通过分层多孔碳的氧还原高效电合成过氧化氢。
High-yield electrosynthesis of hydrogen peroxide from oxygen reduction by hierarchically porous carbon.
机构信息
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024 (China).
出版信息
Angew Chem Int Ed Engl. 2015 Jun 1;54(23):6837-41. doi: 10.1002/anie.201502396. Epub 2015 Apr 17.
H2O2 production by electroreduction of O2 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 O2 reduction. It exhibited high activity for O2 reduction and good H2O2 selectivity (95.0-70.2%, most of them >90.0% at pH 1-4 and >80.0% at pH 7). High-yield H2O2 generation has been achieved on HPC with H2O2 concentrations of 222.6-62.0 mmol L(-1) (2.5 h) and corresponding H2O2 production rates of 395.7-110.2 mmol h(-1) g(-1) at pH 1-7 and -0.5 V. 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.
H2O2 的电还原生产是替代当前蒽醌工艺的一种有吸引力的方法，蒽醌工艺在化学工业和环境修复中非常需要。然而，开发用于 H2O2 合成的具有成本效益的电催化剂仍然是一个巨大的挑战。在这里，提出了分层多孔碳 (HPC) 用于从 O2 还原中电合成 H2O2。它表现出高的 O2 还原活性和良好的 H2O2 选择性 (95.0-70.2%，大多数在 pH 1-4 时>90.0%，在 pH 7 时>80.0%)。在 HPC 上已经实现了高产率的 H2O2 生成，H2O2 浓度为 222.6-62.0 mmol L(-1)（2.5 h），相应的 H2O2 生成速率为 395.7-110.2 mmol h(-1) g(-1)，pH 值为 1-7 和 -0.5 V。此外，HPC 用于 H2O2 生产的能量效率很高，电流效率为 81.8-70.8%。HPC 对 H2O2 电合成的优异性能可归因于其高含量的 sp(3)-C 和缺陷、大表面积和快速传质。
Zotero 插件