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CeMn0.25Al0.25Ni1.5+x(x=0.0, 0.3, 0.5, 0.7, 0.9, 1.1)合金的相結(jié)構(gòu)和電化學(xué)性能
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中國(guó)科學(xué)院稀土化學(xué)與物理重點(diǎn)實(shí)驗(yàn)室基金資助


Phase Structure and Electrochemical Characteristics of CeMn0.25Al0.25Ni1.5+x (x =0.0, 0.3, 0.5, 0.7, 0.9, 1.1) Alloys
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    研究了CeMn0.25Al0.25Ni1.5+ x（x=0.0，0.3，0.5，0.7，0.9，1.1）超化學(xué)計(jì)量比合金的相結(jié)構(gòu)和電化學(xué)性能。XRD、SEM和電化學(xué)性能測(cè)試結(jié)果表明：CeMn0.25Al0.25Ni1.5+x（x=0.0，0.3，0.5，0.7，0.9，1.1）合金主要含有六方的CeAl相和立方的CeNi相，合金的粒徑隨x值的增大而變大。Ni的超化學(xué)計(jì)量比添加能夠大大提高合金的電化學(xué)活性，298 K時(shí)，合金的放電容量從x=0.0時(shí)的118.3 mAh/g提高到x=1.1時(shí)的200.7 mAh/g；338 K時(shí)，其放電容量隨x值增大呈先增后減的趨勢(shì)，x=0.0合金的放電容量為170.4 mAh·g-1，當(dāng)x=0.9時(shí)，放電容量出現(xiàn)最大值271.4 mAh/g。合金電極的P-C-T曲線(xiàn)表明：隨Ni超化學(xué)計(jì)量的增加，合金的平衡氫壓平臺(tái)斜率變小，寬度增大，平衡氫壓升高，這可能是使合金電極放電容量增加的主要原因。

    Abstract:

    The phase structure and electrochemical characteristics of CeMn0.25Al0.25Ni1.5+x (x=0.0, 0.3, 0.5, 0.7, 0.9, 1.1) alloys with Ni overstoichiometric addition were studied. XRD, SEM and electrochemical testing have revealed that all alloys mostly contain hexagonal CeAl phase and cubic CeNi phase, and the grain size of the alloys becomes larger with increasing Ni content. The electrochemical activity of CeMn0.25Al0.25Ni1.5+x alloys has been greatly improved by Ni overstoichiometric addition and the discharge capacity can increase from 118.3 mAh·g-1 (x=0.0) to 200.7 mAh·g-1 (x=1.1) at 298 K and from 170.4 mAh·g-1 (x=0.0) to 271.4 mAh·g-1 (x=0.9) at 338 K, respectively. The P-C-T curves show that the slopes of equilibrium hydrogen pressure plateau of CeMn0.25Al0.25Ni1.5+ x (x=0.0, 0.3, 0.5, 0.7, 0.9, 1.1) alloys become flatter, longer and higher with increasing Ni content, and therefore this may be the key factor that enhances the discharge capacity of the alloys. CeMn0.25Al0.25Ni2.4 alloy is a kind of candidate anode material for MH-Ni with further optimizing compositions.

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侯春平,趙敏壽,李 佳,黃 亮. CeMn0.25Al0.25Ni1.5+x(x=0.0, 0.3, 0.5, 0.7, 0.9, 1.1)合金的相結(jié)構(gòu)和電化學(xué)性能[J].稀有金屬材料與工程,2012,41(1):100~104.[Hou Chunping, Zhao Minshou, Li Jia, Huang Liang. Phase Structure and Electrochemical Characteristics of CeMn0.25Al0.25Ni1.5+x (x =0.0, 0.3, 0.5, 0.7, 0.9, 1.1) Alloys[J]. Rare Metal Materials and Engineering,2012,41(1):100~104.]
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  • 收稿日期:2011-01-21
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