PEM Introduction
PEM dej electrolyzer siv PEM los ua cov protons thiab cais cov roj ntawm ob sab ntawm cov electrode, zam qhov tsis zoo cuam tshuam nrog AWE siv cov kua dej muaj zog alkaline electrolytes. PEM dej electrolytic cell siv PEM li electrolyte thiab dej ntshiab li reactant. Tsis tas li ntawd, PEM muaj hydrogen permeability tsawg thiab ua kom muaj hydrogen purity siab. Tsuas yog dej vapor yuav tsum tau muab tshem tawm. Lub xovtooj ntawm electrolytic txais cov qauv xoom qhov sib txawv thiab tsis tshua muaj ohm tsis kam, uas ua rau muaj txiaj ntsig zoo ntawm cov txheej txheem electrolytic thiab ua rau lub ntim ntau dua. Kev tswj qhov siab yog loj, hydrogen tso zis siab tuaj yeem ncav cuag ob peb mpa, hloov mus rau qhov hloov pauv sai ntawm lub zog hluav taws xob txuas ntxiv. Yog li ntawd, PEM electrolysis ntawm dej hydrogen ntau lawm yog ib txoj kev cog lus ntsuab hydrogen ntau lawm technology.
Nws tseem yuav tsum tau muab sau tseg tias cov fwj rau hydrogen ntau lawm los ntawm PEM hydrolysis yog tus nqi thiab lub neej. Nyob rau hauv tus nqi ntawm electrolytic cell, bipolar phaj nyiaj txog li 48 feem pua thiab daim nyias nyias electrode nyiaj txog li 10 feem pua. Cov qib siab thoob ntiaj teb tam sim no ntawm PEM yog: ib leeg ntawm tes ua haujlwm ntawm 2 A·cm -- 2@2 V, tag nrho cov platinum catalyst load ntawm 2 ~ 3 mg / cm2, lub sijhawm ua haujlwm ruaj khov ntawm 6 × 104 ~ 8 × 104 h , tus nqi ntawm hydrogen ntau lawm yog kwv yees li $ 3.7 ib kg ntawm hydrogen. Kev tshawb fawb ntawm kev txo cov nqi ntawm PEM electrolytic cell tsom rau cov khoom tseem ceeb xws li membrane electrode, gas diffusion txheej thiab bipolar phaj raws li catalyst thiab PEM cov ntaub ntawv.
Bipolar phaj thiab ntws teb tus account rau ib tug loj feem ntawm cov electrolytic cell nqi, txo tus nqi ntawm bipolar phaj yog tus yuam sij rau kev tswj tus nqi ntawm electrolytic cell. Hauv kev ua haujlwm hnyav ntawm cov anode hauv PEM electrolyzer, corrosion ntawm cov phaj bipolar yuav ua rau leaching ntawm cov hlau ions, uas yuav paug PEM. Yog li ntawd, kev tiv thaiv ib puag ncig ntawm cov phaj bipolar yog los npaj cov txheej txheem tiv thaiv corrosion ntawm qhov chaw. Lettenmeier et al.
npaj Ti txheej los ntawm lub tshuab nqus tsev plasma txau ntawm stainless hlau bipolar phaj los tiv thaiv corrosion, thiab tom qab ntawd npaj Pt txheej los ntawm magnetron sputtering los tiv thaiv kev txo cov conductivity los ntawm Ti oxidation. Cov kev tshawb fawb ntxiv tau pom tias qhov kev ua haujlwm ntawm tes zoo sib xws tuaj yeem tswj tau los ntawm kev hloov Pt txheej nrog cov txheej txheem Nb pheej yig dua, thiab lub xov tooj ntawm tes tuaj yeem ua haujlwm ruaj khov rau ntau dua 1000 h. Pab neeg tshawb fawb ntawm University of Tennessee tau siv cov cuab yeej tsim khoom siv ntxiv los tsim cov khoom siv hlau tsis zoo nrog lub thickness ntawm 1 hli ntawm lub phaj cathode bipolar, thiab tso cov roj sib txuas nrog lub thickness ntawm 0.15 hli rau nws. Lub cathode impedance ntawm ib lub xovtooj me me heev, thiab kev ua haujlwm ntawm lub xovtooj yog li 2 A·cm -- 2@1.715 V, tab sis qhov saum npoo tseem yuav tsum tau txhim kho kev ruaj ntseg. Tsis tas li ntawd, Oak Ridge National Laboratory, Kaus Lim Kauslim Lub Tsev Haujlwm Saib Xyuas Kev Tshawb Fawb thiab Tshuab thiab lwm lub koom haum kuj tau ua cov txheej txheem ntawm kev tsim cov phaj bipolar rau PEM electrolytic hlwb.
Cov khoom siv electrode tam sim no siv, feem ntau yog sivTitanium fiber ntau, uas muaj kev ua haujlwm zoo thiab corrosion kuj.
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