Anchoring Active Pt2+/Pt0 Hybrid Nanodots on g‐C3N4 Nitrogen Vacancies for Photocatalytic H2 Evolution. Issue 9 (21st August 2018)

• Record Type: Journal Article
• Authors: Xing, Weinan; Tu, Wenguang; Ou, Man; Wu, Shuyang; Yin, Shengming; Wang, Haojing; Chen, Gang; Xu, Rong
• Is Part Of: ChemSusChem. Volume 12:Issue 9(2019)
• Page Start: 2029
• Page End: 2034
• Publication Date: 2018-08-21
• Subjects: graphitic carbon nitride -- hydrogen evolution -- nanodots -- photocatalytic -- platinum hybrid; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201801431
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: A Pt 2+ /Pt 0 hybrid nanodot‐modified graphitic carbon nitride (CN) photocatalyst (CNV‐P) was fabricated for the first time using a chemical reduction method, during which nitrogen vacancies in g‐C3 N4 assist to stabilize Pt 2+ species. It is elucidated that the coexistence of metallic Pt 0 and Pt 2+ species in the Pt nanodots loaded on g‐C3 N4 results in superior photocatalytic H2 evolution performance with very low Pt loadings. The turnover frequencies (TOFs) are 265.91 and 116.38 h −1 for CNV‐P‐0.1 (0.1 wt % Pt) and CNV‐P‐0.5 (0.5 wt % Pt), respectively, which are much higher than for other g‐C3 N4 ‐based photocatalysts with Pt co‐catalyst reported previously. The excellent photocatalytic H2 evolution performance is a result of i) metallic Pt 0 facilitating the electron transport and separation and Pt 2+ species preventing the undesirable H2 backward reaction, ii) the strong interfacial contact between Pt 2+ /Pt 0 hybrid nanodots and nitrogen vacancies of CNV facilitating the interfacial electron transfer, and iii) the highly dispersed Pt 2+ /Pt 0 hybrid nanodots exposing more active sites for photocatalytic H2 evolution. Our findings are useful for the design of highly active semiconductor‐based photocatalysts with extremely low precious metal content to reduce the catalyst cost while achieving good activity. Abstract : Low Pt content of 0.1 and 0.5 wt % : A Pt 2+ /Pt 0 hybrid nanodot‐modified g‐C3 N4 photocatalyst (CNV‐P) are fabricated by a chemical reduction method, during which nitrogen vacancies in g‐C3 N4 assist to stabilize the Pt 2+ species. The coexistence of metallic Pt 0 and Pt 2+ species in the Pt nanodots loaded on g‐C3 N4 results in superior photocatalytic H2 evolution with very low Pt loadings.