A pH-differential dual-electrolyte microfluidic electrochemical cells for CO2 utilization |
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| Affiliation: | 1. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong;2. Centre for Innovation in Carbon Capture and Storage (CICCS), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, UK;1. School of Energy Science and Engineering, Central South University, Changsha, Hunan 410083, China;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA;1. School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China;2. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China;1. University School of Chemical Technology, GGS IP University, Delhi, India;2. Department of Chemical Engineering, IIT, Delhi, India;1. Université de Tunis El Manar, Ecole Nationale d''Ingénieurs de Tunis, LR11ES15 Laboratoire des Systèmes Electriques, 1002, Tunis, Tunisie;2. Université Fédérale de Toulouse Midi-Pyrénées, INPT, UPS, LAPLACE, 2 Rue Charles Camichel, BP 7122, F-31071, Toulouse Cedex 7, France;1. Molecular Biochemistry Laboratory, Materials and Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland;2. Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Tamilnadu, India |
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| Abstract: | CO2 can be converted to useful fuels by electrochemical processes. As an effective strategy to address greenhouse effect and energy storage shortage, electrochemical reduction of CO2 still needs major improvements on its efficiency and reactivity. Microfluidics provides the possibility to enhance the electrochemical performance, but few studies have focused on the virtual interface. This work demonstrates a dual electrolyte microfluidic reactor (DEMR) that improves the thermodynamic property and raises the electrochemical performance based on a laminar flow membrane-less architecture. Freed from hindrances of a membrane structure and thermodynamic limitations, DEMR could bring in 6 times higher reactivity and draws electrode potentials closer to the equilibrium status (corresponded to less electrode overpotentials). The cathode potential was reduced from ?2.1 V to ?0.82 V and the anode potential dropped from 1.7 V to 1 V. During the conversion of CO2, the peak Faradaic and energetic efficiencies were recorded as high as 95.6% at 143 mA/cm2 and 48.5% at 62 mA/cm2, respectively, and hence, facilitating future potential for larger-scale applications. |
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| Keywords: | Energy storage Electrochemistry Dual electrolyte Microfluidics |
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