Ofufuza adapereka njira yatsopano yolimbikitsira ntchito zothandizira pogwiritsa ntchito tungsten suboxide ngati chothandizira cha atomu imodzi (SAC). Njirayi, yomwe imapangitsa kuti hydrogen evolution reaction (HER) muzitsulo za platinamu (pt) ndi 16.3 times ikhale bwino, ikuwonetseratu chitukuko cha matekinoloje atsopano a electrochemical catalyst.

Hydrogen yanenedwa ngati njira yodalirika yosinthira mafuta oyambira pansi. Komabe, njira zambiri zopangira ma hydrogen m'mafakitale zimabwera ndi zovuta zachilengedwe, kutulutsa mpweya wochuluka wa carbon dioxide ndi mpweya wowonjezera kutentha.

Kugawikana kwamadzi a electrochemical kumawonedwa ngati njira yomwe ingatheke kupanga ma hydrogen oyera. Pt ndi imodzi mwazinthu zomwe zimagwiritsidwa ntchito kwambiri kuti zithandize HER ntchito yogawanitsa madzi a electrochemical, koma mtengo wapamwamba ndi kusowa kwa Pt kumakhalabe zopinga zazikulu pakugwiritsa ntchito malonda ambiri.

Ma SAC, pomwe mitundu yonse yazitsulo imamwazikana pachothandizira chomwe chimafunidwa, azindikirika ngati njira imodzi yochepetsera kuchuluka kwa kugwiritsa ntchito Pt, chifukwa amapereka kuchuluka kwa ma atomu a Pt owonekera.

Molimbikitsidwa ndi maphunziro apakale, omwe makamaka amayang'ana pa ma SAC othandizidwa ndi zinthu zopangidwa ndi kaboni, gulu lofufuza la KAIST lotsogozedwa ndi Pulofesa Jinwoo Lee wochokera ku dipatimenti ya Chemical and Biomolecular Engineering adafufuza momwe zida zothandizira zimagwirira ntchito ma SAC.

Pulofesa Lee ndi ofufuza ake adanenanso kuti mesoporous tungsten suboxide ngati chida chatsopano chothandizira Pt yomwazika ndi atomiki, chifukwa izi zimayembekezeredwa kuti zipereke mawonekedwe apamwamba amagetsi komanso kukhala ndi synergetic ndi Pt.

Iwo anayerekezera ntchito ya atomu imodzi Pt yothandizidwa ndi carbon ndi tungsten suboxide motsatana. Zotsatira zake zidawonetsa kuti chithandizo chothandizira chidachitika ndi tungsten suboxide, momwe ntchito yayikulu ya atomu imodzi ya Pt yothandizidwa ndi tungsten suboxide inali nthawi ya 2.1 kuposa ya atomu imodzi ya Pt yothandizidwa ndi kaboni, ndi nthawi 16.3 kuposa ya Pt. nanoparticles mothandizidwa ndi kaboni.

Gululi lidawonetsa kusintha kwamagetsi a Pt kudzera pa kusamutsa kwa tungsten suboxide kupita ku Pt. Chodabwitsa ichi chinanenedwa chifukwa cha mgwirizano wamphamvu wothandizira zitsulo pakati pa Pt ndi tungsten suboxide.

Kuchita kwa HER kungawongoleredwe osati kokha posintha mawonekedwe amagetsi azitsulo zothandizidwa, komanso poyambitsa chithandizo china, zotsatira za spillover, gulu lofufuza linanena. Hydrogen spillover ndi chodabwitsa chomwe adsorbed hydrogen amayenda kuchokera pamwamba kupita kwina, ndipo zimachitika mosavuta pamene kukula kwa Pt kumakhala kochepa.

Ofufuzawo anayerekezera ntchito ya atomu imodzi ya Pt ndi Pt nanoparticles yothandizidwa ndi tungsten suboxide. The single-atomu Pt mothandizidwa ndi tungsten suboxide anasonyeza apamwamba digiri wa haidrojeni spillover chodabwitsa, amene patsogolo Pt misa ntchito kwa hydrogen kusanduka kwa 10,7 nthawi poyerekeza Pt nanoparticles mothandizidwa ndi tungsten suboxide.

Pulofesa Lee adati, "Kusankha zida zoyenera ndizofunikira pakuwongolera ma electrocatalysis popanga haidrojeni. Chothandizira cha tungsten suboxide chomwe tidagwiritsa ntchito pothandizira Pt mu phunziro lathu chikutanthauza kuti kuyanjana pakati pa chitsulo chofananira bwino ndi kuthandizira kumatha kupititsa patsogolo ntchitoyo. "