Ho-il Ji

EDUCATION

California Institute of Technology (Caltech) (2012.10 - 2017.06)

Ph.D. program in Materials Science

(Advisor: Prof. Sossina M. Haile)

Research focus: Thermochemical cycle, Kinetics in Oxides

Seoul National University (2007.03 - 2009.02)

M.S. in Material Science and Engineering

(Advisor: Prof. Han-Ill Yoo)

Research focus: Point-defect structure analysis, Solid State Ionics

Seoul National University (2003.03 - 2007.02)

B.S. in Material Science and Engineering

RESEARCH & WORK EXPERIENCE

Principal Research Scientist (2022.03 – present),

Senior Research Scientist (2018.03 – 2022.02),

Research Scientist (2009.03 – 2018.02)

Korea Institute of Science and Technology (KIST)

- Center for Energy Materials Research

- Performed research on Solid State Ionics and Electrochemistry in Solid Oxide Fuel Cells and Protonic Ceramic Fuel Cells

Visiting Pre-doctoral Fellow, Northwestern University (2015.05 – 2017.06)

(Advisor: Prof. Sossina M. Haile)

- Thermochemical cycle, Kinetics in Oxides

Teaching Assistant, Northwestern University (2016.01 - 2016.03)

- Solid State Chemistry

Researcher, Seoul National University (2007.03 - 2009.02)

- Dissertation: High-temperature Defect Structure of PDP MgO

Teaching Assistant, Seoul National University (2007.03 - 2007.12)

- Thermodynamics

- Physical Chemistry of Ceramics

AWARDS AND SCHOLARSHIPS

Academic Contribution Award (Silver), The Korean Ceramic Society (2022.10)

Young Ceramist Award, The Korean Ceramic Society (2019.11)

KIST Person of the Month (2018.09)

Financial Support Program, Korea Institute of Science and Technology (2012.09 – 2014.08)

National Graduate S&T Scholarship, Korea Student Aid Foundation (2007.09 - 2008.07)

Scholarship for Teaching Support and Research, Seoul National University (2007.03 - 2007.07)

National Undergraduate S&T Scholarship, Korea Student Aid Foundation (2003.03 - 2006.12)

PUBLICATION (selected)

1. H. An, S. Im, J. Kim, B.K. Kim, J.W. Son, K.J. Yoon, H. Kim, S. Yang, H. Kang*, J.H. Lee*, H.I. Ji*, An Unprecedented Vapor-Phase Sintering Activator for Highly Refractory Proton-Conducting Oxides, ACS Energy Letters, 7 (2022) 4036

2. S. Im, M.A. Berk, S. Yang, B.K. Kim, K.J. Yoon, J.W. Son, J.H. Lee*, H.I. Ji*, The proton uptake process in double perovskite triple ionic-electronic conducting oxides for protonic ceramic cells, Journal of Materials Chemistry A, 10 (2022) 16127

3. J. Kim, S. Im, S.H. Oh, J.Y. Lee, K.J. Yoon, J.W. Son, S. Yang, B.K. Kim, J.H. Lee, H.W. Lee, J.H. Lee, H.I. Ji*, Naturally diffused sintering aid for highly conductive bilayer electrolytes in solid oxide cells, Science Advances, 7 (2021) 8590.

4. H.I. Ji*, B.K. Kim, J.W. Son, K.J. Yoon, J.H. Lee*, Influence of sintering activators on electrical property of BaZr0.85Y0.15O3-δ proton-conducting electrolyte, Journal of Power Sources, 507 (2021) 230296.

5. J. Kim, J.H. Kim, K.J. Yoon, J.W. Son, J.H. Lee, H.W. Lee, H.I. Ji*, Solid oxide fuel cells with zirconia/ceria bilayer electrolytes via roll calendering process, Journal of Alloys and Compounds, 846 (2020) 156318.

6. J. Shin, J.H. Park, J. Kim, K.J. Yoon, J.W. Son, J.H. Lee, H.W. Lee, H.I. Ji*, Suppression of processing defects in large-scale anode of planar solid oxide fuel cell via multi-layer roll calendering, Journal of Alloys and Compounds, 812 (2020) 152113.

