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Articles by Eric J. Piechota
Cations control CO 2 electroreduction
Now, writing in Nature Catalysis, Hyeyoung Shin, Se-Ho Kim, Chang Hyuck Choi and colleagues show, using quasi in situ cryogenic atom probe tomography, that Na+ gets incorporated into OD-Cu under applied electrochemical potentials. This results in higher partial current densities for CO (JCO) relative to a Cu catalyst without an oxide layer. This work provides a tomographic picture that rationalizes better performance and succinctly ties together several underlying mechanisms.
Classifying oxidative reactivity in semiconductor photocatalysts
If excited-state hole absorption energies are used as the sole proxy for oxidative ability, then it may be assumed that visible-light-sensitized semiconductors, which display low-energy, hole-centred transitions, would be poor oxidants. Now, writing in the Journal of the American Chemical Society, Akira Yamakata, Junie Jhon M. Vequizo, and Kazunari Domen demonstrate that such an assumption is not necessarily true.
Differences in Photophysical Properties and Photochemistry of Ru(II)-Terpyridine Complexes of CH3CN and Pyridine
A series of 22 Ru(II) complexes of the type [Ru(tpy)(L)(L’)]n+, where tpy is the tridentate ligand 2,2’;6,2″-terpyridine, L represents bidentate ligands with varying electron-donating ability, and L’ is acetonitrile (1a–11a) or pyridine (1b–11b), were investigated. The dissociation of acetonitrile occurs from the 3MLCT state in 1a–11a, such that it does not require the population of a 3LF state.
Photocytotoxicity and photoinduced phosphine ligand exchange in a Ru(II) polypyridyl complex
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Deconvoluting double layers - Nature Chemistry
ELECTROCHEMISTRY Nature Chemistry (2021)Cite this article 77 Accesses 4 Altmetric Metrics details Subjects Nevertheless, these fields are critical in electrochemistry and energy conversion schemes, as well as to the function of biological membranes and enzyme active sites. Despite their importance in electrochemistry, a major complication is disentangling the apparent (applied) electric field from the one experienced by molecules at the double layer.
Improved Visible Light Absorption of Potent Iridium(III) Photo-oxidants for Excited-State Electron Transfer Chemistry
Three iridium photosensitizers, [Ir(dCF3ppy)2(N–N)]+, where N–N is 1,4,5,8-tetraazaphenanthrene (TAP), pyrazino[2,3-a]phenazine (pzph), or benzo[a]pyrazino[2,3-h]phenazine (bpph) and dCF3ppy is 2-(3,5-bis(trifluoromethyl-phenyl)pyridine), were found to be remarkably strong photo-oxidants with enhanced light absorption in the visible region.
Electron Transfer Reorganization Energies in the Electrode-Electrolyte Double Layer
The total reorganization energy, λ, for interfacial electron transfer, ET, from a conductive electrode to redox-active molecules at fixed positions within the electric double layer, EDL, has been determined experimentally. Conductive indium–tin-oxide (ITO, In2O3:Sn) mesoporous films were functionalized with 4-[N,N-di(p-tolyl)-amino]benzylphosphonic acid (TPA) and/or [RuII(bpy)2(4,4′-(PO3H2)2-bpy)]2+ (RuP), where bpy is 2,2′-bipyridine.
Oxidatively Stable Ferrocenyl-π-bridge-Titanocene D-π-A Complexes: An Electrochemical and Spectroscopic Investigation of the Mixed-Valence States
The synthesis, spectroscopic, and electrochemical characterization of oxidatively stable D-π-A compounds of the form (Me2CpC2Fc)2TiCl2 and RCp2Ti(C2Fc)¬2CuX (where Fc = ferrocenyl) are reported. Oxidative stability enabled by the addition of CuX is evidenced by voltammagrams of the RCp2Ti(C2Fc)2CuX compounds which all display two chemically-reversible 1e- FeIII/II couples, indicative of electronic communication between the Fc- termini.
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