Microwave Assisted Reduction of Pt-Catalyst by N-Phenyl-p-Phenylenediamine for Proton Exchange Membrane Fuel Cells

Abstract

Abstract:The presence of N-phenyl-p-phenylenediamine (PPDA: a dimer of aniline) during microwave (MW) irradiation can significantly improve Pt-loading on the XC72 carbon matrix as a catalyst support of proton exchange membrane fuel cells (PEMFCs). PPDA is converted to an emeraldine base state during MW-assisted redox reaction, which is characterized by both FTIR and Raman spectra. The increased degree of conjugation from the formation of quinone-state of PPDA is confirmed by UV-VIS spectra. TEM micrographs and residue weights obtained from the TGA thermograms illustrate the particle size and Pt-loading percent of Pt nanoparticles (NPs) after MW irradiation, respectively. X-ray diffraction patterns indicate Pt NPs are successfully loaded on XC72 by MW irradiation corresponding to hydrothermal method. The single cell performance demonstrates an increasing power and maximum current density when Pt-catalyst of membrane exchanged assembly (MEA) is prepared by MW-assisted reduction in the presence of PPDA.

Calcined Co(II)-Triethylenetetramine, Co(II)- Polyaniline-Thiourea as the Cathode Catalyst of Proton Exchanged Membrane Fuel Cell

“…The monomer of polyaniline (PANI) is aniline, which has a benzene ring and amine and can be polymerized very easily in an acidic aqueous solution within several hours. Some studies indicate if Pt is reduced on the PANI matrix, the obtained Pt/PANi demonstrates better electrochemical properties [ 3 , 4 , 5 , 6 , 7 ]. The obtained PANI are mainly composed of aromatics and can be used as a nitrogen source as well, which can be used to dope the metal-catalysts after calcination.…”

Degradation of Silicone Rubbers as Sealing Materials for Proton Exchange Membrane Fuel Cells under Temperature Cycling

“…Fuel cells are energy conversion devices which transfer the chemical energy of hydrogen and oxygen into electricity directly, and are regarded as renewable, promising and environment friendly energy sources [ 1 , 2 ]. Of different types of fuel cells developed, proton exchange membrane fuel cell (PEMFC) is considered to be the most promising and attractive candidate in portable and transportation applications due to the additional advantages of high energy density, fast start-ups and low operating temperature and it thus becomes the focus of research currently [ 3 , 4 ]. However, the durability and reliability of PEMFC are remain significant challenges for its commercial applications [ 5 , 6 , 7 ].…”

Preparation of Pt-Catalyst by Poly(p-phenylenediamine) Nanocomposites Assisted by Microwave Radiation for Proton Exchange Membrane Fuel Cell

“…Since XC72 is known to own carbonyl groups on the surfaces, lots of types of oligoanilines which can act as both reducing agents and MW absorbing materials are H-bonding with XC72 before the addition of alcohol solution of hydrogen hexachloroplatinate (IV) hexahydrate (H 2 PtCl 6 ·6H 2 O), followed by MW irradiation [20,21,22,23,24,25].…”

“…In our previous studies, N-phenyl-p-phenylenediamine (the simplest oligoaniline) was used as the reducing agent for Pt-catalyst prepared by MW irradiation [25]. It turned out to be successful and facile.…”