Graphene Acting as Surface Phase Junction in Anatase鈥揋raphene鈥揜utile Heterojunction Photocatalysts for H2 Production from Water Splitting

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• 作者：Yan Yan ; Chao Wang ; Xu Yan ; Lisong Xiao ; Jianghua He ; Wei Gu ; Weidong Shi
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：118
• 期：41
• 页码：23519-23526
• 全文大小：611K
• ISSN：1932-7455

文摘

The construction of heterojunction photocatalysts has received much attention in the field of photocatalytic H₂ production from water splitting. The surface phase junction of semiconductors is very important to the activity of heterojunction photocatalysts. In this study, an effective anatase鈥揼raphene鈥搑utile heterojunction structure was designed and fabricated by using graphene as the surface phase junction between anatase and rutile particles. Results show that both the anatase/rutile ratio (A/R ratio) and graphene amount represent important influence on H₂ production activities of anatase鈥揼raphene鈥搑utile heterojunction photocatalysts. Under our experimental condition, the optimum A/R ratio is 7/3 and graphene addition amount is 2 wt %, the corresponding AR7/3鈥?%G sample has the highest H₂ production rate of 1.714 mmol/h. By further experimental study, we think the high H₂ production activity of anatase鈥揼raphene鈥搑utile heterojunction photocatalyst is from the enhanced charge separation rather than other effect. This work values the expanding of surface phase junction and provides a feasible strategy to develop high-performance photocatalysts by designing and expanding the surface phase junction.