Ithimba elivela ku-JGU lisungule izikhuthazi zokuhlukanisa amanzi ezingabizi futhi eziphumelelayo zokukhiqizwa kwe-hydrogen eluhlaza , okuthi ukusebenza kwazo kukhula ngokumangalisayo ngokuhamba kwesikhathi.
I-hydrogen iyindlela exoxwa kakhulu endleleni eya ekukhiqizweni kwamandla angathathi hlangothi kwe-CO₂. Ugesi ovela emithonjeni evuselelekayo – ikakhulukazi amandla omoya kanye nelanga – usetshenziswa kuma-electrolyzer ukuhlukanisa amanzi abe yizingxenye zawo: i-oxygen kanye ne-hydrogen egcinwayo. Ama-catalyst abalulekile ukuqala lokhu kusabela. Kuze kube manje, kuye kwasetshenziswa ama-oxide ensimbi ayigugu njenge-ruthenium dioxide kanye ne-iridium dioxide, kodwa lawa ayivelakancane, ayabiza, futhi abola kalula ezindaweni ezine-acidic kanye ne-alkaline.
UDkt. Dandan Gao, inhloko yeqembu locwaningo elincane kanye ne-DFG Walter Benjamin Fellow eJohannes Gutenberg University Mainz (JGU), kanye nethimba lakhe ngenxa yalokho bathuthukise i-catalyst ehlukile: Yenziwe ngezinto ezitholakala kalula nezingabizi njenge -cobalt ne -tungsten , ihlukile. "Isici esiyingqayizivele ukuthi yize ama-catalyst avamile egcina ukusebenza kwawo—noma elahlekelwa yiwo ngoba awazinzile ngokwanele—i-catalyst yethu ikhulisa ukusebenza kwawo ngokuhamba kwesikhathi," kuchaza uDandan Gao. "Ngemuva kokwenza ngcono, umsebenzi wawo uphakeme kakhulu kunowe-catalyst avamile." Imiphumela isanda kushicilelwa kumagazini i-Angewandte Chemie.
Kodwa siyini isizathu salokhu kuzilungiselela okungavamile? Ukuze baphendule lo mbuzo, ososayensi benze uphenyo lokuhlola kanye nolwethiyori. Phakathi kwezinye izinto, bathole ukuthi uhlobo lwamakhemikhali lwe-cobalt-tungsten oxide evuselelayo luyashintsha ngokuhlukana kwamanzi: Nakuba i-cobalt ekuqaleni yayikhona njenge-Co₂, yaguquka yaba yi-Co₃, kanti isilinganiso se-W₆ ne-W₆ sashintsha saba yi-tungsten. "Kuvela ukusabela okubili ngesikhathi sokuhlukana kwe-hydrogen: ukusabela kwe-hydrogen kanye nokusabela kwe-oxygen. Ukusabela kwe-oxygen kuyimbangela yokusabela okuphelele, yingakho sishukumiseleka ukuthuthukisa i-catalyst ethuthukisiwe yayo," kusho uGao.
Ngenkathi ukusabela kwe-oksijeni kuqala kuqhutshwa indawo ye-tungsten esebenzayo, ngokuhamba kwesikhathi ishintshela endaweni esebenzayo ye-cobalt - indawo esebenzayo ye-catalyst iyanda ngenxa yokuhlukaniswa kwamanzi. Izinguquko ku-hydrophilicity ebusweni nazo zingabonwa: kuba ukuthanda amanzi kakhulu, okuyinto ngokwemvelo ewusizo kakhulu ekuhlukaniseni amanzi e-electrochemical. "Sekukonke, singakwazi ukubona ukwehliswa ngokweqile kwamandla kanye nokuminyana okukhulayo kwamanje, okuhambisana nokwanda okukhulu kwe-kinetics yokusabela kokuvela komoyampilo," kufingqa uGao. Izindaba ezinhle zokukhiqizwa kwe-hydrogen esikhathini esizayo.
Ukushicilelwa kwangempela
UChristian Nickel et al.
Ama-electrocatalyst e-cobalt tungsten oxide azilungiselela wona abheke ekuthuthukisweni komoyampilo okuthuthukisiwe emithonjeni ye-alkaline. I-Angewandte Chemie International Edition, February 5, 2025
INGXENYE: 10.1002 / anie.202424074
Funda futhi
I-H2BlackForest yenza i-hydrogen ilungele ukusetshenziswa kwansuku zonke | I-Pugnalom
I-Destinus yakha ipaki yokuhlola i-hydrogen | I-Pugnalom
