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Science Bulletin 2024年第8期69卷 1100-1108页

作者：张意达马镇涛杨绍康王青雨刘利民柏彧饶德伟王功名李洪良郑旭升 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China College of Chemistry and Materials Science Experimental Center of Engineering and Material ScienceUniversity of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

Catalytic conversion of nitrate(NO_(3)^(-))pollutants into ammonia(NH_(3))offers a sustainable and promising route for both wastewater treatment and NH_(3)*** cations are prevalent in nitrate solutions,but their roles beyond charge balance in catalytic NO_(3)^(-)conversion have been generally ***,we report the promotion effect of K^(+)cations in KNO_(3)solution for NO_(3)^(-)reduction over a TiO_(2)-supported Ni single-atom catalyst(Ni_(1)/TiO_(2)).For photocatalytic NO_(3)^(-)reduction reaction,Ni_(1)/TiO_(2)exhibited a 1.9-fold NH_(3)yield rate with nearly 100%selectivity in KNO_(3)solution relative to that in NaNO_(3)*** studies reveal that the K^(+)cations from KNO_(3)gradually bonded with the surface of Ni_(1)/TiO_(2),in situ forming a K-O-Ni moiety during reaction,whereas the Na^(+)ions were unable to interact with the catalyst in NaNO_(3)*** charge accumulation on the Ni sites induced by the incorporation of K atom promoted the adsorption and activation of NO_(3)^(-).Furthermore,the K-O-Ni moiety facilitated the multiple proton-electron coupling of NO_(3)^(-)into NH_(3)by stabilizing the intermediates.

关键词： Nitrate reduction alkali cations Potassium Ni single-atom catalyst Ammonia

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Effect of cation(Li^+, Na^+, K^+, Rb^+, Cs^+) in aqueous electrolyte on the electrochemical redox of Prussian blue analogue(PBA) cathodes

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Journal of Energy Chemistry 2020年第1期29卷 31-38,I0002页

作者： Satyajit Phadke Roman Mysyk Meriem Anouti Laboratoire PCM2E Universite de ToursBatiment JParc de Grandmont37200 ToursFrance Parque Tecnologico C/Albert Einstein 48 CP01510 MilanoAlavaSpain

Prussian blue analogue(PBA)material is a promising cathode for applications in Na-ion and K-ion batteries which can support high c-rates for charge and *** this study,the material of composition[K2 CuIIFeII(CN)6]was synthesized and its structural and electrochemical redox behavior was investigated with 5 different alkali insertion cations(Li^+,Na^+,K^+,Rb^+,Cs^+).Galvanostatic measurements indicate that the redox potential strongly depends on the ionic radius of the inserted *** redox potential varies by 400 m V between using Li^+(0.79A)or Cs^+(1.73A)in the *** underlying modification of the Fe2^+/Fe3^+redox potential in PBA is proposed to be due to the weakening of the Fe–C bond in the *** hypothesis is supported by XRD measurements which reveal that the lattice parameter of the de-intercalated host structure follows the same trend of monotonic increase with the cation *** relatively minor volume changes accompanying the redox(1.2%–2.4%)allow the PBA to accommodate differently sized cations,although the structural hindrances are quite pronounced at high c-rates for the larger ones(Rb^+and Cs^+).Cycle aging studies indicate that the minimum capacity fade rate is observed in case of K^+ and Rb^+ containing *** peak intensity corresponding to the[220]crystallographic plane varies depending on the state of charge of PBA,since this plane contains the insertion *** to the sensitivity of the redox potential to the insertion cation coupled with the observed fast ion-exchange ability,the PBA material may find additional analytical applications such as ion sensing or filtration devices.

关键词： Prussian blue Cathode alkali cations XRD Batteries

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