Phase transition-induced band edge engineering of BiVO
Through phase transition-induced band edge engineering by dual doping with In and Mo, a new greenish BiVO[subscript 4] (Bi[subscript 1-X]In[subscript X]V[subscript 1-X]Mo[subscript X]O[subscript 4]) is developed that has a larger band gap energy than the usual yellow scheelite monoclinic BiVO[subscr...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
National Academy of Sciences (U.S.)
2017
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| Online Access: | http://hdl.handle.net/1721.1/108674 https://orcid.org/0000-0001-8345-4937 |
| Summary: | Through phase transition-induced band edge engineering by dual doping with In and Mo, a new greenish BiVO[subscript 4] (Bi[subscript 1-X]In[subscript X]V[subscript 1-X]Mo[subscript X]O[subscript 4]) is developed that has a larger band gap energy than the usual yellow scheelite monoclinic BiVO[subscript 4] as well as a higher (more negative) conduction band than H[superscript +]/H[subscript 2] potential [0 VRHE (reversible hydrogen electrode) at pH 7]. Hence, it can extract H[subscript 2] from pure water by visible light-driven overall water splitting without using any sacrificial reagents. The density functional theory calculation indicates that In[superscript 3+]/Mo[superscript 6+] dual doping triggers partial phase transformation from pure monoclinic BiVO[subscript 4] to a mixture of monoclinic BiVO[subscript 4] and tetragonal BiVO[subscript 4], which sequentially leads to unit cell volume growth, compressive lattice strain increase, conduction band edge uplift, and band gap widening. |
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