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Non-bonding modulations between single atomic cerium and monodispersed selenium sites towards efficient oxygen reduction

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Nano Research 2024年第6期17卷 4753-4763页

作者： Leilei Yin Shuai Zhang Mingzi Sun Siyuan Wang Bolong Huang Yaping Du Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina

Currently,dual atomic catalysts(DACs)with neighboring active sites for oxygen reduction reaction(ORR)still meet lots of challenges in the synthesis,especially the construction of atomic pairs of elements from different blocks of the periodic ***,a“rare earth(Ce)-metalloid(Se)”non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect ***,the optimized Ce-Se diatomic catalysts(Ce-Se DAs/NC)displayed a half-wave potential of 0.886 V *** hydrogen electrode(RHE)and excellent stability,which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever *** addition,a primary zinc-air battery constructed using Ce-Se DAs/NC delivers a higher peak power density(209.2 mW·cm^(−2))and specific capacity(786.4 mAh·gZn^(−1))than state-of-the-art noble metal catalysts Pt/*** calculations reveal that the Ce-Se DAs/NC has improved the electroactivity of the Ce-N_(4)region due to the electron transfer towards the nearby Se specific activity(SA)***,the more electron-rich Se sites promote the adsorptions of key intermediates,which results in the optimal performances of ORR on Ce-Se DAs/*** work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.

关键词： catalyst rare earth oxygen reduction reaction(ORR) metalloid non-bonding modulation

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Heavy metal: a misused term?

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Acta Geochimica 2021年第3期40卷 466-471页

作者： Olivier Pourret Jean-Claude Bollinger Andrew Hursthouse Uni La Salle AGHYLE60000 BeauvaisFrance Faculte Des Sciences Et Techniques Universite de LimogesPEREINE87060 LimogesFrance School of Computing Engineering&Physical SciencesUniversity of the West of ScotlandPaisley PA12BEUK

The use of the term"heavy metal"is regularly questioned by the scientific ***,we followed the evolution(1970–2020)in the number of published papers including this term in their ***,we can evidence a continuous,albeit sometimes stabilizing,increase especially in environmental *** several other warning opinions,we propose that it should be replaced in the scientific literature by terms like"metal","metalloid","trace metal elements"or"potentially toxic element".

关键词： Heavy metals Trace metal elements Metal metalloid Potentially toxic elements

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Adverse effects induced by chromium Ⅵ, cadmium and arsenic exposure on hypothalamus-pituitary physiology

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BIOCELL 2016年第1期40卷 15-18页

作者： JIMENA P.CABILLA SONIA A.RONCHETTI BEATRIZ H.DUVILANSKI Instituto de Investigaciones Biomédicas(INBIOMED)UBA-CONICET Facultad de MedicinaUniversidad de Buenos AiresParaguay 215510°pisoCiudad Autónoma de Buenos AiresC1121ABGArgentina

Environmental contamination with some metalloids and heavy metals(M/HM)raises concern due to well known adverse effects on *** these pollutants,chromium VI(Cr VI),cadmium(Cd)and arse-nic(As)are frequently present as a result of natural sources or due to industrial *** are able to easily enter the organism and negatively affect many organs and *** vivo(exposure to Cr VI,Cd or As through drinking water)and in vitro experiments(primary pituitary cell cultures)were performed in male Wistar rats to address their actions on hypothalamus-pituitary *** the M/HM accumulated in hypothalamus and pi-tuitary gland and decreased pituitary cell viability and prolactin release mostly by generation of reactive oxygen species,since it was partially prevented by antioxidant *** the pituitary,they increased lipid peroxy-dation and the expression of several oxidative stress *** death was mainly due to caspase-dependent ***(prolactin-secreting cells)were the most affected pituitary ***-driven cell death was also partially calcium-and ***,Cd stimulated the production of low levels of nitric oxide which exerted cytoprotective *** results showed that these M/HM display deleterious actions in hypothalamic-pituitary physiology by altering hormone release and promoting cell death.

关键词： metalloid heavy metals cell death oxidative stress hormone release

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