Vatsvaguri vakapa zano idzva rekusimudzira chiitiko checatalytic vachishandisa tungsten suboxide senge-atomu catalyst (SAC). Iri zano, iro rinonyanya kunatsiridza hydrogen evolution reaction (HER) musimbi platinamu (pt) ne 16.3 nguva, inovhenekera kuvandudzwa kwehunyanzvi hutsva hwemagetsi emagetsi.

Hydrogen yakaitwa seimwe nzira inovimbisa kune mafuta efossil. Nekudaro, mazhinji eakajairwa maindasitiri ehydrogen kugadzirwa nzira anouya nenyaya dzezvakatipoteredza, achiburitsa huwandu hwakakura hwekabhoni dhaidhirosi uye greenhouse magasi.

Electrochemical water splitting inoonekwa senzira inogona kuita yakachena kugadzirwa kwehydrogen. Pt ndechimwe chezvinonyanya kushandiswa kugadzirisa HER kushanda mu electrochemical mvura kupatsanurwa, asi mari yakakwirira uye kushomeka kwePt kunoramba kuri zvipingamupinyi zvakakosha kumashandisirwo emabhizimisi akawanda.

MaSAC, apo marudzi ese esimbi akaparadzirwa ega pachinhu chinodiwa chetsigiro, akaonekwa senzira imwe yekudzikisa huwandu hwekushandiswa kwePt, sezvo achipa huwandu hwepamusoro hwepamusoro hwePt maatomu.

Yakafuridzirwa nezvidzidzo zvekare, izvo zvakanyanya kutarisa maSAC anotsigirwa nekabhoni-based materials, boka rekutsvaga reKAIST rinotungamirirwa naProfessor Jinwoo Lee kubva kuDhipatimendi reKemikari neBiomolecular Engineering rakatsvaga pesvedzero yezvinyorwa zvekutsigira pakushanda kweSACs.

Muzvinafundo Lee nevaongorori vake vakakurudzira mesoporous tungsten suboxide sechinhu chitsva chekutsigira Pt yakaparadzirwa atomu, sezvo izvi zvaitarisirwa kupa yakakwira yemagetsi conductivity uye kuita synergetic nePt.

Vakafananidza kuita kweatomu imwe chete Pt inotsigirwa nekabhoni uye tungsten suboxide zvichiteerana. Zvigumisiro zvakaratidza kuti kutsigira kwakaitika ne tungsten suboxide, umo hukuru hwekuita kweatomu imwe chete Pt inotsigirwa ne tungsten suboxide yaiva 2.1 nguva huru kupfuura yeatomu imwe chete Pt inotsigirwa nekabhoni, uye 16.3 nguva yakakwirira kudarika Pt. nanoparticles inotsigirwa nekabhoni.

Chikwata chakaratidza shanduko mune yemagetsi chimiro chePt kuburikidza necharge transfer kubva ku tungsten suboxide kuenda kuPt. Ichi chiitiko chakashumwa semugumisiro wekubatana kwakasimba kwesimbi-rutsigiro pakati pePt uye tungsten suboxide.

HER performance inogona kuvandudzwa kwete chete nekushandura chimiro chemagetsi chesimbi inotsigirwa, asi zvakare nekuita imwe tsigiro mhedzisiro, spillover athari, boka rekutsvagisa rakashuma. Hydrogen spillover chiitiko apo adsorbed hydrogen inotama kubva pane imwe nzvimbo ichienda kune imwe, uye inoitika zviri nyore sezvo saizi yePt inova diki.

Vatsvakurudzi vakafananidza kushanda kweatomu imwe chete Pt uye Pt nanoparticles inotsigirwa ne tungsten suboxide. Iyo single-atomu Pt inotsigirwa netungsten suboxide yakaratidza dhigirii repamusoro rehydrogen spillover phenomenon, iyo yakasimudzira Pt mass chiitiko chehydrogen evolution kusvika ka10.7 zvichienzaniswa nePt nanoparticles inotsigirwa netungsten suboxide.

Muzvinafundo Lee vakati, “Kusarudza chinhu chakakodzera chekutsigira kwakakosha pakuvandudza electrocatalysis mukugadzirwa kwehydrogen. Iyo tungsten suboxide catalyst yataishandisa kutsigira Pt mukudzidza kwedu inoreva kuti kudyidzana pakati pesimbi yakanyatsoenderana nerutsigiro kunogona kusimudzira zvakanyanya kushanda kwayo. "