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Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide

[Image: see text] Engineered solid–liquid interfaces will play an important role in the development of future energy storage and conversion (ESC) devices. In the present study, defective graphene oxide (GO) and reduced graphene oxide (rGO) structures were used as engineered interfaces to tune the se...

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Autores principales: Genorio, Bostjan, Harrison, Katharine L., Connell, Justin G., Dražić, Goran, Zavadil, Kevin R., Markovic, Nenad M., Strmcnik, Dusan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6753649/
https://www.ncbi.nlm.nih.gov/pubmed/31430112
http://dx.doi.org/10.1021/acsami.9b13391
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author Genorio, Bostjan
Harrison, Katharine L.
Connell, Justin G.
Dražić, Goran
Zavadil, Kevin R.
Markovic, Nenad M.
Strmcnik, Dusan
author_facet Genorio, Bostjan
Harrison, Katharine L.
Connell, Justin G.
Dražić, Goran
Zavadil, Kevin R.
Markovic, Nenad M.
Strmcnik, Dusan
author_sort Genorio, Bostjan
collection PubMed
description [Image: see text] Engineered solid–liquid interfaces will play an important role in the development of future energy storage and conversion (ESC) devices. In the present study, defective graphene oxide (GO) and reduced graphene oxide (rGO) structures were used as engineered interfaces to tune the selectivity and activity of Pt disk electrodes. GO was deposited on Pt electrodes via the Langmuir–Blodgett technique, which provided compact and uniform GO films, and these films were subsequently converted to rGO by thermal reduction. Electrochemical measurements revealed that both GO and rGO interfaces on Pt electrodes exhibit selectivity toward the oxygen reduction reaction (ORR), but they do not have an impact on the activity of the hydrogen oxidation reaction in acidic environments. Scanning transmission electron microscopy at atomic resolution, along with Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), revealed possible diffusion sites for H(2) and O(2) gas molecules and functional groups relevant to the selectivity and activity of these surfaces. Based on these insights, rGO interfaces are further demonstrated to exhibit enhanced activity for the ORR in nonaqueous environments and demonstrate the power of our ex situ engineering approach for the development of next-generation ESC devices.
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spelling pubmed-67536492019-09-24 Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide Genorio, Bostjan Harrison, Katharine L. Connell, Justin G. Dražić, Goran Zavadil, Kevin R. Markovic, Nenad M. Strmcnik, Dusan ACS Appl Mater Interfaces [Image: see text] Engineered solid–liquid interfaces will play an important role in the development of future energy storage and conversion (ESC) devices. In the present study, defective graphene oxide (GO) and reduced graphene oxide (rGO) structures were used as engineered interfaces to tune the selectivity and activity of Pt disk electrodes. GO was deposited on Pt electrodes via the Langmuir–Blodgett technique, which provided compact and uniform GO films, and these films were subsequently converted to rGO by thermal reduction. Electrochemical measurements revealed that both GO and rGO interfaces on Pt electrodes exhibit selectivity toward the oxygen reduction reaction (ORR), but they do not have an impact on the activity of the hydrogen oxidation reaction in acidic environments. Scanning transmission electron microscopy at atomic resolution, along with Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), revealed possible diffusion sites for H(2) and O(2) gas molecules and functional groups relevant to the selectivity and activity of these surfaces. Based on these insights, rGO interfaces are further demonstrated to exhibit enhanced activity for the ORR in nonaqueous environments and demonstrate the power of our ex situ engineering approach for the development of next-generation ESC devices. American Chemical Society 2019-08-20 2019-09-18 /pmc/articles/PMC6753649/ /pubmed/31430112 http://dx.doi.org/10.1021/acsami.9b13391 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Genorio, Bostjan
Harrison, Katharine L.
Connell, Justin G.
Dražić, Goran
Zavadil, Kevin R.
Markovic, Nenad M.
Strmcnik, Dusan
Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title_full Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title_fullStr Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title_full_unstemmed Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title_short Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide
title_sort tuning the selectivity and activity of electrochemical interfaces with defective graphene oxide and reduced graphene oxide
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6753649/
https://www.ncbi.nlm.nih.gov/pubmed/31430112
http://dx.doi.org/10.1021/acsami.9b13391
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