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An integrating photoanode consisting of BiVO4, rGO and LDH for photoelectrochemical water splitting.

Lixia SunJianhua SunXiaojun YangShouli BaiYongjun FengRuixian LuoDianqing LiAifan Chen
Published in: Dalton transactions (Cambridge, England : 2003) (2019)
The low carrier mobility of BiVO4 is a bottleneck that limits its charge transfer in bulk or on the surface. Herein, reduced graphene oxide (rGO) nanosheets as an effective electron mediator were successfully loaded on BiVO4 and NiFe-layered double hydroxides (NiFe-LDHs) were decorated on BiVO4/rGO heterojunctions by two facile electrodeposition methods to construct a triadic photoanode of BiVO4/rGO/NiFe-LDH for improvement of photoelectrochemical (PEC) water splitting efficiency of BiVO4. This photoanode significantly extends the absorption region of visible light, increases the photocurrent density, exhibits an onset potential with a significant cathodic shift, and enhances photon-to-electron conversion efficiency (IPCE) compared with the pristine BiVO4 photoanode. The enhancement of PEC properties benefits from the formation of p-n heterojunctions between rGO and BiVO4 and the use of NiFe-LDH as a cocatalyst for accelerating the kinetics of oxygen evolution from water.
Keyphrases
  • visible light
  • reduced graphene oxide
  • gold nanoparticles
  • drug delivery
  • quantum dots
  • cancer therapy
  • climate change
  • human health
  • highly efficient