Lab overview
  • SOFC activation
    Solid oxide fuel cells
    Rational design of better SOFC cathode materials through a fundamental understanding of the role of surface electronic structure and chemistry on the oxygen reduction reaction, including the effects of stress and hetero-interfaces.
  • Pyrite surface pitting
    Nanoscale pitting on surface films
    Point defect agglomeration leads to formation of pits on surface passive films, exemplified on pyrite, as a root-cause of pitting corrosion.
  • Cladding Degradation
    Cladding corrosion
    Mechanisms and kinetics of corrosion and hydrogen pick up in nuclear fuel cladding made of Zr alloys, assessed as a function of alloying elements and stress.
  • Flow stress upturn
    Degradation of microstructure at long time scale
    Modeling defect structure evolution and slow processes using newly adapted activation relaxation based atomistic techniques with extended time scales.
  • Strained Electrocatalysts
    Strained electrocatalysts
    Accelerate oxygen reduction and diffusion in mixed conducting electrocatalysts through easier formation and migration of oxygen vacancies by application of mechanical stress.

Yildiz Group's research focuses on laying the scientific groundwork and proof-of-principle material systems for the next generation of high-efficiency devices for energy conversion and information processing, based on solid state ionic-electronic materials. The scientific insights derived from our research impact the design of novel surface/interface chemistries for:

- efficient and durable solid oxide fuel cells,
- redox based memristive information storage and logic,
- efficient and durable thermo/electro-chemical splitting of water and CO2,
- high energy density and high power density solid state batteries, and
- corrosion resistant films in a wide range of extreme environments as in nuclear energy generation, concentrated solar energy, and oil exploration.

We have thus far made significant contributions in advancing the molecular-level understanding of oxygen reduction and oxidation kinetics on mixed ionic-electronic solid surfaces. Specifically we have uncovered the effects of elastic strain, dislocations, temperature and oxygen pressure on the reactivity and degradation of mixed ionic/electronic materials, by combining theoretical and experimental analyses of surface electronic structure, defect mobility and composition.

The key findings in much of our work are obtained through our development of in-situ scanning tunnelling spectroscopy and x-ray spectroscopy methods in conjunction with first-principles calculations and novel atomistic simulations.

Recent News

  1. International team, including Yildiz and Adepalli, decode new processes in ReRAMs.[link]
  2. Congratulations to Wen Ma for successfully defending his Ph.D. thesis!
  3. Congratulations to Sean for winning the Young Scientist Award, to Dario for being a finalist at the YAS competition, to Kiran and Tobi for best poster awards, to Lixin and Qiyang for excellent oral and poster presentations, at the Solid State Ionics Conference!
  4. Congratulations to Dr. Yan Chen for winning a continuing Faculty of the Future Fellowship from the Schlumberger Foundation!
  5. Congratulations to Lixin and Minh for winning Nuclear Science and Engineering Annual Awards! [link]
  6. Lixin's research work is profiled in an article on the MIT News website. [link]

Recent Paper

Publication image

Dislocations in SrTiO3: easy to reduce but not so fast for oxygen transport

Dario Marrocchelli, Lixin Sun, and Bilge Yildiz
Journal of the American Chemical Society, 137 14, 4735-4748, 2015. DOI: 10.1021/ja513176u

© 2013, The Yildiz Group, Massachusetts Institute of Technology