Year: 2016
Type: article
Abstract: Mo 2 C nanocrystals (NCs) anchored on vertically aligned graphene nanoribbons (VA-GNR) as hybrid nanoelectrocatalysts (Mo 2 C–GNR) are synthesized through the direct carbonization of metallic Mo with atomic H treatment. The growth mechanism of Mo 2 C NCs with atomic H treatment is discussed. The Mo 2 C–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 2 C–GNR has an onset potential of 39 mV and a Tafel slope of 65 mV dec –1, and in a basic solution Mo 2 C–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. Mo 2 C–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.
Source: ACS Nano
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, California Institute of Technology, Resnick Sustainability Institute for Science, Energy and Sustainability, California Institute of Technology, Rice University, National Natural Science Foundation of China, Shanxi University, China Scholarship Council, Office of Science, Multidisciplinary University Research Initiative, Scientific Instrument Center, SXU, Air Force Office of Scientific Research
Awards: G1286236842, G1395708746, G1523888516, G1554045874, G1863003419, G3083819904, G3310577945, G419881185, G42916606, G4501827968, G4877884257, G498139845, G6071252945, G6531230466, G6651824660, XSEDE: eXtreme Science and Engineering Discovery Environment, G704498496, G7289327952, G7830320759, G810380549, G8209385336, G969889393
OpenAlex ID: W2564996136