Electrochemical water splitting to hydrogen and oxygen is an attractive approach
to store and convert intermittent renewable energy sources. Energy efficient, cost
effective and durable electrochemical systems are highly required. Firstly, CeOx
coated oxygen evolution electrocatalysts were developed to improve the stability.
Unique permselectivity of the CeOx layer was disclosed, which helps to prevent
dissolution of active metal site. Because oxygen evolution reaction requires a
higher overpotential than hydrogen evolution reaction, kinetically facile oxidation
of soluble redox ions was proposed as an alternative anodic reaction, in which the
oxidized redox ions can be used for succeeding homogeneous reactions, such as
treatment of H2S. How to tune the thermodynamics and the diffusion of candidate
redox ions is discussed for a desired application. In addition to the anodic
reaction, cathodic hydrogen evolution reaction has to be optimized. To maximize
hydrogen evolution performance in near-neutral pH buffered conditions,
concentration overpotentials from local pH and hydrogen on a Pt cathode are
distinguished by mass transport modelling. Finally, stand-alone module was
developed to perform solar-driven redox-mediated H2S splitting to H2 and S under
natural solar irradiation.
| Identifer | oai:union.ndltd.org:kaust.edu.sa/oai:repository.kaust.edu.sa:10754/655949 |
| Date | 06 1900 |
| Creators | Obata, Keisuke |
| Contributors | Takanabe, Kazuhiro, Physical Science and Engineering (PSE) Division, Esposito, Daniel, Saikaly, Pascal, Huang, Kuo-Wei |
| Source Sets | King Abdullah University of Science and Technology |
| Language | English |
| Detected Language | English |
| Type | Dissertation |
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