Carbon Materials as a Flowable Electrode in Electrochemical Flow Capacitors

Investigation of Carbon Materials for Use as a Flowable Electrode in Electrochemical Flow Capacitors
Jonathan W. Campos, Majid Beidaghi, Kelsey B. Hatzell, Christopher R. Dennison,  Benjamin Musci, Volker Presser,  Emin C. Kumbur, Yury Gogotsi

Rus На русском Eng In English

Novel electrical energy storage concept, the electrochemical flow capacitor (EFC), holds much promise for grid-scale energy storage applications. The EFC combines the principles behind the     Carbon Slurry;     Electrochemical Flow Capacitor;     Flow Battery;     Supercapacitor operation of flow batteries and supercapacitors, and enables rapid charging/discharging and decoupled energy/power ratings. Electrical charge is stored in a flowable carbon slurry composed of low-cost and abundantly available carbon particles in pH-neutral, aqueous electrolyte. Charge storage and transfer is analogous to solid carbon electrodes in conventional supercapacitors. Here, the effects of carbon particle solid fraction, shape, and size on the electrochemical and rheological properties of slurry electrodes are investigated. A static cell configuration is utilized for studying the electrochemical properties of the flowable electrodes. The electrochemical properties of the slurry electrodes tested in a static cell are found to be similar to that of solid electrodes in conventional supercapacitors for both, large spherical and anisometric activated carbons. Flow properties of the slurry electrodes are obtained for shear rates corresponding to pumping shear rates by rheometry. Results indicate that electrochemical and rheological properties of slurries depend on their concentration, shape and size of the carbon particles used in the slurries. For a range of concentrations, slurries based on spherical carbon particles show lower viscosities compared to anisometric activated carbon based slurries while performing similar electrochemically.

Fig. 2. (a-d) SEM micrographs of (a) CB1, (b) CB2, (c) CB3 and (d) AC, and (e) pore size distributions of the porous carbon materials used in this study.

Fig. 3. (a) Dependency of the average specific capacitance calculated from cyclic voltammetry (CV) on solid fraction of carbon particles; error bars show the standard deviation. The Cyclic voltammograms of carbon beads (CB) and activated carbon (AC) slurries (in 1 M Na2SO4) charged from 0 V to 0.75 V show capacitive behavior as demonstrated by rectangular shapes at low scan rates. CVs were recorded at (b) 5 mV s−1, (c) 20 mV s−1, and (d) 10 mV s−1.

Fig. 4. Specific capacitances at varying solid fractions (see legend in a) for scan rates from 2-100 mV s−1 calculated by CV for (a) CB1, (b) CB2, (c) CB3, and (d) AC.

Fig. 5. (a,b) Fifth galvanostatic cycle (200 mA g−1) after pre-cycling shows low resistance and symmetry of bead and AC slurries. (c) Dependency of the average specific capacitance and (d) ESR on solid fraction of porous carbon calculated from GC.

Fig. 6. Cyclic voltammograms of 23 wt% CB2 slurry charging to 0.9 - 1.5 V at 10 mV s−1. Coulombic efficiency drops slightly from 99.2 to 98.5% for the extended voltage window.Fig. 8. Rheograms of slurry electrodes, 20 and 23 wt% solid, in 1 M Na2SO4 with fits to raw data. Shear rates for a flow rate of 1-10 mL min−1 in the current lab scale EFC range from 40-400 s−1.






The electrochemical flow capacitor for grid-scale energy storage

Electrochemical Flow Cells for Rapid Energy Storage and Recovery












News from MRC.ORG.UA

Drexel's MXene Filter Materials will be used for Wearable Artificial Kidney Technology

MXene pores“Our fundamental study of titanium carbide MXene supported by NSF showed that MXene is biocompatible, able of adsorbing a variety of small molecules, and holds a lot of promise in medical applications, so it is exciting to see it applied for improving and really changing dialysis — an area of need in health care that can help millions of people,” said Yury Gogotsi, PhD, Distinguished University and Bach professor in Drexel’s College of Engineering, who is a world leader in developing and studying MXenes.

MXene Coating Could Prevent Electromagnetic Interference in Wearable Devices

mxene-emi-fabricResearchers at Drexel University’s College of Engineering have reported that MXene coated fabric is highly effective for blocking electromagnetic waves and potentially harmful radiation. The discovery is a key development for efforts to weave technological capabilities into clothing and accessories. 

