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

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [2];  [3];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Ljubljana, Ljubljana (Slovenia). Faculty of Chemistry and Chemical Technology
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Nanoscale Sciences Dept.
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. National Inst. of Chemistry, Ljubljana (Slovenia)

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 H2 and O2 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Slovenian Research Agency (ARRS); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; AC04-94AL85000
OSTI ID:
1569847
Alternate ID(s):
OSTI ID: 1570266
Report Number(s):
SAND-2019-10400J; 153933
Journal Information:
ACS Applied Materials and Interfaces, Vol. 11, Issue 37; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Figures / Tables (5)