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基于多金属氧酸盐的氧化还原超级电容器的有机-水二元溶剂的益处

Benefits of Organo-Aqueous Binary Solvents for Redox Supercapacitors Based on Polyoxometalates.

作者信息

Dsoke Sonia, Abbas Qamar

机构信息

Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) Helmholtzstraße 11 89081 Ulm Germany.

Institute for Applied Materials Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 Eggenstein-Leopoldshafen Germany.

出版信息

ChemElectroChem. 2020 Jun 2;7(11):2466-2476. doi: 10.1002/celc.202000639. Epub 2020 Jun 10.

DOI:10.1002/celc.202000639
PMID:32612902
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7319425/
Abstract

A novel redox electrolyte is proposed based on organo-aqueous solvent and a polyoxometalate (POM) redox moiety. The presence of dimethyl sulfoxide (DMSO) plays multiple roles in this system. Firstly, it enhances the cathodic electrochemical stability window by shifting the H evolution to lower potentials with respect to pure aqueous systems; secondly, it improves the reversibility of the redox reaction of the PWO anion at low potentials. The presence of DMSO suppresses the Al corrosion, thus enabling the use of this metal as the current collector. An activated carbon-based supercapacitor is investigated in 1 M LiNO/10 mM HPWO in a mixed DMSO/HO solvent and compared with a POM-free electrolyte. In the presence of POMs, the device achieves better stability under floating conditions at 1.8 V. At 1 kW kg, it delivers a specific energy of 8 Wh kg vs. 4.5 Wh kg delivered from the POM-free device. The H evolution is further shifted by the POMs adsorbed on the activated carbon, which is one reason for the improved stability. The POM-containing cell demonstrates a mitigated self-discharge, owing to strong POMs adsorption into the carbon pores.

摘要

基于有机水溶剂和多金属氧酸盐（POM）氧化还原部分，提出了一种新型氧化还原电解质。二甲基亚砜（DMSO）的存在在该体系中发挥多种作用。首先，相对于纯水体系，它通过将析氢反应移至更低电位来提高阴极电化学稳定性窗口；其次，它在低电位下改善了PWO阴离子氧化还原反应的可逆性。DMSO的存在抑制了铝的腐蚀，从而使得能够使用这种金属作为集流体。在DMSO/H₂O混合溶剂中的1 M LiNO₃/10 mM HPWO₄中研究了一种活性炭基超级电容器，并与不含POM的电解质进行了比较。在存在POM的情况下，该器件在1.8 V的浮动条件下实现了更好的稳定性。在1 kW kg⁻¹时，它的比能量为8 Wh kg⁻¹，而不含POM的器件为4.5 Wh kg⁻¹。吸附在活性炭上的POM进一步使析氢反应发生偏移，这是稳定性提高的一个原因。含POM的电池表现出自放电减轻，这归因于POM强烈吸附到碳孔中。

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