CaltechAUTHORS
Published January 24, 2017 | Version Accepted Version + Supplemental Material
Journal Article Open

Atomic H-Induced Mo_2C Hybrid as an Active and Stable Bifunctional Electrocatalyst

Creators

  • 1. ROR icon Shanxi University
  • 2. ROR icon Beijing University of Technology
  • 3. ROR icon Rice University

Abstract

Mo_2C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanocatalysts (Mo_2C-GNR) are synthesized through the direct carbonization of metallic Mo with atomic H treatment. The growth mechanism of Mo2C NCs with atomic H treatment is discussed. The Mo_2C-GNR hybrid exhibits highly active and durable electrocatalytic performance for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). For HER, in an acidic solution the Mo_2C-GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec^(-1), in a basic solution Mo_2C-GNR has an onset potential of 53 mV, and Tafel slope of 54 mV dec^(-1). It is stable in both acidic and basic media. Mo2C-GNR is a high activity ORR catalyst with a high peak current density of 2.01 mA cm^(-2), an onset potential of 0.94 V that is more positive vs reversible hydrogen electrode, a high electron transfer number n (∼3.86) and long-term stability.

Additional Information

© 2016 American Chemical Society. Received: September 8, 2016; Accepted: December 18, 2016; Published: December 18, 2016. The authors acknowledge Y. Yang, H. Fei, R. Ye, G. Ruan, Q. Zhong, C. Gao, L. Li, N. D. Kim and J. Lin at Rice University for helpful discussions, and the National Natural Science Foundation of China (21603129), the Air Force Office of Scientific Research (FA9550-09-1-0581), and the AFOSR MURI program (FA9550-12-1-0035) for partial support of this research. The authors would also like to acknowledge Dr. Junjie Zhang from Scientific Instrument Center at Shanxi University for her help with ICP-MS measurement. Y. L. acknowledges the support from Resnick Prize Postdoctoral Fellowship at Caltech. The computations were performed on National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and Extreme Science and Engineering Discovery Environment, which is supported by National Science Foundation grant number ACI-1053575. The authors declare no competing financial interest.

Attached Files

Accepted Version - acsnano_2E6b06089.pdf

Supplemental Material - nn6b06089_si_001.pdf

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Additional details

Identifiers

Eprint ID
72935
DOI
10.1021/acsnano.6b06089
Resolver ID
CaltechAUTHORS:20161219-100643546

Related works

Describes
10.1021/acsnano.6b06089 (DOI)

Funding

National Natural Science Foundation of China
21603129
Air Force Office of Scientific Research (AFOSR)
FA9550-09-1-0581
Air Force Office of Scientific Research (AFOSR)
FA9550-12-1-0035
Resnick Sustainability Institute
Department of Energy (DOE)
DE-AC02-05CH11231
NSF
ACI-1053575

Dates

Created
2016-12-19
Created from EPrint's datestamp field
Updated
2021-11-11
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Resnick Sustainability Institute
Other Numbering System Name
WAG
Other Numbering System Identifier
1247