Optimization of the voltage window for long-term capacitive deionization stability

Abstract Capacitive deionization (CDI) is an energy efficient desalination technology. In this study, we conducted CDI experiments under different conditions and observed severe performance degradation from 7.3 to 0.5 mg/g after 70 cycles in symmetric 1.2/0 V operation because of anode oxidation under polarization. To eliminate the degradation, different charging and discharging voltages were tested in an asymmetric cell and 0.8/−0.4 V was selected as the optimized voltage window. Under the optimized voltage window, a capacity of 6.3 mg/g was obtained, only somewhat lower than that of the 1.2/0 V experiment, and the stability and charge efficiency were much higher by greatly mitigating the electrode corrosion. In addition, the process had a lower energy consumption. The stable performance in air- and oxygen-saturated conditions indicates that the optimized CDI has superior capacity and better performance than conventional CDI.

[1]  J. A. Ritter,et al.  Correlation of Double‐Layer Capacitance with the Pore Structure of Sol‐Gel Derived Carbon Xerogels , 1999 .

[2]  Ayokunle Omosebi,et al.  Capacitive Deionization Using Alternating Polarization: Effect of Surface Charge on Salt Removal , 2017 .

[3]  C. Ania,et al.  Stability of a carbon gel electrode when used for the electro-assisted removal of ions from brackish water , 2011 .

[4]  Hubertus V. M. Hamelers,et al.  On-line method to study dynamics of ion adsorption from mixtures of salts in capacitive deionization , 2016 .

[5]  Benoit Barbeau,et al.  Removal of total dissolved solids, nitrates and ammonium ions from drinking water using charge-barrier capacitive deionisation , 2009 .

[6]  Doron Aurbach,et al.  Long term stability of capacitive de-ionization processes for water desalination: The challenge of positive electrodes corrosion , 2013 .

[7]  Wangwang Tang,et al.  Faradaic Reactions in Water Desalination by Batch-Mode Capacitive Deionization , 2016 .

[8]  Volker Presser,et al.  Review on the science and technology of water desalination by capacitive deionization , 2013 .

[9]  Zhuo Sun,et al.  Electrophoretic deposition of carbon nanotubes–polyacrylic acid composite film electrode for capacitive deionization , 2012 .

[10]  Min-Woong Ryoo,et al.  Improvement in capacitive deionization function of activated carbon cloth by titania modification. , 2003, Water research.

[11]  Sotira Yiacoumi,et al.  Electrosorption of ions from aqueous solutions by carbon aerogel: An electrical double-layer model , 2001 .

[12]  P. M. Biesheuvel,et al.  Time-dependent ion selectivity in capacitive charging of porous electrodes. , 2012, Journal of colloid and interface science.

[13]  P. M. Biesheuvel,et al.  Resistance identification and rational process design in Capacitive Deionization. , 2016, Water research.

[14]  Linda Zou,et al.  Ion-selective carbon nanotube electrodes in capacitive deionisation , 2013 .

[15]  Wei Ma,et al.  Preparing CNTs/Ca-Selective zeolite composite electrode to remove calcium ions by capacitive deionization , 2013 .

[16]  P. M. Biesheuvel,et al.  Water Desalination with Wires. , 2012, The journal of physical chemistry letters.

[17]  P. M. Biesheuvel,et al.  Diffuse charge and Faradaic reactions in porous electrodes. , 2011, Physical review. E, Statistical, nonlinear, and soft matter physics.

[18]  J. Farmer,et al.  Electrosorption of Chromium Ions on Carbon Aerogel Electrodes as a Means of Remediating Ground Water , 1997 .

[19]  Marc A. Anderson,et al.  Capacitive deionization as an electrochemical means of saving energy and delivering clean water. Comparison to present desalination practices: Will it compete? , 2010 .

[20]  Ayokunle Omosebi,et al.  Enhanced Salt Removal in an Inverted Capacitive Deionization Cell Using Amine Modified Microporous Carbon Cathodes. , 2015, Environmental science & technology.

[21]  Ayokunle Omosebi,et al.  Asymmetric electrode configuration for enhanced membrane capacitive deionization. , 2014, ACS applied materials & interfaces.

[22]  Gang Wang,et al.  Ultrasound-assisted preparation of electrospun carbon fiber/graphene electrodes for capacitive deionization: Importance and unique role of electrical conductivity , 2016 .

[23]  Jae-Hwan Choi,et al.  Improvement of desalination efficiency in capacitive deionization using a carbon electrode coated with an ion-exchange polymer. , 2010, Water research.

[24]  Xin Gao,et al.  Surface charge enhanced carbon electrodes for stable and efficient capacitive deionization using inverted adsorption–desorption behavior , 2015 .

