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Title: A theoretical study of the effect of a non-aqueous proton donor on electrochemical ammonia synthesis

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c7cp05484j· OSTI ID:1423520
 [1];  [2];  [3];  [3];  [4];  [4];  [5]
  1. University of Science and Technology Beijing (China). Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE); SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis; Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering; Univ. of Southern California, Los Angeles, CA (United States). Mork Family Department of Chemical Engineering and Materials Science
  3. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering
  4. University of Science and Technology Beijing (China). Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis; Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis, Department of Chemical Engineering

We report that ammonia synthesis is one of the most studied reactions in heterogeneous catalysis. To date, however, electrochemical N2 reduction in aqueous systems has proven to be extremely difficult, mainly due to the competing hydrogen evolution reaction (HER). Recently, it has been shown that transition metal complexes based on molybdenum can reduce N2 to ammonia at room temperature and ambient pressure in a non-aqueous system, with a relatively small amount of hydrogen output. We demonstrate that the non-aqueous proton donor they have chosen, 2,6-lutidinium (LutH+), is a viable substitute for hydronium in the electrochemical process at a solid surface, since this donor can suppress the HER rate. Finally, we also show that the presence of LutH+ can selectively stabilize the *NNH intermediate relative to *NH or *NH2via the formation of hydrogen bonds, indicating that the use of non-aqueous solvents can break the scaling relationship between limiting potential and binding energies.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; 9455; DGE-1656518
OSTI ID:
1423520
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 20, Issue 7; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 76 works
Citation information provided by
Web of Science

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Cited By (11)

Single molybdenum center supported on N-doped black phosphorus as an efficient electrocatalyst for nitrogen fixation journal January 2019
Electrochemical nitrogen reduction to ammonia at ambient conditions on nitrogen and phosphorus co-doped porous carbon journal January 2019
Doping single transition metal atom into PtTe sheet for catalyzing nitrogen reduction and hydrogen evolution reactions journal October 2019
Biomimetic Nitrogen Fixation Catalyzed by Transition Metal Sulfide Surfaces in an Electrolytic Cell journal August 2019
A Review of Electrocatalytic Reduction of Dinitrogen to Ammonia under Ambient Conditions journal May 2018
Computational Screening of Efficient Single‐Atom Catalysts Based on Graphitic Carbon Nitride (g‐C 3 N 4 ) for Nitrogen Electroreduction journal October 2018
Atomic Modulation, Structural Design, and Systematic Optimization for Efficient Electrochemical Nitrogen Reduction journal January 2020
Ambient dinitrogen electrocatalytic reduction for ammonia synthesis journal January 2019
The identification of optimal active boron sites for N 2 reduction journal January 2020
Electrochemical synthesis of ammonia as a potential alternative to the Haber–Bosch process journal May 2019
High-yield production of few-layer boron nanosheets for efficient electrocatalytic N 2 reduction journal January 2019

Figures / Tables (8)


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