Atomic H-Induced Mo2C Hybrid as an Active and Stable Bifunctional Electrocatalyst
| Autor: | James M. Tour, Haiqing Zhou, Yuanyue Liu, Robert H. Hauge, William A. Goddard, Xia Guo, Xiujun Fan, Zhenhua Zhang, Boris I. Yakobson, Zhiwei Peng, Xian-Ming Zhang |
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| Rok vydání: | 2017 |
| Předmět: |
Tafel equation
Inorganic chemistry General Engineering General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Electron transfer chemistry Basic solution Reversible hydrogen electrode General Materials Science 0210 nano-technology Bifunctional Graphene nanoribbons |
| Zdroj: | ACS Nano. 11:384-394 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Mo2C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanoelectrocatalysts (Mo2C–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 Mo2C–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 Mo2C–GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec–1, and in a basic solution Mo2C–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 0.93 V that is more positive vs reversible hydrogen electrode (RHE), a high electron transfer number n (∼3.90), and long-term stability. |
| Databáze: | OpenAIRE |
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