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Lanthanum chromite for visible light-driven photocatalytic hydrogen evolution

Authors: 

Hanggara Sudrajat, Sri Hartuti, Truong Khang Nguyen

Source title: 
Optik, 207: 163807, 2020 (ISI)
Academic year of acceptance: 
2020-2021
Abstract: 

Lanthanum chromite (LaCrO3) photocatalysts have been successfully prepared via a sol-gel route followed by thermal treatment through calcination in air atmosphere. The structures and properties of the as-prepared samples are examined with various techniques, including synchrotron X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). Their photocatalytic activity on hydrogen evolution from aqueous methanol solution is investigated under visible light (λ > 400 nm). Results show that the local structures and chemical states of the cations, La3+ and Cr3+, are insensitive to the calcination temperature, as confirmed by XANES and EXAFS. The highest hydrogen evolution rate is achieved by the LaCrO3 sample calcined at 1100 °C and loaded with 0.01 wt% Pt co-catalyst, which is 2.11 μmol/h.