Interface-reinforcing sintering step for highly stable operation of proton-conducting fuel cell stack

Sungmin Kim; Hyungjun Lee; Chanho Kim; Inyoung Jang; Kangchun Lee; Seho Sun; Dongsoo Lee; Jeongheon Kim; Keemin Park; Ganggyu Lee; Hojin Jeong; Heesung Yoon; Ungyu Paik; Taeseup Song

doi:10.1016/j.jpowsour.2022.232082

Interface-reinforcing sintering step for highly stable operation of proton-conducting fuel cell stack

Sungmin Kim
, Hyungjun Lee
, Chanho Kim
, Inyoung Jang
, Kangchun Lee
, Seho Sun
, Dongsoo Lee
, Jeongheon Kim
, Keemin Park
, Ganggyu Lee
, Hojin Jeong
, Heesung Yoon
, Ungyu Paik
, Taeseup Song

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Proton conducting fuel cells (PCFCs) are promising power generation systems due to their low operating temperature by conducting proton activated with low kinetic energy. However, well-known proton conducting materials such as Y-doped BaCeO_3−δ (BCY), Y-doped BaZrO_3−δ (BZY), and BaCe_0.8-xZr_xY_0.1Yb_0.1O_3−δ (BCZYYb) have a limitation in that the planar cell is fragile during operation attributed to the low mechanical strength. This study proposes a two-step sintering method to fabricate mechanically superior PCFC large cells based on the BCZYYb electrolyte. The two-step sintering process consists of a heat treatment step at a temperature in which the anode and electrolyte have similar shrinkage values during the sintering process and another step that can improve the bonding strength of each layer by grain growth. The vulnerable anode/electrolyte interface, which acts as a significant mechanical failure factor, is optimized through the two-step sintering process. Two-step sintered cells show high mechanical stability in lab-scale and 6 cm × 6 cm planar cells for stack systems. A two-step sintered large cell exhibits outstanding stability during 350 h at 600 °C with the stack system. Our strategy provides a method to build practical proton-conducting fuel cells.

Original language	English
Article number	232082
Journal	Journal of Power Sources
Volume	548
DOIs	https://doi.org/10.1016/j.jpowsour.2022.232082
State	Published - Nov 15 2022
Externally published	Yes

Funding

This work was supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ), which was granted financial resources from the Ministry of Trade, Industry, & Energy, Republic of Korea ( 20214000000520 ). Also, this material is based upon work supported by the Ministry of Trade, Industry & Energy ( MOTIE , Korea) under Industrial Technology Innovation Program. No. 20003877 , ‘Development of eco-friendly electrochemical recycling system for production of high purity (>99.5%) lithium and lithium compounds.' This work was supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), which was granted financial resources from the Ministry of Trade, Industry, & Energy, Republic of Korea (20214000000520). Also, this material is based upon work supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program. No. 20003877, ‘Development of eco-friendly electrochemical recycling system for production of high purity (>99.5%) lithium and lithium compounds.'

Keywords

PCFC
Protonic conducting solid oxide fuel cell
Shrinkage behavior
Stack
Two-step sintering

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10.1016/j.jpowsour.2022.232082

Cite this

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title = "Interface-reinforcing sintering step for highly stable operation of proton-conducting fuel cell stack",

abstract = "Proton conducting fuel cells (PCFCs) are promising power generation systems due to their low operating temperature by conducting proton activated with low kinetic energy. However, well-known proton conducting materials such as Y-doped BaCeO3−δ (BCY), Y-doped BaZrO3−δ (BZY), and BaCe0.8-xZrxY0.1Yb0.1O3−δ (BCZYYb) have a limitation in that the planar cell is fragile during operation attributed to the low mechanical strength. This study proposes a two-step sintering method to fabricate mechanically superior PCFC large cells based on the BCZYYb electrolyte. The two-step sintering process consists of a heat treatment step at a temperature in which the anode and electrolyte have similar shrinkage values during the sintering process and another step that can improve the bonding strength of each layer by grain growth. The vulnerable anode/electrolyte interface, which acts as a significant mechanical failure factor, is optimized through the two-step sintering process. Two-step sintered cells show high mechanical stability in lab-scale and 6 cm × 6 cm planar cells for stack systems. A two-step sintered large cell exhibits outstanding stability during 350 h at 600 °C with the stack system. Our strategy provides a method to build practical proton-conducting fuel cells.",

