Citation: Shaoce Zhang, Zhifeng Liu, Weiguo Yan, Zhengang Guo, Mengnan Ruan. Decorating non-noble metal plasmonic Al on a TiO₂/Cu₂O photoanode to boost performance in photoelectrochemical water splitting[J]. Chinese Journal of Catalysis, ;2020, 41(12): 1884-1893. doi: 10.1016/S1872-2067(20)63637-3 shu

Decorating non-noble metal plasmonic Al on a TiO₂/Cu₂O photoanode to boost performance in photoelectrochemical water splitting

Shaoce Zhang ^a, ,
Zhifeng Liu ^a,b ,
Weiguo Yan ^b ,
Zhengang Guo ^a,b ,
Mengnan Ruan ^a,b

a School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China;
b Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China

Received Date: 13 March 2020
Revised Date: 21 April 2020

Fund Project: This work was supported by the Science Funds of Tianjin for Distinguished Young Scholar (17JCJQJC44800) and Key Research and Development Plan of Tianjin (19YFSLQY00020).

Designing low-cost and high-performance photoelectrodes with improved light harvesting and charge separation rates is significant in photoelectrochemical water splitting. Here, a novel TiO₂/Cu₂O/Al/Al₂O₃ photoelectrode is manufactured by depositing plasmonic nanoparticles of the non-noble metal Al on the surface of a TiO₂/Cu₂O core/shell heterojunction for the first time. The Al nanoparticles, which exhibit a surface plasmon resonance (SPR) effect and are substantially less expensive than noble metals such as Au and Ag, generate hot electron-hole pairs and amplify the electromagnetic field at the interface under illumination. The as-prepared TiO₂/Cu₂O/Al/Al₂O₃ photoelectrodes have an extended absorption range and enhanced carrier separation and transfer. Their photocurrent density of 4.52 mA·cm^-2 at 1.23 V vs. RHE represents an 1.84-fold improvement over that of TiO₂/Cu₂O. Specifically, the ultrathin Al₂O₃ passivation layer spontaneously generated on the surface of Al in air could act as a protective layer to significantly increase its stability. In this work, the synergistic effect of the heterojunctions and the SPR effect of the non-noble metal Al significantly improve the photoelectrode performance, providing a novel concept for the design of electrodes with good properties and high practicability.
- TiO₂,
- Photoanode,
- Non-noble metal Al,
- Surface plasmon resonance,
- Photoelectrochemical water splitting
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Decorating non-noble metal plasmonic Al on a TiO₂/Cu₂O photoanode to boost performance in photoelectrochemical water splitting