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Title: Critical role of intercalated water for electrocatalytically active nitrogen-doped graphitic systems

Journal Article · · Science Advances
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [4];  [6];  [6];  [7];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Physics and Applications Division
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Physics and Applications Division; Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  4. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Chemistry Division
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division. Center for Nanophase Materials Sciences
  7. Rutgers Univ., Piscataway, NJ (United States). Science and Engineering

Graphitic materials are very essential in energy conversion and storage because of their excellent chemical and electrical properties. The strategy for obtaining functional graphitic materials involves graphite oxidation and subsequent dissolution in aqueous media, forming graphene-oxide nanosheets (GNs). Restacked GNs contain substantial intercalated water that can react with heteroatom dopants or the graphene lattice during reduction. We demonstrate that removal of intercalated water using simple solvent treatments causes significant structural reorganization, substantially affecting the oxygen reduction reaction (ORR) activity and stability of nitrogen-doped graphitic systems. Amid contrasting reports describing the ORR activity of GN-based catalysts in alkaline electrolytes, we demonstrate superior activity in an acidic electrolyte with an onset potential of ~0.9 V, a half-wave potential (E½) of 0.71 V, and a selectivity for four-electron reduction of >95%. Finally and further, durability testing showed E½ retention >95% in N2- and O2-saturated solutions after 2000 cycles, demonstrating the highest ORR activity and stability reported to date for GN-based electrocatalysts in acidic media.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; AC52-06NA25396; AC04-94AL85000
OSTI ID:
1261296
Journal Information:
Science Advances, Vol. 2, Issue 3; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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Cited By (6)

Active Sites and Mechanism of Oxygen Reduction Reaction Electrocatalysis on Nitrogen-Doped Carbon Materials journal October 2018
The critical role of hydroxyl groups in water vapor sensing of graphene oxide journal January 2019
Selective Aerobic Oxidation of Alcohols over Atomically-Dispersed Non-Precious Metal Catalysts journal December 2016
Progress in the Development of Fe‐Based PGM‐Free Electrocatalysts for the Oxygen Reduction Reaction journal December 2018
Nanocarbon for Oxygen Reduction Electrocatalysis: Dopants, Edges, and Defects journal January 2017
In Silico Design and Characterization of Graphene Oxide Membranes with Variable Water Content and Flake Oxygen Content journal February 2019