Khoom- lub xeev hydrogen cia zaum ntawm qhov chaw ntawm hydrogen kev lag luam txoj kev thauj mus los ntawm lub fwj. Ob tsev neeg cov khoom siv coj tus nqi -titanium-raws li AB₂-hom alloys thiab magnesium-raws li hydrides. Txhua tus tuaj nrog lub zog thiab qhov tsis zoo. Qhov kev xaiv nyob ntawm daim ntawv thov.
Peev xwm: Gravimetric Phab ntsa
Magnesium hydride (MgH₂) muaj qhov theoretical hydrogen cia muaj peev xwm ntawm 7.6 wt%, qhov siab tshaj plaws ntawm cov khoom rov qab los ntawm - cov ntaub ntawv hauv xeev [11†L7-L8]. Qhov txiaj ntsig gravimetric no tau khaws magnesium nyob rau hauv pem hauv ntej ntawm lub peev xwm-tsav kev tshawb fawb rau xyoo.
Titanium{0}}raws li AB₂ alloys ua haujlwm hauv ntau yam sib txawv. TiMn₂ thiab TiCr₂ systems feem ntau xa 1.8–2.0 wt% nominal cia ceev [1†L29-L31]. Optimized compositions zoo li Ti0.75Zr0.25Cr0.75Mn1.2 + 1.5 wt.% Ce thawb mus rau 1.87 wt% hauv scalable ntau lawm [0†L27-L29]. Siab -entropy BCC alloys mus ntxiv-Ti32V32Nb18Cr9Mn9 nce mus txog 2.9 wt% [1†L9-L10]. AB₂-type Ti–Cr–V–Mn variants cia 1.92 wt% txawm nyob rau −10℃[10†L6-L9].
Ntawm gravimetric ceev ib leeg, magnesium yeej. Tab sis qhov tiag -kev sib piv hauv ntiaj teb no ntau dua nuanced.
Kinetics: Ua kom thiab Cycling
Ntawm no yog qhov kev txiav txim siab sib txawv.
Magnesium hydride yuav tsum tau dehydrogenation kub nyob ib ncig ntawm 280-300℃vim muaj zog Mg-H daim ntawv cog lus ruaj khov [3†L5-L6]. Siab thermodynamic teeb meem thiab kinetics sluggish txwv kev xa mus ua haujlwm yam tsis muaj cua sov sab nraud [4†L9-L11]. Catalytic doping thiab nanoconfinement cov tswv yim txo qis cov kev pib no-qee PdNi@rGN composites poob dehydrogenation pib kub rau 140℃nrog ua kom muaj zog ntawm 70.5 kJ·mol⁻¹ [11†L31-L34] -tab sis cov no tseem nyob hauv chav kuaj ua tiav, tsis yog cov qauv kev lag luam.
Titanium alloys ua haujlwm ntawm 20-50 degree, nyob ze ambient. Qhov no tshem tawm qhov kev xav tau rau cov cua sov txheej txheem. AB₂-hom Laves theem alloys zoo li TiCrMn nqus thiab desorb hydrogen ntawm −30℃txog 80 degree, yoog rau ob qho tib si huab cua txias thiab nruab nrab cua sov yam tsis muaj kev pabcuam [10†L34-L37].
Magnesium's 280℃yuav tsum tau ua kom nws nyob rau hauv siab -kub niche daim ntawv thov. Titanium chav tsev- kub ua haujlwm haum rau hauv tsheb thiab chaw nres tsheb ncaj qha.
Kinetics: Ua kom thiab Cycling
Titanium{0}}raws li alloys qhia tau hais tias ua kom muaj txiaj ntsig zoo yam tsis muaj kev kho ua ntej. Cov kev tshawb fawb qhia Ti–Mn raws li cov alloys nqus hydrogen ntawm chav tsev kub hauv qab 5 MPa, xa mus txog 1.98 wt% yam tsis muaj kev ua haujlwm ua ntej [1†L32-L36]. Porous titanium lug npaj los ntawm hmoov metallurgy-siv Ti hmoov tov nrog Mn / Cr, txias isostatic nias, thiab nqus sintering ntawm 1200℃-ua tiav ambient reversible cia nyob ib ncig ntawm 1.8 wt% nrog negligible hysteresis thiab tsis pom decay tshaj 10.5L-cycles
Magnesium's kinetics tseem yog lub hauv paus tseem ceeb. Txawm tias muaj Ni, Cr, Fe, Cu co-catalysis, hydrogenation thiab dehydrogenation activation zog ntawm MgH₂ yuav tsum tau ceev faj engineering. Lub thermal stability yog siab heev uas absorbing hydrogen yuav tsum tau siab kub nyob rau hauv lub board [3†L36-L37].
Cycling stability txhawb nqa titanium kom zoo dua. Ti-AB₂ alloys ua kom pom lub neej voj voog ntev tshaj li 1000 lub voj voog nrog ntau dua 80% muaj peev xwm tuav tau [1†L4-L6]. Magnesium hydride, nyob rau hauv sib piv, raug kev txom nyem los ntawm ntim expansion-contraction cycles thaum lub sij hawm hydride tsim thiab decomposition, ua rau particle pulverization thiab muaj peev xwm ploj mus.
Kev nyab xeeb thiab kev ua haujlwm siab
Titanium cov tshuab ua haujlwm qis dua 4 MPa hauv qis- siab zog- lub xeev teeb tsa, piv rau 70 MPa rau Hom IV compressed hydrogen tanks [1†L20-L21]. Lub siab qis txo cov nqi ntim khoom thiab tshem tawm kev puas tsuaj puas tsuaj.
Magnesium hydride, thaum muaj kev nyab xeeb, xav tau kev ua haujlwm siab - kub. Cua sov rau 300℃qhia nws tus kheej kev nyab xeeb kev xav.
