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

Fan, Xiujun and Liu, Yuanyue and Peng, Zhiwei and Zhang, Zhenhua and Zhou, Haiqing and Zhang, Xianming and Yakobson, Boris I. and Goddard, William A., III and Guo, Xia and Hauge, Robert H. and Tour, James M. (2017) Atomic H-Induced Mo_2C Hybrid as an Active and Stable Bifunctional Electrocatalyst. ACS Nano, 11 (1). pp. 384-394. ISSN 1936-0851. doi:10.1021/acsnano.6b06089.

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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.

Item Type:Article
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URLURL TypeDescription Information
Fan, Xiujun0000-0003-4849-4305
Liu, Yuanyue0000-0002-5880-8649
Goddard, William A., III0000-0003-0097-5716
Tour, James M.0000-0002-8479-9328
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.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
National Natural Science Foundation of China21603129
Air Force Office of Scientific Research (AFOSR)FA9550-09-1-0581
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0035
Resnick Sustainability InstituteUNSPECIFIED
Department of Energy (DOE)DE-AC02-05CH11231
Subject Keywords:Mo2C, graphene nanoribbon, hydrogen-evolution reaction, oxygen-reduction reaction, atomic H
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Record Number:CaltechAUTHORS:20161219-100643546
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Official Citation:Atomic H-Induced Mo2C Hybrid as an Active and Stable Bifunctional Electrocatalyst Xiujun Fan, Yuanyue Liu, Zhiwei Peng, Zhenhua Zhang, Haiqing Zhou, Xianming Zhang, Boris I. Yakobson, William A. Goddard III, Xia Guo, Robert H. Hauge, and James M. Tour ACS Nano 2017 11 (1), 384-394 DOI: 10.1021/acsnano.6b06089
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72935
Deposited By: Tony Diaz
Deposited On:19 Dec 2016 19:45
Last Modified:11 Nov 2021 05:08

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