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Anchoring Active Pt 2+ /Pt 0 Hybrid Nanodots on g‐C 3 N 4 Nitrogen Vacancies for Photocatalytic H 2 Evolution
Author(s) -
Xing Weinan,
Tu Wenguang,
Ou Man,
Wu Shuyang,
Yin Shengming,
Wang Haojing,
Chen Gang,
Xu Rong
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201801431
Subject(s) - nanodot , photocatalysis , catalysis , materials science , graphitic carbon nitride , platinum , metal , nitrogen , electron transfer , photochemistry , nanotechnology , chemistry , metallurgy , organic chemistry
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‐C 3 N 4 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‐C 3 N 4 results in superior photocatalytic H 2 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‐C 3 N 4 ‐based photocatalysts with Pt co‐catalyst reported previously. The excellent photocatalytic H 2 evolution performance is a result of i) metallic Pt 0 facilitating the electron transport and separation and Pt 2+ species preventing the undesirable H 2 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 H 2 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.