Peer-Reviewed Publications

2024

42. Dual-Phase Reaction Sintering for Overcoming the Inherent Sintering Ability of Refractory Electrolytes in Protonic Ceramic Cells

Junseok Kim, Jiwon Yun, Wanjae Lee, Do-Hyeong Kim, Puspendu Guha, Jin-Ha Hwang, Deok-Hwang Kwon, Sungeun Yang, Jong-Ho Lee, Kyung Joong Yoon, Ji-Won Son, Sahn Nahm, Sihyuk Choi* and Ho-Il Ji*

Advanced Energy Materials (2024) In press

41. Electrochemical Evaluation of Mixed Ionic and Electronic Conductor-Proton Conducting Oxide Composite Cathode for Protonic Ceramic Fuel Cells

Hyeongsik Shin, Jinwoo Lee, and Sihyuk Choi*

Journal of Hydrogen and New Energy 35, 48-55 (2024)

40. Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

Inhyeok Cho, Jiwon Yun, Boseok Seong, Junseok Kim, Sun Hee Choi, Ho-il Ji and Sihyuk Choi*

Journal of Energy Chemistry 88, 1-9 (2024)

2022

39. Performance Comparison of Composite Cathode: Mixed Ionic and Electronic Conductor and Triple Ionic and Electronic Conductor with BaZr0.1Ce0.7Y0.1Yb0.1O3-δ for Highly Efficient Protonic Ceramic Fuel Cells

Arim Seong, Donghwi Jeong, Minseo Kim, Sihyuk Choi*, and Guntae Kim*

Journal of Power Sources 530, 231241 (2022)

38. Utilization of an Isovalent Doping Strategy in Cobalt-Free Ferrites for Highly Active and Stable Solid Oxide Fuel Cell Cathodes

Hyunmin Kim‡, Chaesung Lim‡, Ohhun Kwon, Sihyuk Choi*, Jeong Woo Han*, and Guntae Kim*

ACS Applied Energy Materials 5(3), 3417-3425 (2022)

37. Progress and outlook for symmetrical solid oxide electrolysis cells

Yunfeng Tian, Nalluri Abhishek, Caichen Yang, Rui Yang, Sihyuk Choi, Bo Chi*, Jian Pu, Yihan Ling*, John T.S. Irvine, and Guntae Kim*

Matter 5, 482-514 (2022)

2021

36. Electrochemical Evaluation of Layered Perovskite YBa0.5Sr0.5Co1.5Fe0.5O5+d Cathode as a Triple Ionic and Electronic Conductor for Protonic Ceramic Fuel Cells

Inhyeok Cho and Sihyuk Choi*

Ceramist 24(4), 386-398 (2021)

35. First-Principles Insight into the Effects of Intrinsic Oxygen Defects on Proton Conducting in Ruddlesden-Popper Oxides

Lili Li, Jing Zhou, Zhiwei Hu, Sihyuk Choi, Guntae Kim, Jian-Qiang Wang*, and Linjuan Zhang*

The Journal of Physical Chemistry Letters 12, 11503-11510 (2021)

34. Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

Hyunmin Kim‡, Chaesung Lim‡, Ohhun Kwon‡, Jinkyung Oh, Matthew T. Curnan, Hu Young Jeong, Sihyuk Choi*, Jeong Woo Han*, and Guntae Kim*

Nature Communications 12:6814 (2021)

33. Electrokinetic proton transport in triple (H+/O2-/e-) conducting oxides as a key descriptor for highly efficient protonic ceramic fuel cells

Arim Seong‡, Junyoung Kim‡, Donghwi Jeong, Sivaprakash Sengodan, Meilin Liu, Sihyuk Choi*, and Guntae Kim*

Advanced Science 8, 2004099 (2021) "Inside Back Cover"

