Selecting moderate semiconducting materials for photoelectrochemical (PEC) cells is essential to achieve high solar-energy conversion. Despite the advantageous features of silicon, such as earth abundance and narrow band gap, silicon suffers from severe photocorrosion. Here, heterogeneous nickel-based catalysts produced via electrodeposition are investigated to expedite water oxidation and protect the silicon from corrosion. The morphology of the catalysts and their PEC performances are demonstrated in detail. Synergistic Ni nanoparticles (NPs)/Ni(OH)2/n-Si photoanode shows a high photocurrent density of 29.6 mA cm−2 at 1.23 V versus RHE and operates over 140 h. Owing to the insufficient photovoltage generated by a single photoanode, we introduce a perovskite/Si tandem solar cell as a voltage supplier. The fabricated wired tandem device shows a photocurrent density of 9.8 mA cm−2, corresponding to a solar-to-hydrogen (STH) conversion efficiency of 12% without external bias. Our work may present a promising pathway toward a design of spontaneous energy conversion devices.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea ( NRF ) grant funded by the Korean Ministry of Science and ICT (MSIT) ( 2019M3E6A1103818 ), the Korean Ministry of Science, ICT and Future Planning ( MSIP ) ( 2012R1A3A2026417 ), the Basic Science Research Program through an NRF grant funded by MSIP ( 2017R1A2B3009135 ), the Creative Material Discovery Program through an NRF grant funded by the MSIT ( 2018M3D1A1058793 ), the Basic Research Laboratory of the NRF funded by the MSIT ( 2018R1A4A1022647 ), and Korea Hydro & Nuclear Power Co., Ltd. (no. 2018-Tech-21 ). S.A.L. acknowledges the Global Ph.D. Fellowship Program through the National Research Foundation of Korea funded by the Ministry of Education ( 2017H1A2A1044293 ).
© 2020 The Author(s)
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Materials Science(all)