Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Badreldin, Ahmed; Abusrafa, Aya E.; Abdel‐Wahab, Ahmed

doi:10.1007/s42247-020-00123-z

Cited by 49 publications

(40 citation statements)

References 122 publications

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“…In Fe-free electrolyte, Fe-NiO x H y exhibited a continuous decrease of Fe in the electrode. In electrolyte containing 0.1 ppm 57 Fe, although the dissolution rate of 56 Fe in the electrode was the same as that in Fe-free electrolyte, 57 Fe in the electrode increased at a similar rate to 56 Fe loss. Ascribed to the dynamic exchange of Fe dissolution and redeposition, the overall Fe content was constant throughout the experiments.…”

Section: Electrolytementioning

confidence: 85%

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

et al. 2021

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including solar, wind, hydro, and biofuel, are highly desired to reduce our reliance on fossil fuels. However, according to the data provided by International Energy Agency, the global energy demand is 120 Mtoe in 2019, most (80%) of which was derived from fossil fuels (coal, natural gas, oil), leading to a huge CO 2 emission (33Gt in 2019). [1][2][3] One of the difficulties hindering the widespread use of these renewable energy sources is their intermittent and unpredictable nature. [4,5] Electrochemical reaction, a promising strategy for converting intermittent electricity into chemical energy, can produce a wide variety of important fuels and chemical feedstock, including hydrogen, hydrocarbons and ammonia. [6][7][8] The feedstocks for these productions obtained from electrochemical reactions can be offered by abundant and universal source, such as water, carbon dioxide and nitrogen. In last decades, due to the net-zero carbon emission features, electrochemical reactions have initiated extensive investigations based on water splitting reaction, nitrogen reduction reaction (NRR) and carbon dioxide reduction reaction. [9][10][11][12] In these green technologies, electrocatalytic oxygen evolution reaction (OER), a core reaction of these process, has a direct impact on device efficiency and cost effectiveness (Figure 1). [13,14] However, OER involves multistep four-electron transferring steps associated with OH breaking and OO formations, thus suffering from sluggish kinetics and requiring a high energy loss (high potential). Therefore, efficient and stable OER electrocatalysts are required to make these renewable energy storage/conversion processes to be viable and scalable technologies. [15,16,221,222] The OER catalysts can be classified into two categories: [17,18] molecular catalysts for homogeneous system and solid catalysts for heterogeneous system. In the homogeneous catalytic system, the molecular catalysts and the electrolyte are in solution, and the OER takes place in the liquid phase. The performance of molecular OER catalysts can be explained and understood at a molecular level by many relatively simple spectroscopic physicochemical techniques. Based on the mechanistic understanding at a molecular level, their geometric and electronic properties are much easier to be fine-tuned to achieve optimum performance by careful selection of the metal ion and ligand environment. Despite all these advantages, molecular catalysts are still not appropriate to be used in practical Electrocatalytic oxygen evolution reaction (OER), an important electrode reaction in electrocatalytic and photoelectrochemical cells for a carbonfree energy cycle, has attracted considerable attention in the last few years. Metal oxides have been considered as good candidates for electrocatalytic OER because they can be easily synthesized and are relatively stable during the OER process. However, inevitable structural variations still occur to them due to the complex reaction steps and harsh working conditions of OER, thus impending the ...

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Section: Electrolytementioning

confidence: 85%

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

et al. 2021

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“…The onset potential of 1.55 V is gradually increased and no further activity is observed for α-Fe2O3 NPs and TiO2 when using the single-channel electrocatalysts, as shown in Figure 5a,b. It is clear from this finding that the formation is inherently more efficient at improving the electron transport and improving the interaction between Fe and TiO2 by the higher electronic conductivity of Ti and surface area [24]. The better performance of FeTiO3 is due to Ti, which can be supported to avoid the further oxidation of Fe during the OER process.…”

Section: Resultsmentioning

confidence: 90%

FeTiO3 Perovskite Nanoparticles for Efficient Electrochemical Water Splitting

et al. 2021

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The use of water splitting has been investigated as a good alternate for storing electrical energy. While the general interest in developing non-toxic, high-performance, and economically feasible catalysts for oxygen evolution reaction (OER) is noteworthy, there is also significant interest in water splitting research. Recently, perovskite-type oxides have performed as an alternative to non-precious metal catalysts and can act as a new class of effective catalysts in water splitting systems. Herein, a perovskite-structured FeTiO3 was prepared via a facile one-step solvothermal method using ionic liquid as templates. The results of structural and morphological studies have supported the formation of FeTiO3 perovskite. Furthermore, FeTiO3 perovskite demonstrated OER activity with a lower onset potential of 1.45 V vs. RHE and Tafel slope value of 0.133 V.dec−1 at 1 M KOH solution using mercury/mercurous oxide (Hg/HgO) were used as working electrodes.

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“…In recent years, many efforts have been made to design low-cost, high-catalytic, stable, and environmentally friendly non-noble metal or carbon-based electrocatalysts. Perovskite oxides (ABO 3 −δ) have been widely studied as electrocatalysts owing to their composition and structural flexibility [7][8][9][10]. Perovskite oxides (ABO 3 ) also have a variety of structures and physical and chemical properties, which have attracted considerable interest for use in OER.…”

Section: Introductionmentioning

confidence: 99%

Sm-Eu Co-Doped BiFeO3 Nanoparticles With Superabsorption and Electrochemical Oxygen Evolution Reaction

Huang

Guo

et al. 2022

Front. Phys.

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Bi0.95Sm0.05Fe1−xEuxO3 (x = 0, 0.05, 0.10, 0.15) nanoparticles were prepared via a two-solvent sol–gel method. The X-ray diffraction (XRD) and Raman results suggested that the main phase of the samples gradually evolved from perovskite phase R3c to orthorhombic phase Pbnm with increasing Eu content and that the optical band gap gradually narrowed from 2.09 to 1.70 eV. Along with the structural change, the ferromagnetic properties were transformed, and interesting double hysteresis loops were observed for the sample where x = 0.1. All the bismuth ferrite (BFO) samples demonstrated extremely strong adsorbability, with the adsorption rate of refractory methyl orange reaching 90% in 5 min. These samples also exhibited superior oxygen evolution reaction (OER) performance, with a desirable onset potential of approximately 1.50 V vs. RHE. For the sample where x = 0.15, to support a current density of 100 mA/cm2, an overpotential of only 294 mV was required, which is much better than that of pure Ni foam (330 mV). More experiments are needed to verify and explore the source and mechanism of the OER performance.

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Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Cited by 49 publications

References 122 publications

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

Structural Variations of Metal Oxide‐Based Electrocatalysts for Oxygen Evolution Reaction

FeTiO3 Perovskite Nanoparticles for Efficient Electrochemical Water Splitting

Sm-Eu Co-Doped BiFeO3 Nanoparticles With Superabsorption and Electrochemical Oxygen Evolution Reaction

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