A High Performance Pseudocapacitive Suspension Electrode for the Electrochemical Flow Capacitor

Fig. 1. (a) Operational schematic of the electrochemical flow capacitor. Uncharged slurry flows through polarized plates and charged. At the pore level, electrode neutrality is maintained at the interface between the electrolyte and active material. This slurry is then pumped into external reservoirs for storage. The process is reversed during discharge. (b) Schematic of a carbon|electrolyte interface between charged spherical particles and (c) SEM image of carbon beads.

Publication on the electrochemical flow capacitor (EFC) by nanomaterials group of DNI, Drexel University, USA. EFC is a new technology for grid energy storage that is based on the fundamental principles of supercapacitors.

Fig. 1. (a) Operational schematic of the electrochemical flow capacitor. Uncharged slurry flows through polarized plates and charged. At the pore level, electrode neutrality is maintained at the interface between the electrolyte and active material. This slurry is then pumped into external reservoirs for storage. The process is reversed during discharge. (b) Schematic of a carbon|electrolyte interface between charged spherical particles and (c) SEM image of carbon beads.

Rus На русском Eng In English

Electrochimica Acta,Volume 111, 30 November 2013, Pages 888–897

A High Performance Pseudocapacitive Suspension Electrode for the Electrochemical Flow Capacitor

  • Kelsey B. Hatzella,
  • Majid Beidaghia,
  • Jonathan W. Camposa,
  • Christopher R. Dennisona, b,
  • Emin C. Kumburb,
  • Yury Gogotsia, 1, Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript
  • a A. J. Drexel Nanotechnology Institute, Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
  • b Electrochemical Energy Systems Laboratory, Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA

Fig. 2. SEM image of activated carbon beads. (a) As-received beads with pristine surface, (b) Carbon beads from slurry after being cycled 1000 times in 2 M KOH and 0.139 M PPD. Insets show magnified images of the bead surfaces.The electrochemical flow capacitor (EFC) is a new technology for grid energy storage that is based on the fundamental principles of supercapacitors. The EFC benefits from the advantages of both supercapacitors and flow batteries in that it is capable of rapid charging/discharging, has a long cycle lifetime, and enables energy storage and power to be decoupled and optimized for the desired application.

The unique aspect of the EFC is that it utilizes a flowable carbon-electrolyte suspension (slurry) for capacitive energy storage. Similar to traditional supercapacitor electrodes, this aqueous slurry is limited in terms of energy density, when compared to batteries. To address this limitation, in this study a pseudocapacitive additive has been explored to increase capacitance. Fig. 3. Standard two-proton/two-electron oxidation and reduction reaction of p-phenylenediamine to p-phenylenediimine. (dark grey, dark blue and white correspond to carbon, nitrogen and hydrogen atoms).

Fig. 4. Capacitance as a function of changing concentrations of p-phenylenediamine and sweep rates ranging from 2 mV s−1 to 100 mV s−1.A carbon-electrolyte slurry prepared with p-phenylenediamine (PPD), a redox mediator, shows an increased capacitance on the order of 86% when compared with KOH electrolytes, and a 130% increase when compared to previously reported neutral electrolyte based slurries. The redox-mediated slurry also appears to benefit from a decrease in ohmic resistance with increasing concentrations of PPD, most likely a result of an increase in the ionic diffusion coefficient. Among the tested slurries, a concentration of 0.139 M of PPD in 2 M KOH electrolyte yields the largest capacitance and rate handling performance in both cyclic voltammetry and galvanostatic cycling experiments.

The improved performance is attributed to the addition of quick faradaic reactions at the electrolyte-electrode interface as PPD undergoes a two-proton/two-electron reduction and oxidation reaction during cycling.

Source: www.sciencedirect.com

Related Items: Carbon Materials as a Flowable Electrode in Electrochemical Flow Capacitors

 

News from MRC.ORG.UA

The 6th International Conference on Novel Functional Carbon Nanomaterials at the 8th Forum on New Materials (CIMTEC 2018) in Perugia, Italy, June 11-14

Фото Yury Gogotsi.The 6th International Conference “Novel Functional Carbon Nanomaterials”within the 8th Forum on New Materials at CIMTEC 2018 held in Perugia, Italy,  highlighted recent achievements and challenges in the synthesis, structural control and modeling at the meso- and nano-scales of the variety of low-dimensional carbon allotropes including nanodiamonds, diamond-like carbon, fullerenes, nanotubes, graphene and graphene-related structures, as well as high surface area carbon networks, which are promising for a range of emerging applications in energy conversion and storage, water purification, high-speed nanoelectronics, optoelectronics, photonics, quantum information processing, quantum computing, biosensing, drug delivery, medical imaging, thermal management, catalysis, lubrication, etc.

 
1st International Conference on MXenes at Jilin University, Changchun, China

MXene conference 2018The meeting is the first international conference focusing on MXene materals, which is to bring scientists in the two-dimensional materials or energy area to interact and discuss the advances and challenges in various fields.

