Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2022-01-03 , DOI: 10.1016/j.jtice.2021.104195 Jiaowei Yan 1 , Lei Shi 1 , Fangxiao Wang 2 , Lizhu Yao 1
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Background
Currently, most photocatalysts achieve photocatalytic hydrogen evolution reaction by adding trapping agent, therefore, it is necessary for photocatalysts to achieve photocatalytic hydrogen production under pure water conditions. In this paper, a novel CoP-modified phosphorus-doped MnxCd1-xS (PCOMCS) was synthesized with a significant enhancement of hydrogen production performance in pure water.
Methods
The samples are characterized by XRD, TEM, DRS, PL, LSV, Mott-Schottky, etc.
Results
Research demonstrate that 0.2-PCOMCS has a suitable energy band structure, better separation of photo-induced charges, strong reducibility and low overpotential. When it was applied for splitting pure water to H2, compared with MnxCd1-xS, its hydrogen production rate is increased by approximately 33.48 times, but its steady ability is weak, by measuring the XPS of fresh and used 0.2-PCOMCS, it was found that in the hydrogen production reaction, holes oxidise the CoP and P, decreasing the amount of CoP and the role of phosphorization, resulting that its unstable photocatalytic hydrogen ability from pure water. Then, this phenomenon could be resolved through adding holes trapping agent. Hence, the current work dose not only provide an effective photocatalyst with splitting pure water, but also gives reasonable explanation for inactivating mechanism of photocatalytic hydrogen evolution from pure water.
中文翻译：
CoP改性磷掺杂MnxCd1-xS上纯水光催化析氢的增强和失活机制
背景
目前，大多数光催化剂通过添加捕集剂来实现光催化析氢反应，因此，光催化剂需要在纯水条件下实现光催化产氢。在本文中，合成了一种新型 CoP 改性的磷掺杂 Mn x Cd 1-x S (PCOMCS)，显着提高了纯水中的制氢性能。
方法
样品通过XRD、TEM、DRS、PL、LSV、Mott-Schottky等进行表征。
结果
研究表明0.2-PCOMCS具有合适的能带结构，光生电荷分离性好，还原性强，过电位低。用于将纯水分解为H 2 时，与Mn x Cd 1-x 相比S，其产氢速率提高约33.48倍，但稳定能力较弱，通过对新鲜和使用过的0.2-PCOMCS的XPS测量发现，在产氢反应中，空穴氧化CoP和P，降低CoP 的量和磷化的作用，导致其从纯水中的光催化制氢能力不稳定。然后，可以通过添加空穴捕获剂来解决这种现象。因此，目前的工作量不仅提供了一种有效的分解纯水的光催化剂，而且还为纯水光催化析氢的失活机制提供了合理的解释。
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