Boosting photocatalytic hydrogen production by creating isotype heterojunctions and single-atom active sites in highly-crystallized carbon nitride

• 作者: Shaohua Shen Jie Chen Yiqing Wang Chung-Li Dong Fanqi Meng Qinghua Zhang Yiliang Huangfu Zhi Lin Yu-Cheng Huang Yanrui Li Mingtao Li Lin Gu
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2022,（5）
• 所属期刊栏目: ARTICLES
• 页码范围: 520-528
• 页数: 9页
• 语种: 英文

摘要

Carbon nitride-based photocatalysts hold an enormous potential in producing hydrogen.A strategy to simultaneously create isotype heterojunctions and active sites in highly-crystallized carbon nitride is anticipated to significantly boost the photocatalytic activity,but is yet to be realized.Herein,we find that cobalt salt added in the ionothermal synthesis can promote the phase transition of heptazine-based crys-talline carbon nitride (CCN) to triazine-based poly(triazine imide) (PTI),rendering the creation of single-atom cobalt coordinated isotype CCN/PTI heterojunction.Co-CCN/PTI exhibits an appreciable apparent quantum yield of 20.88％ at 425 nm for photocatalytic hydrogen production with a rate achieving 3538μmol h-1 g-1 (λ ＞ 420 nm),which is 4.8 times that of CCN and 27.6 times that of PTI.The high pho-tocatalytic activity is attributed to the Type Ⅱ isotype highly-crystallized CCN/PTI heterojunction for pro-moting charge carrier migration,and the single-atom Co sites for accelerating surface oxidation reaction.