In many engineering scenarios, surface-active organic species are added to acidic solutions to inhibit the corrosion of metallic components. Given suitable selection, such corrosion inhibitors are highly effective, preventing significant...

An optimized one‐pot recipe has been developed to synthesize a surfactant molecule, referred to as OMID, consisting of an imidazoline head group and aliphatic tail, which is an exemplar corrosion inhibitor for carbon steel in acidic solutions. As evidenced by gas chromatography, 1H and 13C nuclear magnetic resonance, and Fourier‐transform infrared data, a high‐purity product was achieved without the use of either a solvent or catalyst. Critical micelle concentration values and corrosion inhibition efficiencies ( η%) were determined in aqueous solutions of hydrochloric acid and sulfuric acid using surface tensiometry and linear polarization resistance measurements, respectively. Hydrolysis of the imidazoline head group as a function of pH (0–11) was explored with ultraviolet–visible absorption spectroscopy. In addition, N 1s and C 1s X‐ray photoelectron spectroscopy data were acquired from both surface‐adsorbed OMID and a multilayer of the imidazoline head group of OMID. These latter data are highly relevant to those attempting to understand OMID inhibition chemistry.

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Wendy Flavell opened a general discussion of the paper by Martina Dell'Angela: You have very nicely separated out two separate timescales for the dynamics in this system. In the context of the SPV, clearly this scales with uence, but (quite apart from the 'n/p' issue) naively I wondered if you expect to see an SPV shi at all in this systemit seems to be fairly two-dimensional to medoes it have a depletion layer at the surface that could give rise to an SPV shi?Martina Dell'Angela answered: We thank you for the question. MoTe 2 is indeed a 2D layered material, but we are measuring a bulk crystal in the 2H phase, which is a semiconductor. Interlayer interactions are weak in this class of material, but the out-of-plane conductivity is not entirely suppressed (around 10 3 times lower than the in-plane conductivity), thus allowing for the formation of a depletion region and for the rise of photovoltage effects, as observed in other transition metal dichalchogenides, e.g., MoS 2 (ref. 1 and 2) and WSe 2 . 3