Anthraquinone Covalently Modified Carbon Nanotubes for Efficient and Steady Electrocatalytic H 2 O 2 Generation
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doi: 10.1007/s40242-020-0161-8
Article
Anthraquinone Covalently Modified Carbon Nanotubes for Efficient and Steady Electrocatalytic H2O2 Generation YU Fangyuan1, WANG Kai1, WANG Chuan1, HE Xinxia1, LIAO Yang1,2, ZHAO Shilin2, MAO Hui1,2, LI Xiaoting1* and MA Jun1,2* 1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, P. R. China; 2. Engineering Research Center for Development of Farmland Ecosystem Service Functions, Sichuan Province Institutions of Higher Education, Chengdu 610068, P. R. China Abstract Anthraquinone(AQ) modified carbon materials could be endowed with significantly improved oxygen reduction reaction(ORR) activity. However, the application of these materials in the generation of hydrogen peroxide (H2O2) has been rarely investigated. For this motivation, AQ covalently modified carbon nanotube(AQ-CNT) was purposely synthesized for H2O2 generation. It was found that the cumulative H2O2 concentration reached up to 187.18 mg/(L·h) over AQ(40)-CNT catalyst, nearly 2.0 times higher than that over CNT, and being superior to those over most carbon materials reported. The enhanced activity stemmed from the improved mass transfer efficiency of oxygen and the enhanced electrocatalytic activity. Noteworthily, the AQ(40)-CNT material exhibited satisfactory stability for H2O2 generation, which was ascribed to the strong interaction force of C—N covalent bond. The present work could provide a vital idea for designing electrode material with simultaneously improved activity and stability for H2O2 generation. Keywords Anthraquinone; Covalently modified carbon nanotube; Oxygen reduction reaction; Generation of hydrogen peroxide
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Introduction
Hydrogen peroxide(H2O2) has been widely applied in various fields, such as sterilization, chemical synthesis and environmental restoration due to its high redox ability and environmental friendship[1—5]. Among all the attempts to the generation of H2O2, electrocatalytic two-electron reduction of dioxygen for H2O2 generation has received significantly increasing attentions in recent years, owning to its advantages, such as green, feasibility and efficiency[6—8]. Therefore, it is vital to further develop more efficient cathode materials for H2O2 generation[9,10]. Noble-metal-based electrocatalysts, such as platinummercury alloys have demonstrated satisfactory performance for H2O2 generation. But they are impeded from high toxicity and earth scarcity[11,12]. Therefore, it is of great significance to search metal-free electrocatalysts with high reactivity for oxygen reduction reaction(ORR) and high selectivity to generate H2O2. Recently, carbonaceous materials, including graphene oxide(GO)[13], carbon nanotube(CNT)[14—17], carbon fiber (ACF)[18,19] and so on have been widely applied in electrocatalytic generation of H2O2 due to their unique properties, such as predominant chemical stability and high electroconductivity. Among them, CNT has been widely employed in electrocatalytically generating H2O2 due to its abundant surface area. As report
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