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论文类型：期刊论文

发表时间：2019-08-28

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE、EI

卷号：7

期号：32

页面范围：18852-18860

ISSN号：2050-7488

摘要：Electrochemical reduction of CO2 is a promising strategy to produce syngas, which is an essential feedstock for production of different industrial chemicals. However, it remains a great challenge to realize stable electrosynthesis of syngas with potential-independent CO/H-2 ratios due to the limited mass transport and inefficient catalytic interface. Herein, a series of nitrogen-doped tubular carbon foam electrodes were designed and used as both gas diffusers and self-supported electrocatalysts. Owing to the direct delivery of CO2, forced convection flow and tunable number of active sites, the monolithic tubular electrodes enable efficient electrosynthesis of syngas with tuned CO/H-2 ratios (1: 3 to 2 :1) by CO2 reduction in a wide potential range (-0.5 V to-1.3 V vs. RHE). Experimental and simulation studies reveal that the novel tubular carbon foam configuration significantly enhances the mass transport and provides an efficient triple-phase catalytic interface, resulting in relatively stable syngas production in the high-overpotential region.