32. The First Observation of Ni Nanoparticle Exsolution from YSZ and its Application for Dry Reforming of Methane

Sangwook Joo‡, Chaehyun Lim‡, Ohhun Kwon, Linjuan Zhang, Jing Zhou, Zian-Qiang Wang, Hu Young Jeong, Yong-wook Sin, Sihyuk Choi*, and Guntae Kim*

Materials Report:Energy, 1, 100021 (2021)

31. Local Multimodal Electro-Chemical-Structural Characterization of Solid-Electrolyte Grain Boundaries

Xin Xu,* Connor Carr, Xinqi Chen, Benjamin D. Myers, Ruiyun Huang, Weizi Yuan, Sihyuk Choi, Dezhi Yi, Charudatta Phatak, and Sossina M. Haile*

Advanced Energy Materials 2003309 (2021)

2020

30. Cobalt-free Pr0.5Ba0.4Sr0.1FeO3-d as a highly efficient cathode for commercial YSZ-supported solid oxide fuel cell

Hyunmin Kim‡, Sangwook Joo‡, Ohhun Kwon, Sihyuk Choi*, Guntae Kim*

ChemElectroChem 7, 4378-4382 (2020)

29. Ca and Ni doped Pr0.5Ba0.5FeO3-d as a highly active and robust cathode for high-temperature solid oxide fuel cell

Chaehyun Lim, Yejin Yang, Yong-wook Sin*, Sihyuk Choi*, and Guntae Kim*

Energy & Fuels 34, 11458-11463 (2020)

28. Review on exsolution and its driving forces in perovskites

Ohhun Kwon‡, Sangwook Joo‡, Sihyuk Choi*, Sivaprakash Sengodan*, and Guntae Kim*

Journal of Physics: Energy 2, 032001 (2020)

27. Electrochemical properties of Sr‑doped layered perovskite as a promising anode material for direct hydrocarbon SOFCs

Sihyuk Choi*

Journal of Korean Ceramic Society 57, 409-415 (2020)

2019

26. A Nano-Structured SOFC Composite Cathode Prepared via Infiltration of La0.5Ba0.25Sr0.25Co0.8Fe0.2O3-δ into La0.9Sr0.1Ga0.8Mg0.2O3-δ for Extended Triple-Phase Boundary Area

Seungtae Lee, Seona Kim, Sihyuk Choi*, Jeeyoung Shin*, and Guntae Kim*

Journal of the Electrochemical Society  166(12), F805-F809 (2019)

25. Protonic ceramic electrochemical cells for hydrogen production and electricity generation: exceptional reversibility, stability and demonstrated faradaic efficiency

Sihyuk Choi, Timothy C Davenport, and Sossina M Haile*

Energy & Environmental Science 12, 206-215 (2019)  "2018 Energy and Environmental Science HOT Article"

~ 2018 (Before KIT)

24. Exceptional power density and stability at intermediate temperatures in protonic ceramic fuel cells

Sihyuk Choi, Chris J Kucharczyk, Yangang Liang, Xiaohang Zhang, Ichiro Takeuchi, Ho-Il Ji, and Sossina M Haile*

Nature Energy 3, 202-210 (2018) 

23. Polypyrrole-assisted oxygen electrocatalysis on perovskite oxide

Dong-Gyu Lee, Su Hwan Kim, Se Hun Joo, Ho-Il Ji, Hadi Tavassol, Yuju Jeon, Sihyuk Choi, Myeong-Hee Lee, Chanseok Kim, Sang Kyu Kwak, Guntae Kim, and Hyun-Kon Song* 

Energy & Environmental Science 10, 523-527 (2017)

22. A robust symmetrical electrode with layered perovskite structure for direct hydrocarbon solid oxide fuel cells: PrBa0.8Ca0.2Mn2O5+δ 

Sihyuk Choi, Sivaprakash Sengodan, Seonhye Park, Yong-Wan Ju, Joonyoung Kim, Junji Hyodo, Hu Young Jeong, Tatsumi Ishihara, Jeeyoung Shin*, and Guntae Kim*

