# US 2018/0323462 A1 · Proton Conducting Electrolyte Composition and Method of Preparation thereof

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- Number: US 2018/0323462 A1
- Document ID: US20180323462A1
- Status: Published application
- Kind: A1
- Application number: 15/672,220
- Filed: 2017-08-08
- Published: 2018-11-08
- Earliest claimed: 2016-08-08
- Assignees: Universiti Brunei Darussalam
- Applicants: Universiti Brunei Darussalam
- Inventors: Abul Kalam AZAD; Mohamad Iskandar PETRA; Nikdalila RADENAHMAD
- Web page: https://patentgrep.com/patent/US20180323462A1

## CPC

- H01M 8/126: the electrolyte containing cerium oxide
- C01G 25/006: {Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements}
- H01M 8/1253: the electrolyte containing zirconium oxide
- C01P 2002/52: containing elements as dopants
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/76: by a space-group or by other symmetry indications
- C01P 2002/77: by unit-cell parameters, atom positions or structure diagrams
- C01P 2002/88: by thermal analysis data, e.g. TGA, DTA, DSC
- C01P 2004/03: obtained by SEM
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/53: bimodal size distribution
- C01P 2006/40: Electric properties
- H01M 2300/0071: Oxides
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to an electrolyte composition and method of making thereof. The proton conducting electrolyte composition i.e. Sr1-xBaxCe0.5Zr0.35Y0.1Sm0.05O3-δ, comprises combination of doped BaCeO3 and BaZrO3 by their doping in Sr, Y, and Sm, wherein x=0 to 0.99, and δ=0 to 0.1. The proton conducting electrolyte is used as at least one component, among others, of Solid Oxide Fuel Cells such Solid Oxide Fuel Cell (SOFC) can easily be operated at intermediate temperature about 600° C. thereby making the SOFC cost effective and reliable and showing highest power density.

## Claims

### Claim 1

An electrolyte composition comprising: Sr1-xBaxCe0.5Zr0.35Y0.1Sm0.05O3-δ which further comprising combination of doped BaCeO3 and BaZrO3 by their doping in Sr, Y, and Sm, wherein x=0 to 0.99, and δ=0 to 0.1.

### Claim 2 (depends on 1)

The electrolyte composition of claim 1, wherein value of x can be any one selected from the group consisting of 0, 0.1, 0.3, 0.5, 0.7, 0.9.

### Claim 3 (depends on 1)

The electrolyte composition of claim 1, wherein δ is the oxygen deficiency which is calculated based on the chemical formula of the composition.

### Claim 4 (depends on 1)

The electrolyte composition of claim 1, wherein BaCeO3 is triple doped in Zr, Y, Sm at the B-site.

### Claim 5

A process for preparing an electrolyte composition comprising:
contacting stoichiometric amount of SrO, BaCO3, CeO2, ZrO2, Y2O3, and Sm2O3 powders to mix them together in presence of alcohol, acetone, or water;
grinding the mix using agate mortar and pestle; and
sintering the mixed powders to obtain the electrolyte composition which shows highest power density at temperature about 600° C.

### Claim 6 (depends on 5)

The process of claim 5 further comprises triple doping of BaCeO3 and BaZrO3 in Sr, Y, and Sm.

### Claim 7 (depends on 5)

The process of claim 5, wherein reaction taking place during the contacting, grinding and sintering of the powders is a solid state reaction.

### Claim 8 (depends on 5)

The process of claim 5, wherein a hydraulic press is used to make 13 mm diameter pallets by pressing at pressure about 4 psi and temperature at about 1400° C.

### Claim 9 (depends on 5)

The process of claim 5, wherein the sintering takes place at temperature about 900° C. to 1450° C. for up to about 8 hours, wherein heating and cooling rate is about 5° C./min.

### Claim 10 (depends on 5)

The process of claim 5, wherein the grain size of the composition can be controlled by variable amount of Sr and Ba.

### Claim 11 (depends on 5)

The process of claim 5, wherein the percentage composition of Ce, Zr, Y, and Sm being kept fixed.

### Claim 12

A Solid Oxide Fuel Cell (SOFC) of which at least one component, among others, is made of the electrolyte composition as claimed in claims from 1 to 11, wherein the electrolyte is a proton conducting electrolyte and the SOFC can easily be operated at intermediate temperature about 600° C. thereby making the SOFC cost effective and reliable.

### Claim 13 (depends on 12)

The Solid Oxide Fuel Cell (SOFC) of claim 12 shows highest highest peak power density about 697 mW/cm2 at temperature about 600° C.