Different performances of Ni3(PO4)2 in TiO2 photocatalysis under aerobic and anaerobic conditions,Catalysis Science & Technology

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Different performances of Ni3(PO4)2 in TiO2 photocatalysis under aerobic and anaerobic conditions
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020/01/21 , DOI: 10.1039/c9cy02350j
Yaru Wang _{1,

2,

3,

4} , Jianjun Zhao _{1,

2,

3,

4} , Chen Chen _{1,

2,

3,

4} , Yiming Xu _{1,

2,

3,

4}

Affiliation

It has been reported that cobalt phosphate (CoP) deposited on TiO₂ is beneficial to the photoelectrochemical (PEC) oxidation of water in a phosphate solution, but detrimental to the photocatalytic (PC) oxidation of phenol even in a phosphate solution. Herein, we report amorphous nickel phosphate (NiP) deposited on TiO₂ being more active than TiO₂ in a phosphate-free solution. This was observed not only from the PEC oxidation of water, but also from the PC oxidation of phenol under air, and from the PC reduction of water to H₂ under N₂ in the presence of methanol, respectively. During the PC reactions under air and N₂, however, the suspension of NiP/TiO₂ changed its colour from white to pale yellow and dark grey, respectively. Such colour changes were also observed from CoP/TiO₂ under similar conditions. Through a spectral and thermodynamic analysis, it is proposed that under air, NiP is oxidized to a high valence Ni species, and then regenerated through water and phenol oxidation, while NiP under N₂ is reduced to metallic Ni, followed by proton reduction.

中文翻译：

好氧和厌氧条件下Ni3（PO4）2在TiO2光催化中的不同性能

据报道，沉积在TiO ₂上的磷酸钴（CoP）有利于磷酸盐溶液中水的光电化学（PEC）氧化，但即使在磷酸盐溶液中也有害于苯酚的光催化（PC）氧化。在此，我们报道了在无磷酸盐溶液中沉积在TiO ₂上的非晶态磷酸镍（NiP）比TiO ₂更具活性。不仅从水的PEC氧化，而且在空气中苯酚的PC氧化，以及在甲醇存在下在N ₂下将水PC还原成H ₂，都可以观察到这一点。但是，在空气和N ₂下PC反应期间，NiP / TiO ₂悬浮液将其颜色分别从白色变为浅黄色和深灰色。在相似条件下，从CoP / TiO ₂也观察到了这种颜色变化。通过光谱和热力学分析，提出在空气中，NiP被氧化成高价态的Ni，然后通过水和苯酚氧化而再生，而在N ₂下，NiP被还原成金属Ni，然后进行质子还原。

更新日期：2020-03-26

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