2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
Abstract Submission
Login

DETAILLED PROGRAM OVERVIEW

Back
    Selective Reduction of Carbon Dioxide in Water using Earth Abundant Metal and Nitrogen Doped Carbon Electrocatalysts
    Kim Daasbjerg1; Xin-ming Hu1; Jun-jie Shi1; Steen U. Pedersen1; Troels Skrydstrup1; Halvor H. Hval1;
    1INTERDISCIPLINARY NANOSCIENCE CENTER, AARHUS UNIVERSITY, Aarhus C, Denmark;
    PAPER: 256/Electrochemistry/Regular (Oral)
    SCHEDULED: 11:45/Mon./Copacabana B (150/1st)



    ABSTRACT:
    Earth-abundant transition metal (Fe, Co, or Ni) and nitrogen doped porous carbon electrocatalysts (M-N-C) were synthesized for CO<sub>2</sub> valorization from cheap precursors via silica templated pyrolysis. [1] The effect of the material composition and structure (i.e. porosity, nitrogen doping, metal identity, and oxygen functionalization) on the activity for the electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) in water was investigated. The activity/selectivity order for CO<sub>2</sub>-to-CO conversion is Ni > Fe >> Co with respect to the metal in M-N-C. Notably, the Ni doped carbon exhibits a high selectivity with a faradaic efficiency of 93% for CO production. The metal free material exhibits a high selectivity but low activity for the CO<sub>2</sub>RR. Tafel analysis shows a change of the rate-determining step as the metal overtakes the role of the nitrogen as the most active site.<br />Recording of X-ray photoelectron spectra and extended X-ray absorption fine structure demonstrates that the metals are atomically dispersed in the carbon matrix, most likely coordinated to four nitrogen atoms and with carbon atoms serving as a second coordination shell. Presumably, the carbon atoms in the second coordination shell affect the CO<sub>2</sub>RR activity, considering that the reactivity order for the central metal in carbon supported metal meso-tetraphenylporphyrin complexes is the opposite. From a better understanding of the relationship between the CO<sub>2</sub>RR activity and the material structure, it becomes possible to rationally design high-performance porous carbon electrocatalysts for CO<sub>2</sub> valorization. [2]

    References:
    [1] H. W. Liang, S. Brüller, R. H. Dong, J. Zhang, X. L. Feng, K. Müllen, Nat. Commun. 6 (2015) 7992.<br />[2] W. Ju, A. Bagger, G.-P. Hao, A. S. Varela, I. Sinev, V. Bon, B. Roldan Cuenya, S. Kaskel, J. Rossmeisl, P. Strasser, Nat. Commun. 8 (2017) 944.