 
Our Congratulations to Prof. Gogotsi with Receiving an Honorary Doctorate from Kyiv Polytechnic Institute KPIthe National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute"

 Prof. Yury Gogotsi received an honorary doctorate from the National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic InstituteOn May 14th, 2018, Prof. Yury Gogotsi received an honorary doctorate from the National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute (NTUU “KPI”), Kiev, Ukraine.

 
H2020-MSCA-RISE Nano2Day Kick-off project meeting, Academic Centre of University of Latvia, Riga, 10-11 May 2018

altH2020-MSCA-RISE project „Multifunctional polymer composites doped with novel 2D nanoparticles for advanced applications NANO2DAY” started on May 1, 2018. It is aimed to develop novel multifunctional composites with outstanding electronic and mechanical properties by incorporation of novel MXene nanosheets into polymer matrixes.

 
Materials Research Center team visited the Training " on "How to write a successful proposal in Horizon 2020" at National Aviation University of Ukraine" as part of the NAU Info Day

horizon2020 семінарOn February 14, 2018, Materials Research Center team visited the Training " on "How to write a successful proposal in Horizon 2020" at National Aviation University of Ukraine"  as part of the NAU Info Day.

 
Paper on Rheological Characteristics of 2D Titanium Carbide (MXene) Dispersions: A Guide for Processing MXenes

Processing guidelines for the fabrication of MXene films, coatings, and fibers have been established based on the rheological propertiesProcessing guidelines for the fabrication of MXene films, coatings, and fibers have been established based on the rheological properties.

 
Professor Yury Gogotsi will give a lecture on 2D materials MXenes in Stanford University

altProfessor Yury Gogotsi will give a lecture on 2D materials MXenes on MSE winter Colloquim in Materials Science and Engineering Department, Stanford University. 

 
MXene is one of the most sensitive gas sensors ever reported

MXene gas sensorsMXene is one of the most sensitive gas sensors ever reported that sniff out chemicals in the air to warn us about everything from fires to carbon monoxide to drunk drivers to explosive devices hidden in luggage have improved so much that they can even detect diseases on a person’s breath. Researchers from Drexel University and the Korea Advanced Institute of Science and Technology have made a discovery that could make our best “chemical noses” even more sensitive.

 
Professor Yury Gogotsi, Drexel University, USA, gave a plenary lecture at the 2018 Energy Future Conference in Sydney, Australia, 5-7 February 2018

Professor Gogotsi gave a plenary lecture on  two-dimensional materials MXenes

Professor Yury Gogotsi, Drexel University, USA,  gave a plenary lecture on February 06, 2018 and chaired a plenary session on February 05 at the Energy Future Conference (EF3 Conference 2018) in Sydney. EF3 Conference 2018 brought together scientists, engineers, policy makers, investors, academia, and industry to discuss the latest advances in energy technology. 

 
US-Czech Conference on Advanced Nanotechnology and Chemistry 17 th – 18th January 2018, Prague, Czech

US-Czeh conference on advanced nanotechnologiesMore than 30 speakers from USA and Czech were invited, among them also was invited outstanding scientist, professor Yury Gogotsi, founder director of Drexel Nanomaterials Institute in Drexel University, USA.

 
Director of Materials Research Centre Oleksiy Gogotsi visited Jiln University, Changchun, China

Visit to Jilin University, Changchun, ChinaDirector of Materials Research Centre Oleksiy Gogotsi visited Jiln University, Changchun, China. He had a work meeting with Yury Gogotsi, Distinguished University Professor and Trustee Chair in the Department of Materials Science and Engineering at Drexel University, USA, and Distinguished Foreign Professor at Jilin University and Professor Wei Han, Executive Deputy Director of International Collaborative Center of Talents, International Center of Future Science, and discussed ongoing joint works and research on materials for supercapacitors.

 
ICEnSM 2017. 2017 International Conference on Energy Storage Materials, Shenzhen, China, November 18-21, 2017

The First International Conference on Energy Storage Materials Professor Yury Gogotsi from Drexel University, USA, has won the 2017 Energy Storage Materials Award, which is awarded by the journal Energy Storage Materials. The Award will be presented to Professor Gogotsi at the ICEnSM 2017 (2017 International Conference on Energy Storage Materials), which will be held in Shenzhen, China, on Nov. 18-21, 2017.

 
Congratulations to professor Yury Gogotsi for being named 2017 Highly Cited Researcher in two categories!

altHis research ranks among the top 1% most cited works in his field and during its year of publication, earning the mark of exceptional impact. This year is the first time Yury Gogotsi made this list in two categories - Materials Science and Chemistry.

 
Nanodiamonds Can Prevent Lithium Battery Fires
 
Session dedicated to HORIZON-2020-MSCA-RISE project 690853 «Asymmetry of biological membrane: theoretical, experimental and applied aspects» ( assymcurv ), 5th International Conference "Nanobiophysics-2017"

ilt logoOleksiy Gogotsi, director of Materials Research Center presented join research on synthesis and biomedical applications of 2D carbides MXenes.