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

Yury Gogotsi is the most influential scientist of modern Ukraine

altThe life of Yury Gogotsi is a constant back and forth between the top laboratories in the world, writing articles in the best scientific journals and research materials that can change the world around them. 

 
Professor Yury Gogotsi , Drexel University, USA, received an Honorary Doctorate from Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine, Kiev, Ukraine, June 20, 2017.

Deputy Directors of IPMS NAS professors Dr. Ragulya, Dr. Baglyuk, Mr. Zavorotnyi, Honorary Professor of IPMS NASU Yury Gogotsi,  Scientific Secretary Dr. Kartuzov and Dr. Firstov Professor Yury Gogotsi , Drexel University, USA,  received an Honorary Doctorate from Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine.

 
Professor Yury Gogotsi was speaking about nanotechnology in energy storage at the World Science Festival 2017

Professor Yury Gogotsi at World Science Festival 2017Join world-class nanoscientists and environmental leaders to explore how the capacity to harness molecules and atoms is accelerating spectacular inventions — including light-weight “wonder materials,” vital energy-storage technologies, and new sources of renewable energy — which promise to redefine the very future of energy.

 
MXenes are at the forefront of 2D materials research

alt

Research of 2D MXenes is prominently featured in an article in Chemical & Engineering News - bulletin of the American Chemical Society that goes in hard copy to more than 150,000 subscribers. No doubt, MXenes are at the forefront of 2D materials research.

 
IDEATION Seminars: A New Platform for Innovation Management, Promotion, Licensing, Technology Transfer and Commercialization, June 7 at 14:30, KPI, Kyiv

altSpeakers:  Victor Korsun and Douglas Graham

 
Nano Iguana became a 1st place winner at 2017 MRS Science as Art Competition

Entry Nano Iguana became a 1st place winner at Science as Art Competition 2017: Nano-anatase (TiO2) crystals decorating graphene-like carbon, fabricated by oxidizing 2d Ti3C2 MXene powder, presented by A. J. Drexel Nanotechnology Institute and Department of Materials Science  and Engineering, Drexel University, USAResearch team from Drexel University lead by professor Yury Gogotsi produced an award-wining entry and became the 1st place winner in Science as Art competition at 2017 MRS Spring meeting in Phoenix.

 
1st Africa Energy Materials conference, 28 – 31 March 2017, Pretoria, South Africa

1st Africa Energy Materials conference On the first day of the conference, on March 28, the conference participants had an opportunity to attend a plenary lecture "Two-Dimensional Materials for High Rate and High-energy Density Storage" by invited plenary speaker professor Yury Gogotsi, Distinguished University Professor and Trustee Chair of Materials Science and Engineering at Drexel University, and Director of the A.J. Drexel Nanomaterials Institute 

 
Workshop “Nanomaterials – based innovative engineering solution to ensure sustainable safeguard to indoor air “ NANOGUARD2AR 27-28 February, Lisbon, Portugal

altThe goal of the workshop is to attract the most recognized academic experts in the field of Innovative Nanomaterials for Environmental Application to share their knowledge and expertise on nanomaterials, nanoengineering and green building concepts.

 
MATERIAL WITNESSES — RESEARCHERS AROUND THE WORLD ARE DELVING INTO DREXEL’S 2D MXENE

Researchers from the A.J. Drexel Nanomaterials Institute have been studying MXene for nearly half a decade. (L-R): Olekisy Gogotsi (Director of Materials Research Center, Ukraine), Gabriel Scull, Babak Anasori, Mohamed Alhabeb, Yury Gogotsi.

More than twenty 2D carbides, nitrides and carbonitrides of transition metals (MXenes) have been synthesized and studied, and dozens more predicted to exist. Highly electrically conductive MXenes show promise in electrical energy storage, electromagnetic interference shielding, electrocatalysis, plasmonics and other applications.

 
Prof. Gogotsi has been included in the list of ISI Highly Cited researchers for the 3rd year in the row

altProf. Gogotsi has been named among Highly Cited Researchers 2016, representing worlds most influential scientific minds

 
Appointment ceremony of Honorary professorship for prof. Yury Gogotsi, Jilin University, Changchun, China on October 20, 2016

Honorary professor of Jilin University Yury Gogotsi  and Li Yuanyuan, President of Jilin University, academician of the Chinese Academy of Engineering

The official appointment ceremony of Honorary professorship for Dr. Yury Gogotsi took place in a ceremonial atmosphere at Jilin University, Changchun, Jilin Province, China on October 20, 2016.

 
12th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XII)

12th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XII)12th IUPAC International Conference on Novel Materials and their Synthesis (NMS-XII), is held during 14-19 October, 2016 at Hunan Agriculture University together with Nanjing Tech University, Fudan University and University of Technology, Sydney.

 
Cleaning up electromagnetic pollution by containing the emissions with a thin coating of a nanomaterial called MXene

MXene is a nanomaterial that is both thin and light, but also has the unique ability to block and absorb electromagnetic radiation, which makes it the perfect for use as shielding in electronics devices.

 According to the authors, when electromagnetic waves come in contact with MXene, some are immediately reflected from its surface, while others pass through the surface but they lose energy amidst the material’s atomically thin layers.

 
Beijing University of Chemical Technology awarded prof. Yury Gogotsi, Drexel University (USA) the title of Honorary Professor

Honorary Professor appointment ceremony at the Beijing University of Chemical TechnologyBeijing University of Chemical Technology have decided to award prof. Yury Gogotsi, Drexel University (USA) the title of Honorary Professor based on his distinguished academic accomplishments. 

 
Prof. Yury Gogotsi became the winner of 2016 Nano Energy Award!

prof. Yury Gogotsi, Drexel UniversityNano Energy Award was presented to prof. Yury Gogotsi at 2016 Nanoenergy and Nanosystems Conference, which was held in Beijing on 13-15 July 2016.