极化子
钝化
钒酸铋
兴奋剂
分解水
材料科学
光电子学
化学物理
纳米技术
化学
物理
光催化
催化作用
电子
量子力学
生物化学
图层(电子)
作者
Hao Wu,Lei Zhang,Aijun Du,Rowshanak Irani,Roel van de Krol,Fatwa F. Abdi,Yun Hau Ng
标识
DOI:10.1038/s41467-022-33905-6
摘要
Metal oxides are promising for photoelectrochemical (PEC) water splitting due to their robustness and low cost. However, poor charge carrier transport impedes their activity, particularly at low-bias voltage. Here we demonstrate the unusual effectiveness of phosphorus doping into bismuth vanadate (BiVO4) photoanode for efficient low-bias PEC water splitting. The resulting BiVO4 photoanode shows a separation efficiency of 80% and 99% at potentials as low as 0.6 and 1.0 VRHE, respectively. Theoretical simulation and experimental analysis collectively verify that the record performance originates from the unique phosphorus-doped BiVO4 configuration with concurrently mediated carrier density, trap states, and small polaron hopping. With NiFeOx cocatalyst, the BiVO4 photoanode achieves an applied bias photon-to-current efficiency of 2.21% at 0.6 VRHE. The mechanistic understanding of the enhancement of BiVO4 properties provides key insights in trap state passivation and polaron hopping for most photoactive metal oxides.
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