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A Cobalt@Cucurbit[5]uril Complex as a Highly Efficient Supramolecular Catalyst for Electrochemical and Photoelectrochemical Water Splitting
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-10-13 , DOI: 10.1002/anie.202011069 Fusheng Li 1 , Hao Yang 2 , Qiming Zhuo 1 , Dinghua Zhou 1 , Xiujuan Wu 1 , PeiLi Zhang 1 , Zhaoyang Yao 2 , Licheng Sun 1, 2, 3
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-10-13 , DOI: 10.1002/anie.202011069 Fusheng Li 1 , Hao Yang 2 , Qiming Zhuo 1 , Dinghua Zhou 1 , Xiujuan Wu 1 , PeiLi Zhang 1 , Zhaoyang Yao 2 , Licheng Sun 1, 2, 3
Affiliation
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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 η=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].
中文翻译：
钴@Cucurbit[5]uril配合物作为电化学和光电化学水分解的高效超分子催化剂
通过Co 2+和葫芦[5]尿素自组装的主客体复合物（Co@CB[5]）用作金属氧化物（包括多孔氧化铟锡（ITO）和多孔BiVO 4 ）表面的超分子催化剂用于有效的电化学和光电化学水氧化。当固定在 ITO 上时，Co@CB[5] 在 pH 9.2 硼酸盐缓冲液中，过电势η = 550 mV 时表现出 9.9 s -1的周转频率 (TOF)。同时，当Co@CB[5]复合物固定在BiVO 4半导体表面时，组装的Co@CB[5]/BiVO 4光阳极表现出0.15 V（vs. RHE）的低起始电位和100 mW cm -2 (AM 1.5) 光照下，1.23 V（相对于 RHE）为 4.8 mA cm -2 。动力学研究证实Co@CB[5]作为超分子水氧化催化剂，可以有效加速BiVO 4与电解质之间的界面电荷转移。 Co@CB也可以显着抑制BiVO 4的表面电荷复合[5]。
更新日期：2020-10-13
中文翻译：
钴@Cucurbit[5]uril配合物作为电化学和光电化学水分解的高效超分子催化剂
通过Co 2+和葫芦[5]尿素自组装的主客体复合物（Co@CB[5]）用作金属氧化物（包括多孔氧化铟锡（ITO）和多孔BiVO 4 ）表面的超分子催化剂用于有效的电化学和光电化学水氧化。当固定在 ITO 上时，Co@CB[5] 在 pH 9.2 硼酸盐缓冲液中，过电势η = 550 mV 时表现出 9.9 s -1的周转频率 (TOF)。同时，当Co@CB[5]复合物固定在BiVO 4半导体表面时，组装的Co@CB[5]/BiVO 4光阳极表现出0.15 V（vs. RHE）的低起始电位和100 mW cm -2 (AM 1.5) 光照下，1.23 V（相对于 RHE）为 4.8 mA cm -2 。动力学研究证实Co@CB[5]作为超分子水氧化催化剂，可以有效加速BiVO 4与电解质之间的界面电荷转移。 Co@CB也可以显着抑制BiVO 4的表面电荷复合[5]。
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