Exploiting inexhaustible free energy from the sun to produce clean and sustainable fuels is an attractive route toward the heavily polluted earth and energy shortage. Photoelectrochemical cell is strategic energy device because the generated fuels can be stored and used on-demand. Herein, we present the fabrication of Si photoelectrodes with efficient charge separation and transfer using metal-insulator-semiconductor heterostructures for energy-rich fuel production via photoelectrochemical water and urea oxidation. With controls of the native SiOx insulator layer and catalytic NiFe metal layer, Si photoelectrode exhibits a photovoltage of 530 mV and a photocurrent density of 33.3 mA cm−2 at 1.23 V versus reversible hydrogen electrode. Further employed Ni(OH)2 catalysts allow Si photoanode to achieve fill factor of 25.73% and solar-to-hydrogen conversion efficiency of 10.8% with a perovskite/Si tandem solar cell. The fabricated Ni(OH)2/NiFe/n-Si photoanode shows considerable performances toward urea oxidation. Our work presents new insights into sunlight-assisted hydrogen production using wastewater.
|Journal||Applied Catalysis B: Environmental|
|Publication status||Published - 2022 Nov 15|
Bibliographical noteFunding Information:
S.A.L. and J.W.Y. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea government MSIT ( 2021R1A2B5B3001851, 2021R1A4A302787811, 2018M3D1A1058793 ). This work was also supported by the KRISS ( Korea Research Institute of Standards and Science ) MPI Lab. Program. S.A.L. acknowledges the Sejong Science Fellowship through the National Research Foundation of Korea funded by the Korea government MSIT ( 2021R1C1C2006142 ). J.W.Y. acknowledges the Basic Science Research Program through NRF by the Ministry of Education ( 2021R1A6A13046700 ). The Inter-University Semiconductor Research Center and Institute of Engineering Research at Seoul National University provided research facilities for this work.
© 2022 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Process Chemistry and Technology