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α-ZrP Nanoreinforcement Overcomes the Trade Off Between Phosphoric Acid Dopability and Thermomechanical Properties: Nanocomposite HTPEM with Stable Fuel Cell Performance.

08:00 EDT 12th September 2019 | BioPortfolio

Summary of "α-ZrP Nanoreinforcement Overcomes the Trade Off Between Phosphoric Acid Dopability and Thermomechanical Properties: Nanocomposite HTPEM with Stable Fuel Cell Performance."

In recent times, high temperature polymer electrolyte membranes (HTPEM) have emerged as viable alternatives to the Nafion based low temperature operated PEMFCs. This is owing to their higher tolerance to fuel impurities, efficient water management and higher cathode kinetics. However, the most efficacious HTPEMs such as poly(benzimidazole) (PBI) or 2,5 poly(benzimidazole) (ABPBI), which rely on extent of phosphoric acid (PA) doping level for fuel cell performance, suffer from poor mechanical properties at higher acid doping levels and dopant leaching during continuous operation. In order to overcome these issues, we report the synthesis of ABPBI membranes and fabrication of ABPBI/α-ZrP based nanocomposite membranes by an ex situ methodology using methane sulfonic acid as the solvent. The incorporation of hydrophilic α-ZrP into the membrane resulted in higher dopability of PA (6.5 moles) and proton conductivity (46 mS/cm-1) of the membranes (10 wt% of α-ZrP) as against the corresponding values of 3.6 moles and 27 mScm-1, respectively for the pristine membrane. More remarkably, these property improvements could be achieved while simultaneously augmenting the thermo-mechanical properties and oxidative stability of the membranes. The unit cell tests showed a marked improvement in the maximum power density for the nanocomposite membrane (335 mW/cm2 at 10 wt.% α-ZrP content) over the pristine ABPBI membrane (200 mW/cm2). We also report for the first time the feasibility of a 100 W HTPEMFC stack operated with the nanocomposite membrane with an active area of 39 cm2. The HTPEMFC stack delivered a stable voltage and power output, with a voltage drop rate of 0.84 µV/h over a run time of 730 h.

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This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
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Medical and Biotech [MESH] Definitions

Inorganic derivatives of phosphoric acid (H3PO4). Inorganic salts are known as PHOSPHATES and organic esters are PHOSPHORIC ACID ESTERS.

Amide derivatives of phosphoric acid such as compounds that include the phosphoric triamide (P(=O)(N)(N)(N)) structure.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a serine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and serine and 2 moles of fatty acids.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to an ethanolamine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and ethanolamine and 2 moles of fatty acids.

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