Bron, M.

Ehrenberg, H.

Erler, Th.

Komp, A.

Kühhirt, M.

Langner, J.

Melke, J.

Neumann, C.

Nikolowski, K.

Otter, M.

Roth, C.

Schimpf, S.

Zils, S.

English

KITopen

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association Redox-flow batteries with robust 3D-structured carbon based electrodes Institute for Applied Materials Energy Storage Systems (IAM-ESS) Motivation: • 2D-Phase boundaries result in an inhomogeneous electrochemical reaction area with poor space utilization • Activity of electrode material has to be improved • Long term stability of electrode material and its surface is poorly evaluated Composite Electrode Silica Template PAN-Fiber Carbon non-woven Porocarb Infiltration with Carbon precursor Carbonization Removal of the Carbon precursor Production of the non-woven fabric Carbonization Test bench Treatment Electrochemical and structural Analysis Current [A] Potential vs. Ag/AgCl [V] Template based porous Carbon Porevolume 10nm - 1µm: 1,35 cc/g 25nm Range: 0,15 cc/g 250nm Range: 0,4 cc/g Macropore range: 0,8 cc/g Aim: • Distinct adjustment of the pore size distribution for RFB-applications • Graphitized carbon containing meso- and macropores and (optionally micropores) Production of electrodes with 3D-structure Aim: • Homogenous distribution of the Porocarb and good adhesion towards the nonwoven  1 Results • TP-conductivity under compression are in the same range as reference materials • With higher porosity leading to a better permeability at the same conductivity  Modification of the Carbon materials and their characterization V3+ V2+ • Generating functional surface groups • Analysis (EC, Raman, XPS, TEM,...) • Activity determination • In situ-Diagnostic/Aging Results: Improvement of the carbon materials redox-properties with N/O-surface groups Single cell test and characterization Coordination: Prof. C. Roth (FUB) Prof. H. Ehrenberg Dr. K. Nikolowski J. Langner, Dr. J. Melke  Co-Coordination: Dr. C. Neumann Dr. M. Otter Partner: Dr. Ansgar Komp Dr. S. Zils Partner: Prof. M. Bron Dr. S. Schimpf Th. Erler M. Kühhirt  Aim of the FLOW 3D project: • Material and structural design: Optimization of space utilization through distinct porosity and the distribution of the carbon material • Method development: Systematic characterization and 2D/3D imaging  • Understanding: Influence of morphology and surface properties on the activity and stability Special Thanks for the Funding: German Federal Ministry of Education and Research (BMBF) (Nr.: 03EK3011A) • Imaging (SEM, TEM, FIB-SEM) • Analysis (ZV, Raman, NEXAFS, XRD/PDF, XPS)  Results: • Non-woven fabric reaches performance comparable to literature  • Porocarb shows a very good el.chem. behaviour   -0,004-0,00200,0020,0040,4 0,6 0,8 1 1,2 1,4Current [A]  Potential vs. NHE [V] Heraeus Porocarb Freudenberg Material• Testbench (pH, pressure, half-cell potential)   UI linie von Faser 2  

Redox-flow batteries with robust 3D-structured carbon based electrodes

https://publikationen.bibliothek.kit.edu/220092527/3816355

Redox-flow batteries with robust 3D-structured carbon based electrodes

Abstract

Similar works

Full text

Available Versions

KITopen