Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
Production of green H2 is possible using photoelectrochemical (PEC) water splitting since it does not use fossil fuels, but only sunlight and water are required as inputs. However, the industrial use of green H2 is hindered due to the higher cost of delivered H2, compared to steam reforming. This is due to the lower efficiencies of the PEC systems and the use of critical raw materials (CRM).
The PEC water-splitting cell consists of two components, the cathode, where H2 is evolved, and the anode, where O2 is evolved. The objective of the OHPERA project is to establish a novel paradigm in PEC H2 production, by utilizing Pb-free halide perovskites nanocrystals (PNCs).
PNCs have become very promising semiconductors due to their high Photoluminescent Quantum Yield (PLQY) and tunable bandgap. Amongst them, Pb-based PNCs have shown excellent power conversion efficiencies (PCE), greater than 20%. However, due to apprehensions about the toxicity of lead, alternatives like tin, germanium, and antimony are being studied extensively. Out of these, tin has proven to be the most promising substitute, due to their smaller optical bandgaps and higher charge mobilities.
Tin-based perovskites suffer significant drawbacks like having lower stability due to the low redox potential of Sn2+, and lower PCE due to the same.
The scope of this work is to synthesize Sn-based PNCs using alternative and novel methods so that they can be used as photoelectrode to carry out PEC reactions in polar solvents with high stability.
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