Ultrasonic assisted synthesis of Zn-Ni bi-metal MOFs for interconnected Ni-N-C materials with enhanced electrochemical reduction of CO2. (July 2019)

• Record Type: Journal Article
• Authors: Ma, Zhongjun; Wu, Dapeng; Han, Xueyun; Wang, Hongju; Zhang, Lumin; Gao, Zhiyong; Xu, Fang; Jiang, Kai
• Is Part Of: Journal of CO₂ utilization. Volume 32(2019)
• Page Start: 251
• Page End: 258
• Publication Date: 2019-07
• Subjects: Ni-N-C materials -- Ultrasonic assisted synthesis -- CO2 reduction -- Electrochemical reduction; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.04.006
• Languages: English
• ISSNs: 2212-9820

Abstract

Highlights: A Ni and N-doped porous interconnected carbon (NiNPIC) was prepared by a rapid and facile ultrasonic assisted method. A high current density of 10.2 mA cm −2, an FE of 95.1%, a TOF of 1886 h -1 for CO2 -to-CO at a low over-potential of -0.54 V. The interconnected structure, high surface area and rich Ni-N-C moisture leads to better electron transfer and lower interface resistance. The hierarchical porous structure greatly enhanced the mass transport in the electrode. Abstract: Zn-Ni bi-metal MOFs were employed as precursors to prepare Ni-N-doped porous interconnected carbon (NiNPIC) catalysts for enhanced electrocatalytic activity and selectivity of the CO2 RR. It was found that the Ni load amounts could be precisely controlled by altering the Ni dosage in the bi-metal MOF precursors, and the gradually increased Ni-N species leads to the enhanced CO2 RR performances. The high surface area as well as interconnected porous structures of the catalysts provide highly accessible Ni-N sites and convenient channel for mass diffusion, which gives rise to better electron transfer, lower interface resistance and high electrolyte/gases transport in the CO2 RR. Thanks to these structural advantages, the optimized catalyst demonstrated efficient convert CO2 into CO with a current density of 10.2 mA cm −2 (113 mA mg −1 ), a FECO of 95.1%, a production rate of 542 μmol m −2 s −1 (36.1 μmol mg −1 min −1 ), and outstanding electrochemical stability at a moderate over-potential of 0.54 V (vs. the RHE).