How to Probe Structure, Kinetics, and Dynamics at Complex Interfaces In Situ and Operando by Optical Spectroscopy

Erbe, Andreas; Nayak, Simantini; Chen, Ying‐Hsuan; Niu, Fang; Pander, Marc; Tecklenburg, Stefanie; Toparlı, Çiğdem

doi:10.1016/b978-0-12-409547-2.14061-2

Cited by 14 publications

(13 citation statements)

References 166 publications

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“…Mn oxide, which had been electrochemically deposited on FTO, was investigated in these different electrolytes toward OER. According to the Pourbaix diagram (Figure a) and based on different methods, − at potentials of lower than 0.6 V (throughout the remaining sections, all potentials are reported vs reversible hydrogen electrode (RHE) reference electrode) and even at cathodic ones, Mn(OH) 2 is stable. Also, Mn(OH) 3 – as a soluble ion could also be formed under these conditions.…”

Section: Resultsmentioning

confidence: 99%

Surprisingly Low Reactivity of Layered Manganese Oxide toward Water Oxidation in Fe/Ni-Free Electrolyte under Alkaline Conditions

et al. 2022

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So far, many studies on the oxygen-evolution reaction (OER) by Mn oxides have been focused on activity; however, the identification of the best performing active site and corresponding catalytic cycles is also of critical importance. Herein, the real intrinsic activity of layered Mn oxide toward OER in Fe/Ni-free KOH is studied for the first time. At pH ≈ 14, the onset of OER for layered Mn oxide in the presence of Fe/Ni-free KOH happens at 1.72 V (vs reversible hydrogen electrode (RHE)). In the presence of Fe ions, a 190 mV decrease in the overpotential of OER was recorded for layered Mn oxide as well as a significant decrease (from 172.8 to 49 mV/decade) in the Tafel slope. Furthermore, we find that both Ni and Fe ions increase OER remarkably in the presence of layered Mn oxide, but that pure layered Mn oxide is not an efficient catalyst for OER without Ni and Fe under alkaline conditions. Thus, pure layered Mn oxide and electrolytes are critical factors in finding the real intrinsic activity of layered Mn oxide for OER. Our results call into question the high efficiency of layered Mn oxides toward OER under alkaline conditions and also elucidate the significant role of Ni and Fe impurities in the electrolyte in the presence of layered Mn oxide toward OER under alkaline conditions. Overall, a computational model supports the conclusions from the experimental structural and electrochemical characterizations. In particular, substitutional doping with Fe decreases the thermodynamic OER overpotential up to 310 mV. Besides, the thermodynamic OER onset potential calculated for the Fe-free structures is higher than 1.7 V (vs RHE) and, thus, not in the stability range of Mn oxides.

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Section: Resultsmentioning

confidence: 99%

Surprisingly Low Reactivity of Layered Manganese Oxide toward Water Oxidation in Fe/Ni-Free Electrolyte under Alkaline Conditions

et al. 2022

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“…Photoluminescence Spectroscopy involves illuminating the material with photons and measuring the photoluminescence (emitted light) in response to the excitation. It provides information about the material’s luminescent properties, recombination processes, and defect states. − …”

Section: Characterization Techniques Of Nlo Materialsmentioning

confidence: 99%

Advances in Solid-State Nonlinear Optical Materials: From Fundamentals to Applications

Aslam,

Doane,

Yeung

et al. 2023

ACS Appl. Opt. Mater.

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Nonlinear optical (NLO) materials are an interesting class of compounds that have found application in many aspects of our ordinary lives. Solid-state NLO materials can be classified into organic, inorganic, and hybrid. This brief review article has the aim of introducing the readers to the fundamental principles of nonlinear optics while focusing on the inorganic solid-state NLO materials with an emphasis on their structural peculiarities, synthetic methods, and applications. The materials will be grouped by their intended spectral application: mid-and far-IR (chalcogenides, halides, and pnictides), near-IR and visible ranges (KDP, KTP and iodates), and UV and deep-UV (borates, carbonates, nitrates, and phosphates). Among the compounds that are discussed, several classes are highlighted: promising IR compounds with wide band gaps (E g > 3.5 eV) with second harmonic generation (SHG) coefficients comparable to industry standard AgGaS 2 (d ij ≥ 1 × AGS) suitable for mid-IR NLO applications, NLO compounds that can meet commercial requirements in the vis-NIR and UV regions, and deep-UV materials with even wider band gaps (E g > 6.2 eV) and SHG coefficients surpassing those of traditional KH 2 PO 4 crystals (d ij ≥ 1 × KDP). Several prevailing synthetic methods (solid-state, flux, and hydrothermal) are discussed, and different types of characterization techniques are presented. Finally, applications, ranging from lasers and quantum and neuromorphic computing to "uses beyond optics" in battery electrodes and ionic conductors are discussed. Although brief, we hope this review will provide valuable insights into the fast-expanding field of solid-state NLO materials.

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“…26,27 Two studies have investigated FFC in situ, 31 or quasi in situ, 10 by infrared spectroscopy on aluminium. In situ and operando vibrational spectroscopy gives on the other hand significant advantages for obtaining direct insight into reactions mechanisms and processes, 32,33 such as the study of solvation, 34,35 reaction intermediates in electrocatalysis or corrosion, [36][37][38][39] oxides forming in electrocatalytical processes, [40][41][42] corrosion and oxidation products, [43][44][45][46][47][48] cathodic delamination, 49 or corrosion inhibitors. 50,51 Raman spectroscopy as a vibrational spectroscopic method in a confocal microscope combines the possibility of optical imaging with information related to chemical composition of corrosion products on the mm length scale; it can be applied in the field, 52 and is a popular tool, e.g.…”

Section: Introductionmentioning

confidence: 99%

Role of aluminium hydrides in localised corrosion of aluminium revealed by operando Raman spectroscopy

Mysliu

Lunder

Erbe

2023

Phys. Chem. Chem. Phys.

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How to Probe Structure, Kinetics, and Dynamics at Complex Interfaces In Situ and Operando by Optical Spectroscopy

Cited by 14 publications

References 166 publications

Surprisingly Low Reactivity of Layered Manganese Oxide toward Water Oxidation in Fe/Ni-Free Electrolyte under Alkaline Conditions

Surprisingly Low Reactivity of Layered Manganese Oxide toward Water Oxidation in Fe/Ni-Free Electrolyte under Alkaline Conditions

Advances in Solid-State Nonlinear Optical Materials: From Fundamentals to Applications

Role of aluminium hydrides in localised corrosion of aluminium revealed by operando Raman spectroscopy

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