Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Rising levels of CO2 accumulation in the atmosphere has attracted considerable interest in technologies capable of CO2 capture, storage and conversion. [1,2] One promising route for CO2 reduction is through the electrochemical reduction of CO2 (CO2RR) using heterogeneous catalysts to produce value added chemicals such as CO, formate, ethanol and methanol. [3–5] CO2RR is carried out in ambient conditions through the application of an external electrical bias and the method mimics the photosynthesis process occurring in plants. The electricity required for CO2RR can be drawn from solar PV cells, which will provide additional benefits of storing the diffusive and intermittent renewable energy resource in the form of chemical fuels. In recent times, the conversion of CO2 to liquid products is becoming more desirable, as the products can be easily stored and transported for subsequent usage within the current infrastructure. In this regard, we have developed simple, scalable and cost-effective surface modified Sn foils that achieve a high selectivity for conversion of CO2 to formate (HCOO-), attaining a FEHCOO- (Faradaic Efficiency for HCOO-) of 77.40% at an applied potential of -1.09 V with a current density of 4.80 mA cm-2. [6] To further improve the attainable current densities for HCOO- production, we also designed highly crystalline nanostructured SnO2 electrocatalysts that were shown to demonstrate improved mass transport properties that resulted in one of the highest catalytic activities at low overpotential region and achieved a maximum FEHCOO- of 75% and large current densities of 10.80 mA cm-2 at -1.15 V.
[1] J. P. Jones, G. K. S. Prakash, G. A. Olah, Isr. J. Chem. 2014, 54, 1451–1466.
[2] A. M. Appel, J. E. Bercaw, A. B. Bocarsly, H. Dobbek, D. L. Dubois, M. Dupuis, J. G. Ferry, E. Fujita, R. Hille, P. J. A. Kenis, et al., 2012.
[3] M. Gattrell, N. Gupta, A. Co, Energy Convers. Manag. 2007, 48, 1255–1265.
[4] R. Daiyan, X. Lu, Y. H. Ng, R. Amal, ChemistrySelect 2017, 2, 879–884.
[5] X. Lu, T. H. Tan, Y. H. Ng, R. Amal, Chem. - A Eur. J. 2016, 2052, 1–7.
[6] R. Daiyan, X. Lu, Y. H. Ng, R. Amal, Catal. Sci. Technol., 2017, DOI: 10.1039/c7cy00246g.
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