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Tailoring Heteroatoms in Conjugated Microporous Polymers for Boosting Oxygen Electrochemical Reduction to Hydrogen Peroxide by Zhongjie Yang; Yang Gao; Lulu Zuo; Chang Long; Caoyu Yang; Xiaofei Zhang is a Chemistry article available to read on EtoBox.

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Heteroatom-doped metal-free carbon materials have been considered as efficient catalysts for electrochemical H 2 O 2 production via the two-electron oxygen reduction reaction (2e − -ORR). However, it is difficult to construct the precise heteroatom-doped carbon materials driving the 2e − -ORR process through the conventional pyrolytic method. Reported here is a diatomic hetero-cyclization strategy to construct efficient 2e − -ORR catalysts based on poly-benzimidazole, polybenzoxazole, and poly-benzothiazole (PBXs, X = I, O, and T), which are composed of N-NH-, N-O-, or N-S-heterocycles, respectively. Poly-benzothiazole (PBT) with N, S-doped heterocyclic rings exhibit a higher H 2 O 2 selectivity (95.6%) over corresponding undoped imine-based polymers (21.7%) and maintain remarkable electrochemical durability, which are among the highest values for PBXs as 2e − -ORR catalysts. A maximum H 2 O 2 production rate of 3.13 mol g catalyst −1 h −1 is obtained at a fixed current density of 100 mA cm −2 . Moreover, a remarkable Faradaic efficiency (F.E.) of 96% as well as good catalyst stability maintained over 50 h of testing over the PBT catalyst in the three-phase flow cell is achieved. D

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Author

Zhongjie Yang; Yang Gao; Lulu Zuo; Chang Long; Caoyu Yang; Xiaofei Zhang

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)