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Byeon, Ayeong,Hatter, C.B.,Park, Jae H.,Ahn, Chi W.,Gogotsi, Yury,Lee, Jae W. Elsevier 2017 ELECTROCHIMICA ACTA Vol.258 No.-
<P><B>Abstract</B></P> <P>Multilayer Mo<SUB>2</SUB>CT<SUB>x</SUB> MXene is used as a precursor to produce molybdenum oxide (MoO<SUB>2</SUB>)-disordered carbon hybrid materials using a one-step CO<SUB>2</SUB> oxidation. The composites show clear, short plateaus in the charge/discharge curves as well as reversible phase transition peaks in cyclic voltammetry for the resulting MoO<SUB>2</SUB>. The electrochemical measurements support the generation of the metal oxide in the resulting composite materials. The generation of molybdenum oxide from Mo<SUB>2</SUB>CT<SUB>x</SUB> is verified from the plateau in Li<SUP>+</SUP> charge-discharge profile as wells as various characterizations of XRD, XPS, etc. The resulting MoO<SUB>2</SUB> active material coated on a copper foil shows a Li-ion capacity of 323 mAh/g at 50 mA/g (0.1 C) and 180 mAh/g at 1 A/g (4.0 C) with 85% retention for approximately 300 cycles.</P>
Electromagnetic interference shielding with 2D transition metal carbides (MXenes)
Shahzad, Faisal,Alhabeb, Mohamed,Hatter, Christine B.,Anasori, Babak,Man Hong, Soon,Koo, Chong Min,Gogotsi, Yury American Association for the Advancement of Scienc 2016 Science Vol.353 No.6304
<P>Materials with good flexibility and high conductivity that can provide electromagnetic interference (EMI) shielding with minimal thickness are highly desirable, especially if they can be easily processed into films. Two-dimensional metal carbides and nitrides, known as MXenes, combine metallic conductivity and hydrophilic surfaces. Here, we demonstrate the potential of several MXenes and their polymer composites for EMI shielding. A 45-micrometer-thick Ti3C2Tx film exhibited EMI shielding effectiveness of 92 decibels (>50 decibels for a 2.5-micrometer film), which is the highest among synthetic materials of comparable thickness produced to date. This performance originates from the excellent electrical conductivity of Ti3C2Tx films (4600 Siemens per centimeter) and multiple internal reflections from Ti3C2Tx flakes in free-standing films. The mechanical flexibility and easy coating capability offered by MXenes and their composites enable them to shield surfaces of any shape while providing high EMI shielding efficiency.</P>