Tribochemical reactions of erionite and Na-LTA zeolites with Fe2(SO4)3.5H2O: A mössbauer study

Martínez, José Daniel; Aguila, Carlos Diaz; Bertrán, José Fernández; Ruiz, Enrique; Vergara, Cecilia; Malherbe, R Roque

doi:10.1007/bf02418611

Cited by 4 publications

(1 citation statement)

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“…In this case, the spectra were fitted with a distribution of sextets and a broad central doublet to account for the iron oxides and their superparamagnetic behavior of very small particles, while the distribution of sextets and two doublets was used in the spectrum of the sulfur modified sample. In S-Fe 2 O 3 -OXL the isomer shift and quadrupole splitting values of the doublets are consistent with Fe 2 (SO 4 ) 3 • 5H 2 O; 34 however, the relative areas of the doublets do not match those of pure Fe 2 (SO 4 ) 3 •5H 2 O, 34 with an extra intensity in the inner (lowest quadrupole splitting) doublet, which may be assigned to the superparamagnetic contribution of iron oxides. Using the spectral area of the outer (largest quadrupole splitting) doublet as pure Fe 2 (SO 4 ) 3 •5H 2 O, we can estimate a sulfur to iron atomic ratio of 15 ≈ 23%, in good agreement with the results of AE and ICP of 22.7% (Table 1).…”

Section: Resultsmentioning

confidence: 84%

Iron Electrodes Based on Sulfur-Modified Iron Oxides with Enhanced Stability for Iron–Air Batteries

Villanueva

Alegre

Rubín

et al. 2022

ACS Appl. Energy Mater.

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Iron–air systems are a very promising technology with the potential to become one of the cheapest and safest energy storage solutions of the future. However, iron anodes still face some challenges like passivation, resulting in loss of capacity, due to the formation of nonconductive species during cycling as well as the hydrogen evolution reaction, a parasitic reaction interfering with the charging of the electrode. In the present work these two issues are addressed: Sulfur-modified mesoporous iron oxides are obtained and used as hot-pressed negative electrodes for alkaline iron–air batteries. Iron electrodes present average capacity values between 400 and 500 mA h g Fe –1 for ∼100 h of operation, the S-modified iron oxides being the most stable ones. An exponential deactivation model fitting the discharge capacity of the different electrodes compared to the number of cycles was proposed. According to the model, the best of the electrodes loses less than 0.5% of its capacity per cycle. Furthermore, doubling the charge and discharge rates allows increasing both the discharge capacity and the Coulumbic efficiency, though at the expense of stability. This manuscript proves that the proper distribution of sulfur on the surface of the iron oxide is fundamental to suppress the HER and passivation, enhancing the stability of the electrode. These properties were further corroborated in long test-runs which comprised more than 400 h of charging and discharging.

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Section: Resultsmentioning

confidence: 84%