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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium High Temperature Electrochemistry IV
Presentation Title Advances in Solid Oxide Membrane Based Electrolysis for Solar-grade Silicon Deposition
Author(s) Michelle Sugimoto, Haoxuan Yan, Federico Coppo, Adam Powell, Uday B. Pal
On-Site Speaker (Planned) Michelle Sugimoto
Abstract Scope Currently, photovoltaic (PV) cells, which utilize available solar energy with zero end-user emissions, are dominated by polycrystalline silicon designs. The cost of PV has dropped drastically in the last several decades. However, the current solar-grade Si production process is highly energy and cost intensive, and is not easily scaled up. In this work, an alternate production route, akin to the Hall-Héroult process used for aluminum production, has been developed. Here, we present a high-temperature, molten oxide-fluoride bath electrolysis cell capable of depositing a planar layer of Si starting from abundantly sourced silica onto a Si wafer cathode. An optimized alternating square wave signal was developed and applied across the cell in order to periodically redissolve any dendritic growth back into the molten salt. This ensured a uniform, planar deposition of Si. Finally, an optimized rare-earth nickelate anode was developed, removing costly and/or volatile precious metals from the system.
Proceedings Inclusion? Planned:
Keywords Process Technology, Sustainability, High-Temperature Materials


A Comparative Study of Working Electrode Materials for Voltammetry Measurements in LiCl–Li2O Salts
Advances in Solid Oxide Membrane Based Electrolysis for Solar-grade Silicon Deposition
Effect of Hydroxide and Oxide Impurities in Electrochemical Processes Using Molten LiCl and CaCl2
Electrochemical Reactions of Oxide Ions with Tungsten in Molten CaCl2
Feasibility of Potentiometry for Monitoring Activity of GdCl3 in Molten LiCl-KCl Salt
First-principles Molecular Dynamics and CALPHAD Modeling of the CaF2-MgF2-SiO2 Molten Salt System
Fundamental Challenges for the Development of Electrolytic Reduction of Uranium Oxide in Molten LiCl-Li2O
High-speed Electrodeposition of Textured Monolithic Lithiated Transition Metal Oxide Cathodes for Low Cost, High Energy, and Fast Charging Li-ion Batteries.
Interaction between Solute Species and Metallic Alloying Elements in Molten Chloride Systems
Investigation on Preparation of Fe-Al Alloys by Direct Reduction of Fe2O3-Al2O3 Powder in CaCl2-NaCl Molten Salt System
Liquid Bipolar Electrode for Extraction of Aluminium and PGM Concentrate from Spent Catalysts
Molten Hydroxide Mediated Electrosynthesis of Layered Transition Metal Oxides for Electrochemical Energy Storage
New Electrochemical Deoxidation Method of Ti Metal in Molten Salts Containing YCl3
Optimizing Reaction Selectivity in High Temperature Molten Electrolytes
Selective Extraction of Gold from Gold-copper Alloy Using Anodic Electrochemical Deposition in Molten Salt Electrolyte
Validated Modeling of Quartzite Reduction to Solar Silicon by Molten Salt Electrolysis

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