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A Cobalt@Cucurbit[5]uril Complex as a Highly Efficient Supramolecular Catalyst for Electrochemical and Photoelectrochemical Water Splitting.


ABSTRACT: A host-guest complex self-assembled through Co2+ 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 BiVO4 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 ?=550?mV in a pH?9.2 borate buffer. Meanwhile, when Co@CB[5] complex was immobilized onto the surface of BiVO4 semiconductor, the assembled Co@CB[5]/BiVO4 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 BiVO4 and electrolyte. Surface charge recombination of BiVO4 can be also significantly suppressed by Co@CB[5].

SUBMITTER: Li F 

PROVIDER: S-EPMC7894348 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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A Cobalt@Cucurbit[5]uril Complex as a Highly Efficient Supramolecular Catalyst for Electrochemical and Photoelectrochemical Water Splitting.

Li Fusheng F   Yang Hao H   Zhuo Qiming Q   Zhou Dinghua D   Wu Xiujuan X   Zhang PeiLi P   Yao Zhaoyang Z   Sun Licheng L  

Angewandte Chemie (International ed. in English) 20201124 4


A host-guest complex self-assembled through Co<sup>2+</sup> 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<sub>4</sub> for efficient electrochemical and photoelectrochemical water oxidation. When immobilized on ITO, Co@CB[5] exhibited a turnover frequency (TOF) of 9.9 s<sup>-1</sup> at overpotential η=550 mV in a pH 9.2 borate buffer. Meanwhile, when Co@CB[5] complex was immobilized onto t  ...[more]

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