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Title: Cylindrical C96 Fullertubes: A Highly Active Metal-Free O2-Reduction Electrocatalyst

Journal Article · · Angewandte Chemie (International Edition)

A new isolation protocol was recently reported for highly purified metallic Fullertubes D5h-C90, D3d-C96, and D5d-C100, which exhibit unique electronic features. Here, we report the oxygen reduction electrocatalytic behavior of C60, C70 (spheroidal fullerenes), and C90, C96, and C100 (tubular fullerenes) using a combination of experimental and theoretical approaches. C96 (a metal-free catalyst) displayed remarkable oxygen reduction reaction (ORR) activity, with an onset potential of 0.85 V and a halfway potential of 0.75 V, which are close to the state-of-the-art Pt/C benchmark catalyst values. Here we achieved an excellent power density of 0.75 W cm−2 using C96 as a modified cathode in a proton-exchange membrane fuel cell, comparable to other recently reported efficient metal-free catalysts. Combined band structure (experimentally calculated) and free-energy (DFT) investigations show that both favorable energy-level alignment active catalytic sites on the carbon cage are responsible for the superior activity of C96.

Research Organization:
University of Texas at El Paso, TX (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF); Robert A. Welch Foundation; Nanotechnology Collaborative Infrastructure (NCI); Arab-German Young Academy of Sciences and Humanities (AGYA)
Grant/Contract Number:
FE0031908
OSTI ID:
1976278
Alternate ID(s):
OSTI ID: 1856284
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 21 Vol. 61; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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