کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6452427 | 1417597 | 2017 | 7 صفحه PDF | دانلود رایگان |
- In-situ utilization of electricity generated by PFC for performance improvement.
- PFC exhibited higher current output in ACD mode.
- Lower switch time Ts led to faster RhB decolourization rate.
- The strengthening mechanism of ACD mode on PFC system was analyzed.
How to lower recombination of photogenerated electons and holes for efficient pollutant degradation remains a critical challenge for widespread application of photocatalytic fuel cell (PFC). Herein, a PFC based on in-situ utilization of generated electricity for strengthening pollutant removal efficiency was developed. The system was operated in alternate charging and discharging (ACD) mode using a capacitor-based circuit. With the increase of switch time (Ts) from 1 min to 10 min, the rhodamine B (RhB) decolourization rate decreased from 0.05931 minâ1 to 0.03879 minâ1 with current densities decreasing from 2.58 ± 0.08 A mâ2 to 1.86 ± 0.02 A mâ2, which were 133-223% higher than that obtained in continuous energy harvesting (CEH) mode (0.80 ± 0.02 A mâ2). However, the average power densities increased from 22.2 ± 1.9 mW mâ2 to 110.3 ± 3.7 mW mâ2, which were lower than that in CEH mode (154.0 ± 16.7 mW mâ2). This improvement of current output at the expense of power output was beneficial to minimize the recombination of photogenerated charge carriers and improve RhB decolourization, suggesting the enhancement effect of ACD mode on pollutant degradation compared with CEH mode. This work demonstrates that the electricity produced by PFC could be reused to improve system performance, which also provided a promising avenue of PFC operation for better pollutants removal.
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Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 343, 15 June 2017, Pages 51-57