Performance and degradation studies of RuO2–Ta2O5 anode electrocatalyst for high temperature PBI based proton exchange membrane water electrolyser

Natarajan, V.; Basu, Suddhasatwa

doi:10.1016/j.ijhydene.2015.07.041

Cited by 16 publications

(16 citation statements)

References 33 publications

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“…In the composite membranes, the vibrational modes associated with Ta 2 O 5 are observed in the range 950–400 cm −1 as shown in Figure . [ 34 ] In the spectrum of FPK/(Ta 2 O 5 ) 0.0066 , there are no significant changes with respect to those of FPK in both quaternized and non‐quaternized forms (see Figure S3, Supporting Information). However, the membrane FPK/(Ta 2 O 5 ) 0.016 with a higher amount of filler reveals following features: i) a new band is observed at 1673 cm −1 which is attributed to the C═C vibration of the keto‐enol form of the backbone, ii) a general decrease in the intensity of the bands associated with the side chains and backbone chain as shown in Figure 2 as a result of conformational changes of the FPK backbone.…”

Section: Resultsmentioning

confidence: 99%

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Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Alvi

Vezzù

Pagot

et al. 2022

Macro Chemistry & Physics

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New inorganic-organic hybrid anion exchange membranes are produced after incorporation of tantalum oxide into trimethylammonium-functionalized polyethylene pyrrole-co-polyethylene ketone (functionalized polyketone, FPK), obtained by the chemical modification of a polyketone polymer. The influence of tantalum oxide fillers on the properties of the synthesized membranes is investigated. The interaction between inorganic fillers and the polymer chains is studied using Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR). The thermal analysis of the FPK membranes reveals they are thermally stable at up to 250°C. However, the incorporation of the inorganic fillers reduces the thermal stability. Modulated Differential Scanning Calorimetry (MDSC) results indicate that the inclusion of inorganic fillers leads to an increase in crystallinity. This study reports that the properties of the bulk polymer can be tuned by controlling the degree of functionalization and content of inorganic fillers, as confirmed by Near Ambient Pressure X-Ray Photoelectron Spectroscopy (NAP-XPS) studies. Finally, Broadband Electrical Spectroscopy (BES) studies demonstrate that the hybrid membranes are characterized by several polarization phenomena contributing to the overall ion conductivity of the material, which at RT is of 1.46 and 1.61 mS cm −1 for the FPK cast membrane and the hybrid membrane with 5.0 wt.% of Ta 2 O 5 filler, respectively.

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Section: Resultsmentioning

confidence: 99%

“…Figure2 [34]. In the spectrum of FPK/(Ta 2 O 5 ) 0.0066 , there are no significant changes with respect to those of FPK in both quaternized and non-quaternized forms (see FigureS3, Supporting Information).…”

mentioning

confidence: 92%

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Alvi

Vezzù

Pagot

et al. 2022

Macro Chemistry & Physics

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“…A number of scanning procedures, including point, line, or box scans, as well as elemental maps, which provide more detailed information regarding the homogeneity and particle type, are possible (Figure ). EDX analysis of fresh and tested MEAs can provide important information on dissolution and segregation . To obtain a good comparison, the same area (by identical location SEM (IL‐SEM) or scanning the whole MEA) must be sampled in both cases, as the catalyst concentration may vary across the surface .…”

Section: Following Degradation By Materials Characterization and In Smentioning

confidence: 99%

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

et al. 2017

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This Review addresses the technical challenges, scientific basis, recent progress, and outlook with respect to the stability and degradation of catalysts for the oxygen evolution reaction (OER) operating at electrolyzer anodes in acidic environments with an emphasis on ion exchange membrane applications. First, the term "catalyst stability" is clarified, as well as current performance targets, major catalyst degradation mechanisms, and their mitigation strategies. Suitable in situ experimental methods are then evaluated to give insight into catalyst degradation and possible pathways to tune OER catalyst stability. Finally, the importance of identifying universal figures of merit for stability is highlighted, leading to a comprehensive accelerated lifetime test that could yield comparable performance data across different laboratories and catalyst types. The aim of this Review is to help disseminate and stress the important relationships between structure, composition, and stability of OER catalysts under different operating conditions.

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“…Considering the highly oxidative environment on the anode side, the conversion of RuO 2 and IrO 2 into higher valence oxides (e.g., RuO 3 and RuO 4 ) can be prevented by the incorporation of stabilizers, such as Ta 2 O 5 , 290 whereas the typically utilized Pt/C on the cathode side exhibited an adequate reductive resistance. 299 The agglomeration and dissolution of catalyst powders are also promoted at elevated working temperature and cause an obvious reduction of the ECSA.…”

Section: Stability and Degradation Of Et-pemecsmentioning

confidence: 99%

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

Zhang

Liu

et al. 2023

Chem. Rev.

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Since severe global warming and related climate issues have been caused by the extensive utilization of fossil fuels, the vigorous development of renewable resources is needed, and transformation into stable chemical energy is required to overcome the detriment of their fluctuations as energy sources. As an environmentally friendly and efficient energy carrier, hydrogen can be employed in various industries and produced directly by renewable energy (called green hydrogen). Nevertheless, large-scale green hydrogen production by water electrolysis is prohibited by its uncompetitive cost caused by a high specific energy demand and electricity expenses, which can be overcome by enhancing the corresponding thermodynamics and kinetics at elevated working temperatures. In the present review, the effects of temperature variation are primarily introduced from the perspective of electrolysis cells. Following an increasing order of working temperature, multidimensional evaluations considering materials and structures, performance, degradation mechanisms and mitigation strategies as well as electrolysis in stacks and systems are presented based on elevated temperature alkaline electrolysis cells and polymer electrolyte membrane electrolysis cells (ET-AECs and ET-PEMECs), elevated temperature ionic conductors (ET-ICs), protonic ceramic electrolysis cells (PCECs) and solid oxide electrolysis cells (SOECs).

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Performance and degradation studies of RuO2–Ta2O5 anode electrocatalyst for high temperature PBI based proton exchange membrane water electrolyser

Cited by 16 publications

References 33 publications

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

Inorganic‐Organic Hybrid Anion Conducting Membranes Based on Ammonium‐Functionalized Polyethylene Pyrrole‐Polyethylene Ketone Copolymer

The Stability Challenges of Oxygen Evolving Catalysts: Towards a Common Fundamental Understanding and Mitigation of Catalyst Degradation

Water Electrolysis toward Elevated Temperature: Advances, Challenges and Frontiers

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