In this study, we demonstrated high-rate H2 generation by coupling with the sulfite oxidation reaction (SOR) as an alternative to the oxygen evolution reaction for solar H2 production. The emerging and cost-effective molybdenum phosphide electrocatalyst was appropriately optimized and used as a bifunctional catalyst in an alkaline electrolyte for both SOR and HER. Powered by state-of-the-art perovskite–Si tandem photovoltaics, a remarkable photocurrent density of over 17 mA cm−2 was achieved in the HER coupled with the SOR. In addition to the significantly enhanced photocurrent, the SOR can further reduce the overall cost of solar H2 production owing to the elimination of the expensive membranes required for H2 and O2 gas separation. Considering the high global demand for desulfurization via the SOR, the strategy proposed here will enable practical H2 production from renewable sources while effectively converting the toxic SO2 gas into a value-added product for the chemical industry.
Bibliographical noteFunding Information:
This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT, Republic of Korea ( 2021R1A3B1068920 , 2021M3H4A1A03049662 , and 2021M3D1A2051636 ). This research was also supported by the Yonsei Signature Research Cluster Program of 2021 , Republic of Korea ( 2021-22-0002 ).
© 2021 Elsevier B.V.
- Molybdenum phosphide
- Solar hydrogen
- Sulfite oxidation reaction
- Tandem photovoltaics
- Water splitting
ASJC Scopus subject areas
- General Environmental Science
- Process Chemistry and Technology