Atomic H-Induced Mo_2C Hybrid as an Active and Stable Bifunctional Electrocatalyst
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
- Eprint ID
- 72935
- DOI
- 10.1021/acsnano.6b06089
- Resolver ID
- CaltechAUTHORS:20161219-100643546
- 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
- Created
-
2016-12-19Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field
- Caltech groups
- Resnick Sustainability Institute
- Other Numbering System Name
- WAG
- Other Numbering System Identifier
- 1247