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Mo2C@3D ultrathin macroporous carbon realizing efficient and stable nitrogen fixation

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  • ReceivedFeb 27, 2020
  • AcceptedApr 7, 2020
  • PublishedApr 27, 2020

Abstract

Ammonia is a key feedstock of fertilizers for farming and convenient hydrogen carrier as an emerging clean fuel, but industrial ammonium production process, Haber-Bosch reaction, is an energy-intensive process, consuming 1%–2% of global energy and producing 3% global CO2. Electrochemical nitrogen reduction reaction (NRR) is one of the most promising routes to realize highly efficient NH3 production under ambient conditions. However, up to now, few precious-metal-free electrocatalysts with desirable catalytic performance have been explored. In this work, Mo2C nanodots anchored on three-dimensional ultrathin macroporous carbon (Mo2C@3DUM-C) framework is developed toward significantly enhanced nitrogen reduction reaction. Thanks to the special structural design of 3D ultrathin macroporous carbon and highly active and stable Mo2C toward N2 electrochemical reduction, the Mo2C@3DUM-C framework exhibits a high Faradaic efficiency of 9.5% for NH3 production at −0.20 V and the yield rate reaches 30.4 µg h−1 mgMo2C−1. Further electrochemical characterizations reveal the enhanced electron transfer and increased electrochemical surface area in the 3D macroporous carbon framework. Moreover, the Mo2C@3DUM-C electrocatalysts hold high catalytic stability after long-term NRR test. The temperature-dependent yield rate of NH3 demonstrates that the activation energy of nitrogen reduction on the employed catalyst was calculated to be 28.1 kJ mol−1. Our proposed earth-abundant Mo2C@3DUM-C demonstrates an alternative insight into developing efficient and stable nitrogen fixation catalysts in acids as alternatives to noble metal catalysts.


Acknowledgment

G. Yu acknowledges the funding support from US Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0019019, and Camille Dreyfus Teacher-Scholar Award.


Interest statement

The authors declare that they have no conflict of interest.


Supplement

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    (a) Schematic illustration of Mo2C@3D ultrathin macroporous carbon for N2 fixation in acidic media; (b) SEM image of Mo2C@3DUM-C; (c) TEM and (d) HRTEM image of Mo2C@3DUM-C: the lattice fringes of 0.237, 0.261, and 0.228 nm, corresponding to the 200, 002, and 102 facets of the orthogonal Mo2C (inset of (d): electron diffraction of Mo2C@3DUM-C) (color online).

  • Figure 2

    (a) XRD, (b) TGA of Mo2C@3DUM-C and Mo2C@2D-C; (c) Raman spectrum of Mo2C@3DUM-C; (d) EDS and elemental mapping of Mo2C@3DUM-C (color online).

  • Figure 3

    (a) LSV curves of Mo2C@3DUM-C in N2-saurated and Ar saturated 0.1 M HCl electrolyte (inset: LSV curves from −0.1 to −0.3 V); (b) chronoamperometry test of Mo2C@3DUM-C in N2-saurated 0.1 M HCl electrolyte at different applied potentials; (c) yield rate of NH3 production and Faradic efficiency at different applied potentials; (d) UV-Vis absorption spectra of electrolyte under different testing conditions; (e) yield rate of NH3 production of Mo2C@3DUM-C in N2-saurated and Ar saturated 0.1 M HCl and Mo2C@2D-C in N2-saurated 0.1 M HCl; (f) charging current density differences plotted against scan rates of Mo2C@3DUM-C and Mo2C@2D-C (color online).

  • Figure 4

    (a) Chronoamperometry test of Mo2C@3DUM-C in N2-saurated 0.1 M HCl electrolyte; (b) cycling stability of Mo2C@3DUM-C in N2-saurated saturated 0.1 M HCl electrolyte after 2-h and 4-h NRR test; (c) yield rate of NH3 production of Mo2C@3DUM-C in continuous eight cycles; (d) XRD, (e) Raman and (f) TEM image of Mo2C@3DUM-C after 2-h-NRR test in N2-saurated 0.1 M HCl electrolyte (color online).

  • Figure 5

    (a) Chronoamperometry test, (b) yield rate of NH3 production and Faradic efficiency of Mo2C@3DUM-C in N2-saurated 0.1 M HCl electrolyte at −0.25 V under different temperatures; (c) calculated activation energy of Mo2C@3DUM-C catalyst for NRR (color online).

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