EQCM Investigation on Electrodeposition and Charge Storage Behavior of Birnessite-Type MnO2
EQCM Investigation on Electrodeposition and Charge Storage Behavior of Birnessite-Type MnO2
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水钠锰矿型MnO2电沉积和电荷存储行为的EQCM研究
DOI：
10.1149/05043.0085ecst
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Masaharu Nakayama
中科院分区：
文献类型：
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作者：
Mitsuhiro Shamoto;Takahiro Tanimoto;Kazuaki Tomono;Masaharu Nakayama
在多种碱金属存在下，高锰酸根离子(MnO4-)经阴极还原制备了水钠锰矿型层状锰氧化物。利用电化学石英晶体微天平(EQCM)对电沉积和电荷储存过程进行了监测。电沉积过程中获得的摩尔质量表明，MnO2是随着共存阳离子和水分子的加入而同时生长的。摩尔质量按Li&Gt；Rb~K~Cs&Gt；Na的顺序减小，与结晶度的顺序一致。显然，水钠石形成过程中的结晶度取决于客体离子和水的掺入量。在Na2SO4电解液中，在阴极和阳极扫描过程中，水钠锰矿修饰电极的质量增加和减少。测得摩尔质量分别为21.6g/摩尔电子和24.9g/摩尔电子，均与Na的原子量(23.0g)相吻合。
We have fabricated birnessite-type layered manganese oxide by cathodic reduction of aqueous permanganate ions (MnO4-) in the presence of various alkaline metals. The electrodeposition and charge storage processes were monitored by means of electrochemical quartz crystal microbalance (EQCM). Molar masses acquired for the electrodeposition process revealed that MnO2 grows concurrently with the incorporation of the coexisting cations and water molecules. The molar mass decreases in the order of Li> Rb~ K~ Cs> Na, which is in good agreement with the order of crystallinity. Clearly, the degree of crystallinity in the formation of birnessite depends on the incorporation amount of the guest ions and water. The birnessite-modified electrode increases and decreases in mass during cathodic and anodic scans in Na2SO4 electrolyte. The molar masses obtained were 21.6 and 24.9 g per mole of electrons, respectively, both of which coincide with the atomic weight of Na (23.0 g).