"An Iron Oxide Mediated Solar Decoupled Electrolysis Cycle" by Sarah Hill and Paul F. Smith
 

An Iron Oxide Mediated Solar Decoupled Electrolysis Cycle

Faculty Sponsor

Paul Smith

Discipline(s)

Chemistry

ORCID Identifier(s)

0000-0001-5223-0690

Presentation Type

Oral Presentation

Symposium Date

Spring 4-25-2024

Abstract

We present a proof of concept demonstration of solar thermochemical energy storage. The James Markiewicz Solar Energy Research Facility (SERF) at Valparaiso University uses concentrated sunlight to reduce hematite at 1500 ℃, evolving oxygen and producing magnetite. Magnetite can then be dissolved in water at pH 5 using hydroxyethylidene diphosphonic acid (HEDP). Aqueous Fe2+ serves as the anode for the reduction of water to hydrogen, as demonstrated by a visual H2 detection assay. Finally, alkaline solutions of Fe3+ + HEDP upon concentration produce a precipitate characterized as goethite α-FeOOH by Raman spectroscopy, completing the cycle.

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