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首页> 外文期刊>RSC Advances >Highly efficient hamburger-like nanostructure of a triadic Ag/Co3O4/BiVO4 photoanode for enhanced photoelectrochemical water oxidation
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Highly efficient hamburger-like nanostructure of a triadic Ag/Co3O4/BiVO4 photoanode for enhanced photoelectrochemical water oxidation

机译：用于增强的光电化学水氧化的三元AG / CO3O4 / BIVO4光电极的高效汉堡纳米结构

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The combination of a semiconductor heterojunction and oxygen evolution cocatalyst (OEC) is an important strategy to improve photoelectrochemical (PEC) water oxidation. Herein, a novel hamburger-like nanostructure of a triadic photoanode composed of BiVO _(4) nanobulks, Co _(3) O _(4) nanosheets and Ag nanoparticles (NPs), that is, Ag/Co _(3) O _(4) /BiVO _(4) , was designed. In our study, an interlaced 2D ultrathin p-type Co _(3) O _(4) OEC layer was introduced onto n-type BiVO _(4) to form a p–n Co _(3) O _(4) /BiVO _(4) heterojunction with an internal electric field (IEF) in order to facilitate charge transport. Then the modification with Ag NPs can significantly facilitate the separation and transport of photogenerated carriers through the surface plasma resonance (SPR) effect, inhibiting the electron–hole recombination. The resulting Ag/Co _(3) O _(4) /BiVO _(4) photoanodes exhibit largely enhanced PEC water oxidation performance: the photocurrent density of the ternary photoanode reaches up to 1.84 mA cm ~(?2) at 1.23 V vs. RHE, which is 4.60 times higher than that of the pristine BiVO _(4) photoanode. The IPCE value is 2.83 times higher than that of the pristine BiVO _(4) at 400 nm and the onset potential has a significant cathodic shift of 550 mV for the ternary well-constructed photoanode.
机译：半导体异质结和氧气进化助催化剂（OEC）的组合是改善光电化学（PEC）水氧化的重要策略。在此，由双组_（4）纳米杆组成的三元聚料的新型汉堡包纳米结构，CO _（3）O _（4）纳米晶片和Ag纳米颗粒（NPS），即Ag / Co _（3）O. _（4）/ BIVO _（4）设计。在我们的研究中，将相互扫描的2D超薄P型CO _（3）O _（4）OEC层引入N型BIVO _（4）上以形成AP-N CO _（3）O _（4）/ BIVO_（4）异质结具有内部电场（IEF），以便于电荷运输。然后通过AG NPS的改性可以显着促进光生载体通过表面等离子体共振（SPR）效应的分离和传输，抑制电子孔重组。得到的AG / CO _（3）O _（4）/ BIVO _（4）光电码表现出大部分增强的PEC水氧化性能：三元光电码的光电流密度在1.23V下达到1.84 mA cm〜（Δ2）与RHE高于Pristine Bivo _（4）PhotoNode的4.60倍。 IPCE值比400nm的原始BIVO _（4）高2.83倍，发病电位为三元良好的Photo-Dode的550 mV具有显着的阴极偏移。

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