7. A. Jan, J. Shin, J. Ahn, S. Yang, K.J. Yoon, J.W. Son, H. Kim, J.H. Lee, H.I. Ji*, Promotion of Pt/CeO 2 catalyst by hydrogen treatment for low-temperature CO oxidation, RSC Advances, 9 (2019) 27002-27012.

8. J. Kim, J. Ahn, J. Shin, K.J. Yoon, J.W. Son, J.H. Lee, D. Shin, H.W. Lee, H.I. Ji*, Enhanced sinterability and electrochemical performance of solid oxide fuel cells via a roll calendering process, Journal of Materials Chemistry A, 7 (2019) 1055-1063.

9. S.M. Choi, H. An, K.J. Yoon, B.K. Kim, H.W. Lee, J.W. Son, H. Kim, D. Shin*, H.I. Ji*, J.H. Lee*, Electrochemical analysis of high-performance protonic ceramic fuel cells based on a columnar-structured thin electrolyte, Applied Energy, 233-234 (2019) 29-36.

10. S.M. Choi, J. Ahn, J.W. Son, J.H. Lee, B.K. Kim, K.J. Yoon, H.I. Ji*, Comprehensive understanding of cathodic and anodic polarization effects on stability of nanoscale oxygen electrode for reversible solid oxide cells, ACS Applied Materials & Interfaces, 10 (2018) 39608-39614.

11. H. An, H.W. Lee, B.K. Kim, J.W. Son, K.J. Yoon, H. Kim, D. Shin*, H.I. Ji*, J.H. Lee*, A scalable high-performance protonic ceramic fuel cell, Nature Energy, 3 (2018) 870-875.

12. H.I. Ji*, H. Kim, H.W. Lee, B.K. Kim, J.W. Son, K.J. Yoon, J.H. Lee, Open-cell voltage and electrical conductivity of a protonic ceramic electrolyte under two chemical potential gradients, Physical Chemistry Chemical Physics, 20 (2018) 14997-15001.

13. S. Choi, C.J. Kucharczyk, Y. Liang, X. Zhang, I. Takeuchi, H.I. Ji, S.M. Haile, Exceptional power density and stability at intermediate temperatures in protonic ceramic fuel cells, Nature Energy, 3 (2018) 202-210.

14. H.I. Ji, X. Xu, S.M. Haile, Chemical surface exchange of oxygen on CeO2-δ in an O2/H2O atmosphere, Physical Chemistry Chemical Physics, 19 (2017) 29287-29293.

15. H.I. Ji, T.C. Davenport, M.J. Ignatowich, S.M. Haile, Gas-Phase vs Material-Kinetic Limits on the Redox Response of Nonstoichiometric Oxides, Physical Chemistry Chemical Physics, 19 (2017)

7420-7430.

16. H.I. Ji, J. Hong, K.J. Yoon, J.W. Son, B.K. Kim, H.W. Lee, J.H. Lee, Investigation of the electrochemical reactions at a limited-contact La1-xSrxMnO3/Y-doped ZrO2 interface with a rod-type ionic-probe, Journal of Power Sources, 330 (2016) 285-291.

17. H.I. Ji, T.C. Davenport, C.B. Gopal, S.M. Haile, Extreme high temperature redox kinetics in ceria: Exploration of the transition from gas-phase to material-kinetic limitations, Physical Chemistry Chemical Physics, 18 (2016) 21554-21561.

18. H.I. Ji, S.M. Choi, K. Yoon, J.W. Son, B.K. Kim, H.W. Lee and J.H. Lee, Influence of wet atmosphere on electrical and transport properties of lanthanum strontium cobalt ferrite cathode materials for protonic ceramic fuel cells, Solid State Ionics, 249-250 (2013) 112-116.

19. H.I. Ji, J. Hwang, K. Yoon, J.W. Son, B.K. Kim, H.W. Lee and J.H. Lee, Enhanced oxygen diffusion kinetics in epitaxial perovskite thin films for low-temperature solid oxide fuel cells, Energy & Environmental Science, 6 (2013) 116-120.

20. H.I. Ji, B.K. Kim, J.H. Yu, S.M. Choi, H.R. Kim, J.W. Son, H.W. Lee, J.H. Lee, Three dimensional representations of partial ionic and electronic conductivity based on defect structure analysis of BaZr0.85Y0.15O3-δ, Solid State Ionics, 203 (2011) 9-17.