Decoupling Conductivity, Heterogeneous Electron Transfer Rate, and Diffusion in Organic Molecular Electrocatalysis: Oxygen Reduction Reaction on Poly(3,4-ethylenedioxythiophene)
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| Title: | Decoupling Conductivity, Heterogeneous Electron Transfer Rate, and Diffusion in Organic Molecular Electrocatalysis: Oxygen Reduction Reaction on Poly(3,4-ethylenedioxythiophene) |
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| Authors: | Sepat, Neha, Vagin, Mikhail, Carli, Stefano, Marchini, Edoardo, Caramori, Stefano, Zhang, Qilun, Braun, Slawomir, Wu, Zhixing, Ding, Penghui, Wijeratne, Kosala, Petsagkourakis, Ioannis, Ail, Ujwala, Pavlopoulou, Eleni, Ruoko, Tero-Petri, Fabiano, Simone, Tybrandt, Klas, Fahlman, Mats, Crispin, Reverant, Berggren, Magnus, Gueskine, Viktor, Engquist, Isak |
| Source: | Small. 21(5) |
| Subject Terms: | Conducting polymers, Conductive plastics, Decay (organic), Doping (additives), Elastomers, Electrolysis, Electrolytic reduction, Ionomers, Oxygen reduction reaction, Petroleum tar, Photodissociation, Photoionization, Thermal diffusion in gases, Transparent conducting oxides, 4-ethylenedioxythiophene), Electronic conductivity, Ethylenedioxythiophenes, Heterogeneous electron transfer, Nafions, Poly(3, poly(styrenesulphonate), Poly(styrene sulfonate), Secondary doping, Surface area, Chemical industry |
| Description: | The electrified production of hydrogen peroxide (H2O2) by oxygen reduction reaction (ORR) is attractive to increase the sustainability of chemical industry. Here the same chains of intrinsically conductive polymer, poly(3,4-ethylenedioxythiophene) (PEDOT) are utilized, as ORR electrocatalyst, while varying polymeric primary dopants (PSS and Nafion) and the level of secondary doping with DMSO. These changes modulate various properties of the film, such as its microscale organization and electronic conductivity. The aim here is to clearly decouple the rate of the heterogeneous electron transfer (HET) of ORR from the diffusion affected by electronic conductivity and the electrochemically available surface area. It is found that the rate of HET and the double layer capacitance are significantly affected by primary dopant. On the contrary, secondary doping shows very little effect on the rate of HET. However, such secondary doping resulted in the increase of both electrochemically available surface area and the diffusion through the polymer film. This effect is attributed to a few orders increase of the electronic conductivity in the film improving availability of the polymer for electron transfer. The enhancement of diffusion upon the secondary doping of conducting polymer is utilized to improve direct conversion of air into H2O2 on gas diffusion electrode. |
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| Access URL: | https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-76463 https://doi.org/10.1002/smll.202409471 |
| Database: | SwePub |
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Nájsť tento článok vo Web of Science | Abstract: | The electrified production of hydrogen peroxide (H2O2) by oxygen reduction reaction (ORR) is attractive to increase the sustainability of chemical industry. Here the same chains of intrinsically conductive polymer, poly(3,4-ethylenedioxythiophene) (PEDOT) are utilized, as ORR electrocatalyst, while varying polymeric primary dopants (PSS and Nafion) and the level of secondary doping with DMSO. These changes modulate various properties of the film, such as its microscale organization and electronic conductivity. The aim here is to clearly decouple the rate of the heterogeneous electron transfer (HET) of ORR from the diffusion affected by electronic conductivity and the electrochemically available surface area. It is found that the rate of HET and the double layer capacitance are significantly affected by primary dopant. On the contrary, secondary doping shows very little effect on the rate of HET. However, such secondary doping resulted in the increase of both electrochemically available surface area and the diffusion through the polymer film. This effect is attributed to a few orders increase of the electronic conductivity in the film improving availability of the polymer for electron transfer. The enhancement of diffusion upon the secondary doping of conducting polymer is utilized to improve direct conversion of air into H2O2 on gas diffusion electrode. |
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| ISSN: | 16136810 16136829 |
| DOI: | 10.1002/smll.202409471 |