Duquesne Elise, Betelu Stéphanie, Seron Alain, Ignatiadis Ioannis, Perrot Hubert, Debiemme-Chouvy Catherine
Laboratoire Interfaces et Systèmes Électrochimiques (UMR8235), Sorbonne Université, CNRS, 4 Place Jussieu, 75005 Paris, France.
BRGM, French Geological Survey, 3 Avenue Claude Guillemin, 45000 Orléans, France.
Nanomaterials (Basel). 2020 Sep 14;10(9):1832. doi: 10.3390/nano10091832.
Studying the electrogravimetric behavior of Mg/Fe-layered double hydroxide (LDH) nanoparticles with an electrochemical quartz crystal microbalance demonstrates its pseudocapacitance properties of mix cation and anion exchanger. The electrochemical control of the oxidation state of iron constituting the layered sheets allowed anion intercalation/deintercalation into the LDH interlayer space. Concomitantly, in agreement with the pH of zero point of net charge of the Mg/Fe-LDH, the interfacial pH increase via catalyzed hydrogen evolution reaction allows cation electroadsorption onto the external surfaces of the nanoplatelets.
用电化学石英晶体微天平研究镁/铁层状双氢氧化物（LDH）纳米颗粒的电重量行为，证明了其作为混合阳离子和阴离子交换剂的赝电容特性。对构成层板的铁的氧化态进行电化学控制，可使阴离子插入/脱插层状双氢氧化物的层间空间。同时，与镁/铁层状双氢氧化物净电荷零点的pH值一致，通过催化析氢反应使界面pH值升高，从而使阳离子电吸附到纳米片的外表面。
