Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance

Electrodeposition Behavior of Extracted Platinum Complex in Phosphonium-Based Ionic Liquids Evaluated by Electrochemical Quartz Crystal Microbalance
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电化学石英晶体微天平评价提取的铂配合物在鏻基离子液体中的电沉积行为

DOI:
10.1149/1945-7111/ac120d
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发表时间:
2021
影响因子:
3.9
通讯作者:
Sasaki Yuji
Sasaki Yuji
中科院分区:
工程技术4区
文献类型:
--
作者:
Matsumiya Masahiko;Tsuchida Yusuke;Kinoshita Ryoma;Sasaki Yuji

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为了减少二次废物的产生,发展铂族金属的溶剂萃取和电沉积工艺具有重要意义。采用电化学石英晶体微天平(EQCM)研究了萃取后的Pt(IV)配合物在离子液体中的电沉积行为。在-0.53 V下观察到电荷转移反应Pt(IV)+2 e −→ Pt(II)。通过EQCM评估的质量变化(Δm)和表观摩尔质量(M app)的显著增加(193.7)证实了电沉积反应Pt(II)+2 e −→ Pt(0)在该系统中在-1.65 V下进行。此外,在Alamine 336/IL体系中连续进行溶剂萃取和Pt金属电沉积10个循环。在第1 ~ 6次循环中,萃取率(E> 95.1%)和电流效率(ε> 85.8%)均保持较高水平。XPS Pt-4f 7/2谱证实了所有电沉积物均处于金属状态。
It is important to develop solvent extraction and electrodeposition processes for platinum group metals in order to reduce the volume of secondary wastes. In this study, the electrodeposition behavior of the extracted Pt (IV) complex in a phosphonium-based ionic liquid (IL) was investigated by using an electrochemical quartz crystal microbalance (EQCM). The charge transfer reaction Pt (IV)+ 2e−→ Pt (II) was observed at− 0.53 V. The significant increase in the mass change (Δm) and the apparent molar mass (M app) of 193.7, as evaluated by the EQCM, confirmed that the electrodeposition reaction Pt (II)+ 2e−→ Pt (0) proceeded at− 1.65 V in this system. Moreover, consecutive solvent extraction and electrodeposition of Pt metal in Alamine336/IL system were performed at 10 cycles. High extraction percentage (E> 95.1%) and good current efficiency (ε> 85.8%) were maintained in the first to sixth cycles. The XPS Pt-4f 7/2 spectrum confirmed that all the electrodeposits were in the metallic state.
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