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Enhancing the Optical Absorption and Interfacial Properties of BiVO4 with Ag3PO4 Nanoparticles for Efficient Water Splitting
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-09 00:00:00 , DOI: 10.1021/acs.jpcc.8b00738
Maged N. Shaddad 1 , Drialys Cardenas-Morcoso 2 , Prabhakarn Arunachalam 1 , Miguel García-Tecedor 2 , Mohamed A. Ghanem 1 , Juan Bisquert 2 , Abdullah Al-Mayouf 1 , Sixto Gimenez 2
Affiliation  

Photoelectrochemical water splitting using semiconductor materials has emerged as a promising approach to produce hydrogen (H2) from renewable resources such as sunlight and water. In the present study, Ag3PO4 nanoparticles were electrodeposited on BiVO4 photoanodes for water splitting. A remarkable water oxidation photocurrent of 2.3 mA·cm–2 at 1.23 V versus reversible hydrogen electrode with ∼100% Faradaic efficiency was obtained, which constitutes a notable increase compared to the pristine BiVO4 photoanode. It is demonstrated that the enhancement of optical absorption (above-band gap absorbance) and the decrease of surface losses after the optimized deposition of Ag/Ag3PO4 nanoparticles are responsible for this notable performance. Remarkably, this heterostructure shows promising stability, demonstrating 25% decrease of photocurrent after 24 h continuous operation. This approach may open new avenues for technologically exploitable water oxidation photoanodes based on metal oxides.

中文翻译:

Ag 3 PO 4纳米颗粒增强BiVO 4的光吸收和界面性质,以实现有效的水分解

使用半导体材料进行光电化学水分解已成为一种有前途的方法,可以从可再生资源(例如阳光和水)中产生氢(H 2)。在本研究中,将Ag 3 PO 4纳米颗粒电沉积在BiVO 4光电阳极上进行水分解。与可逆氢电极相比,法拉第效率约为100%,在1.23 V时获得了2.3 mA·cm -2的水氧化光电流,与原始BiVO 4光电阳极相比,显着增加。结果表明,优化的Ag / Ag沉积后,光吸收(带隙吸收以上)的增强和表面损耗的减少3 PO 4纳米颗粒是这种显着性能的原因。值得注意的是,这种异质结构显示出令人鼓舞的稳定性,表明连续运行24小时后光电流降低了25%。这种方法可以为基于金属氧化物的技术上可利用的水氧化光阳极开辟新的途径。
更新日期:2018-05-09
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