AI Article Synopsis
- Silicon (Si) shows promise for photoelectrochemical (PEC) water splitting due to its beneficial properties, but struggles with slow reaction rates and stability in water.
- Researchers developed a hybrid system using CuCo oxides with TiO-coated silicon nanowires to enhance performance.
- Key factors like TiO thickness and CuCo concentration were optimized, leading to better light absorption and charge transfer, improving the overall efficiency of the PEC process.
Article Abstract
Silicon (Si) is an attractive candidate for photoelectrochemical (PEC) water splitting because of its small band gap, fast carrier mobility and abundant reserves. However, the PEC performance has been severely limited by the sluggish kinetics of oxygen/hydrogen evolution reaction at the Si photoelectrode/electrolyte interface and poor stability in the aqueous environment. Herein, the bifunctional CuCo hybrid oxides (CuCo-HO) cocatalysts have been integrated with ultrathin TiO decorated n-type and p-type Si nanowires (NWs) to simultaneously improve the photoactivity and stability of Si photoelectrodes. The thickness of TiO layer, the concentration of CuCo-precursor and the hydrothermal reaction time have been investigated to optimize the PEC performance. The enhancement mechanism is studied and mainly ascribed to the increased light harvesting, small charge transfer resistance and high carrier density of Si NWs/TiO/CuCo-HO photoelectrodes.
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| http://dx.doi.org/10.1088/1361-6528/aad7a0 | DOI Listing |
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