Qhov sib txawv tseem ceeb ntawm photocatalysis thiab electrocatalysis yog tias thaum lub sij hawm photocatalysis, catalytic cov tshuaj tiv thaiv yog dominated los ntawm photoinduced electric carriers, whereas thaum lub sij hawm electrocatalysis, catalytic cov tshuaj tiv thaiv yog dominated los ntawm sab nraud circuit-induced carriers.
Photocatalysis yog cov tshuaj tiv thaiv kev yees duab uas tshwm sim thaum cov txheej txheem dawb radical pib nrog kev sib cuag ntawm cov khoom sib txuas thiab photons muaj cov qib zog txaus. Electrocatalysis, ntawm qhov tod tes, yog ib hom heterogeneous catalysis ntawm electrochemical cov tshuaj tiv thaiv uas tshwm sim ntawm electrode-electrolyte interface.
YPhotocatalysis yog dab tsi?
Photocatalysis yog cov tshuaj tiv thaiv kev yees duab uas tshwm sim thaum cov txheej txheem dawb radical pib nrog kev sib cuag ntawm cov khoom sib txuas thiab photons muaj cov qib zog txaus. Nws yog ib hom acceleration cov tshuaj tiv thaiv ntawm photoreaction nyob rau hauv lub xub ntiag ntawm ib tug catalyst. Nyob rau hauv catalyzed photolysis, lub teeb yog absorbed los ntawm ib tug adsorbed substrate. Muaj lwm hom hu ua photogenerated catalysis. Nws yog cov haujlwm photocatalytic uas nyob ntawm lub peev xwm ntawm cov catalyst los tsim ib co electron-qhov khub. Cov khub no tuaj yeem tsim cov dawb radicals xws li hydroxyl radicals uas muaj peev xwm ua rau muaj kev cuam tshuam thib ob. Thawj qhov ua tau zoo ntawm cov txheej txheem no yog kev tshawb pom ntawm dej electrolysis nyob rau hauv lub xub ntiag ntawm titanium dioxide.
Daim duab 01: Kev siv Photocatalysis
Muaj ob hom kev photocatalysis loj: homogenous thiab heterogeneous photocatalysis. Hauv homogenous photocatalysis, reactants, thiab photocatalysts muaj nyob rau tib theem. Cov piv txwv feem ntau ntawm hom tshuaj tiv thaiv no suav nrog ozone thiab yees duab-Fenton systems. Nyob rau hauv sib piv, nyob rau hauv heterogeneous photocatalysis, cov reactants thiab photocatalysts muaj nyob rau hauv ntau theem. Qee qhov piv txwv ntawm hom tshuaj tiv thaiv no suav nrog me me lossis tag nrho oxidation, dehydrogenations, hydrogen hloov pauv, thiab lwm yam.
Electrocatalysis yog dab tsi?
Electrocatalysis tuaj yeem piav qhia raws li heterogeneous catalysis ntawm cov tshuaj tiv thaiv electrochemical uas tshwm sim ntawm electrode-electrolyte interface. Hauv cov txheej txheem no, lub luag haujlwm ntawm ob qho tib si electron pub-acceptor thiab catalyst yog ua los ntawm electrode.
Daim duab 02: Siv Platinum Cathode los ntsuas qhov ruaj khov ntawm Electrocatalyst
Ib electrocatalyst yog ib hom tshuaj catalyst uas tuaj yeem koom nrog cov tshuaj tiv thaiv electrochemical. Cov tshuaj no yog cov ntaub ntawv tshwj xeeb ntawm cov catalysts uas muaj peev xwm ua haujlwm ntawm electrode nto. Feem ntau, ib qho electrocatalyst yog heterogeneous, e.g. platinized electrode. Kuj tseem muaj homogenous electrocatalysts. Cov no yog soluble, thiab lawv tuaj yeem pab hloov cov electrons ntawm electrode thiab reactants. Lawv kuj tuaj yeem pab txhawb kev hloov pauv tshuaj lom neeg nruab nrab uas peb tuaj yeem piav qhia los ntawm tag nrho ib nrab cov tshuaj tiv thaiv.
Qhov txawv ntawm Photocatalysis thiab Electrocatalysis yog dab tsi?
Photocatalysis yog cov tshuaj tiv thaiv kev yees duab uas tshwm sim thaum cov txheej txheem dawb radical pib nrog kev sib cuag ntawm cov khoom sib txuas thiab cov photons muaj zog txaus. Electrocatalysis, ntawm qhov tod tes, yog ib hom heterogeneous catalysis ntawm electrochemical kev tshwm sim tshwm sim ntawm electrode-electrolyte interface. Qhov sib txawv tseem ceeb ntawm photocatalysis thiab electrocatalysis yog tias cov tshuaj tiv thaiv catalytic ua hauv photocatalysis yog dominated los ntawm photoinduced electric cab kuj, whereas catalytic cov tshuaj tiv thaiv nyob rau hauv electrolysis yog dominated los ntawm sab nraud circuit-induced cab kuj. Ntxiv mus, photocatalysis siv photocatalysts xws li zinc oxide, zinc sulfide, cadmium sulfide, thiab strontium peroxide whereas electrocatalysis siv carbon nanotubes thiab graphene-raws li cov ntaub ntawv, hlau-organic moj khaum, thiab lwm yam.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm photocatalysis thiab electrocatalysis nyob rau hauv daim ntawv teev rau ib sab ntawm kev sib piv.
Summary – Photocatalysis vs Electrocatalysis
Photocatalysis thiab electrocatalysis yog cov txheej txheem tshuaj xyuas tseem ceeb hauv chemistry. Qhov sib txawv tseem ceeb ntawm photocatalysis thiab electrocatalysis yog tias thaum lub sij hawm photocatalysis, catalytic cov tshuaj tiv thaiv kev ua yog dominated los ntawm photoinduced electric cab kuj, whereas thaum lub sij hawm electrocatalysis, catalytic cov tshuaj tiv thaiv yog dominated los ntawm sab nraud circuit-induced carriers.
