Study of Carbon Nanotube-Supported Platinum Nanocatalyst Fabricated with Sodium Formate Reducing Agent in Ethylene Glycol Suspension

Abstract

A simple method to prepare a durable, low platinum-loading catalyst layer for the cathode in a proton exchange membrane fuel cell is tested and described. Multiwalled carbon nanotubes (MWCNTs) are functionalized with citric acid and then suspended in ethylene glycol. Here, platinum nanoparticles (~4 nm) are loaded onto the surface of the MWCNTs after hexachloroplatinic acid is reduced by aqueous sodium formate. A peak performance of 813 mW⋅cm−2 was achieved with a total membrane electrode assembly (MEA) platinum catalyst loading of 0.2 mg⋅cm−2 (0.1 mg⋅cm−2 anode/0.1 mg⋅cm−2 cathode), in H2/O2 (ambient pressure), at 80°C, with a Nafion 212 membrane. Peak power density only decreased by 23% after 1500 potentials cycles (ranged from 0.1 to 1.2 V, and vice versa, with a 50 mV/s scan rate, flowing H2/N2 at 80°C). Transmission electron microscopy (TEM) images show the morphology and distribution of the platinum nanoparticles loaded onto the surface of the MWCNTs.

Removal of boron from aqueous solution using magnetic carbon nanotube improved with tartaric acid

“…Also, the higher amount of oxygen containing functional groups resulted in the dominance of acidic character in TA-MWCNTs comparing to MWCNTs [ 23 ]. Forming oxygen contained functional groups was also reported in previous works by modification of MWCNTs with citric acid [ 22 , 28 ]. Although, the chemistry of reaction between nanotubes and citric acid or tartaric acid at high temperatures is still unknown, it could be mentioned that functional groups formed on the surface of TA-MWCNTs can serve as attachment points in the construction of complexes between B(OH) 4 /B(OH) 4 - and TA-MWCNTs surface [ 29 , 30 ].…”

Functionalized platinum nanoparticles with surface charge trigged by pH: synthesis, characterization and stability studies

“…The role of the reducing agent has been studied and the effect of the widely used NaBH 4 has been compared with ammonium formiate (HCOONH 4 ) [37–38]. With this aim, maintaining the Pt/DEA ratio fixed at 1:0.5, the molar ratio between metal and reducing agent has been varied as follows: Pt/NaBH 4 1:5, 1:10, 1:20, 1:30, 1:40 and the results were compared with the effect of HCOONH 4 .…”

Rational Construction of Strongly Coupled Metal–Metal Oxide–Graphene Nanostructure with Excellent Electrocatalytic Activity and Durability

“…The Pt-SnO 2 –prGO electrocatalyst was prepared using the modified formate process. , First, 20 mg of SnO 2 –prGO hybrid was dispersed into 20 mL of ethylene glycol (EG) by ultrasonication. Then, a predetermined amount of H 2 PtCl 6 aqueous solution was dropwise added.…”