Journal of Materials Chemistry A 4, 1747-1753 (2016)

21. Catalytic Dynamics and Oxygen Diffusion in Doped PrBaCo2O5.5+δ Thin Films

Erik Enriquez, Xing Xu, Shanyong Bao, Zach Harrell, Chonglin Chen*, Sihyuk Choi, Areum Jun, Guntae Kim, Myung-Hwan Whangbo 

ACS Applied Materials & Interfaces 7, 24353-24359 (2015)  

20. Correlation between fast oxygen kinetics and enhanced performance in Fe doped layered perovskite cathode for solid oxide fuel cells

Areum Jun, Seonyoung Yoo, Young-Wan Ju, Junji Hyodo, Sihyuk Choi, Hu Young Jeong, Jeeyoung Shin, Tatsumi Ishihara, Tak-hyoung Lim*, and Guntae Kim*

Journal of Materials Chemistry A 3, 15082-15090 (2015) 

19. Measurement of Emf in Liquid Sodium Using a Gadolinia-Doped Ceria Solid Electrolyte

Sang Hun Shin, Jeong Hyeon Lee, Jung Ki Lee, Jun Lim, Sihyuk Choi, Guntae Kim, and Ji Hyun Kim*

Journal of the Electrochemical Society 162(7), B152-B158 (2015) 

18. The effect of calcium doping on improvement of performance and durability in a layered perovskite cathode for intermediate-temperature solid oxide fuel cell

Sihyuk Choi, Seonhye Park, Jeeyoung Shin*, and Guntae Kim*

Journal of Materials Chemistry A 3, 6088-6095 (2015) 

17. Layered oxygen-deficient double perovskite as efficient and stable anode for direct hydrocarbon solid oxide fuel cells 

Sivaprakash Sengodan‡, Sihyuk Choi‡, Areum Jun, Tae Ho Shin, Young-Wan Ju, Hu Young Jeong, Jeeyoung Shin, John TS Irvine*, and Guntae Kim* 

Nature Materials 14, 205-209 (2015)     

16. Scale-Down and Sr-Doping Effects on La4Ni3O10-d - YSZ Nanocomposite Cathodes for IT-SOFCs

Seona Kim, Sihyuk Choi, Areum Jun, Jeeyoung Shin*, and Guntae Kim* 

Journal of the Electrochemical Society 161, F1468-F1473 (2014)

15. Highly Efficient Layer-by-Layer-Assisted Infiltration for High-Performance and Cost-Effective Fabrication of Nanoelectrodes 

Yuri Choi‡, Sihyuk Choi‡, Hu Young Jeong, Meilin Liu, Byeong-Su Kim*, and Guntae Kim*

ACS Applied Materials & Interfaces 6, 17352-17357 (2014)  

14. Electrochemical Properties of La4Ni3O10-GDC Composite Cathode by Facile Sol-gel Method for IT-SOFCs

Sihyuk Choi and Guntae Kim* 

Journal of Korean Ceramic Society 51, 265-270 (2014)

13. Chemically Stable Perovskite as a Cathode Materials for Solid Oxide Fuel Cells: La doped Ba0.5Sr0.5Co0.8Fe0.2O3-d

Junyoung Kim, Sihyuk Choi, Areum Jun, Hu Young Jeong, Jeeyoung Shin, and Guntae Kim*

ChemSusChem 7, 1669-1675 (2014)  

12. Tradeoff optimization of electrochemical performance and thermal expansion for Co-based cathode material for intermediate-temperature solid oxide fuel cells

Seonhye Park, Sihyuk Choi, Jeeyoung Shin*, and Guntae Kim*

Electrochimica Acta 125, 683-690 (2014) 

11. A collaborative study of sintering and composite effects for a PrBa0.5Sr0.5Co1.5Fe0.5O5+d IT-SOFC cathode

Seonhye Park, Sihyuk Choi, Jeeyoung Shin, Guntae Kim*

RSC Advances 4, 1775–1781 (2014) 

