Gcwalisa le fomu ingezantsi kwaye siza kukuthumelela i-imeyile inguqulelo yePDF “yokuphuculwa kobuchwephesha obutsha ukuguqula ikharbon diokside ibe sisibaso solwelo”
ICarbon dioxide (CO2) yimveliso yezibaso ezivuthayo kunye neyona gesi ixhaphakileyo yegreenhouse, enokuthi ijikwe kwakhona ibe ngamafutha aluncedo ngendlela ezinzileyo. Enye indlela ethembisayo yokuguqula ukukhutshwa kwe-CO2 kwi-fuelstock feed yinkqubo ebizwa ngokuba yi-electrochemical reduction. Kodwa ukuze urhwebo lusebenze, inkqubo kufuneka iphuculwe ukukhetha okanye ukuvelisa iimveliso ezinqwenelekayo zekhabhoni. Ngoku, njengoko kuchazwe kwiphepha leNdalo yeNdalo, i-Lawrence Berkeley National Laboratory (i-Berkeley Lab) iphuhlise indlela entsha yokuphucula umphezulu we-copper catalyst esetyenziselwa ukuphendulwa kokuncedisa, ngaloo ndlela ukwandisa ukukhethwa kwenkqubo.
"Nangona siyazi ukuba i-copper iyona nto i-catalyst yale mpendulo, ayinikezeli ukhetho oluphezulu kwimveliso efunwayo," kusho u-Alexis, isazinzulu esiphezulu kwiSebe leSayensi zeMichiza eBerkeley Lab kunye noprofesa wobunjineli beekhemikhali kwiYunivesithi. eCalifornia, eBerkeley. Utshilo. "Iqela lethu lifumanise ukuba ungasebenzisa imeko yendawo ye-catalyst ukwenza amaqhinga ahlukeneyo ukubonelela ngolu hlobo lokukhetha."
Kwizifundo zangaphambili, abaphandi baye baseka iimeko ezichanekileyo zokubonelela ngeyona ndawo ingcono yombane kunye neekhemikhali ekudaleni iimveliso ezityebileyo zekhabhoni ezinexabiso lentengiso. Kodwa ezi meko zichasene neemeko ezenzeka ngokwendalo kwiiseli zepetroli eziqhelekileyo zisebenzisa izinto eziqhubayo ezisekwe ngamanzi.
Ukuze kumiselwe uyilo olunokuthi lusetyenziswe kwimekobume yamanzi yeseli yamafutha, njengenxalenye yeprojekthi yeZiko le-Energy Innovation Centre ye-Ministry of Energy's Liquid Sunshine Alliance, i-Bell kunye neqela lakhe lajika libe ngumaleko obhityileyo we-ionomer, evumela ukuba kuhlawuliswe okuthile. iimolekyuli (iionni) ukudlula. Ungafaki ezinye iiyoni. Ngenxa yeempawu zabo zeekhemikhali ezikhethiweyo kakhulu, zifanelekile ngokukodwa ukuba zibe nefuthe elinamandla kwi-microenvironment.
U-Chanyeon Kim, umphandi we-postdoctoral kwiqela le-Bell kunye nombhali wokuqala wephepha, ucebise ukuba agqume umphezulu wee-catalysts zobhedu kunye ne-ionomers ezimbini eziqhelekileyo, i-Nafion kunye ne-Sustainion. Iqela liqikelele ukuba ukwenza oko kufuneka kutshintshe indawo engqongileyo kufuphi ne-catalyst-kuquka i-pH kunye nomthamo wamanzi kunye ne-carbon dioxide-ngandlela-thile ukuqondisa ukusabela ukuvelisa iimveliso ezityebileyo zekhabhoni ezinokuguqulwa ngokulula zibe yimichiza eluncedo. Iimveliso kunye namafutha angamanzi.
Abaphandi basebenzise uluhlu oluncinci lwe-ionomer nganye kunye ne-double layer of ionomers ezimbini kwifilimu yobhedu exhaswa yi-polymer material ukwenza ifilimu, abanokuyifaka kufuphi nokuphela kwesinye iseli ye-electrochemical yesandla. Xa befaka i-carbon dioxide ebhetrini kwaye besebenzisa amandla ombane, balinganisa umthamo opheleleyo ohamba ngebhetri. Emva koko balinganisa igesi kunye nolwelo oluqokelelwe kwindawo yokugcina amanzi ngexesha lokuphendula. Kwimeko yoluhlu olubini, bafumanisa ukuba iimveliso ezityebileyo zekhabhoni zibalelwa kwi-80% yamandla asetyenziswa yi-reaction-phezulu kune-60% kwimeko engabonakaliyo.
