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Enhancing the Optical Absorption and Interfacial Properties of BiVO 4 with Ag 3 PO 4 Nanoparticles for Efficient Water Splitting

2018; American Chemical Society; Volume: 122; Issue: 22 Linguagem: Inglês

10.1021/acs.jpcc.8b00738

1932-7455

Maged N. Shaddad, Drialys Cárdenas-Morcoso, Prabhakarn Arunachalam, Miguel García‐Tecedor, Mohamed A. Ghanem, Juan Bisquert, Abdullah M. Al‐Mayouf, Sixto Giménez,

Copper-based nanomaterials and applications

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.