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Solid electrolyte interphase (SEI) crucially affects the rate performance and cycling lifespan, yet to date more extensive research is still needed in potassium‐ion batteries. We report an ultra‐thin and KF‐enriched SEI triggered by tuned fluorinated surface design in electrode. Our results reveal that fluorination engineering alters the interfacial chemical environment to facilitate inherited electronic conductivity, enhance adsorption ability of potassium, induce localized surface polarization to guide electrolyte decomposition behavior for SEI formation, and especially, enrich the KF crystals in SEI by self‐sacrifice from C−F bond cleavage. Hence, the regulated fluorinated electrode with generated ultra‐thin, uniform, and KF‐enriched SEI shows improved capacity of 439.3 mAh g−1 (3.82 mAh cm−2), boosted rate performance (202.3 mAh g−1 at 8.70 mA cm−2) and durable cycling performance (even under high loading of ~8.7 mg cm−2). We expect this practical engineering principle to open up new opportunities for upgrading the development of potassium‐ion batteries. [ABSTRACT FROM AUTHOR]

Solid electrolyte interphase (SEI) crucially affects the rate performance and cycling lifespan, yet to date more extensive research is still needed in potassium-ion batteries. We report an ultra-thin and KF-enriched SEI triggered by tuned fluorinated surface design in electrode. Our results reveal that fluorination engineering alters the interfacial chemical environment to facilitate inherited electronic conductivity, enhance adsorption ability of potassium, induce localized surface polarization to guide electrolyte decomposition behavior for SEI formation, and especially, enrich the KF crystals in SEI by self-sacrifice from C-F bond cleavage. Hence, the regulated fluorinated electrode with generated ultra-thin, uniform, and KF-enriched SEI shows improved capacity of 439.3 mAh g -1 (3.82 mAh cm -2 ), boosted rate performance (202.3 mAh g -1 at 8.70 mA cm -2 ) and durable cycling performance (even under high loading of ~8.7 mg cm -2 ). We expect this practical engineering principle to open up new opportunities for upgrading the development of potassium-ion batteries., (© 2024 Wiley-VCH GmbH.)

Supported-adsorbents growing on the substrate in situ are equipped with the advantages of high adsorption capacity, excellent regeneration performance, and adaptability to complex wastewater. However, the effects of substrate on the adsorption properties of supported-adsorbent are rarely considered, which will hinder its development and scale-up applications. In this study, the influences of different substrates (Ti, Mo, W, CC) on the Ag + adsorption behavior of supported-MoS 2 adsorbents were investigated. The adsorption kinetics, adsorption mechanism, and the renewability of these supported-MoS 2 were compared orderly. As a result, MoS 2 grown on a tungsten substrate (MoS 2 -W) exhibits a remarkable adsorption capacity for Ag + (1.98 mg cm -2 and 598.80 mg g -1 ), which is 6.38-33 times more than the other three supported-MoS 2 . Moreover, the MoS 2 -W also possesses an ultrahigh distribution coefficient (24.80 mL cm -2 ) for Ag + , and the selection coefficient can reach 1984. XRD and electrochemical characterization analysis indicated that Ag + adsorption performance of supported-MoS 2 is positively correlated with the degree of its amorphous structure. Substrate W with the terrific electrical properties which may facilitate the disordered growth of MoS 2 , resulting in more active sites exposed, and endow MoS 2 -W with outstanding Ag + capture performance. Finally, the supported-MoS 2 retains a high removal efficiency of Ag +  after 5 cycles of adsorption and desorption. This study provides a novel perspective for promoting the practical application of supported-sorbents to recycle heavy metals., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Inc. All rights reserved.)