Method for regulating phase transformation of hydrogen-containing transition metal oxide

Patent metadata

Field	Value
Publication number	US-2019280201-A1
Application number	US-201916420159-A
Country	US
Kind code	A1
Filing date	May 22, 2019
Priority date	Nov 23, 2016
Publication date	Sep 12, 2019
Grant date	—

Abstract

A method for regulating a phase transformation of a hydrogen-containing transition metal oxide comprises steps of: providing a hydrogen-containing transition metal oxide having a structural formula of ABOxHy, wherein the hydrogen-containing transition metal oxide is in form of a first phase, A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value in a range of 0 to 2.5; soaking the hydrogen-containing transition metal oxide with a first ionic liquid capable of providing hydrogen ions and oxygen ions; and applying a gating voltage to the hydrogen-containing transition metal oxide with the first ionic liquid as a gate to regulate the phase transformation of the hydrogen-containing transition metal oxide.

First claim

What is claimed is:

1 . A method for regulating a phase transformation of a hydrogen-containing transition metal oxide, comprising steps of:
providing a hydrogen-containing transition metal oxide having a structural formula of ABO x H y , wherein the hydrogen-containing transition metal oxide is in form of a first phase, A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value in a range of 0 to 2.5; soaking the hydrogen-containing transition metal oxide with a first ionic liquid capable of providing hydrogen ions and oxygen ions; and applying a gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as a gate to regulate the phase transformation of the hydrogen-containing transition metal oxide.

2 . The method of claim 1 , wherein a method for making the hydrogen-containing transition metal oxide comprises:
providing a transition metal oxide having a structural formula of ABO z , wherein z is greater than or equal to 2 and smaller than or equal to 3; soaking the transition metal oxide with a second ionic liquid, wherein the second ionic liquid is capable of providing hydrogen ions and oxygen ions by ionizing water; and applying an electric field to the transition metal oxide to cause the hydrogen ions in the second ionic liquid to insert into the transition metal oxide.

3 . The method of claim 2 , wherein the providing the transition metal oxide comprises:
providing a substrate; depositing a film of the transition metal oxide having the structural formula of ABO z onto a surface of the substrate; and forming a first electrode on a surface of the film of the transition metal oxide.

4 . The method of claim 3 , wherein the substrate is one of a ceramic substrate, a silicon substrate, a glass substrate, a metal substrate, or a polymer.

5 . The method of claim 3 , wherein, the film of the transition metal oxide is obtained via an epitaxial growth on the substrate by using a pulsed laser deposition method.

6 . The method of claim 3 , wherein, the first electrode contacts the film of the transition metal oxide to form a bottom electrode.

7 . The method of claim 2 , wherein the applying the electric field to the transition metal oxide comprises:
providing a second electrode and a power source; disposing the second electrode to be spaced from the first electrode and connecting the second electrode and the first electrode electrically and respectively to the power source; and soaking the second electrode with the second ionic liquid, and applying an electric field in a direction from the second electrode to the first electrode by the power source.

8 . The method of claim 1 , wherein the applying the gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as the gate comprises:
applying a negative gating voltage to the hydrogen-containing transition metal oxide ABO x H y to extract the hydrogen ions from or insert the oxygen ions into the hydrogen-containing transition metal oxide so as to cause the hydrogen-containing transition metal oxide to be in form of a second phase, wherein the second phase has a lattice volume smaller than that of the first phase.

9 . The method of claim 8 , wherein the applying the gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as the gate comprises:
applying a positive gating voltage to the hydrogen-containing transition metal oxide in the form of the second phase to insert the hydrogen ions into or extract the oxygen ions from the hydrogen-containing transition metal oxide in the form of the second phase so as to cause the hydrogen-containing transition metal oxide in the form of the second phase to revert back to the first phase.

10 . The method of claim 8 , wherein the applying the gating voltage to the hydrogen-containing transition metal oxide through the first ionic liquid as the gate comprises:
applying a negative gating voltage to the hydrogen-containing transition metal oxide in the form of the second phase to insert the oxygen ions into or extract the hydrogen ions from the hydrogen-containing transition metal oxide in the form of the second phase so as to be in form a third phase, wherein the third phase has a lattice volume smaller than that of the second phase.

11 . The method of claim 1 , wherein the ABO x H y is SrCoO 2.5 H.

Assignees

• Univ Tsinghua

Inventors

• Yu Pu
• Lu nian-peng
• Wu Jian
• Zhou shu-yun

Classifications

• H10P32/185

  Lithium-drift diffusion · CPC title

• H10P14/46

  using a liquid · CPC title

• G02F1/1524

  Transition metal compounds · CPC title

• G02F1/155

  Electrodes · CPC title

• G02F1/1525

  characterised by a particular ion transporting layer, e.g. electrolyte · CPC title