Saxena Sakshi, Verma Anuradha, Asha Kumari, Biswas Neeraj Kumar, Srivastav Anupam, Satsangi Vibha Rani, Shrivastav Rohit, Dass Sahab
Department of Chemistry, Dayalbagh Educational Institute Dayalbagh Agra 282005 India
Department of Physics and Computer Science, Dayalbagh Educational Institute Dayalbagh Agra 282005 India.
RSC Adv. 2022 Apr 26;12(20):12552-12563. doi: 10.1039/d2ra00900e. eCollection 2022 Apr 22.
n/n/n triple heterojunction photoanodes made up of Zr:W-BiVO, FeO, and ZnFeO metal oxides are fabricated through a simplistic spray pyrolysis method. Use of Zr and W as dopants in BiVO plays an important role as Zr increases the carrier density and W reduces the charge recombination. Further, FeO and ZnFeO serve as a protective layer for Zr:W-BiVO, which augmented the photoelectrochemical performance and achieved a 1.90% conversion efficiency in the triple heterojunction. XRD measurements display the crystalline nature and reduction in particle size due to strain in the sample, UV-vis absorbance shows an extended absorption towards the visible region and the FE-SEM imaging confirms the successful deposition of ZnFeO over BiVO/FeO. By analyzing the band edge position, it was observed that on formation, the triple heterojunction not only suppresses the charge carrier recombination but also utilizes the band edge offset for the water splitting reaction using solar energy.
由Zr:W-BiVO₄、Fe₂O₃和ZnFe₂O₄金属氧化物组成的n/n/n三重异质结光阳极通过一种简单的喷雾热解方法制备而成。在BiVO₄中使用Zr和W作为掺杂剂起着重要作用，因为Zr增加了载流子密度，而W减少了电荷复合。此外，Fe₂O₃和ZnFe₂O₄作为Zr:W-BiVO₄的保护层，增强了光电化学性能，并在三重异质结中实现了1.90%的转换效率。X射线衍射测量显示了样品中由于应变导致的晶体性质和粒径减小，紫外-可见吸收光谱显示对可见光区域的吸收扩展，场发射扫描电子显微镜成像证实了ZnFe₂O₄在BiVO₄/Fe₂O₃上的成功沉积。通过分析能带边缘位置，观察到在形成三重异质结时，不仅抑制了电荷载流子复合，还利用能带边缘偏移通过太阳能进行水分解反应。
