TY - JOUR
T1 - A microtubular all CNT gas diffusion electrode
AU - Gendel, Youri
AU - Roth, Hannah
AU - Rommerskirchen, Alexandra
AU - David, Oana
AU - Wessling, Matthias
N1 - Funding Information:
This research was funded by the German Federal Ministry of Education andResearch (BMBF) under the project Tubulair ± .
Funding Information:
Prof. Matthias Wessling appreciates the financial support of the Alexander von Humboldt Foundation.
PY - 2014/9
Y1 - 2014/9
N2 - We report a microtubular gas diffusion electrodes made of multi-walled carbon nanotubes (MWCNT). The electrodes were prepared by inside-out cake filtration of an aqueous MWCNT suspension onto a microfiltration hollow fiber (HF) membrane, followed by washing out the surfactant, drying and removal of the all CNT microtube from the HF membrane. Length, outer diameter, and wall thickness of the tubular electrodes are: up to 44 cm, ∼ 1.7 mm and 275 μm, respectively. The BET surface area is 200 m2/g with a porosity of 48-67% and an electrical conductivity of ∼ 20 S/cm. Application of this microtubular Gas Diffusion Electrodes (GDE) was studied for the oxygen reduction reaction (ORR) in divided and undivided electrochemical cells. Oxygen supply into the lumen of the tubular electrodes resulted in much higher current densities for ORR than in experiments where the electrolyte was saturated by bubbling with pure oxygen. Within the 0.25-1.0 bar pressure (gauge) region, higher ORR rates were achieved at lower pressure. We also show that H 2O2 production is possible using the new GDE. We propose to use such novel electrodes for the fabrication of tubular electrochemical reactors, e.g. fuel cells, H2O2 generators, CO2 reduction and other processes that involve GDE application.
AB - We report a microtubular gas diffusion electrodes made of multi-walled carbon nanotubes (MWCNT). The electrodes were prepared by inside-out cake filtration of an aqueous MWCNT suspension onto a microfiltration hollow fiber (HF) membrane, followed by washing out the surfactant, drying and removal of the all CNT microtube from the HF membrane. Length, outer diameter, and wall thickness of the tubular electrodes are: up to 44 cm, ∼ 1.7 mm and 275 μm, respectively. The BET surface area is 200 m2/g with a porosity of 48-67% and an electrical conductivity of ∼ 20 S/cm. Application of this microtubular Gas Diffusion Electrodes (GDE) was studied for the oxygen reduction reaction (ORR) in divided and undivided electrochemical cells. Oxygen supply into the lumen of the tubular electrodes resulted in much higher current densities for ORR than in experiments where the electrolyte was saturated by bubbling with pure oxygen. Within the 0.25-1.0 bar pressure (gauge) region, higher ORR rates were achieved at lower pressure. We also show that H 2O2 production is possible using the new GDE. We propose to use such novel electrodes for the fabrication of tubular electrochemical reactors, e.g. fuel cells, H2O2 generators, CO2 reduction and other processes that involve GDE application.
KW - Gas diffusion electrode
KW - Oxygen reduction
KW - Tubular electrode
KW - n/a OA procedure
UR - http://www.scopus.com/inward/record.url?scp=84903513884&partnerID=8YFLogxK
U2 - 10.1016/j.elecom.2014.06.006
DO - 10.1016/j.elecom.2014.06.006
M3 - Article
AN - SCOPUS:84903513884
SN - 1388-2481
VL - 46
SP - 44
EP - 47
JO - Electrochemistry communications
JF - Electrochemistry communications
ER -
