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Conjugated Microporous Polymer Nanosheets for Overall Water Splitting Using Visible Light
Author(s) -
Wang Lei,
Wan Yangyang,
Ding Yanjun,
Wu Sikai,
Zhang Ying,
Zhang Xinlei,
Zhang Guoqing,
Xiong Yujie,
Wu Xiaojun,
Yang Jinlong,
Xu Hangxun
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201702428
Subject(s) - conjugated microporous polymer , materials science , water splitting , photocatalysis , polymer , conjugated system , visible spectrum , photochemistry , microporous material , photocatalytic water splitting , chemical engineering , nanotechnology , optoelectronics , organic chemistry , catalysis , chemistry , engineering , composite material
Direct water splitting into H 2 and O 2 using photocatalysts by harnessing sunlight is very appealing to produce storable chemical fuels. Conjugated polymers, which have tunable molecular structures and optoelectronic properties, are promising alternatives to inorganic semiconductors for water splitting. Unfortunately, conjugated polymers that are able to efficiently split pure water under visible light (400 nm) via a four‐electron pathway have not been previously reported. This study demonstrates that 1,3‐diyne‐linked conjugated microporous polymer nanosheets (CMPNs) prepared by oxidative coupling of terminal alkynes such as 1,3,5‐tris‐(4‐ethynylphenyl)‐benzene (TEPB) and 1,3,5‐triethynylbenzene (TEB) can act as highly efficient photocatalysts for splitting pure water (pH ≈ 7) into stoichiometric amounts of H 2 and O 2 under visible light. The apparent quantum efficiencies at 420 nm are 10.3% and 7.6% for CMPNs synthesized from TEPB and TEB, respectively; the measured solar‐to‐hydrogen conversion efficiency using the full solar spectrum can reach 0.6%, surpassing photosynthetic plants in converting solar energy to biomass (globally average ≈0.10%). First‐principles calculations reveal that photocatalytic H 2 and O 2 evolution reactions are energetically feasible for CMPNs under visible light irradiation. The findings suggest that organic polymers hold great potential for stable and scalable solar‐fuel generation.