Abaphandi babonise isicwangciso esitsha sokuphucula umsebenzi we-catalytic usebenzisa i-tungsten suboxide njenge-atom catalyst enye (SAC). Esi sicwangciso, esiphucula kakhulu i-hydrogen evolution reaction (HER) kwiplatinum yensimbi (pt) ngamaxesha e-16.3, inika ukukhanya ekuphuhliseni iteknoloji entsha ye-electrochemical catalyst.

I-Hydrogen igqalwa njengenye indlela ethembisayo kumafutha efosili. Nangona kunjalo, uninzi lweendlela eziqhelekileyo zokuvelisa i-hydrogen kwimizi-mveliso ziza kunye nemiba yokusingqongileyo, ikhupha izixa ezibalulekileyo zekharbon diokside kunye neegesi ze-greenhouse.

Ukwahlulwa kwamanzi nge-electrochemical kuthathwa njengendlela enokwenzeka yokuvelisa i-hydrogen ecocekileyo. I-Pt yenye yezona zinto zisetyenziswa ngokuqhelekileyo ukuphucula ukusebenza kwe-HER kwi-electrochemical water splitting, kodwa iindleko eziphezulu kunye nokunqongophala kwe-Pt zihlala ziyimiqobo engundoqo kwizicelo ezininzi zorhwebo.

Ii-SACs, apho zonke iindidi zesinyithi zisasazwa ngokukodwa kwizinto ezifunekayo zokuxhasa, zichongwe njengenye yeendlela zokunciphisa ubungakanani bokusetyenziswa kwe-Pt, njengoko zibonelela ngenani eliphezulu lee-athom ze-Pt eziveziweyo.

Iphefumlelwe kwizifundo zangaphambili, ezijolise kakhulu kwii-SAC ezixhaswa yi-carbon-based materials, iqela lophando lwe-KAIST elikhokelwa nguNjingalwazi uJinwoo Lee ovela kwiSebe leMichiza kunye ne-Biomolecular Engineering liphanda impembelelo yezixhobo zokuxhasa ekusebenzeni kwe-SACs.

UNjingalwazi uLee kunye nabaphandi bakhe bacebise i-mesoporous tungsten suboxide njengento entsha yenkxaso ye-atomically dispersed Pt, njengoko oku bekulindeleke ukuba kubonelele nge-electronic conductivity ephezulu kwaye ibe nefuthe le-synergetic kunye ne-Pt.

Bathelekisa ukusebenza kwe-atom enye ye-Pt exhaswa yi-carbon kunye ne-tungsten suboxide ngokulandelanayo. Iziphumo zibonise ukuba impembelelo yenkxaso yenzeke nge-tungsten suboxide, apho umsebenzi omkhulu we-atom ye-Pt exhaswa yi-tungsten suboxide yayingu-2.1 amaxesha amakhulu kune-atom enye ye-Pt exhaswa yi-carbon, kunye namaxesha e-16.3 aphezulu kune-Pt. iinanoparticles ezixhaswa yikhabhoni.

Iqela libonise utshintsho kwisakhiwo se-elektroniki se-Pt ngokudluliselwa kwentlawulo ukusuka kwi-tungsten suboxide ukuya kwi-Pt. Le nto ichazwe njengesiphumo sentsebenziswano eqinile yenkxaso yensimbi phakathi kwePt kunye ne-tungsten suboxide.

Ukusebenza kwe-HER kunokuphuculwa nje kuphela ngokuguqula isakhiwo se-elektroniki sensimbi exhaswayo, kodwa nangokubangela enye impembelelo yenkxaso, umphumo we-spillover, iqela lophando libike. I-Hydrogen spillover yinto apho i-adsorbed hydrogen ifuduka isuka komnye umgangatho iye komnye, kwaye yenzeka ngokulula njengoko ubukhulu be-Pt buba buncinci.

Abaphandi bathelekisa ukusebenza kwe-atom enye ye-Pt kunye ne-Pt nanoparticles exhaswa yi-tungsten suboxide. I-atom enye ye-Pt exhaswa yi-tungsten suboxide ibonise iqondo eliphezulu le-hydrogen spillover phenomenon, eyandisa umsebenzi we-Pt wobunzima be-hydrogen ukuya kumaxesha e-10.7 xa kuthelekiswa ne-Pt nanoparticles exhaswa yi-tungsten suboxide.

Unjingalwazi uLee uthe, "Ukukhetha izinto ezifanelekileyo zokuxhasa kubalulekile ekuphuculeni i-electrocatalysis kwimveliso ye-hydrogen. I-tungsten suboxide catalyst ebesiyisebenzisa ukuxhasa i-Pt kwisifundo sethu ithetha ukuba ukusebenzisana phakathi kwentsimbi ehambelana kakuhle kunye nenkxaso kunokuphucula kakhulu ukusebenza kakuhle kwenkqubo. "