News & Events


Electrochemistry in the molten state: from sustainable metal extraction to materials fundamentals

Antoine Allanore, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA

Tuesday, May 2, 2017
9:30 a.m.
Hopeman 224

Metals and metallurgy played a foundational role in the materials science we learn today, in particular
to demonstrate how condensed matter physics allows the prediction of solid-state properties. Similar
predictive capacity is lacking for the molten state, and liquid metals and molten oxide or sulfide are again
remarkable candidates to progress in that endeavor.

Independently of this conceptual lanscape, metals remain at the basis of modern society and their
affordable and environmentally respectable extraction and recycling is required. In the context of 9 billion
people by 2050 and issues such as greenhouse gas emissions, my research group aims at developing
alternative approaches for metals extraction and processing. The electrochemistry of the molten state is an
integral part of our endeavor, compatible with the deployment of sustainable electric power generation [1].
This seminar offers to report electrochemical studies of a subset of molten oxide [2,3] and sulfide [4] systems.
Our results show that the molten state offers unique functionalities (enhanced mass transport, high
conductivity, electronic conductivity, thermoelectric power) and that electrochemistry is uniquely positioned
to probe the structure and physical chemistry of those systems. In addition, our results provide valuable
thermodynamic information, and our experimental developments suggest a faster path to experimental data,
along with an improvement in the prediction and modeling capacity of the molten state.

[1] A. Allanore, Contribution of Electricity to Materials Processing: Historical and Current Perspectives, JOM,
65(2), 131, (2013)
[2] A. Allanore, Features and Challenges of Molten Oxide Electrolytes for Metal Extraction, Journal of the
Electrochemical Society, 162(1), 13-22, (2015)
[3] A. Allanore, L. Yin & D. R. Sadoway, A New Anode Material for Oxygen Evolution in Molten Oxide
Electrolysis. Nature, 497(7449), 353–356, (2013)
[4] S. Sokhanvaran, S.-K. Lee, G. Lambotte & A. Allanore, Electrochemistry of Molten Sulfides: Copper
Extraction from BaS-Cu2S. Journal of The Electrochemical Society, 163(3), 115–120, (2016)