Issue 29, 2020, Issue in Progress

Bench-scale demonstration of CO2 capture with an electrochemically driven proton concentration process

Abstract

A thorough experimental investigation of a bench-scale apparatus of the proton concentration process with two symmetrical MnO2 electrodes is presented, with the aim of continuous desorption of CO2 from a K2CO3 solution. The electrodes were fabricated through cathodic deposition, and their chemical states, morphology, and microstructural architecture were characterized with X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Successful formation of MnO2 film was confirmed by XPS analysis, and the SEM images showed a uniform distribution of the film across the carbon substrate surface and along the strand, with an average thickness of ∼500 nm, thus making proton ion diffusion possible. Continuous and efficient desorption of CO2 from a K2CO3 solution was obtained when electrodeposited MnO2 electrodes were used in a flow-based proton concentration process. The amount of CO2 desorbed per area of the electrode was 12-fold higher than that of a similar system. The electrochemical nature of the proton concentration process offers substantial practical advantages for the future, especially if electricity can be sustainably produced from renewable sources.

Graphical abstract: Bench-scale demonstration of CO2 capture with an electrochemically driven proton concentration process

Article information

Article type
Paper
Submitted
16 Mar 2020
Accepted
21 Apr 2020
First published
29 Apr 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 16832-16843

Bench-scale demonstration of CO2 capture with an electrochemically driven proton concentration process

M. Rahimi, G. Catalini, M. Puccini and T. A. Hatton, RSC Adv., 2020, 10, 16832 DOI: 10.1039/D0RA02450C

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