期刊论文

Building surface defects by doping with transition metal on ultrafine T1O_2 to enhance the photocatalytic H_2 production activity

Ma, Jing-Jun;Li, Shiyou

英文

催化学报

0253-9837

2018

39

3

542-548

10.1016/S1872-2067(18)63044-X

* Corresponding author. E‐mail: lsy ? 甃爃礃球甃㜃猃? 甁com ? Corresponding author. E‐mail: mjjwjpmartin ?sina.com This work was supported by the Double First‐rate Subject‐Food Science and Engineering Program of Hebei Province ( ? ? ? ?SPGC YAo ?un g? T)i,p‐top Talents Plan of Universities and Colleges in Hebei Province of China (BJ 球爃猃礃爃球砂?, and the SFpoeucnifdication for Doctor in Hebei Agriculture Univer‐ sity of China (ZD ? 爃猃礃爃笂?. DO?: 猃?. 猃爃猃?/S 猃? 礃琁球爃|? ht 礂tp:H// 猃w稂wwః.s?cie 甃nc爃ed?ire 瘁ct.coᬀm/ science/journal/ 猃稃礃球球爃砃? J. C | aCthali.n, .Vol. 甃笁 NMo. a 甁rch 球 爃猃?

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Inefficient charge separation and limited light absorption are two critical issues associated with high-efficiency photocatalytic H_2 production using TiO_2. Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity. In this study, surface defects (oxygen vacancies and metal cation replacement defects) were induced with a facile and effective approach by surface doping with low-cost transition metals (Co, Ni, Cu, and Mn) on ultrafine TiO_2. The obtained surface-defective TiO_2 exh...

载流子分离效率低和光吸收范围窄是制约二氧化钛光催化产氢活性的两个关键因素. 研究表明, 一定浓度的表面缺陷既有利于光生载流子传递到表面缺陷位点, 抑制载流子的复合, 又可以扩展光催化剂的光谱吸收范围, 从而提高光催化活性. 本文利用低成本过渡金属(Co, Ni, Cu和Mn)掺杂在超细二氧化钛表面, 构建了表面缺陷(氧空位和金属阳离子取代缺陷). 相对于原始的缺陷很少的二氧化钛, 表面缺陷的二氧化钛活性可以提升3-4倍, 而且可见光产氢速率高达3.4 μmol/h,在365 nm处的表观量子效率达到36.9%, 这些结果都远远高于商业的P25 TiO2. 我们认为, 光催化产氢活性的明显提升可以归结为更快速的电荷分离...