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Rational design of photoelectrochemical cells towards bias-free water splitting: Thermodynamic and kinetic insights
journal contributionposted on 04.05.2020 by Hao Zhang, H Wang, Jin Xuan
Any type of content formally published in an academic journal, usually following a peer-review process.
© 2020 Elsevier B.V. Photoelectrochemical (PEC) water splitting offers a promising way to produce hydrogen and harvest solar energy, however, its low efficiency has made it less economically attractive than other hydrogen production methods. Herein we present a numerical model of PEC cells considering quasi-fermi level splitting and interfacial kinetics to understand the charge transfer process and explore the approaches to increase the energy conversion efficiency. The non-linear change of photocurrent with light intensity under concentrated illumination is for the first time captured by a model. Based on the model, the operation regions of a PEC cell are mapped. Pathways to further promote the energy efficiency of PEC are proposed from the aspect of kinetics and thermodynamics. A new method that enables a precise evaluation of the theoretical boundaries of energy conversion efficiency of photocatalysts is developed taking into account the thermodynamics barrier.
UK Engineering and Physical Sciences Research Council (EPSRC) via grant number EP/R012164/2 and EP/S000933/1
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering