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Indexed by:Journal Papers

Date of Publication:2015-06-01

Journal:ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Included Journals:SCIE、EI、PubMed、Scopus

Volume:54

Issue:23

Page Number:6837-6841

ISSN No.:1433-7851

Key Words:electrocatalysis; electrochemistry; hydrogen peroxide synthesis; oxygen reduction; porous carbon

Abstract:H2O2 production by electroreduction of O-2 is an attractive alternative to the current anthraquinone process, which is highly desirable for chemical industries and environmental remediation. However, it remains a great challenge to develop cost-effective electrocatalysts for H2O2 synthesis. Here, hierarchically porous carbon (HPC) was proposed for the electrosynthesis of H2O2 from O-2 reduction. It exhibited high activity for O-2 reduction and good H2O2 selectivity (95.0-70.2%, most of them >90.0% at pH1-4 and >80.0% at pH7). High-yield H2O2 generation has been achieved on HPC with H2O2 concentrations of 222.6-62.0mmolL(-1) (2.5h) and corresponding H2O2 production rates of 395.7-110.2mmolh(-1)g(-1) at pH1-7 and -0.5V. Moreover, HPC was energy-efficient for H2O2 production with current efficiency of 81.8-70.8%. The exceptional performance of HPC for electrosynthesis of H2O2 could be attributed to its high content of sp(3)-C and defects, large surface area and fast mass transfer.