10. Effect of Mn on the electrochemical properties of a layered perovskite NdBa0.5Sr0.5Co2-xMnxO5+d (x = 0, 0.25, and 0.5) for intermediate-temperature solid oxide fuel cells

Jiyoun Kim, Sihyuk Choi, Seonhye Park, Changmin Kim, Jeeyoung Shin, Guntae Kim*

Electrochimica Acta 112, 712-718 (2013) 

9. Electrochemical properties of an ordered perovskite LaBaCo2O5+d-Ce0.9Gd0.1O2-d composite cathode with strontium doping for intermediate-temperature solid oxide fuel cells 

S. Choi, S. Park, J. Kim, T.-H. Lim, J. Shin and G. Kim* 

Electrochemistry Communications 34, 5-8 (2013) 

8. Highly efficient and robust cathode materials for low-temperature solid oxide fuel cells: PrBa0.5Sr0.5Co2-xFexO5+d

Sihyuk Choi, Seonyoung Yoo, Jiyoun Kim, Seonhye Park, Areum Jun, Sivaprakash Sengodan, Junyoung Kim, Jeeyoung Shin, Hu Young Jeong, YongMan Choi, Guntae Kim*, and Meilin Liu*

Scientific Reports 3, 2426 (2013) 

7. Investigation of layered perovskite type NdBa1-xSrxCo2O5+d (x = 0, 0.25, 0.5, 0.75, and 1.0) cathodes for intermediate-temperature solid oxide fuel cells

Seonyoung Yoo, Sihyuk Choi, Junyoung Kim, Jeeyoung Shin, and Guntae Kim*

Electrochimica Acta 100, 44-50 (2013) 

6. Chemical compatibility, redox behavior, and electrochemical performance of Nd1-xSrxCoO3-d cathodes based on Ce1.9Gd0.1O1.95 for intermediate-temperature solid oxide fuel cells

Sihyuk Choi, Jeeyoung Shin, Kang Min Ok, and Guntae Kim*

Electrochimica Acta 81, 217-223 (2012)

5. Strontium Doping Effect on High-Performance PrBa1-xSrxCo2O5+d as a Cathode Material for IT-SOFCs

Seonhye Park, Sihyuk Choi, Junyoung Kim, Jeeyoung Shin, and Guntae Kim*

ECS Electrochemistry Letters 1, F29-F32 (2012) 

4. Electrochemical investigation of strontium doping effect on high performance Pr1-xSrxCoO3-d (x = 0.1, 0.3, 0.5, and 0.7) cathode for intermediate-temperature solid oxide fuel cells

Seonhye Park, Sihyuk Choi, Jeeyoung Shin, and Guntae Kim*

Journal of Power Sources 210, 172-177 (2012) 

3. Electrical properties, thermodynamic behavior, and defect analysis of Lan+1NinO3n+1+δ infiltrated into YSZ scaffolds as cathodes for intermediate-temperature SOFCs

Seonyoung Yoo, Sihyuk Choi, Jeeyoung Shin, Meilin Liu, and Guntae Kim*

RSC Advances 2, 4648-4655 (2012) 

2. The electrochemical and thermodynamic characterization of PrBaCo2-xFexO5+d (x = 0, 0.5, 1) infiltrated into yttria-stabilized zircornia scaffold as cathodes for solid oxide fuel cells

Sihyuk Choi, Jeeyoung Shin, Guntae Kim*

Journal of Power Sources 201, 10-17 (2012) 

1. High Performance SOFC Cathode Prepared by Infiltration of Lan+1NinO3n+1 (n = 1, 2, and 3) in Porous YSZ

Sihyuk Choi, Seonyoung Yoo, Jee-Young Shin, Guntae Kim*

Journal of the Electrochemical Society 158 (8), B995-B999 (2011)