"Le sandwich yokugquma ibonelela ngeyona nto ibhetele yehlabathi: ukukhetha okuphezulu kwemveliso kunye nomsebenzi ophezulu," kusho uBell. I-double-layer surface ayilungile kuphela kwimveliso ye-carbon-rich, kodwa iphinda ivelise i-current eqinile ngexesha elifanayo, ebonisa ukwanda komsebenzi.
Abaphandi baphetha ukuba impendulo ephuculweyo yaba ngumphumo we-CO2 yoxinaniso oluphezulu oluqokelelwe kwi-coating ngqo phezu kobhedu. Ukongezelela, iimolekyuli ezihlawuliswa kakubi eziqokelela kwingingqi phakathi kwe-ionomers ezimbini ziya kuvelisa i-asidi yendawo ephantsi. Le ndibaniselwano isusa urhwebo lokuxinana oluye lwenzeka ngokungabikho kweefilimu ze-ionomer.
Ukuze kuphuculwe ngakumbi ukusebenza kakuhle kokuphendula, abaphandi baphendukela kwitekhnoloji eqinisekisiweyo ngaphambili engadingi ifilimu ye-ionomer njengenye indlela yokunyusa i-CO2 kunye ne-pH: i-voltage e-pulsed. Ngokusebenzisa i-pulsed voltage kwi-double-layer ionomer coating, abaphandi bazuze ukunyuka kwe-250% kwiimveliso zekhabhoni ezityebileyo xa kuthelekiswa nobhedu olungafakwanga kunye nombane omileyo.
Nangona abanye abaphandi begxininise umsebenzi wabo ekuphuhliseni i-catalysts entsha, ukufunyanwa kwe-catalyst ayithatheli ingqalelo iimeko zokusebenza. Ukulawula okusingqongileyo kumphezulu we-catalyst yindlela entsha neyohlukileyo.
"Asizange size ne-catalyst entsha ngokupheleleyo, kodwa sasebenzisa ukuqonda kwethu kwe-reaction kinetics kwaye sasebenzisa olu lwazi ukusikhokela ekucingeni malunga nendlela yokutshintsha imeko yendawo ye-catalyst," watsho u-Adam Weber, injineli ephezulu. Izazinzulu kwicandelo letekhnoloji yamandla eBerkeley Laboratories kunye nombhali-zincwadi wamaphepha.
Isinyathelo esilandelayo kukwandisa ukuveliswa kwee-catalysts ezigqunyiweyo. Iqela leLebhu yaseBerkeley imifuniselo yokuqala ibandakanya iinkqubo ezincinci zemodeli ethe tyaba, ezazilula kakhulu kunezakhiwo ezinobunwele ezifunekayo kwizicelo zorhwebo. Akukho nzima ukufaka isambatho kwindawo ethe tyaba. Kodwa iindlela zorhwebo zinokubandakanya ukugquma iibhola ezincinci zobhedu, ”utshilo uBell. Ukongeza umaleko wesibini wokugquma kuba ngumngeni. Enye into enokwenzeka kukuxuba kunye nokubeka ezo zinto zimbini zokwaleka kunye kwisinyibilikisi, kwaye unethemba lokuba ziyahlukana xa isinyibilikisi siphuma ngumphunga. Kuthekani ukuba abakwenzi? UBell waqukumbela ngelithi: “Kufuneka silumke ngakumbi.” Jonga uKim C, uBui JC, uLuo X nabanye. I-microenvironment catalyst catalyst Customized for electro-reduction of CO2 kwiimveliso zekhabhoni ezininzi zisebenzisa i-double-layer ionomer coating on copper. Nat Amandla. 2021;6(11):1026-1034. doi:10.1038/s41560-021-00920-8
Eli nqaku liveliswe kwakhona ngokusuka kule nkcazelo ilandelayo. Qaphela: Imathiriyeli inokuba ihlelwe ubude kunye nomxholo. Ngolwazi oluthe vetshe, nceda uqhagamshelane nomthombo ocatshulweyo.
Ixesha lokuposa: Nov-22-2021
