Stability and Degradation of Perovskite Electrocatalysts for Oxygen Evolution Reaction

Bick, D.; Kindsmüller, Andreas; Staikov, G.; Gunkel, Felix; Müller, Dennis; Schneller, Theodor; Waser, Rainer; Valov, Ilia

doi:10.1016/j.electacta.2016.09.116

Cited by 30 publications

(26 citation statements)

References 28 publications

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“…Based on prior studies 5,8,18,[21][22][23][24]34,35 , we propose the possible basic models for the variations of electrocatalyst surface triggered by ion leaching effects during OER in alkaline solutions here.…”

Section: Resultsmentioning

confidence: 99%

Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

et al. 2020

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Ion leaching from pure-phase oxygen-evolving electrocatalysts generally exists, leading to the collapse and loss of catalyst crystalline matrix. Here, different from previous design methodologies of pure-phase perovskites, we introduce soluble BaCl 2 and SrCl 2 into perovskites through a self-assembly process aimed at simultaneously tuning dual cation/anion leaching effects and optimizing ion match in perovskites to protect the crystalline matrix. As a proofof-concept, self-assembled hybrid Ba 0.35 Sr 0.65 Co 0.8 Fe 0.2 O 3-δ (BSCF) nanocomposite (with BaCl 2 and SrCl 2) exhibits the low overpotential of 260 mV at 10 mA cm-2 in 0.1 M KOH. Multiple operando spectroscopic techniques reveal that the pre-leaching of soluble compounds lowers the difference of interfacial ion concentrations and thus endows the host phase in hybrid BSCF with abundant time and space to form stable edge/face-sharing surface structures. These self-optimized crystalline structures show stable lattice oxygen active sites and short reaction pathways between Co-Co/Fe metal active sites to trigger favorable adsorption of OH − species.

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Section: Resultsmentioning

confidence: 99%

Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

et al. 2020

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“…Nevertheless, it is essential to highlight that the degradation mechanism is also driven by kinetics. Hence, each perovskite catalyst would reach the end of its service life through different pathways based on the defect chemistry under the OER conditions [2,12,43]. In the light of above findings, the incorporation of Fe seems to impede the rate of degradation, where the one with the highest Fe composition (i.e., PBCF55) showed the most enhanced potential stability.…”

Section: Stability Jmentioning

confidence: 91%

“…All of the prepared layer perovskites revealed similar Brunauer-Emmett-Teller (BET) surface areas (Table S1), which shows that their differences in electrochemical activities are independent of their differences in surface area. As previous studies emphasize the importance of understanding the stabilities of electrode materials [2,[41][42][43], the potential stability test was conducted during which steady-state currents are recorded as potential is stepped from 1.0 VRHE to 1.6 VRHE holding for 10 seconds at each potential for 500 cycles (Figure 3b). Here, the Fe-doping also showed a beneficial effect in functional stability where PBCF55 revealed the least amount of current density loss over the period of cycles (lost 32% of its initial current density), while PBC lost about 74%.…”

Section: Electrochemical Studymentioning

confidence: 99%

Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ: Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stability

et al. 2019

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Perovskite oxides have been gaining attention for its capability to be designed as an ideal electrocatalyst for oxygen evolution reaction (OER). Among promising candidates, the layered double perovskite—PrBaCo2O6-δ (PBC)—has been identified as the most active perovskite electrocatalyst for OER in alkaline media. For a single transition metal oxide catalyst, the addition of Fe enhances its electrocatalytic performance towards OER. To understand the role of Fe, herein, Fe is incorporated in PBC in different ratios, which yielded PrBaCo2(1-x)Fe2xCo6-δ (x = 0, 0.2 and 0.5). Fe-doped PBCF’s demonstrate enhanced OER activities and stabilities. Operando X-ray absorption spectroscopy (XAS) revealed that Co is more stable in a lower oxidation state upon Fe incorporation by establishing charge stability. Hence, the degradation of Co is inhibited such that the perovskite structure is prolonged under the OER conditions, which allows it to serve as a platform for the oxy(hydroxide) layer formation. Overall, our findings underline synergetic effects of incorporating Fe into Co-based layered double perovskite in achieving a higher activity and stability during oxygen evolution reaction.

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“…[6][7][8][9] It is, however, still questionable whether they can provide adequate performance over time at operating conditions. The double z E-mail: jenqui@dtu.dk perovskite Pr x Ba 1-x CoO 3 (PBCO) [8][9][10][11] has been suggested as both an active and stable electrocatalyst at standard conditions with comparable electrocatalytic activity to the state-of-the-art materials IrO 2 and RuO 2 . [12][13][14] A study, utilizing cyclic voltammetry to determine stability of PCBO at 80 • C in 1 M KOH, showed that the performance of a 100 nm layer drops after less than 12 hours.…”

mentioning

confidence: 99%

Oxygen Evolution Activity and Chemical Stability of Ni and Fe Based Perovskites in Alkaline Media

Adolphsen

Sudireddy

Gil

et al. 2018

J. Electrochem. Soc.

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toward the oxygen evolution reaction (OER) was measured in 1M KOH at room temperature. All materials showed comparable OER activity with Tafel slopes in the range 56-98 mV/dec. The overvoltage at 10 mA • cm −2 , measured on a well-defined geometric surface area, was in the range 0.38-0.45 V. The best performing materials among the ones investigated were LaNiO 3 (multiphase) and La 2 Ni 0.9 Fe 0.1 O 4 . The chemical stability of the stoichiometric materials was also assessed in 31wt% and 45 wt% KOH respectively at 100 • C and 220 • C. All materials were partially decomposed after 1 week of exposure at 220 • C. After 1 week of exposure at 100 • C LaNiO 3 had formed secondary phases whereas LaNi 0.6 Fe 0.4 O 3 and La 2 Ni 0.9 Fe 0.1 O 4 showed only traces of secondary phase. The main secondary phases were in all cases La(OH) 3 , NiO, Ni(OH) 2 and Fe 2 O 3 . These observations indicate that the investigated oxygen electrode materials are not suitable for operation in alkaline electrolysis cells above 100 • C.

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Stability and Degradation of Perovskite Electrocatalysts for Oxygen Evolution Reaction

Cited by 30 publications

References 28 publications

Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

Utilizing ion leaching effects for achieving high oxygen-evolving performance on hybrid nanocomposite with self-optimized behaviors

Fe-Doping in Double Perovskite PrBaCo2(1-x)Fe2xO6-δ: Insights into Structural and Electronic Effects to Enhance Oxygen Evolution Catalyst Stability

Oxygen Evolution Activity and Chemical Stability of Ni and Fe Based Perovskites in Alkaline Media

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