the model of Fig. 2 inset, there is a non-zero C 1 capacitance.…”