This has motivated attempts to develop photocatalysts with enhanced charge-separation properties using defect engineering, [5,6] facet engineering, [7][8][9] and the construction of heterojunctions. [10][11][12] Recently, molten salt treatments have been used for synthesis and to optimize photocatalyst properties. [13,14] In a molten salt, the mass transfer between precursors is accelerated and, compared with conventional solid-state synthesis, lower reaction temperatures can be used. [15,16]
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