1. Multifunctional nano-heterogeneous Ni(OH)2/NiFe catalysts on silicon photoanode toward efficient water and urea oxidation.
- Author
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Lee, Sol A, Yang, Jin Wook, Lee, Tae Hyung, Park, Ik Jae, Kim, Changyeon, Hong, Sung Hyun, Lee, Hyungsoo, Choi, Sungkyun, Moon, Jooho, Kim, Soo Young, Kim, Jin Young, and Jang, Ho Won
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OXIDATION of water , *SILICON solar cells , *SOLAR cells , *METALLIC films , *PHOTOELECTROCHEMICAL cells , *STANDARD hydrogen electrode , *CATALYSTS , *PHOTOCATHODES - Abstract
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 SiO x 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. [Display omitted] • Tailored MIS photoanode based on the insulating SiOx layer, composition-controlled NiFe metal film, and Ni(OH) 2 catalyst. • Spontaneous water oxidation with STH conversion efficiency of 10.8% implemented by the PV-PEC tandem device. • Urea oxidation with a low onset potential of 0.83 V vs. RHE by the nano-heterogeneous Ni(OH) 2 /Ni 0.5 Fe 0.5 /SiO x /n-Si photoanode. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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