共 27 条
Hierarchical Cu2O photocathodes with nano/microspheres for solar hydrogen generation
被引:54
作者:
Hsu, Yu-Kuei
[1
]
Yu, Chun-Hao
[1
]
Chen, Ying-Chu
[2
]
Lin, Yan-Gu
[3
]
机构:
[1] Natl Dong Hwa Univ, Dept Optoelect Engn, Hualien, Taiwan
[2] Natl Taiwan Univ, Dept Chem Engn, Taipei 106, Taiwan
[3] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
来源:
RSC ADVANCES
|
2012年
/
2卷
/
32期
关键词:
PHOTOELECTROCHEMICAL ACTIVITY;
THIN-FILMS;
WATER;
CUO;
COMPOSITE;
FABRICATION;
REDUCTION;
D O I:
10.1039/c2ra21979d
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
A hierarchical p-type Cu2O film with nano/microspheres on copper foil is successfully synthesized via a facile and cost-effective liquid reduction route through transformation of a lotus-like CuO/Cu(OH)(2) nanosheet/nanowire structure. Various sizes of sphere-like Cu2O are transformed from CuO nanosheets and Cu(OH)(2) nanowires by chemically reducing the oxides from Cu2+ to Cu1+ in a solution of ascorbic acid at a low temperature of 60 degrees C. Mott-Schottky analysis shows the flat band potential of the sphere-like Cu2O film to be -0.11 V and an acceptor concentration of 2.7 x 10(20) cm(-3). A direct band gap of 2.02 eV in Cu2O film is determined by incident photon-to-electron conversion efficiency measurements. Significantly, this hierarchical Cu2O photocathode exhibits remarkable photoelectrochemical activity in visible light. These results demonstrate that the Cu2O film with nano/microspheres has great potential in solar hydrogen applications.
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页码:12455 / 12459
页数:5
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