Performance Improvement in Direct Methanol Fuel Cells by Using CaTiO3-δ Additive at the Cathode

Mazzapioda, Lucia; Vecchio, Carmelo Lo; Aricò, A.S.; Navarra, Maria Assunta; Baglio, V.

doi:10.3390/catal9121017

Cited by 12 publications

(21 citation statements)

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“…These results could be still attributed to the presence of oxygen defects on the CeO 2 structure which can create new oxygen adsorption pathway on the metal-oxide particles surface promoting the oxygen reduction reaction to proceed through the four-electron reduction pathway. [51] In accordance with the ECSA data reported in Table 1, we have recognized the composite Pt/C : CeO 2 1 : 1 sample as the most active catalyst among all those here investigated.…”

Section: Resultssupporting

confidence: 89%

Super Hygroscopic Non‐Stoichiometric Cerium Oxide Particles as Electrode Component for PEM Fuel Cells

et al. 2023

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The design of highly efficient promoters for the oxygen reduction reaction (ORR) is an important challenge in the largescale distribution of proton exchange membrane (PEM) fuel cells. Hygroscopic cerium oxide (CeO 2 ) is here proposed as cocatalyst in combination with Pt. Physical chemical characterizations, by means of X-ray diffraction, vibrational spectroscopy, morphological and thermal analyses, were carried out, demonstrating high water affinity of the synthesized CeO 2 nanoparticles. Composite catalysts (i. e., Pt : CeO 2 1 : 0.5 and 1 : 1 wt: wt), were studied by either rotating disk electrode (RDE) and fuel cell tests performed at 80 °C and 110 °C. Interestingly, the cell adopting the Pt : CeO 2 1 : 0.5 catalyst enabled the achievement of high power densities reaching ~80 and ~35 mW cm À 2 under low relative humidity and high temperatures. This result demonstrates that tuning material surface properties (e. g. oxygen vacancies) could significantly boost the electrochemical performance of cathodes as a combined result of optimized water retention and improved ORR kinetic.

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Section: Resultssupporting

confidence: 89%

Super Hygroscopic Non‐Stoichiometric Cerium Oxide Particles as Electrode Component for PEM Fuel Cells

et al. 2023

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“…Yang et al [ 43 ] reported a study about an ultra-thin nickel oxide rich in oxygen vacancies, demonstrating that the presence of these oxygen defects can enhance the methanol oxidation reaction (MOR) performance. Furthermore, as reported in our previous work [ 20 ], it was demonstrated that CTO could improve the methanol oxidation if it is used as additive to Pt/C catalyst, confirming a promoting effect of the perovskite for this reaction.…”

Section: Resultsmentioning

confidence: 99%

Composite Nafion-CaTiO3-δ Membranes as Electrolyte Component for PEM Fuel Cells

et al. 2020

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Manufacturing new electrolytes with high ionic conductivity has been a crucial challenge in the development and large-scale distribution of fuel cell devices. In this work, we present two Nafion composite membranes containing a non-stoichiometric calcium titanate perovskite (CaTiO3−δ) as a filler. These membranes are proposed as a proton exchange electrolyte for Polymer Electrolyte Membrane (PEM) fuel cell devices. More precisely, two different perovskite concentrations of 5 wt% and 10 wt%, with respect to Nafion, are considered. The structural, morphological, and chemical properties of the composite membranes are studied, revealing an inhomogeneous distribution of the filler within the polymer matrix. Direct methanol fuel cell (DMFC) tests, at 110 °C and 2 M methanol concentration, were also performed. It was observed that the membrane containing 5 wt% of the additive allows the highest cell performance in comparison to the other samples, with a maximum power density of about 70 mW cm−2 at 200 mA cm−2. Consequently, the ability of the perovskite structure to support proton carriers is here confirmed, suggesting an interesting strategy to obtain successful materials for electrochemical devices.

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“…The addition of iridium produced an enhancement of the electrocatalytic activity, together with a reduction of hydrogen peroxide production. In the work of Mazzapioda et al [3], a nonstoichiometric calcium titanate CaTiO 3-δ (CTO) was synthesized and used as an oxygen reduction reaction co-catalyst (together with Pt/C) in direct methanol fuel cells (DMFCs). The presence of the CTO additive promoted the oxygen reduction reaction (ORR) due to the presence of oxygen vacancies as available active sites for oxygen adsorption in the lattice.…”

Section: This Special Issuementioning

confidence: 99%