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New papers are accepted in Electrochemistry Communications and ChemElectroChem

01/05/2020 - several recent works are accepted in Electrochemistry Communications and ChemElectroChem

Identifying limits of Cu stability towards electrochemical CO2 reduction.

Article title: Electrochemical copper dissolution: A benchmark for stable CO2 reduction on copper

Authors: Florian D. Speck, Dr. Serhiy Cherevko

The prospect of carbon capture through electrochemical CO2 reduction, encourages academia and industry to develop Cu-based electrocatalysts. Due to its unique selectivity towards desired C2 products, Cu is the go-to material. While activity and selectivity are rigorously examined by academia, industrial application is not far from realization. However, the stability against dissolution of such Cu-based catalysts has not been addressed in detail.
In our recent work we use on-line ICP-MS to identify a stable window of operation for such systems. We find that Cu dissolution only occurs at potentials associated with its oxidation, i.e. higher than 0.5 VRHE. Therefore, these potentials need to be avoided in application when the device is switched off. If these potentials do occur despite all efforts, a pH of 9 would favor the passivation through Cu oxides and minimize dissolution.

The whole story can be openly accessed in Electrochemistry Communicationshttps://www.sciencedirect.com/science/article/pii/S1388248120300904?via%3Dihub


On the use of doped tin oxide supports for Ir oxygen evolution reaction electrocatalysts

Article title: Oxygen evolution reaction on tin oxides supported iridium catalysts: Do we need dopants?

Authors: Gabriel C. da Silva, Seiti I. Venturini, Siyuan Zhang, Mario Löffler, Christina Scheu, Karl J. J. Mayrhofer, Edson A. Ticianelli, and Serhiy Cherevko

Modern proton exchange membrane water electrolysers (PEMWEs) rely on rare and expensive Ir-based electrocatalysts to accelerate the sluggish oxygen evolution reaction (OER). There is a huge research effort to decrease Ir loading on some 1-2 orders of magnitude. This goal can be achieved by using supports, i.e. same approach as with carbon for Pt in PEM fuel cells. Doped tin oxides had emerged as promising candidates. In this study we compare OER activity of two Ir catalysts, viz. rutile IrO2 and hydrous IrOx, supported by Sb-, F-, and In- doped and undoped SnO2. It is found that, at least for the studied systems, conductivity of oxide supports does not play any significant role in the overall catalyst activity.

More details can be found online - https://doi.org/10.1002/celc.202000391.
Moreover, for those interested in our water electrolysis research activities, check corresponding information in the RESEARCH section.

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