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- Title
Potassium‐Ion‐Assisted Regeneration of Active Cyano Groups in Carbon Nitride Nanoribbons: Visible‐Light‐Driven Photocatalytic Nitrogen Reduction.
- Authors
Wang, Weikang; Zhang, Haimin; Zhang, Shengbo; Liu, Yanyan; Wang, Guozhong; Sun, Chenghua; Zhao, Huijun
- Abstract
As a metal‐free nitrogen reduction reaction (NRR) photocatalyst, g‐C3N4 is available from a scalable synthesis at low cost. Importantly, it can be readily functionalized to enhance photocatalytic activities. However, the use of g‐C3N4‐based photocatalysts for the NRR has been questioned because of the elusive mechanism and the involvement of N defects. This work reports the synthesis of a g‐C3N4 photocatalyst modified with cyano groups and intercalated K+ (mCNN), possessing extended visible‐light harvesting capacity and superior photocatalytic NRR activity (NH3 yield: 3.42 mmol g−1 h−1). Experimental and theoretical studies suggest that the ‐C≡N in mCNN can be regenerated through a pathway analogous to Mars van Krevelen process with the aid of the intercalated K+. The results confirm that the regeneration of the cyano group not only enhances photocatalytic activity and sustains the catalytic cycle, but also stabilizes the photocatalyst.
- Subjects
CYANO group; PHOTOREDUCTION; NITRIDES; NANORIBBONS; CATALYTIC activity; PHOTOCATALYSTS
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 46, p16797
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201908640