Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.216
Publication date: 18th July 2019
The combination of thin film photo-absorbers with nanostructured metal oxide semiconductor catalysts in a hybrid tandem device stands out as a promising approach for robust and cost-effective ‘bias-free’ conversion of solar energy into chemical energy, stored in solar fuels or added values products. In this context, the integration of a Ni-Fe based electro-catalyst for water oxidation with a triple-junction Si photovoltaic solar cell, is an interesting proposal due to the abundant nature of its constituents and the proven effectivity of each individual component. The water oxidation catalyst (WOC) is composed by the mixed oxide NiFe2O4 -which provides the main actives sites for water oxidation catalysis after electrochemical treatment, and nanostructured α-Fe2O3, acting as co-catalyst. Due to the complexity of Ni-Fe catalyst, a rigorous analysis of the electrode surface is needed in order to reveal the role of each component during water splitting operation. Further, with the WOC coupling to a Si-based triple-junction photovoltaic cell (a-Si:H/a-Si:H/μc-Si:H), 7.7 % of Solar-To-Hydrogen conversion efficiency for the tested photovoltaic-electrochemical cell was achieved. These studies sustain that integrated photovoltaic-electrochemical configurations constitute an attractive and viable alternative to efficient and low-cost solar energy conversion when using Earth-abundant materials.
This work was funded by the European Union’s Horizon 2020 project A-LEAF (grant agreement No 732840).
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