期刊
NANO ENERGY
卷 79, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105485
关键词
NaNbO3; Pyroelectric effect; Photoelectrochemical; Pyro-photo-electric catalysis
类别
资金
- National Natural Science Foundation of China [52073200]
- Science Funds Tianjin for Distinguished Young Scholar [17JCJQJC44800]
- Key Research and Development Plan of Tianjin [19YFSLQY00020]
A novel catalytic process named pyro-photo-electric catalysis is successfully realized by combining pyroelectric catalysis and photoelectrochemical catalysis based on NaNbO3 nanocubes. The study shows that the enhanced photocurrent density can be attributed to the increased carrier concentration and accelerated charge separation and transfer due to changes in the band alignment at the NaNbO3/electrolyte interface.
Herein, a novel catalytic process named pyro-photo-electric catalysis is firstly realized by combining pyroelectric catalysis (PREC) and photoelectrochemical (PEC) catalysis based on NaNbO3 nanocubes. The films show enhanced photocurrent density of 0.37 mA/cm(2) at 1.23 V vs. a reversible hydrogen electrode (RHE) under 20-50 degrees C heating-cooling cycles and illumination, which is 3.1 and 1.6 times higher than that of PREC (0.09 mA/ cm(2)) and PEC catalysis (0.14 mA/cm(2)). It is found that the higher catalysis efficiency can be the result of increased carrier concentration, including photogenerated carriers and pyro-generated carriers, and accelerated charge separation and transfer due to the change in band alignment at NaNbO3/electrolyte caused by the imbalance of polarization charges and the induced pyroelectric potential. This study confirms the feasibility of pyroelectric-assisted PEC performance and realizes the energy harvesting of cold-hot alternation thermal energy and solar energy. It also provides insights into the rational design for designing new and ecofriendly photo-electrodes with efficient PEC water splitting.
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