Wet‐Spun PEDOT/CNT Composite Hollow Fibers as Flexible Electrodes for H₂O₂ Production**

Abstract

The electrochemical synthesis of hydrogen peroxide (H 2 O 2 ) using the oxygen reduction reaction (ORR) requires highly catalytic active, selective, and stable electrode materials to realize a green and efficient process. The present publication shows for the first time the application of a facile one-step bottom-up wet-spinning approach for the continuous fabrication of stable and flexible tubular poly(3,4-ethylene dioxythiophene) (PEDOT : PSS) and PEDOT : PSS/carbon nanotube (CNT) hollow fibers. Additionally, electrochemical experiments reveal the catalytic activity of acid-treated PEDOT : PSS and its composites in the ORR forming hydrogen peroxide for the first time. Under optimized conditions, the composite electrodes with 40 wt % CNT loading could achieve a high production rate of 0.01 mg/min/cm 2 and a current efficiency of up to 54 %. In addition to the high production rate, the composite hollow fiber has proven its long-term stability with 95 % current retention after 20 h of hydrogen peroxide production.

Conducting Polymer‐Based e‐Refinery for Sustainable Hydrogen Peroxide Production

“…[ [25][26][27][28][29][30] The key difference between the molecular systems, such as conducting polymers, and atomic crystals, [31][32][33][34] such as graphitic materials and metals, is the absence or the presence of the unsaturated valences on the surface respectively. This results in a ground-level distinction of electrocatalytic reactions on conducting polymers manifested by the absence of chemosorbed species on surface.…”

PEDOT:PSS‐CNT Composite Particles Overcome Contact Resistances in Slurry Electrodes for Flow‐Electrode Capacitive Deionization

“…Contrary to NIPS, exposure of PEDOT:PSS to strong acids, including sulfuric acid (H 2 SO 4 ) can additionally enhance central mechanical and electrochemical material properties such as Young modulus, capacitance, or conductivity, which can be utilized to improve the performance of the material system in various applications. [ 36–38 ]…”

“…Contrary to NIPS, exposure of PEDOT:PSS to strong acids, including sulfuric acid (H 2 SO 4 ) can additionally enhance central mechanical and electrochemical material properties such as Young modulus, capacitance, or conductivity, which can be utilized to improve the performance of the material system in various applications. [36][37][38] Our process of producing PEDOT:PSS and PEDOT:PSS-CNT particles is based on the emulsification of a disperse PEDOT:PSS base-solution (DP) in a continuous 1-octanol phase (CP) applying a simple cannula-based nozzle system (Figure 1). The resulting millimeter-sized precursor droplets are transferred into a coagulation bath of 5 vol.% H 2 SO 4 and 95 vol.% isopropanol (IPA), where the CP shell is separated from the DP droplet by density difference.…”

Phosphorus doped hierarchical porous carbon: an efficient oxygen reduction electrocatalyst for on-site H2O2 production

“…The electrochemical oxygen reduction reaction via the twoelectron pathway (2e − ORR) has been proven to be a promising alternative strategy for on-site production of H 2 O 2 , [9][10][11][12] and the key challenge lies in the development of electrocatalysts with high activity, selectivity, and stability. 13,14 Nowadays, various state-of-the-art catalysts have been developed to realize 2e − ORR, including noble metals and alloys (Au, 15 Pt, 16 Pt-Hg, 17 Pd-Au 18 ), transition metals and compounds (Fe, 19 Co 20 ), and carbon-based materials.…”