Journal
ACS CATALYSIS
Volume 9, Issue 4, Pages 3627-3632Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b00578
Keywords
Magneli phase; photocatalysis; H-2 evolution; titanium Suboxide; anatase
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Funding
- ERC
- DFG within the framework of its Excellence Initiative for the Cluster of Excellence Engineering of Advanced Materials
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Magneli phases of titanium dioxide (such as Ti4O7, Ti5O9, etc.) provide electronic properties, namely, a stable metallic behavior at room temperature. In this manuscript, we demonstrate that nanoscopic Magneli phases, formed intrinsically in anatase during a thermal aerosol synthesis, can enable significant photocatalytic H-2 generation-this without the use of any extrinsic cocatalyst in anatase. Under optimized conditions, mixed-phase particles of 30% anatase, 25% Ti4O7, and 20% Ti5O9 are obtained that can provide, under solar light, direct photocatalytic H-2 evolution at a rate of 145 mu mol h(-1) g(-1). These anatase particles contain 5-10 nm size intergrown phases of Ti4O7 and Ti5O9. Key is the metallic band of Ti4O7 that induces a particle internal charge separation and transfer cascade with suitable energetics and favorable dimensions that are highly effective for H-2 generation.
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