Perovskite materials and methods of making and use thereof

Patent metadata

Field	Value
Publication number	US-2021275821-A1
Application number	US-202117192022-A
Country	US
Kind code	A1
Filing date	Mar 4, 2021
Priority date	Mar 4, 2020
Publication date	Sep 9, 2021
Grant date	—

Abstract

Disclosed herein are perovskite materials and methods of making an use thereof.

First claim

What is claimed is:

1 . A perovskite material comprising:
[A 1-x Sn x ][B 1-x B′ y ]O 3
where: A, if present, is selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, La, Ag, Cd, Tl, Pb, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or a combination thereof; B and B′, if present, are independently selected from the group consisting of Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, La, Hf, Ta, W, Re, Os, Ir, Pt, Au, Bi, or a combination thereof; x is from greater than 0 to 1; and y is from 0 to 1; with the proviso that A and B are different, A and B′ are different, and B and B′ are different.

2 . The perovskite material of claim 1 , wherein the perovskite material comprises [Ba 1-x Sn x ][Zr 1-y Ti y ]O 3 .

3 . The perovskite material of claim 1 , wherein the perovskite material comprises [Ba 1-x Sn x ][Zr 1-y Ti y ]O 3 , where x is from 0.1 to 1 and y is 0, 0.25, 0.5, 0.75, or 1.

4 . The perovskite material of claim 1 , wherein the perovskite material comprises Ba 0.8 Sn 0.2 Zr 0.25 Ti 0.75 O 3 , Ba 0.8 Sn 0.2 Zr 0.5 Ti 0.5 O 3 , Ba 0.6 Sn 0.4 Zr 0.5 Ti 0.5 O 3 , Ba 0.4 Sn 0.6 Zr 0.5 Ti 0.5 O 3 , Ba 0.8 Sn 0.2 Zr 0.75 Ti 0.25 O 3 , Ba08Sn02Zr 03, Ba 0.6 Sn 0.4 ZrO 3 , Ba 0.9 Sn 0.1 TiO 3 , or a combination thereof.

5 . The perovskite material of claim 1 , wherein the perovskite material comprises [Pb 1-x Sn x ][Zr 1-y Ti y ]O 3 .

6 . The perovskite material of claim 1 , wherein the perovskite material is metastable.

7 . The perovskite material of claim 1 , wherein the perovskite material substantially excludes lead, such that the perovskite material comprises a lead-free perovskite material.

8 . The perovskite material of claim 1 , wherein the perovskite material is ferroelectric.

9 . The perovskite material of claim 1 , wherein the perovskite material comprises a semiconductor with a bandgap that overlaps with at least a portion of the solar spectrum.

10 . The perovskite material of claim 1 , wherein the perovskite material is biocompatible.

11 . A method of making the perovskite material of claim 1 , the method comprising a peritectic flux reaction between a preliminary perovskite material and a Sn(II)-halide salt.

12 . The method of claim 11 , wherein the method comprises contacting a preliminary perovskite comprising A[B 1-y B′ y ]O 3 with a Sn(II)-halide salt comprising SnCl 2 and/or SnF 2 .

13 . The method of claim 11 , wherein the preliminary perovskite comprises lead zirconate titanate (PZT).

14 . A method of converting a lead-containing perovskite to a lead-free perovskite by extracting the lead from the lead-containing perovskite using the method of claim 11 .

15 . A method of use of the perovskite material of claim 1 as a photocatalyst for photocatalytic fuel generation.

16 . The method of any one of claim 15 , wherein the method comprises using the perovskite material as a photocatalyst for solar water splitting; for photocatalytic hydrogen generation; or a combination thereof.

17 . The method of claim 15 , wherein the perovskite material comprises a photocatalyst that exhibits a photocatalytic rate of from 100 μmol O 2 h −1 g −1 to 5000 μmol O 2 h −1 g −1 under electromagnetic irradiation at one or more wavelengths from 230 nm to 1023 nm.

18 . A device comprising the perovskite material of claim 1 .

19 . The device of claim 18 , wherein the device comprises a biocompatible sensor.

20 . The device of claim 18 , wherein the device comprises a piezoelectric device, and the piezoelectric device comprises a power source in a pacemaker.

Assignees

• Univ North Carolina State

Inventors

• Maggard Jr Paul A
• O'Donnell Shaun
• Jones Jacob L

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/395

  Thickness of the active catalytic layer · CPC title

• B01J35/733

  Perovskite-type · CPC title