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A Cobalt@Cucurbit[5]uril Complex as a Highly Efficient Supramolecular Catalyst for Electrochemical and Photoelectrochemical Water Splitting
Author(s) -
Li Fusheng,
Yang Hao,
Zhuo Qiming,
Zhou Dinghua,
Wu Xiujuan,
Zhang PeiLi,
Yao Zhaoyang,
Sun Licheng
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011069
Subject(s) - overpotential , catalysis , electrochemistry , photocurrent , supramolecular chemistry , water splitting , indium tin oxide , chemistry , materials science , electrolyte , chemical engineering , inorganic chemistry , electrode , crystallography , organic chemistry , crystal structure , photocatalysis , optoelectronics , engineering
Abstract A host–guest complex self‐assembled through Co 2+ and cucurbit[5]uril (Co@CB[5]) is used as a supramolecular catalyst on the surface of metal oxides including porous indium tin oxide (ITO) and porous BiVO 4 for efficient electrochemical and photoelectrochemical water oxidation. When immobilized on ITO, Co@CB[5] exhibited a turnover frequency (TOF) of 9.9 s −1 at overpotential η =550 mV in a pH 9.2 borate buffer. Meanwhile, when Co@CB[5] complex was immobilized onto the surface of BiVO 4 semiconductor, the assembled Co@CB[5]/BiVO 4 photoanode exhibited a low onset potential of 0.15 V (vs. RHE) and a high photocurrent of 4.8 mA cm −2 at 1.23 V (vs. RHE) under 100 mW cm −2 (AM 1.5) light illumination. Kinetic studies confirmed that Co@CB[5] acts as a supramolecular water oxidation catalyst, and can effectively accelerate interfacial charge transfer between BiVO 4 and electrolyte. Surface charge recombination of BiVO 4 can be also significantly suppressed by Co@CB[5].