| 苏泽源,赵雨,朱燕艳.含氧空位缺陷钨酸铋光催化产氢性能研究[J].分子催化,2024,38(2):154-159 |
| 含氧空位缺陷钨酸铋光催化产氢性能研究 |
| Photocatalytic Hydrogen Production Performance of Oxygen-containing Vacancy-deficient Bismuth Tungstate |
| 投稿时间：2023-12-18 修订日期：2024-03-03 |
| DOI：10.16084/j.issn1001-3555.2024.02.008 |
| 中文关键词: 光催化 钨酸铋 氧空位 表面缺陷 产氢 |
| 英文关键词:photocatalysis bismuth tungstate oxygen vacancies surface defects hydrogen production |
| 基金项目:国家自然科学基金(No. 22236005)( National Natural Science Foundation of China (No. 22236005)). |
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| 中文摘要: |
| 新型半导体光催化剂钨酸铋是目前研究广泛的光催化剂, 但因其存在电子-空穴对易复合的问题, 使得光催化产氢性能受到限制. 为解决这一问题, 我们采用锂-乙二胺溶液在钨酸铋表面构筑可控氧空位缺陷. 通过材料表征对比了钨酸铋经锂-乙二胺处理前后的变化, 并进行产氢性能测试. 结果表明: 钨酸铋在经过锂-乙二胺处理后产生了氧空位缺陷, 材料颜色从原先的黄白色转变为黄棕色, 增强了光吸收能力. 颗粒的主体结构以及物质成分并未发生变化, 仍保持花球状颗粒结构, 但处理后钨酸铋颗粒表面原先的光滑的片状结构变得粗糙, 且方形纳米薄片锋利边缘变光滑, 提高了光催化反应面积. 这些变化使锂-乙二胺处理后的钨酸铋光催化产氢性能相比未处理之前得到了一定的提升, 其中处理时间为2 min的钨酸铋的平均产氢速率最高, 达到21 μmol·g-1·h-1. 相较未处理的钨酸铋平均产氢速率15 μmol·g-1·h-1提升了40%, 具有更优的光催化制氢性能. |
| 英文摘要: |
| The novel semiconductor photocatalyst bismuth tungstate is a widely researched photocatalyst, but its photocatalytic hydrogen-producing performance is limited by the problem that its electron-hole pairs are easy to be compounded. To solve this problem, lithium-ethylenediamine solution was used to construct controllable oxygen vacancy defects on the surface of bismuth tungstate. The changes of bismuth tungstate before and after lithium-ethylenediamine treatment were compared by material characterization, and both were tested for hydrogen production performance. Bismuth tungstate produced oxygen vacancy defects after lithium-ethylenediamine treatment, and the color of the material changed from the original yellowish-white to yellowish-brown, which enhanced the light-absorbing ability. The main structure of the particles and the composition of the material did not change, and the spherical particle structure was still maintained, but the original smooth lamellar structure on the surface of the bismuth tungstate particles became rough after the treatment, and the sharp edges of the square nanosheets became smooth, which improved the photocatalytic reaction area. These changes resulted in a certain enhancement of the photocatalytic hydrogen production performance of lithium-ethylenediamine-treated bismuth tungstate compared with that before the untreated treatment, in which the bismuth tungstate with a treatment time of 2 min showed the highest average hydrogen production rate of 21 μmol·g-1·h-1. Compared with the untreated bismuth tungstate, the average hydrogen production rate of 15 μmol·g-1·h-1 was improved by 40%, which has better photocatalytic hydrogen production performance. |
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