[25]  Walter A. Zeltner,et al.  Synthesis and characterization of asymmetric electrochemical capacitive deionization materials using nanoporous silicon dioxide and magnesium doped aluminum oxide , 2009 .

[26]  Nicolas E. Holubowitch,et al.  Polymer-coated composite anodes for efficient and stable capacitive deionization , 2016 .

[27]  Jae-Hwan Choi,et al.  Enhanced desalination efficiency in capacitive deionization with an ion-selective membrane , 2010 .

[28]  P. M. Biesheuvel,et al.  A prototype cell for extracting energy from a water salinity difference by means of double layer expansion in nanoporous carbon electrodes , 2011 .

[29]  Jong-Ho Kim,et al.  Role of titania incorporated on activated carbon cloth for capacitive deionization of NaCl solution. , 2003, Journal of colloid and interface science.

[30]  Volker Presser,et al.  Enhanced performance stability of carbon/titania hybrid electrodes during capacitive deionization of oxygen saturated saline water , 2017 .

[31]  P. M. Biesheuvel.  Electrostatic free energy of interacting ionizable double layers. , 2004, Journal of colloid and interface science.

[32]  P. M. Biesheuvel,et al.  Energy consumption and constant current operation in membrane capacitive deionization , 2012 .

[33]  Doron Aurbach,et al.  A control system for operating and investigating reactors: The demonstration of parasitic reactions in the water desalination by capacitive de-ionization , 2011 .

[34]  Xin Gao,et al.  Dependence of the Capacitive Deionization Performance on Potential of Zero Charge Shifting of Carbon Xerogel Electrodes during Long-Term Operation , 2014 .

[35]  H. Boehm.,et al.  Surface oxides on carbon and their analysis: a critical assessment , 2002 .

[36]  Xin Gao,et al.  Continuous operation of membrane capacitive deionization cells assembled with dissimilar potential of zero charge electrode pairs. , 2015, Journal of colloid and interface science.

[37]  Akili D. Khawaji,et al.  Advances in seawater desalination technologies , 2008 .

[38]  Linda Zou,et al.  Using activated carbon electrode in electrosorptive deionisation of brackish water , 2008 .

[39]  Chia-Hung Hou,et al.  Improved performance in capacitive deionization of activated carbon electrodes with a tunable mesopore and micropore ratio. , 2015 .

[40]  V. Presser,et al.  Performance evaluation of conductive additives for activated carbon supercapacitors in organic electrolyte , 2016 .

[41]  L. Zou,et al.  Preparing MnO2/PSS/CNTs composite electrodes by layer-by-layer deposition of MnO2 in the membrane capacitive deionisation , 2012 .

[42]  Wei Zhang,et al.  Preparation and Application of Electrodes in Capacitive Deionization (CDI): a State-of-Art Review , 2016, Nanoscale Research Letters.

[43]  P. M. Biesheuvel,et al.  Complementary surface charge for enhanced capacitive deionization. , 2016, Water research.

[44]  C. F. Schutte,et al.  Capacitive Deionization Technology™: An alternative desalination solution , 2005 .

[45]  Jae-Hwan Choi,et al.  Electrode reactions and adsorption/desorption performance related to the applied potential in a capacitive deionization process , 2010 .

[46]  Yuping Li,et al.  Desalination stability of capacitive deionization using ordered mesoporous carbon: Effect of oxygen-containing surface groups and pore properties , 2015 .

[47]  Jeyong Yoon,et al.  Comparison of salt adsorption capacity and energy consumption between constant current and constant voltage operation in capacitive deionization , 2014 .

[48]  Volker Presser,et al.  Faradaic deionization of brackish and sea water via pseudocapacitive cation and anion intercalation into few-layered molybdenum disulfide , 2017 .

[49]  Y. Oren,et al.  Capacitive deionization (CDI) for desalination and water treatment — past, present and future (a review) , 2008 .

[50]  Rylan Dmello,et al.  Na-Ion Desalination (NID) Enabled by Na-Blocking Membranes and Symmetric Na-Intercalation: Porous-Electrode Modeling , 2016 .

[51]  Yong Liu,et al.  Review on carbon-based composite materials for capacitive deionization , 2015 .

[52]  Doron Aurbach,et al.  The effect of the flow-regime, reversal of polarization, and oxygen on the long term stability in capacitive de-ionization processes , 2015 .

[53]  Doron Aurbach,et al.  Capacitive Deionization of NaCl Solutions at Non-Steady-State Conditions: Inversion Functionality of the Carbon Electrodes , 2011 .

[54]  Jihyun Yu,et al.  Hydrogen peroxide generation in flow-mode capacitive deionization , 2016 .

[55]  Volker Presser,et al.  High performance stability of titania decorated carbon for desalination with capacitive deionization in oxygenated water , 2016 .