High performance transition metal carbide and nitride and boride based asymmetric supercapacitors

摘要

In accordance with an embodiment of the disclosure, an asymmetric supercapacitor includes a first active material with a high hydrogen over-potential and a second active material with a high oxygen over-potential. The first active material is based on a nitride, an oxynitride, a carbide, an oxycarbide, a boride, or an oxyboride of a metal selected from Groups III, IV, V, VI, and VII of the Periodic Table.

主权项

1. An asymmetric supercapacitor comprising:
a first electrode comprising a first active material and having a first operating window, wherein the first active material comprises a material selected from the group consisting of a metal oxynitride, a metal oxycarbide, a metal oxyboride, and combinations thereof, and the metal is selected from the group consisting of Groups III, IV, V, VI, or VII of the Periodic Table; a second electrode comprising a second active material and having a second operating window, wherein the first and second operating windows overlap by 0%, based on voltage; a separator disposed between the first and second electrodes; and an aqueous electrolyte.