Tsis ntev los no, King Abdullah University of Science thiab Technology (KAUST) tau nthuav tawm cov txiaj ntsig ntawm kev tshawb fawb uas yuav pab txhim kho cov khoom siv anode rau cov roj teeb tiam tom ntej.
Raws li tsab ntawv ceeb toom, KAUST tau qhia txog kev sivlaser pulses los hloov cov qauv ntawm ib qho kev cog lus lwm cov khoom siv electrodehu ua "MXene" los txhim kho nws lub zog muaj peev xwm thiab lwm yam khoom tseem ceeb.
Nyob rau hauv txoj kev tshawb no, cov kws tshawb fawb tau piav qhia tias graphite muaj cov txheej txheem ca ntawm cov pa roj carbon atom, thiab thaum lub sijhawm them roj teeb, lithium atoms tau khaws cia ntawm cov txheej txheem no hauv cov txheej txheem hu ua "embedding". Cov qauv ntawm cov khoom "MXene" kuj muaj cov txheej txheem uas tuaj yeem tuav lithium, tab sis cov txheej txheem no yog ua los ntawm cov hlau hloov pauv xws li titanium lossis molybdenum ua ke nrog carbon lossis nitrogen atoms, uas ua rau cov khoom siv tau zoo heev.
Cov txheej no kuj muaj cov atom ntxiv, xws li oxygen lossis fluorine, ntawm lawv qhov chaw. Lub molybdenum carbide-raws li "MXene" cov ntaub ntawv qauv muaj ib tug tshwj xeeb zoo lithium cia muaj peev xwm, tab sis nws cov kev ua tau zoo kuj deteriorates sai sai tom qab rov qab them / tawm mus.
Pab pawg KAUST, coj los ntawm Husam N. Alshareef thiab Zahra Bayhan, pom tias qhov kev degradation no yog tshwm sim los ntawm cov tshuaj hloov pauv hauv MXene qauv uas tsim molybdenum oxide.
Yuav kom daws tau qhov teeb meem no, lawv siv infrared laser pulses los tsim me me "nanodots" ntawm molybdenum carbide nyob rau hauv cov qauv ntawm cov khoom "MXene", ib tug txheej txheem hu ua "laser scribing. Cov txheej txheem hu ua "laser scribing. Cov nanodots no, uas yog hais txog 10 nanometers dav, yog txuas rau cov txheej txheem ntawm MXene los ntawm carbon.
Qhov no muaj ntau yam txiaj ntsig: Ua ntej, nanodots muab lub peev xwm khaws cia ntxiv rau lithium thiab ua kom cov txheej txheem them nqi thiab tawm. Kev kho laser kuj txo cov pa oxygen ntawm cov khoom, pab tiv thaiv kev tsim cov teeb meem molybdenum oxides. Thaum kawg, kev sib txuas muaj zog ntawm cov nanodots thiab cov khaubncaws sab nraud povtseg txhim kho cov khoom siv hluav taws xob ntawm "MXene" cov qauv thiab ua kom nws ruaj khov thaum lub sijhawm them nyiaj thiab tso tawm.
Hauv tsab ntawv tshaj tawm, Bayhan tau hais tias, "Qhov no muab cov txiaj ntsig zoo thiab nrawm rau kev kho cov roj teeb ua haujlwm."
Cov kws tshawb fawb tau ua ib qho anode nrog cov khoom siv laser-inscribed thiab sim nws hauv lithium-ion roj teeb uas muaj ntau tshaj 1, 000 lub voj voog them nqi. Nrog cov nanodots, cov khoom siv hluav taws xob cia muaj peev xwm yog plaub zaug siab dua li ntawm MXene thawj, yuav luag txog qhov muaj peev xwm tshaj plaws ntawm graphite. Cov khoom siv laser-inscribed kuj pom tias tsis muaj peev xwm poob rau hauv kev sim caij tsheb kauj vab.
Raws li qhov tshwm sim ntawm cov txiaj ntsig no, lawv ntseeg tias cov ntawv sau laser tuaj yeem siv los ua lub tswv yim dav dav los txhim kho kev ua tau zoo ntawm lwm cov khoom siv "MXenes". Qhov no tuaj yeem, piv txwv li, ua rau txoj kev loj hlob ntawm ib tiam tshiab ntawm cov roj teeb uas siv tau los siv cov hlau uas pheej yig dua thiab ntau dua lithium. Tsis tas li ntawd, tsis zoo li graphite, MXenes cov khoom siv kuj tuaj yeem kos nrog sodium thiab potassium ions.
