Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 237, Issue -, Pages 742-752Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.06.036
Keywords
Surface band bending; Directional charge separation; Ta3N5CO2 reduction; Photoelectrochemical water splitting
Funding
- National Basic Research Program of China [2013CB632404]
- National Natural Science Foundation of China [51572121, 21603098, 21633004]
- State Key Laboratory of NBC Protection for Civilian [SKLNBC2014-09]
- Natural Science Foundation of Jiangsu Province [BK20151265, BK20151383, BK20150580]
- Fundamental Research Funds for the Central Universities [021314380084, 201314380133]
- Postdoctoral Science Foundation of China [2017M611784]
- program B for outstanding PhD candidate of Nanjing University [201702B084]
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Enhancing the separation and transfer of photogenerated carriers is critical factor for increasing the light to chemical energy conversion efficiencies. Here, we exposed {001} and {010} facets on [100] oriented Ta3N5 cuboid, creating 18.6 times enhancement in photocatalytic reduction of CO2 to CH4 and a 0.42 V-RHE (reference to reversible hydrogen electrode) photocurrent onset potential for photoelectrochemical water splitting. The pronounced photocatalytic performance is mainly attributed to that surface electric field from large surface band bending of the {001} with high work function drives electrons and holes to {010} and {001}, respectively, achieving a spatial charge separation. Differing to a main effect in charge separation and transfer for the traditional junction electric field region at buried heterjunction or homojunction interface, a surface electric field region is a place where charges separate and transfer efficiently and also the place for the catalytic reactions to occur.
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