MRC and Drexel collaborative article on Scalable MXene synthesis is listed among the most accessed in Advanced Engineering Materials journal for the whole year

bulk MXene

This article is also Highly Cited in Web of Science (top 1% of all papers in the field).

H2020 MSCA RISE CanBioSe project activities - EsR/ER training and scientific seminar held in MRC, Kyiv, Ukraine, July 30-August 01, 2020

Canbiose project training and seminar

Training of early-staged researchers involved in CanBioSe research works on nanomaterials processing and scientific seminar on Advances in nanomaterials research for biomedical applications, were held with invited experts.

Scalable Production System for the Promising, 2D Nanomaterials MXenes

altFor one of the most promising new types of 2D nanomaterials, MXenes, that’s no longer a problem. Researchers at Drexel University and the Materials Research Center in Ukraine have designed a system that can be used to make large quantities of the material while preserving its unique properties

CANBIOSE project participant from MRC completed secondment visit to partner organization Vilnius University, Lithuania, on February-March 2020 due to CANBIOSE project

altCANBIOSE project participant from MRC performed secondment visit to project partner organization Vilnius University, Lithuania, on February 24 - March 14 2020.

H2020 MSCA RISE SALSETH project participant from MRC V. Balitskiy started secondment at University of Novi Sad, Serbia

altSALSETH project participant from MRC Vitalii Balitskiy was hosted by partners from University of Novi Sad (UNS), Serbia, during his secondment visit according to the project plan.

SALSETH Project Kick-off meeting was held in University of Novi Sad, Serbia, on february 28, 2020

altResearch team from Materials Research Centre (MRC), Kyiv, Ukraine, was represented by Vitalii Balitskiy, who made a presentation to project partners about the MRC company, its capabilities, current research projects and main activities.

The science of the future and the use of intelligent nanomaterials in advanced technologies. Lecture by Professor Yury Gogotsi for students, schoolchildren of Junior Academy of Sciences of Ukraine in Igor Sikorsky Kyiv Polytechnic Institute,Feb 24, 2020


The science of the future and the use of smart nanomaterials in new technologies. Lecture by Professor Yury Gogotsi for students, and schoolchildren of the Junior Academy of Sciences of Ukraine in Sikorsky Kyiv Polytechnic Institute, February 27, 2020

Horizon 2020 NANO2DAY project participant A.Stepura from Polymer Institute of Slovak Academy of Science (Bratislava, Slovakia) was hosted by Materials Research Center (MRC), Kiev, Ukraine, on December 2019-February 2020

pisas--secondment-to-mrc-jan-2020_13.jpg - 86.27 KbAnastasiia Stepura from Polymer Institute Slovak Academy of Science (Bratislava, Slovakia) was hosted by Materials Research Centre  on December 2019- February 2020 during her secondment performing research works due to H2020 NANO2DAY project.

H2020 NANO2DAY project participants from MRC Veronika Zahorodna and Oleksiy Gogotsi visited partner organization Polymer Instityte SAS, Bratislava, Slovakia on January 2020

altResearchers from the Materials Research Center (MRC), Kiev, Ukraine,  Oleksiy Gogotsi and Veronika Zahorodna visited Horizon 2020 NANO2DAY project partner organization Polymer Institute of Slovak Academy of Science, Bratislava, Slovakia on January 2020. In cooperation with PISAS colleagues they were working on MXene doped polymer nanocomposites.

H2020 NANO2DAY project participant from MRC Ivan Hryshko was visiting project partner organization University of Latvia, Riga, on November-December 2019

altResearch engineer from MRC Ivan Hryshko is being visiting the University of Latvia, where he held a seminar on MXenes

Secondment of project participants from MRC O. Gogotsi and V. Zahorodna to project partners from LNEC under Horizon 2020 MSCA RISE Project №690968 NANOGUARD2AR, 12/11-11/12/2019, Lisboan, Portugal

altMRC Director O. Gogotsi and EsR Veronika Zahorodna in a secondment to LNEC, Lisboan, Portugal participated in a work meeting discussing project results and performing engineering research works due to H2020 MSCA RISE project No 690968 NANOGUARD2AR.

Horizon 2020 CANBIOSE project participants from Materials Research Center (MRC), Kiev, Ukraine visited partner organization Adam Mickiewicz University in Poznań, Poland, on October 27-November 27, 2019

altIn cooperation with AMU colleagues they were working on nanomaterials testing and characterization.


altThe symposium brought together leading international experts and those researchers who are just entering the exciting world of 2D carbides and nitrides to explore new synthesis methods, better understand properties and find new applications of MXenes.