Cyclic voltammetry of metal bipyridyl cations at redox active Ni–Al–Cl layered double hydroxide films

Effect of the presence of on the electrochromic responses of films of a redox active Ni–Al-layered double hydroxide

“…1-3, is in accord with what was expected based on our recent report on the CV of the ½CoðbpyÞ 3 2þ at electrodes modified with Ni-Al-LDH films [35]. As shown in Fig.…”

“…The second occurred around 0.0 V, the potential at which electrochemical reduction of ½CoðbpyÞ 3 3þ began. The current potential curve obtained in presence of the cobalt cation was similar to what we previously reported [35]. In particular, a very large cathodic peak was observed for the ½CoðbpyÞ 3 3þ=2þ couple.…”

“…The voltammogram was observed to evolve with the number of scans. In the initial scan, one large broad oxidation peak at 1.34 V, and a large reduction peak at 0.70 V were observed, along with a second large reduction peak at À0.22 V, attributed to reduction of the cobalt cation [35]. By the 20th scan however, the oxidation wave had split into two distinct oxidation peaks at 1.03 and 1.30 V, and both the nickel and cobalt reduction peaks were smaller and had shifted to higher potentials 0.76 and À0.05 V, respectively.…”

“…However, this colour change is not easily reversed because complete reduction of nickel in LDH films back to Ni(II) is difficult [6,9]. Recently, we reported very large cathodic peak currents for ½CoðbpyÞ 3 2þ cations at electrodes modified with Ni-Al-LDH films when the switching potential used was high enough to oxidize the LDH Ni(II) sites [35]. This was attributed to mediation of the reduction of Ni(III) in the films by the ½CoðbpyÞ 3 2þ cations.…”

Synthesis of Layered Hydroxide Zinc m‐Aminobenzoate Compounds and Their Exfoliation Reactions

“…The interlayer anions in the layered hosts can be exchanged by other inorganic, organic, or metallo-organic anions, and even by biomolecules containing ionizable acidic groups. 5 The intercalation and the intercalated nanocomposites have potential applications in the fields of photophysics and photochemistry, 6 electrochemistry (as sensors or biosensors), 7 precursors of nanostructured oxides, 8 biomolecule carriers, 9 and drug storage and release. 10 Recently much attention has been payed on the LDHs exfoliation, and LDHs with the interlayer anions of dodecyl sulfate, 11 glycine, 12 amino acids, 13 lactate, 14 benzoate, 2,4-dichlorobenzoate-, hydroxybenzoate, 15 and nitrate 16 have been successfully exfoliated.…”