Electrodeposition of high aspect ratio single crystalline tellurium nanowires from piperidinium-based ionic liquid

Synthesis of Te-Bi core-shell nanowires by two-step electrodeposition in ionic liquids

“…The nanowires are self-standing single crystals with a growth axis along the [001] direction. As shown previously [17], the density of the nanowires increases with [Te IV ]. Nanowires synthesized for [Te IV ] = 5 mM (Figure 1a) have a mean length of 1.70 ± 0.15 µm and most of them have a diameter between 50 and 100 nm with an average of 83 ± 37 nm.…”

“…Indeed, only one reduction peak is observed in these halide-rich media. As in the case of Te [17], In [20] and Ta [21] electrochemical systems, the low amount of halides in the TFSI-based ionic liquid leads to complex cathodic behaviour. As previously suggested in the literature [17,20], this could be due to the reduction of successive BiBrx 3-x complexes to Bi 0 during the potential scan.…”

“…As in the case of Te [17], In [20] and Ta [21] electrochemical systems, the low amount of halides in the TFSI-based ionic liquid leads to complex cathodic behaviour. As previously suggested in the literature [17,20], this could be due to the reduction of successive BiBrx 3-x complexes to Bi 0 during the potential scan. The low mass transport rate during the formation of the Bi 0 deposit, due to the high viscosity of the ionic liquid (η = 15 mPa.s at 100°C [19]), could favour an increase in the concentration of halide ions in the vicinity of the electrode and thus modify the [Br -]/[Bi 3+ ] concentration ratios at the electrode/electrolyte interface.…”

A Rechargeable Al–Te Battery

“…However, the potential of the reduction peak is very close to the potential of the Te/Te 2– couple at 0.54 V (vs Al 3+ /Al, calculated by HSC 6.0 software as shown in Table S1) and ∼0.52 V (vs Al 3+ /Al, shown in acid aqueous solutions) . In addition, the electroreduction of the tellurium to Te 2– is widespread in room temperature ionic liquids, which will lead to the stripping of the deposited tellurium. − These results all indicate that the second stage is likely attributed to the redox of Te/Te 2– couple, and the Te 2– ion may exist as soluble species AlTeCl because the Al 2 X 3 (X = chalcogen) can be dissolved in Lewis acidic chloroaluminate melts according to eq . − …”

Potential Application of Ionic Liquids for Electrodeposition of the Material Targets for Production of Diagnostic Radioisotopes

“…Thiebaud et al [ 120 ] investigated the influence of 1-ethyl-1-octyl-piperidinium bromide ([EOPip]Br) content as additive to 1-ethyl-1-octyl-piperidinium bis(trifluoromethylsulfonyl)imide ([EOPip][Tf 2 N]) on the growth of Te nanowires. The experiments were carried out at 100 °C and Q = 2C∙cm −2 of Pt electrode.…”