In situ studies of energy-related electrochemical reactions using Raman and X-ray absorption spectroscopy

Chen, Hengquan; Zou, Lie; Wei, Di‐Ye; Zheng, Lingling; Wu, Yuan‐Fei; Zhang, Hua; Li, Jianfeng

doi:10.1016/s1872-2067(21)63874-3

Cited by 44 publications

(19 citation statements)

References 103 publications

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“…Despite the seemingly simple process of alkaline HOR, direct spectral evidence for the aforementioned mechanisms has long been lacking, especially for the confirmation of potential adsorbed intermediates. In situ spectroscopic techniques are powerful tools to verify the existence of intermediates under reaction conditions. , Very recently, Wang et al . exploited in situ Raman spectroscopy to reveal the structure and dissociation process of interfacial water for hydrogen evolution reaction (HER, the reverse reaction of HOR, both of which generally obey similar catalytic laws) in alkaline media .…”

Section: Mechanisms Of Hor In Alkaline Mediamentioning

confidence: 99%

“…Accurate characterizations of HOR catalysts contribute to probing the adsorption sites and monitoring the local atomic-structure evolution, providing nanostructural evidence for mechanism research. Different techniques including physical characterization, electrochemical measurements, and computational simulation should be combined together, especially advanced in situ / operando spectroscopic and electron microscopy techniques, such as in situ XRD, IR spectroscopy, Raman spectroscopy, XAS, as well as in situ XPS, TEM, STEM, etc . ,,, …”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…In situ spectroscopic techniques are powerful tools to verify the existence of intermediates under reaction conditions. 45,46 Very recently, Wang et al exploited in situ Raman spectroscopy to reveal the structure and dissociation process of interfacial water for hydrogen evolution reaction (HER, the reverse reaction of HOR, both of which generally obey similar catalytic laws) in alkaline media. 41 As shown in Figure 2a, the intensity of the 550 cm −1 band increased with decreasing potential, indicating that interfacial water was transformed from a random distribution to an ordered structure.…”

Section: Mechanisms Of Hor In Alkaline Mediamentioning

confidence: 99%

“…Different techniques including physical characterization, electrochemical measurements, and computational simulation should be combined together, especially advanced in situ/operando spectroscopic and electron microscopy techniques, such as in situ XRD, IR spectroscopy, Raman spectroscopy, XAS, as well as in situ XPS, TEM, STEM, etc. 45,46,200,201 Particular Attention to Mechanistic Studies on Ni-Based Catalysts. The research regarding the bifunctional theory on Ni-based catalysts should keep pace with the catalyst design.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

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Electrocatalytic Hydrogen Oxidation in Alkaline Media: From Mechanistic Insights to Catalyst Design

et al. 2022

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With the potential to circumvent the need for scarce and cost-prohibitive platinum-based catalysts in proton-exchange membrane fuel cells, anion-exchange membrane fuel cells (AEMFCs) are emerging as alternative technologies with zero carbon emission. Numerous noble metal-free catalysts have been developed with excellent catalytic performance for cathodic oxygen reduction reaction in AEMFCs. However, the anodic catalysts for hydrogen oxidation reaction (HOR) still rely on noble metal materials. Since the kinetics of HOR in alkaline media is 2–3 orders of magnitude lower than that in acidic media, it is a major challenge to either improve the performance of noble metal catalysts or to develop high-performance noble metal-free catalysts. Additionally, the mechanisms of alkaline HOR are not yet clear and still under debate, further hampering the design of electrocatalysts. Against this backdrop, this review starts with the prevailing theories for alkaline HOR on the basis of diverse activity descriptors, i.e., hydrogen binding energy theory and bifunctional theory. The design principles and recent advances of HOR catalysts employing the aforementioned theories are then summarized. Next, the strategies and recent progress in improving the antioxidation capability of HOR catalysts, a thorny issue which has not received sufficient attention, are discussed. Moreover, the significance of correlating computational models with real catalyst structure and the electrode/electrolyte interface is further emphasized. Lastly, the remaining controversies about the alkaline HOR mechanisms as well as the challenges and possible research directions in this field are presented.

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Section: Mechanisms Of Hor In Alkaline Mediamentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Section: Mechanisms Of Hor In Alkaline Mediamentioning

confidence: 99%

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

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Electrocatalytic Hydrogen Oxidation in Alkaline Media: From Mechanistic Insights to Catalyst Design

et al. 2022

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“…Raman spectroscopy, also as inelastic scattering, can identify structural information of molecules with Raman active vibrational modes [85,86]. To improve the Raman 1 3 intensity of necessarily and randomly adsorbed intermediates in ORR, the development of surface-enhanced Raman spectroscopy (SERS) or surface enhanced resonance Raman scattering (SERRS) is essential, especially in-situ Raman analysis [87,88].…”

Section: In-situ Raman Spectroscopymentioning

confidence: 99%

A Review of In-Situ Techniques for Probing Active Sites and Mechanisms of Electrocatalytic Oxygen Reduction Reactions

et al. 2022

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Electrocatalytic oxygen reduction reaction (ORR) is one of the most important reactions in electrochemical energy technologies such as fuel cells and metal–O2/air batteries, etc. However, the essential catalysts to overcome its slow reaction kinetic always undergo a complex dynamic evolution in the actual catalytic process, and the concomitant intermediates and catalytic products also occur continuous conversion and reconstruction. This makes them difficult to be accurately captured, making the identification of ORR active sites and the elucidation of ORR mechanisms difficult. Thus, it is necessary to use extensive in-situ characterization techniques to proceed the real-time monitoring of the catalyst structure and the evolution state of intermediates and products during ORR. This work reviews the major advances in the use of various in-situ techniques to characterize the catalytic processes of various catalysts. Specifically, the catalyst structure evolutions revealed directly by in-situ techniques are systematically summarized, such as phase, valence, electronic transfer, coordination, and spin states varies. In-situ revelation of intermediate adsorption/desorption behavior, and the real-time monitoring of the product nucleation, growth, and reconstruction evolution are equally emphasized in the discussion. Other interference factors, as well as in-situ signal assignment with the aid of theoretical calculations, are also covered. Finally, some major challenges and prospects of in-situ techniques for future catalysts research in the ORR process are proposed.

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Raman Spectroscopy

Guan,

Liao,

Sun

et al. 2024

Energy Storage Materials Characterization

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In situ studies of energy-related electrochemical reactions using Raman and X-ray absorption spectroscopy

Cited by 44 publications

References 103 publications

Electrocatalytic Hydrogen Oxidation in Alkaline Media: From Mechanistic Insights to Catalyst Design

Electrocatalytic Hydrogen Oxidation in Alkaline Media: From Mechanistic Insights to Catalyst Design

A Review of In-Situ Techniques for Probing Active Sites and Mechanisms of Electrocatalytic Oxygen Reduction Reactions

Raman Spectroscopy

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