定向转化策略创制氮氧化物光催化剂
收稿日期: 2021-12-09
网络出版日期: 2022-03-18
基金资助
国家自然科学基金项目(22072094);国家自然科学基金项目(51832007)
Preparation of oxynitrides photocatalysts by the oriented transformation strategy
Received date: 2021-12-09
Online published: 2022-03-18
太阳能高效转化与利用是解决能源和环境两大问题的理想途径,而提高窄禁带半导体的光催化活性是有效利用太阳能资源的重要策略。其中,氮氧化物在可见光区有较强的吸收,被认为是一种潜在的可见光区光催化材料。当前,氮氧化物主要通过热氮化获得,即氨气在1 173~1 373 K条件下持续通过氧化物10 h以上。由此制备的氮氧化物往往只暴露低活性晶面,且生成的大量还原态缺陷可作为光生电荷的复合中心,严重制约了其在光催化领域的广泛应用。为此,总结了一种定向转化策略创制高质量氮氧化物光催化材料。该策略通过选取含挥发组分的氧化物前驱体实现对氮氧化物缺陷和晶面的有效调控,为其在太阳能光催化领域中的广泛应用奠定基础。同时,此定向转化策略可拓展到其他材料体系,为开发高效光催化剂提供新思路。
王鑫 , 薛冬峰 . 定向转化策略创制氮氧化物光催化剂[J]. 无机盐工业, 2022 , 54(3) : 1 -6 . DOI: 10.19964/j.issn.1006-4990.2021-0743
The efficient conversion and utilization of solar energy is an ideal way to solve the two major problems of energy and environment.Improving the photocatalytic activity of narrow bandgap oxynitrides is of significant importance as the means of realizing efficient visible-light-driven water splitting for solar energy.Among the various photocatalysts,oxynitrides have strong absorption in the visible region,which are considered to be potential photocatalytic materials in the visible region.Cur-rently,oxynitrides are mainly obtained by thermal nitridation,which mainly involves the continuous passage of ammonia gas through the oxides for more than 10 h under the condition of 1 173~1 373 K.The prepared oxynitrides only expose low-active crystal facets,and a large number of reduced defects can be used as the recombination center of photogenerated charges,which seriously restricts their wide application in the field of photocatalysis.In this case,a novel oriented transformation strat-egy to create high-quality oxynitrides was summarized.This strategy achieved effective control of oxynitrides defects and crys-tal facets by selecting oxide precursors containing volatile components,laying the foundation for its wide application in the field of solar photocatalysis.At the same time,this oriented transformation strategy could be extended to other material sys-tems,providing new ideas for the development of high-efficiency photocatalysis.
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