Peng Bai

Peng Bai

Pronouns: He/him/his
Associate Professor

Energy, Environmental & Chemical Engineering

  • Phone
  • Office
    Brauer Hall, Room 3005
  • Lab location
    Brauer Hall, Room 2030


Inventing new analytical tools, both experimental and mathematical, to investigate the fundamental science in advanced electrochemical energy systems


Professor Bai’s research focuses on the development of next-generation batteries. The Battery Analytical Investigation (BAI) Group he leads adopts a combined theoretical and experimental approach to

(i) probe the in situ electrochemical dynamics of miniature electrodes down to nanoscales;

(ii) capture the heterogeneous and stochastic nature of advanced electrodes to understand and optimize the macroscopic behavior; and

(iii) identify the theoretical pathways and boundaries for the rational design of materials, electrodes and batteries through physics-based mathematical modeling and simulation.

Knowledge and tools developed in the BAI Group also apply to and benefit the design of other electrochemical energy systems like supercapacitors and fuel cells.


Jointly trained at MIT and Tsinghua University, Professor Bai obtained his PhD degree in Mechanical Engineering from Tsinghua University in 2012. He continued his research in the Department of Chemical Engineering at MIT as a postdoctoral associate, then senior postdoctoral associate and research scientist, prior to joining Washington University in St. Louis as a tenure-track Assistant Professor in 2017. With his expertise in physics-based mathematical modeling and analytical electrochemistry, Professor Bai has published original research in scientific journals including Science, Nature Communications, Energy & Environmental Science, Nano Letters, etc. His unique contributions earned him the Oronzio and Niccolò De Nora Foundation Young Author Prize from the International Society of Electrochemistry (ISE) in 2014, and the ISE Prize for Electrochemical Materials Science in 2018.