228 presentation iit bombay new

Structural, morphological and thermo gravimetric analysis of spray pyrolysed Y doped BaCeO3 (BCY) thin films

Under the guidance

Prof. C. H. Bhosale & Dr. L. D. Jadhav

BySnehal U. Dubal

Department of Physics, Shivaji University, Kolhapur - 416 004, India

Outline of Presentation

1. INTRODUCTION

2. EXPERIMENTAL BCY – perovskite structure Synthesis of Yttrium doped Barium Cerate (BCY) thin films by

Spray pyrolysis technique

3. RESULTS AND DICUSSION Thermo gravimetric analysis XRD studies Morphological studies DC- Conductivity

• 4. CONCLUSIONS

Introduction of fuel cell and types of fuel Cell

Fuel cell type Mobile Ion Operating Temperature ◦C

Polymer electrolyte membrane fuel cell (PEMFC)

H+50-100

Alkaline fuel cell (AFC) OH- 50-200

Phosphoric acid fuel cell (PAFC) H+ ~220

Molten carbonate fuel cell (MCFC)

CO32- ~650

Solid oxide fuel cell (SOFC)

O2- OR H+ 500-1000

At Anode H2 → 2H+ + 2e−

At Cathode 1/2O2 +2e− 1/2 O2−

A fuel cell is an electrochemical energy conversion device.

Higher efficiency.

Low cost electrode materials can be used instead of

expensive noble metals such as platinum.

A large variety of fuels can be used including natural

gas, biogas, methanol and ammonia.

Low degradation problem of cell components.

Easy to handle as all the components are in solid

form.

Advantages of SOFC

Chemicals and materialsBCY –perovskite structure

Oxygen atom

Barium atom

Cerium atom

• The different perovskite based materials have

been explored as proton conducting

electrolyte materials for intermediate

temperature SOFCs .

• Three basic materials are BaZrO3, SrZrO3

and BaCeO3.

• BaCeO3 exhibits proton conductivity - 1.8 x

10-2 to 7 x 10-2 𝛀-1 cm-1

• To increase its conductivity and chemical

stability, it is doped with Yttrium at Ceria

sites. Yttrium atom

Three Dimensional View of Perovskite

O

Ba

Ce

A

O3

B

ABO3 - Structure

Proton conduction mechanism

OHVOH ig 2)(2

HOOVOH g 2)(2

Synthesis of Yttrium doped Barium Cerate (BCY) thin films by Spray pyrolysis technique

Solution Concn Substrate Substrate temp. Spray rate

0.1 M Alumina 250 °C 1 ml/min

Chemical-1 Ba (NO3)2

Chemical-2 Ce(NO3)3

Chemical-3 Y(NO3)3

Solvent Water

Schematic view of Spray pyrolysis techniques (SPT)

RESULTS AND DICUSSIONThermo gravimetric analysis

XRD patterns of BCY films annealed at different temperature

AnnealingTemp. °C

Crystallite Size nm

1000 26

900 35

800 11

700 10

a = 8.873Å b = 6.246 Å C = 6.216 Å

JCPDS cardNo. 82-2372

700 °C

800 °C

900 °C

1000 °C

SEM of BCY films

700 °C

1000 °C 900 °C

800 °C

DC-conductivity in (a) air (b) Argon atmosphere

CONCLUSIONS

BCY20 thin electrolyte has been deposited by economical spray pyrolysis technique.

The phase pure and dense film is obtained at 900 °C.

The maximum value of dc conductivity in argon at 600 °C is 2.45 × 10−3 S cm−1.

This method could be extended to form thin electrolyte based SOFC.

• I like to acknowledge the UGC for financial assistance under RGN- fellowship.

Acknowledgment

Thank you