I-Hydrogen, njengenye indlela engakhiphi kumafutha ezinto ezimbiwa phansi, iya ngokuya iba umshayeli obalulekile wekusasa elihlanzekile, elisimeme. Nakuba ukukhiqizwa kwe-hydrogen ngezinga elikhulu kuthembisa, kudinga ama-catalysts asekelwe kuplatinamu abizayo.
Ukuze kuxazululwe le nkinga, abacwaningi baseTokyo University of Science (TUS) benze inoveli ye-hydrogen evolution catalyst besebenzisa i-palladium nanosheets (PdDI) enikeza ukusebenza kahle okufana neplatinum ngenani elincane lezindleko.
Ucwaningo luholwa nguDkt. Hiroaki Maeda kanye noSolwazi Hiroshi Nishihara we-TUS ngokubambisana nabacwaningi abavela eNyuvesi yaseTokyo, i-Japan Synchrotron Radiation Research Institute, i-Kyoto Institute of Technology, i-RIKEN Spring-8 Center, kanye ne-National Institute for Materials Science, eJapane. Lokhu kutholakala kubonisa intuthuko ekusabeleni kokuziphendukela kwemvelo kwe-hydrogen (HER), inqubo eyinhloko yokukhiqizwa kwe-hydrogen eluhlaza. I-HER yenzeka ngesikhathi sokuhlukaniswa kwamanzi nge-electrolytic ukuze kukhiqizwe i-hydrogen. Ama-electrode e-HER catalyst, ngokuvamile enziwe nge-platinum, enza kube lula ukuguqulwa kwe -hydrogen esafufusa ([H]), ekhiqizwa ebusweni be-electrode ngesikhathi sokuhlukaniswa kwamanzi, ibe yi-hydrogen gas (H₂). Ngenkathi i-platinum (Pt) isebenza kahle kakhulu njenge-HER catalyst, ukushoda kwayo kanye nezindleko eziphakeme kukhulisa kakhulu izindleko zokukhiqiza futhi kunciphise ukusetshenziswa kwayo okukhulu.
Lisebenzisa indlela elula yokuhlanganisa kanye nenani elilinganiselwe lezinsimbi eziyigugu, ithimba locwaningo lakha enye indlela esebenza kahle kakhulu esikhundleni se-Pt catalysts. Ithimba lakha ama-nanosheet asekelwe ku-palladium akhulisa umsebenzi we-catalytic ngenkathi enciphisa ukusetshenziswa kwensimbi, okunciphisa kakhulu izindleko zokukhiqizwa kwe-hydrogen.
“Ukuthuthukiswa kwama-electrocatalyst e-HER asebenza kahle kuyisihluthulelo sokukhiqizwa kwe-H₂ okusimeme. Ama-nanosheet e-Palladium, anomoya ophakeme, indawo enkulu kanye nokudluliswa kwama-electron okuphumelelayo, angamakhasimende athembisayo,” kusho uHiroaki Maeda.
Ithimba lenze ama-nanosheet e-PdDI (C-PdDI kanye ne-E-PdDI) lisebenzisa izindlela ezimbili ezihlukene: i-gas-liquid interfacial synthesis kanye ne-electrochemical oxidation, ngokulandelana. Ngemva kokwenza kusebenze, izingqimba ze-E-PdDI zibonise amandla aphansi angaphezu kuka-34 mV, afana namandla angaphezu kwe-platinum angu-35 mV, okusho ukuthi amandla engeziwe amancane kakhulu ayedingeka ekukhiqizeni i-hydrogen. Ukuminyana kwamanje kokushintshisana okungu-2,1 mA/cm² nakho kufane nokusebenza okunamandla kweplatinamu. Le miphumela ibeka i-E-PdDI phakathi kwama-HER catalysts athuthukiswe kuze kube manje.
Esinye sezici ezibalulekile zanoma iyiphi i-catalyst ukuzinza kwayo kwesikhathi eside. Ama-nanosheet e-PdDI abonise ukuqina okuhle kakhulu futhi ahlala eqinile ngemva kwamahora angu-12 ngaphansi kwezimo ezine-acidic, eqinisekisa ukufaneleka kwawo ezinhlelweni zokukhiqiza i-hydrogen zomhlaba wangempela.
Ama-nanosheets e-PdDI ahambisana Nezinjongo Zokuthuthukiswa Okusimeme zeNhlangano Yezizwe (ama-SDG): SDG 7 – Ukukhuthaza amandla athengekayo nahlanzekile, kanye ne-SDG 9 – Imboni, ukusungula izinto ezintsha, nengqalasizinda. Imiphumela yalolu cwaningo idlulela ngale kokuhlolwa kwaselabhorethri. Ukukhula, ukwanda komsebenzi, kanye nokusebenza kahle kwezindleko zama-nanosheet e-PdDI kuwenza athandeke kakhulu ekukhiqizeni i-hydrogen yezimboni, amaseli e-hydrogen fuel, kanye nezinhlelo ezinkulu zokugcina amandla.
Ngaphezu kwalokho, ukufaka ama-catalysts asekelwe kuplatinamu esikhundleni se-PdDI kunganciphisa ukungcola okuhlobene nezimayini, ngaleyo ndlela kusheshise ukuguqukela emnothweni we-hydrogen osimeme. Ngaphezu kwalokho, ukuminyana kwama-athomu e-palladium kungaphansi ngokuphindwe kashumi kune-athomu ye-Pt, kunciphisa ukuncika ku-Pt yensimbi eyigugu futhi kuvumela ukukhiqizwa kwama-electrode okungabizi kakhulu. Ukushintsha i-Pt ngama-nanosheet e-PdDI kulindeleke ukuthi kulethe izinzuzo ezibalulekile embonini yezimoto, ukukhiqizwa kwe-hydrogen, kanye nokuhlinzekwa kwama-electrode.
Njengoba ucwaningo luqhubeka, ithimba le-TUS lihlose ukuthuthukisa ngokuqhubekayo ama-nanosheet e-PdDI ukuze athengiselwe futhi ngaleyo ndlela abe neqhaza ekuthuthukisweni komphakathi we-hydrogen ongayingeni imvelo.
Ukushicilelwa kwangempela
Funda futhi
I-H2BlackForest yenza i-hydrogen ilungele ukusetshenziswa kwansuku zonke | I-Pugnalom
I-Destinus yakha ipaki yokuhlola i-hydrogen | I-Pugnalom
