Dual In Situ Laser Techniques Underpin the Role of Cations in Impacting Electrocatalysts. Issue 24 (19th April 2022)

• Record Type: Journal Article
• Authors: Hou, Shujin; Xu, Lili; Ding, Xing; Kluge, Regina M.; Sarpey, Theophilus Kobina; Haid, Richard W.; Garlyyev, Batyr; Mukherjee, Soumya; Warnan, Julien; Koch, Max; Zhang, Shengli; Li, Weijin; Bandarenka, Aliaksandr S.; Fischer, Roland A.
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 24(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-19
• Subjects: Cation Effect -- Laser-Induced Current Transient -- Oxygen Evolution Reaction -- Raman Spectroscopy -- Surface-Mounted Metal–Organic Frameworks; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202201610
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Understanding the electrode/electrolyte interface is crucial for optimizing electrocatalytic performances. Here, we demonstrate that the nature of alkali metal cations can profoundly impact the oxygen evolution activity of surface‐mounted metal–organic framework (SURMOF) derived electrocatalysts, which are based on NiFe(OOH). In situ Raman spectroscopy results show that Raman shifts of the Ni−O bending vibration are inversely proportional to the mass activities from Cs + to Li + . Particularly, a laser‐induced current transient technique was introduced to study the cation‐dependent electric double layer properties and their effects on the activity. The catalytic trend appeared to be closely related to the potential of maximum entropy of the system, suggesting a strong cation impact on the interfacial water layer structure. Our results highlight how the electrolyte composition can be used to maximize the performance of SURMOF derivatives toward electrochemical water splitting. Abstract : In situ Raman spectroscopy and the laser‐induced current transient (LICT) technique elucidated the fact that the nature of alkali metal cations can significantly influence the oxygen evolution activity of surface‐mounted metal–organic framework derived NiFe(OOH) electrocatalyst, following the order of Cs + >K + >Na + >Li + .