Preparation and photoelectrochemical properties of WO3/Bi2MoO6 composite films
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摘要: WO3材料在光电催化方面的应用备受关注，但其光生电子空穴有效分离能力差，对太阳光的利用率较低等问题，限制了其光电催化性能。为了解决这个问题，先用水热法在导电玻璃(FTO)上制备WO3纳米薄膜，然后使用溶剂热法在WO3纳米薄膜上制备不同反应时长(7 h、9 h和11 h)的WO3/Bi2MoO6复合薄膜。通过XRD和SEM测试，证明了WO3/Bi2MoO6复合薄膜的成功制备。对WO3/Bi2MoO6复合薄膜样品进行吸收光谱测试、光电流测试、光电催化测试和交流阻抗测试。结果表明：WO3/Bi2MoO6复合薄膜样品相较于单一WO3纳米薄膜，具有更好的光吸收特性、更优秀的光电流特性和显著提升的光电催化活性。且水热反应9 h的WO3/Bi2MoO6复合薄膜样品具有最高的光电流密度和最优的光电催化效率。分析认为，WO3/Bi2MoO6复合薄膜可能构成了异质结结构，降低了复合薄膜内部的电子阻抗，并且增加了有效的光电化学反应位点；同时通过提高太阳光利用率使光谱的响应范围得到拓展。因此光电化学性能显著提高。Abstract: The application of WO3 materials has been attracted much attention in photoelectric catalysis, but its poor photo-generated electron hole separation ability and low utilization rate of sunlight have limited its photoelectric catalytic property. To solve this problem, WO3 nano-films were prepared on the conductive glass (FTO) by hydrothermal method, and WO3/Bi2MoO6 composite films with different reaction time (7 h, 9 h and 11 h) were synthesized on WO3 nano-films by solvothermal method. XRD and SEM tests proved the successful preparation of WO3/Bi2MoO6 composite films. The WO3/Bi2MoO6 composite film samples were subjected to absorption spectrum test, photocurrent test, photoelectric catalytic test and alternating current impedance test. The results show that the WO3/Bi2MoO6 composite film samples have better light absorption characteristics, more outstanding photocurrent characteristics and significantly improved photoelectrocatalysis activity compared with pure WO3 nano-films. And the WO3/Bi2MoO6 composite film samples with the hydrothermal reaction for 9 h have the highest photocurrent density and the best photoelectrocatalysis efficiency. The analysis suggests that the WO3/Bi2MoO6 composite film may constitute a heterojunction structure, which reduces the electronic impedance inside the composite film and increases the effective photoelectrochemical reaction sites; Meanwhile, the response range of the spectrum is expanded by increasing the utilization rate of sunlight. So the photoelectrochemical property can be significantly improved.
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Key words:
- WO3 /
- Bi2MoO6 /
- laminated film /
- photoelectrochemistry /
- photoelectrocatalysis /
- photocurrent
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图 1 WO3薄膜和WO3/Bi2MoO6复合薄膜的XRD图谱
Figure 1. XRD pattarns of WO3 film and WO3/Bi2MoO6 composite film
FTO—Conductive glass
图 2 WO3纳米片薄膜与WO3/Bi2MoO6复合薄膜表面和截面的SEM图像：WO3纳米片薄膜的表面 (a) 和截面(e)；WO3/Bi2MoO6-(7、9、11 h)复合薄膜的表面 ((b)~(d)) 和截面 ((f)~(h))
Figure 2. SEM images of surface and cross section of WO3 nanosheet films and WO3/Bi2MoO6 composite films: Surface (a) and cross section (e) of WO3 nanosheets film; Surface ((b)-(d)) and cross section ((f)-(h)) of WO3/Bi2MoO6-(7, 9, 11 h) composite films
图 3 WO3纳米片薄膜与WO3/Bi2MoO6复合薄膜的归一化吸收光谱(a)和带隙图(b)
Figure 3. Normalized absorption spectra (a) and band gap diagram (b) of WO3 nanosheets film and WO3/Bi2MoO6-9 h composite films
图 4 WO3纳米片薄膜与WO3/Bi2MoO6复合薄膜的光电流 (a) 和光电催化结果 (b)
Figure 4. Photocurrent (a) and photoelectrocatalytic results (b) of WO3 nanosheets and WO3/Bi2MoO6 composite films
C—Concentration of methylene blue at different catalytic degradation times; C0—Initial concentration of methylene blue; C/C0—Catalytic degradation efficiency
图 5 WO3/Bi2MoO6-9 h复合薄膜3次光电催化(PEC)稳定性测试曲线
Figure 5. Photoelectrocatalytic (PEC) stability test curves of WO3/Bi2MoO6 composite film after solvothermal treatment for 9 h
图 6 WO3/Bi2MoO6-9 h复合薄膜的光电催化(PEC)、光催化(PC)和电催化(EC)性能测试
Figure 6. Photoelectrocatalytic (PEC), photocatalytic (PC) and electrocatalytic (EC) properties of WO3/Bi2MoO6-9 h
图 7 WO3纳米片薄膜、WO3/Bi2MoO6复合薄膜溶剂热反应时长7 h、9 h和11 h样品的交流阻抗图
Figure 7. AC impedance diagram of WO3 nanosheet films and WO3/Bi2MoO6 composite films with solvothermal reaction time of 7 h, 9 h and 11 h
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