keywords = "PCFC, Protonic conducting solid oxide fuel cell, Shrinkage behavior, Stack, Two-step sintering",

author = "Sungmin Kim and Hyungjun Lee and Chanho Kim and Inyoung Jang and Kangchun Lee and Seho Sun and Dongsoo Lee and Jeongheon Kim and Keemin Park and Ganggyu Lee and Hojin Jeong and Heesung Yoon and Ungyu Paik and Taeseup Song",

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year = "2022",

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doi = "10.1016/j.jpowsour.2022.232082",

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T1 - Interface-reinforcing sintering step for highly stable operation of proton-conducting fuel cell stack

AU - Kim, Sungmin

AU - Lee, Hyungjun

AU - Kim, Chanho

AU - Jang, Inyoung

AU - Lee, Kangchun

AU - Sun, Seho

AU - Lee, Dongsoo

AU - Kim, Jeongheon

AU - Park, Keemin

AU - Lee, Ganggyu

AU - Jeong, Hojin

AU - Yoon, Heesung

AU - Paik, Ungyu

AU - Song, Taeseup

PY - 2022/11/15

Y1 - 2022/11/15

N2 - Proton conducting fuel cells (PCFCs) are promising power generation systems due to their low operating temperature by conducting proton activated with low kinetic energy. However, well-known proton conducting materials such as Y-doped BaCeO3−δ (BCY), Y-doped BaZrO3−δ (BZY), and BaCe0.8-xZrxY0.1Yb0.1O3−δ (BCZYYb) have a limitation in that the planar cell is fragile during operation attributed to the low mechanical strength. This study proposes a two-step sintering method to fabricate mechanically superior PCFC large cells based on the BCZYYb electrolyte. The two-step sintering process consists of a heat treatment step at a temperature in which the anode and electrolyte have similar shrinkage values during the sintering process and another step that can improve the bonding strength of each layer by grain growth. The vulnerable anode/electrolyte interface, which acts as a significant mechanical failure factor, is optimized through the two-step sintering process. Two-step sintered cells show high mechanical stability in lab-scale and 6 cm × 6 cm planar cells for stack systems. A two-step sintered large cell exhibits outstanding stability during 350 h at 600 °C with the stack system. Our strategy provides a method to build practical proton-conducting fuel cells.

AB - Proton conducting fuel cells (PCFCs) are promising power generation systems due to their low operating temperature by conducting proton activated with low kinetic energy. However, well-known proton conducting materials such as Y-doped BaCeO3−δ (BCY), Y-doped BaZrO3−δ (BZY), and BaCe0.8-xZrxY0.1Yb0.1O3−δ (BCZYYb) have a limitation in that the planar cell is fragile during operation attributed to the low mechanical strength. This study proposes a two-step sintering method to fabricate mechanically superior PCFC large cells based on the BCZYYb electrolyte. The two-step sintering process consists of a heat treatment step at a temperature in which the anode and electrolyte have similar shrinkage values during the sintering process and another step that can improve the bonding strength of each layer by grain growth. The vulnerable anode/electrolyte interface, which acts as a significant mechanical failure factor, is optimized through the two-step sintering process. Two-step sintered cells show high mechanical stability in lab-scale and 6 cm × 6 cm planar cells for stack systems. A two-step sintered large cell exhibits outstanding stability during 350 h at 600 °C with the stack system. Our strategy provides a method to build practical proton-conducting fuel cells.

KW - PCFC

KW - Protonic conducting solid oxide fuel cell

KW - Shrinkage behavior

KW - Stack

KW - Two-step sintering

UR - https://www.scopus.com/pages/publications/85138149566

U2 - 10.1016/j.jpowsour.2022.232082

DO - 10.1016/j.jpowsour.2022.232082

M3 - Article

AN - SCOPUS:85138149566

SN - 0378-7753

VL - 548

JO - Journal of Power Sources

JF - Journal of Power Sources

M1 - 232082

ER -

Interface-reinforcing sintering step for highly stable operation of proton-conducting fuel cell stack

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