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Efficient Electrochemical Water Splitting with PdSn4 Dirac Nodal Arc Semimetal PdSn4</sub&gt； Dirac节弧半金属的高效电化学水分解

Figshare Pub Date : 2021-06-07 DOI: 10.1021/acscatal.1c01653.s001

DanilW. Boukhvalov (10932773), Chia-Nung Kuo (9121045), Silvia Nappini (1276620), Andrea Marchionni (10932776), Gianluca D’Olimpio (9121042), Jonathan Filippi (7022219), Silvia Mauri (10932779), Piero Torelli (1792603), Chin Shan Lue (9121048), Francesco Vizza (1404874), Antonio Politano (1401358)

{"title":"Efficient Electrochemical Water Splitting with PdSn4 Dirac Nodal Arc Semimetal","authors":"DanilW. Boukhvalov (10932773), Chia-Nung Kuo (9121045), Silvia Nappini (1276620), Andrea Marchionni (10932776), Gianluca D’Olimpio (9121042), Jonathan Filippi (7022219), Silvia Mauri (10932779), Piero Torelli (1792603), Chin Shan Lue (9121048), Francesco Vizza (1404874), Antonio Politano (1401358)","doi":"10.1021/acscatal.1c01653.s001","DOIUrl":"https://doi.org/10.1021/acscatal.1c01653.s001","url":null,"abstract":"Recently, severalnresearchers have claimed the existence of superiorncatalytic activity associated with topological materials belongingnto the class of Dirac/Weyl semimetals, owing to the high electronnconductivity and charge carrier mobility in these topological materials.nBy means of X-ray photoelectron spectroscopy, electrocatalytic tests,nand density functional theory, we have investigated the chemical reactivityn(chemisorption of ambient gases), ambient stability, and catalyticnproperties of PdSn4, a topological semimetal showing Diracnnode arcs. We find a Tafel slope of 83 mV in the hydrogen evolutionnreaction (HER) dec–1 with an overpotential of 50nmV, with performances resembling those of pure Pd, regardless of itsnlimited amount in the alloy, with a subsequent reduction in the costnof raw materials by ∼80%. Remarkably, the PdSn4-basednelectrode shows superior robustness to CO compared to pure Pd andnPt and high stability in water media, although the PdSn4 surface is prone to oxidation with the formation of a sub-nanometricnSnO2 skin. Moreover, we also assessed the significancenof the role of topological electronic states in the observed catalyticnproperties. Actually, the peculiar atomic structure of oxidized PdSn4 enables the migration of hydrogen atoms through the Sn–Onlayer with a barrier comparable with the energy cost of the Heyrovskynstep of HER over Pt(111) in acidic media (0.1 eV). On the other hand,nthe topological properties play a minor role, if existing, contrarilynto the recent reports overestimating their contribution in catalyticnproperties.","PeriodicalId":522759,"journal":{"name":"Figshare","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147902955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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