caa a22 4500 606195424 CHVBK 20210128100919.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10934-015-9940-x doi (NATIONALLICENCE)springer-10.1007/s10934-015-9940-x Sombatmankhong Korakot National Metal and Materials Technology Center, 114 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Nueng, 12120, Amphoe Khlong Luang, Pathum Thani, Thailand aut Improved performance and stability of direct borohydride fuel cells (DBFCs) with porous polypyrrole support [Elektronische Daten] [Korakot Sombatmankhong] This work focused on the development of a method to fabricate a multilayer macro/mesoporous polypyrrole (PPPr) support to provide a high surface area for catalyst deposition in a direct borohydride fuel cell (DBFC) using sodium borohydride as a fuel and hydrogen peroxide as an oxidant. The multilayer macroporous structure was constructed through simultaneous electropolymerisation of two-monomer mixture (i.e. pyrrole and methylene blue) on an NH4Cl salt template; poly(methylene blue) and NH4Cl were later selectively removed from the composite film as verified by FTIR. The SEM and TEM results demonstrated that a uniform distribution of polypyrrole particles was obtained with an apparent macroporous structure in a varied range of 18-65µm which consequently provided a well-dispersed and well-distributed Pt deposition. It was also apparent that the PPPr had a higher BET surface area by the introduction of macro/mesoporous structure as compared to the bulk polypyrrole sample (BPPr). In addition, the PPPr was highly electrically conducting with the surface conductivity of 9.6±0.8×101 Scm−1 and electrochemically active surface area of 5.4cm2, which were increased to 42.5±0.9×101 Scm−1 and 30.0cm2 respectively with the presence of Pt catalyst within the PPPr-Pt sample. The application of PPPr-Pt to DBFC was shown to have an excellent electrochemical stability and an improved power density of 2-fold and 3.6-fold higher than the BPPr and commercial Vulcan XC-72 carbon black respectively. By increasing fuel concentration to 0.3M and using counter flow operation, the DBFC using PPPr-Pt catalyst exhibited a maximum power density of 139 mWcm−2. Springer Science+Business Media New York, 2015 Direct borohydride fuel cells nationallicence Conducting polymers nationallicence Polypyrrole nationallicence Electropolymerisation nationallicence Porous structure nationallicence n : The charge number of the reaction nationallicence c : Analyte concentration nationallicence A : Electrically active surface area nationallicence D : Analyte diffusion coefficient nationallicence Ν : Potential scan rate nationallicence i p : Peak current nationallicence PEMFC : Proton exchange membrane fuel cell nationallicence DBFC : Direct borohydride fuel cell nationallicence OCP : Open circuit potential nationallicence PBS : Phosphate buffer saline nationallicence Au : Gold nationallicence BJH : Barrett-Joyner-Halenda nationallicence BPPr : Bulk polypyrrole nationallicence FTIR : Fourier transform infrared nationallicence SEM : Scanning electron microscopy nationallicence TMPD : N,N,N′,N′-tetramethyl-p-phenylenediamine nationallicence TBAP : Tetrabutylammonium perchlorate nationallicence Pt : Platinum nationallicence PPPr : Multilayer macro/mesoporous polypyrrole nationallicence MEA : Membrane electrode assemblies nationallicence BET : Brunauer-Emmett-Teller analysis nationallicence TEM : Transmission electron microscopy nationallicence MB : Methylene blue nationallicence PMB : Poly(methylene blue) nationallicence PPr/PMB : Polypyrrole/poly(methylene blue) nationallicence CB : Carbon black nationallicence CB-Pt : CB deposited with Pt catalyst nationallicence BPPr-Pt : BPPr film deposited with Pt catalyst nationallicence PPPr-Pt : PPPr film deposited with Pt nationallicence D p : Pore diammeter nationallicence SBET : BET surface area nationallicence BOR : Borohydride oxidation reaction nationallicence PEM : Proton exchange membrane nationallicence Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 675-687 1380-2224 22:3<675 2015 22 10934 https://doi.org/10.1007/s10934-015-9940-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10934-015-9940-x text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sombatmankhong Korakot National Metal and Materials Technology Center, 114 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Nueng, 12120, Amphoe Khlong Luang, Pathum Thani, Thailand aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 675-687 1380-2224 22:3<675 2015 22 10934