I-carbonized melamine foam, evezwe liqela elikhokelwa nguJaephil Cho kwi-Ulsan National Institute of Science and Technology (Korea), inoveli esebenza kakuhle kakhulu ye-electrocatalyst yokunciphisa i-oksijini kwiiseli zepetroli kunye neebhetri, inika isisombululo esinokwenzeka ukunciphisa iindleko kodwa ukubonelela ngeebhetri zomoya zetsimbi kunye neeseli zamafutha.
Iqela lezazinzulu zaseKorea naseMelika ngoku liqalise izinto ezintsha zee-electrodes ezisekelwe kwi -melamine foam efikelelekayo kunye ne-carbon black. I-porosity ephezulu yenza kube lula kakhulu ukuthuthwa kobunzima ngokukhawuleza kwaye inani elikhulu lamaziko asebenzayo ngokwe-catalytically landisa kakhulu umsebenzi wokunciphisa i-oksijini wee-cathodes zeeseli zepetroli kunye neebhetri zesinyithi-zomoya.
Ukusabela okwenzeka kwii-cathodes zeeseli ze-fuel kunye neebhetri zetsimbi zomoya kukunciphisa i-electrochemical ye-oksijini, oko kukuthi i-oxygen reduction reaction (ORR). Oku kusabela kuthintelwe kakhulu ngenxa yesantya sokucotha kwayo, kwaye ukusebenza kakuhle kweeseli kusezantsi kunokuba bekunokuba njalo.
I-catalytic cathode kufuneka iqinisekise ukuba i-oksijini isabela emanzini, ithatha ii-electron zenze i-OH-ions kwisisombululo se-alkaline. Ingxaki kukuba kwinkqubo entsonkothileyo ebandakanya okuqinileyo, ulwelo, kunye ne-gaseous reactants, iinkqubo zothutho zihlala zicotha kakhulu kwaye zithintela inkqubo, ngakumbi xa kukhutshelwa ngokuxinana okuphezulu kwangoku.
Iicathodes ezenziwe ngenkxaso yekhabhoni erhabaxa (ikhabhoni emnyama) apho intsimbi esebenzayo njengeplatinam isasazwe ngokucokisekileyo inokunciphisa ngokufanelekileyo oku kuthintelwa kwekinetic. Nangona kunjalo, zibiza kwaye azinzanga kakhulu, ngaloo ndlela zibenza bangasebenzi ukusetyenziswa ngokubanzi.
Iqela elikhokelwa nguJaephil Cho kwi-Ulsan National Institute of Science and Technology (Korea) kunye noMeilin Liu kwi-Georgia Institute of Technology (USA) ngaloo ndlela ijolise ekuphuhliseni enye indlela yoqoqosho.
Baphefumlelwe yi-tetrapod structure (i-tetra yesiGrike: ezine, iipodes: iinyawo) ze-breakwaters ukudibanisa i-electrocatalyst entsha esebenza kakhulu. IiTetrapods, ezine “nyawo” ezine ezijongwe kwiikona zetetrahedron yentelekelelo, zakhiwe elunxwemeni kwakunye kufuphi namadama kunye neepier ukuze kuncitshiswe amandla amaza antlitheka elunxwemeni. Ezi zakhiwo zikwabonelela ngendawo yokugcina ubomi baselwandle kwimingxuma yabo emininzi emikhulu. Xa i-melamine foam yenziwe i-pyrolyzed kwaye iphantsi ngodaka kunye ne-pestle, yenza amaqhekeza amancinci afana ne-tetrapods.
Izazinzulu zinyange igwebu le-melamine nge-iron chloride kunye ne-nitrogen-doped ketjenblack (i-pellets eqhuba i-carbon emnyama). Bafake i-carbonized le mveliso kwaye bayikhuphe nge-asidi ye-sulfuric. Iziphumo ze-nanotetrapods ezigcwele i-nanoparticles ye-carbon emnyama inommandla ophezulu kakhulu, inani elikhulu lamaziko asebenzayo (i-Fe/Fe3C, kunye namaqela e-CN), kunye neepores ezininzi ezivumela ukuthutha ngokukhawuleza okukhulu. I-Cathodes eyenziwe ngolu hlobo olutsha lwe-electrode luhlala luhlala luqinile kwaye lusebenza kakuhle kakhulu, xa luthelekiswa nezo ze-cathodes ezisekelwe kwisinyithi - ngexabiso eliphantsi kakhulu. Oku kunokumela isiqalo esithembisayo sesizukulwana esitsha sebhetri esebenza ngentsimbi esebenza kakuhle kakhulu kunye neeseli zamafutha.
I-SINOYQX ixhasa amanye amaziko kunye neeyunivesithi eTshayina ngokuguqula i-melamine foam ibe yi-carbon ukuze kuncitshiswe ioksijini kwiiseli zepetroli kunye neebhetri.
Ezinye zicatshulwe kwi http://www.chemistryviews.org/details/ezine/4153391/Inspired_by_a_Breakwater.html