Abacwaningi bethule isu elisha lokuthuthukisa umsebenzi we-catalytic usebenzisa i-tungsten suboxide njenge-single-atom catalyst (SAC). Leli su, elithuthukisa kakhulu ukusabela kwe-hydrogen evolution (HER) kuplatinamu yensimbi (pt) ngezikhathi ze-16.3, linikeza ukukhanya ekuthuthukisweni kobuchwepheshe obusha be-electrochemical catalyst.

I-Hydrogen iye yaphakanyiswa njengenye indlela ethembisayo esikhundleni sezinto zokubasa ezimbiwa phansi. Kodwa-ke, izindlela eziningi ezivamile zokukhiqiza i-hydrogen ezimbonini ziza nezindaba zemvelo, zikhipha amanani abalulekile e-carbon dioxide namagesi abamba ukushisa.

Ukuhlukaniswa kwamanzi nge-electrochemical kuthathwa njengendlela engaba khona yokukhiqiza i-hydrogen ehlanzekile. I-Pt ingenye yama-catalyst asetshenziswa kakhulu ukuthuthukisa ukusebenza kwe-HER ekuhlukaniseni amanzi e-electrochemical, kodwa izindleko eziphezulu kanye nokushoda kwe-Pt kuhlala kuyizithiyo eziyinhloko ekusetshenzisweni kokuthengisa okukhulu.

Ama-SAC, lapho zonke izinhlobo zensimbi zihlakazwa ngazodwana ezintweni ezisekelayo ezifiselekayo, akhonjwe njengendlela eyodwa yokunciphisa inani lokusetshenziswa kwe-Pt, njengoba enikeza inani eliphezulu lama-athomu e-Pt avele endaweni.

Ligqugquzelwe izifundo zangaphambili, ezazigxile kakhulu kuma-SAC asekelwa izinto ezisekelwe kukhabhoni, ithimba labacwaningi be-KAIST eliholwa nguSolwazi Jinwoo Lee ovela eMnyangweni Wezamakhemikhali Nobunjiniyela be-Biomolecular laphenya umthelela wezinto ezisekelayo ekusebenzeni kwama-SAC.

USolwazi Lee kanye nabacwaningi bakhe baphakamise i-mesoporous tungsten suboxide njengento entsha yokusekela i-Pt ehlakazekile nge-athomu, njengoba lokhu bekulindeleke ukuthi kunikeze ukuqhutshwa kwe-elekthronikhi okuphezulu futhi kube nomthelela we-synergetic ne-Pt.

Baqhathanise ukusebenza kwe-Pt ye-athomu eyodwa esekelwa i-carbon ne-tungsten suboxide ngokulandelanayo. Imiphumela yembula ukuthi umphumela wokusekela wenzeka nge-tungsten suboxide, lapho umsebenzi omkhulu we-athomu ye-athomu eyodwa esekelwe i-tungsten suboxide wawuphindwe izikhathi ezingu-2.1 kune-Pt ye-athomu eyodwa esekelwe i-carbon, futhi izikhathi ezingu-16.3 ziphakeme kune-Pt. ama-nanoparticles asekelwa ikhabhoni.

Ithimba libonise ushintsho kusakhiwo sikagesi se-Pt ngokudluliswa kwenkokhiso ukusuka ku-tungsten suboxide ukuya ku-Pt. Lesi simo sabikwa njengomphumela wokusebenzelana okuqinile kokusekelwa kwensimbi phakathi kwe-Pt ne-tungsten suboxide.

Ukusebenza kwe-HER kungathuthukiswa hhayi kuphela ngokushintsha isakhiwo se-elekthronikhi sensimbi esekelwe, kodwa futhi ngokufaka omunye umphumela wokusekela, umphumela we-spillover, iqembu locwaningo libike. I-Hydrogen spillover isenzakalo lapho i-hydrogen ekhangiswayo isuka kwenye indawo iye kwenye, futhi kwenzeka kalula njengoba usayizi we-Pt uba mncane.

Abacwaningi baqhathanisa ukusebenza kwe-athomu eyodwa ye-Pt ne-Pt nanoparticles esekelwe i-tungsten suboxide. I-Pt ene-athomu eyodwa esekelwa i-tungsten suboxide ibonise izinga eliphezulu le-hydrogen spillover phenomenon, ethuthukise umsebenzi we-Pt mass we-hydrogen evolution kuze kufike izikhathi ezingu-10.7 uma kuqhathaniswa nama-Pt nanoparticles asekelwa i-tungsten suboxide.

USolwazi Lee uthe, “Ukukhetha izinto ezifanele zokusekela kubalulekile ekuthuthukiseni i-electrocatalysis ekukhiqizeni i-hydrogen. I-tungsten suboxide catalyst ebesiyisebenzisa ukusekela i-Pt ocwaningweni lwethu isho ukuthi ukusebenzisana phakathi kwensimbi efaniswe kahle nokusekelwa kungathuthukisa kakhulu ukusebenza kahle kwenqubo. "