此外,引入空间分离双助催化剂促进载流子的分离,是目前人们采用的另一种能够有效提高光电极光电性能的方法,Wang 等人 [1] 在赤铁矿纳米薄片的两侧分别沉积了作为空穴转移层的 FeOOH 以及作为电子收集层和传输层的Pt助催化剂,有效地改善了光生载流子的空间分离,提高了 PEC 水分解性能。[1] Wang L, Yang Y, Zhang Y, Rui Q, Zhang B, Shen Z, Bi Y. Journal ofMaterials Chemistry A, 2017, 5: 17056-17063.
▲Fig. 1 Top-view and magnifying SEM images of (a) Pt/ZnO and (b) Pt/ZnO/Co-Pi. (c) Cross-section SEM image and (d) XRD spectrum of Pt/ZnO/Co-Pi photoanode
▲Fig. 2 (a) TEM image of Pt/ZnO/Co-Pi photoanode. (b, d) Magnifying TEM images of the areas selected in (a). (c, e) HRTEM images on ZnO/Co-Pi and Pt/ZnO interfaces
▲Fig. 3 (a) Current density-voltage (I-V) measured in 0.1 M Na2SO4 with 0.1 M potassium phosphate electrolyte, top inset: amplifying I-V plots with the potential from 0.25 to 0.55 V. (b) Applied bias photon-to-current efficiency (ABPE). (c) I-V and (d) current density-time (I-T) curves of ZnO measured with different ultrasonic vibration frequencies in dark. (e) I-T curves of ZnO, ZnO+U (ultrasonic vibrations) and Pt/ZnO/Co-Pi+U. (f) Schematic diagram of piezoelectric effect produced by ultrasonic vibrations
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