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New Method for the Synthesis of 2D Vanadium Nitride (MXene) and Its Application as a Supercapacitor Electrode.
ACS Omega ( IF 3.7 ) Pub Date : 2020-07-13 , DOI: 10.1021/acsomega.0c01215 Sandhya Venkateshalu 1 , Jayesh Cherusseri 2 , Manickavasakam Karnan 3 , Kowsik Sambath Kumar 2 , Pratap Kollu 4, 5 , Marappan Sathish 3 , Jayan Thomas 2 , Soon Kwan Jeong 6 , Andrews Nirmala Grace 1
ACS Omega ( IF 3.7 ) Pub Date : 2020-07-13 , DOI: 10.1021/acsomega.0c01215 Sandhya Venkateshalu 1 , Jayesh Cherusseri 2 , Manickavasakam Karnan 3 , Kowsik Sambath Kumar 2 , Pratap Kollu 4, 5 , Marappan Sathish 3 , Jayan Thomas 2 , Soon Kwan Jeong 6 , Andrews Nirmala Grace 1
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MXenes are the class of two-dimensional transition metal carbides and nitrides that exhibit unique properties and are used in a multitude of applications such as biosensors, water purification, electromagnetic interference shielding, electrocatalysis, supercapacitors, and so forth. Carbide-based MXenes are being widely explored, whereas investigations on nitride-based ones are seldom. Among the nitride-based MXenes obtained from their MAX phases, only Ti4N3 and Ti2N are reported so far. Herein, we report a novel synthesis of V2NTx (Tx is the surface termination) obtained by the selective removal of “Al” from V2AlN by immersing powders of V2AlN in the LiF–HCl mixture (salt–acid etching) followed by sonication to obtain V2NTx (Tx = −F, −O) MXene which is then delaminated using the dimethyl sulfoxide solvent. The V2NTx MXene is characterized by X-ray diffraction studies, field emission scanning electron microscope imaging, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscope imaging. Supercapacitor electrodes are prepared using V2NTx MXenes and their electrochemical performances are examined by cyclic voltammetry, galvanostatic charge/discharge measurement, and electrochemical impedance spectroscopy. The V2NTx MXene electrode exhibits a specific capacitance of 112.8 F/g at a current density of 1.85 mA/cm2 with an energy and power density of 15.66 W h/kg and 3748.4 W/kg, respectively, in 3.5 M KOH aqueous electrolyte. The electrode exhibits an excellent capacitance retention of 96% even after 10,000 charge/discharge cycles. An asymmetric supercapacitor fabricated with V2NTx as a negative electrode and Mn3O4 nanowalls as a positive electrode helps obtain a cell voltage of 1.8 V in aqueous KOH electrolyte.
中文翻译：
二维氮化钒（MXene）合成的新方法及其在超级电容器电极中的应用。
MXenes是一类具有独特性质的二维过渡金属碳化物和氮化物，可用于多种应用中，例如生物传感器，水净化，电磁干扰屏蔽，电催化，超级电容器等。基于碳化物的MXene正在被广泛研究，而基于氮化物的MXene的研究很少。中从它们的MAX相得到的氮化物系MXenes，只有钛4 Ñ 3和Ti 2 N被迄今报道。在此，我们报道了一种新的V 2 NT x的合成方法（T x是表面终止），该合成方法是通过将V 2的粉末浸入到V 2 AlN中选择性去除“ Al”而获得的LiF-HCl混合物中的AlN（盐酸蚀刻），然后进行超声处理以获得V 2 NT x（T x = -F，-O）MXene，然后使用二甲基亚砜溶剂将其分层。V 2 NT x MXene的特征在于X射线衍射研究，场发射扫描电子显微镜成像，能量色散X射线光谱学，X射线光电子能谱和高分辨率透射电子显微镜成像。使用V 2 NT x MXene制备超级电容器电极，并通过循环伏安法，恒电流充/放电测量和电化学阻抗谱检查其电化学性能。V 2NT x MXene电极在3.5 M KOH水性电解液中的电流密度为1.85 mA / cm 2时的比电容为112.8 F / g，能量和功率密度分别为15.66 W h / kg和3748.4 W / kg。即使经过10,000次充电/放电循环，该电极仍具有96％的出色电容保持率。用V 2 NT x作为负极和Mn 3 O 4纳米壁作为正极制成的不对称超级电容器有助于在KOH水溶液中获得1.8 V的电池电压。
更新日期：2020-07-28
中文翻译：
二维氮化钒（MXene）合成的新方法及其在超级电容器电极中的应用。
MXenes是一类具有独特性质的二维过渡金属碳化物和氮化物，可用于多种应用中，例如生物传感器，水净化，电磁干扰屏蔽，电催化，超级电容器等。基于碳化物的MXene正在被广泛研究，而基于氮化物的MXene的研究很少。中从它们的MAX相得到的氮化物系MXenes，只有钛4 Ñ 3和Ti 2 N被迄今报道。在此，我们报道了一种新的V 2 NT x的合成方法（T x是表面终止），该合成方法是通过将V 2的粉末浸入到V 2 AlN中选择性去除“ Al”而获得的LiF-HCl混合物中的AlN（盐酸蚀刻），然后进行超声处理以获得V 2 NT x（T x = -F，-O）MXene，然后使用二甲基亚砜溶剂将其分层。V 2 NT x MXene的特征在于X射线衍射研究，场发射扫描电子显微镜成像，能量色散X射线光谱学，X射线光电子能谱和高分辨率透射电子显微镜成像。使用V 2 NT x MXene制备超级电容器电极，并通过循环伏安法，恒电流充/放电测量和电化学阻抗谱检查其电化学性能。V 2NT x MXene电极在3.5 M KOH水性电解液中的电流密度为1.85 mA / cm 2时的比电容为112.8 F / g，能量和功率密度分别为15.66 W h / kg和3748.4 W / kg。即使经过10,000次充电/放电循环，该电极仍具有96％的出色电容保持率。用V 2 NT x作为负极和Mn 3 O 4纳米壁作为正极制成的不对称超级电容器有助于在KOH水溶液中获得1.8 V的电池电压。
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