Details

Autor(en) / Beteiligte

• Li, Yang
• Dai, Xianying
• Bu, Yuyu
• Zhang, Hanzhi
• Liu, Jie
• Yuan, Wenyu
• Guo, Xiaohui
• Ao, Jin‐Ping

Titel

Photoelectrochemical Performance Improving Mechanism: Hybridization Appearing at the Energy Band of BiVO4 Photoanode by Doped Quantum Layers Modification

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2022-05, Vol.18 (21), p.e2200454-n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Wiley Backfiles (~2019)

Beschreibungen/Notizen

• Surface passivation of the photoelectrode by wide bandgap semiconductor quantum layer is an important strategy to improve work stability and surface state inhibition. However, an inevitable energy barrier is generated during the quantum tunneling process of the photocarriers. To overcome this shortage, a tandem photo‐generated hole transfer route is fabricated on BiVO4 photoanode by doped dual‐quantum layers modification, Ni‐ZnO (5 nm) and Rh‐SrTiO3 (≈10 nm). Modulated photoelectrochemical (PEC), Scanning Kelvin Probe (SKP), and DFT calculation method results indicate that a tandem hole ohmic contact route is formed in the photoanode to reduce the quantum tunneling energy barrier, meanwhile, the photon absorption capacity of BiVO4 is improved after doped quantum layers modification. Both a phenomenal attribute to the energy band hybridization between Ni, Rh 3d orbits in quantum layers with BiVO4 photoanode. Then, the modified BiVO4 photoanode achieves the recoded photocurrent density of 6.47 and 5.18 mA cm–2 (Na2SO3 electrolyte, VRHE = 1.23 V) under simulated sun light (100 mW cm–2 AM 1.5 G) by xenon lamp illumination without and with UV composition cutting down to ≈5%, respectively. Generally, this work will highlight a potential application in the fields of PEC water splitting and photovoltaic conversion for various semiconductor nanomaterials. This work develops doped dual‐quantum layers to modify the surface of BiVO4 photoanode. In this system, hybridization appears at the energy band of BiVO4 photoanode by doped dual‐quantum layers modification, inducing photon absorption capacity enhancement and tandem hole ohmic contact route fabrication. Thus, the photoelectrochemical water oxidation performance of the BiVO4 photoanode improves significantly.