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US 12,012,662 B2Granted
Materials for ammonia synthesis
AssigneeOhio State Innovation Foundation
InventorsUmit Ozkan, Seval Gunduz, Dhruba Jyoti Deka
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Abstract
Disclosed herein are doped perovskite oxides. The doped perovskite oxides may be used as a cathode material in an electrochemical cell to electrochemically generate ammonia from N2. The doped perovskite oxides may be combined with nitride compounds, for instance iron nitride, to further increase the efficiency of the ammonia production.
Claims12
A method of generating ammonia, comprising:
- electrochemically reducing H2O and N2 with a composition comprising a perovskite oxide, to provide NH3 and O2-;
- and
- oxidizing the O21 to give oxygen gas,
- wherein the perovskite oxide has the formula:
- A1wA2xXyFezO3,
- wherein:
- A1 is selected from La, Tb, Gd, Sm, Pr, and Nd;
- A2 is selected from Sr, Mg, Ca, and Ba;
- X is one or more metals in the +1 or +2 oxidation state;
- w is from 0.5-1.0;
- x is from 0-0.5;
- y is from 0-0.5;
- and
- z is from 0.5 to less than 1.0;
- wherein w, x, y, and z are chosen to maintain electroneutrality, and
- wherein w, x, y, and z are chosen to maintain electroneutrality, and wherein the composition further comprises one or more nitride compounds having the formula MaNb, wherein M is selected from Fe, Mb, Co, Cr, and V, a is selected from 1, 2, 3, or and 4, and b is selected from 1, 2, 3, and 4.
13 more elements
Dependencies are inferred from the claim text.