Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 52, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202006919
Keywords
co-catalyst-free; in situ formation; perovskite heterojunctions; photocatalytic hydrogen evolution
Categories
Funding
- Research Grants Council of Hong Kong [21203518, 8730049, 9048121]
- City University of Hong Kong [7005289, 9680208, 9667213, 9052029]
- Shenzhen Science Technology and Innovation Commission [R-IND12302]
- National Natural Science Foundation of China [61874165, 21833009]
- Major State Basic Research Development Program of China [2019YFB1503401, 42544QK]
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Solar-to-fuel conversion with organic-inorganic hybrid halide perovskites has attracted growing attention as a result of their excellent optoelectronic properties as well as the low temperature of the solution based fabrication process. However, the most comprehensively developed hybrid perovskite materials are comprised of the toxic metal lead, raising concerns about environmental health threats. Herein, a lead-free bismuth (Bi)-based hybrid perovskite showing in situ growth of heterojunctions is successfully developed at the interface of methylammonium bismuth iodide (MA(3)Bi(2)I(9)) and tri(dimethylammonium) hexa-iodobismuthate (DMA(3)BiI(6)) by a facile solvent engineering technique. The air-stable MA(3)Bi(2)I(9)/DMA(3)BiI(6)perovskite heterostructure with enhanced photoinduced charge separation exhibit outstanding visible-light-induced photocatalytic activity for H(2)evolution in aqueous hydrogen iodide solution. The powdered MA(3)Bi(2)I(9)/DMA(3)BiI(6)heterostructured composite (BBP-5) shows a H(2)evolution rate of 198.2 mu mol h(-1)g(-1)without the addition of Pt co-catalysts under 100 mW cm(-2)of visible-light (lambda >= 420 nm) illumination.
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