Volume 18, Issue 3 2105524
Research Article

Oxygen Reduction Activity of B←N-Containing Organic Molecule Affected by Asymmetric Regulation

Meilong Wang

Meilong Wang

State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China

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Bingbing Wang

Bingbing Wang

State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China

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Weichen Song

Weichen Song

State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China

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Xuchao Wang

Xuchao Wang

Department of Environmental and Chemical Engineering, Tangshan University, Tangshan, 063000 P. R. China

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Xudong Peng

Xudong Peng

Department of Ophthalmology, University of Washington, 325 Ninth Ave, Box 359607, Seattle, WA, 98104 USA

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Xiaojing Long

Corresponding Author

Xiaojing Long

State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China

E-mail: [email protected]

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Yanzhi Xia

Yanzhi Xia

State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Shandong Marine Biobased Fibers and Ecological Textiles, Institute of Marine Biobased Materials, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071 P. R. China

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First published: 27 November 2021
Citations: 9

Abstract

Organic molecular catalysts have received great attention as they have the merits of well-controlled molecular structures for the development of catalytic chemistry. Herein, the electronic distribution of active sites is regulated by asymmetrically introducing S-heterocycle on one side of the molecular core. As a result, the asymmetric as-PYT and as-BNT show higher oxygen reduction performance than their symmetric counterparts without (s-PY, s-PY2T) or with two S-heterocycle units (s-BN, s-BN2T). Density functional theory calculations reveal that the carbon atoms (site–12) at symmetric s-BN and s-BN2T are the catalytic active sites, while for asymmetric as-BNT, it has changed to amino-N atom (site-14). Due to the non-uniform charge distribution and increased dipole moment of as-BNT caused by asymmetric molecular configuration, the kinetics of catalytic reaction has changed significantly. The catalytically active sites of specific N atoms are further verified experimentally and theoretically by using sterically hindered phenyl groups. This work provides a simple but efficient method to design metal-free oxygen reduction electrocatalysts.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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