Blocks of molybdenum ditelluride: A high rate anode for sodium-ion battery and full cell prototype study

High Performance Lithium‐Ion Batteries Using Layered 2H‐MoTe2 as Anode

“…These energies are a confirmation of the 2H‐MoTe 2 phase, according to the existing literature. [ 25,28–30 ] There are two additional XPS peaks at 232.16 (Mo 3d 5/2 ) eV and 235.33 eV (Mo 3d 3/2 ), which are due to the molybdenum oxide (MoO 3 ) phase that results from the formation of oxide on the surface of the sample that is under air exposure, and the same feature is observed in the earlier literature. [ 28,30 ] Figure 1e shows that the Te 3d HR‐XPS spectra at 572.87 (Te 3d 5/2 ) and 583.26 eV (Te 3d 3/2 ) are the 2H‐MoTe 2 characteristic peaks.…”

“…[ 25,27,28,40 ] There are a number of possible reasons for this discrepancy. The most likely reasons are the pseudocapacitive behavior of TMDs at lower potentials, [ 25,27,32,41 ] and the job‐sharing mechanism between Mo‐nanoparticles and Li during conversion reaction. [ 27,31 ] The formation of the gel‐like polymer film (shown in Figure S4b, Supporting Information, for the electrode after full discharge) due to a high surface area and more active sites causes the decomposition of electrolytes during the electrochemical reaction.…”

“…The continuous decrease of the R ct with cycling proves that faster Li + mobility in the MoTe 2 electrode leads to low overpotential after the first cycle. [ 25 ] Further, the Li + diffusion coefficient (D Li+ ) is calculated from the in situ ElS, which is performed at different discharging and charging potentials of the second cycle, as shown in Figure S7a,b, Supporting Information. The inclined line at the low‐frequency region (Figure S7a,b, Supporting Information) implies the Warburg behavior, which is associated with lithium‐ion diffusion within the MoTe 2 electrode.…”

TMDs beyond MoS2 for Electrochemical Energy Storage

“…For example, MoSe 2 is a structural analogue of MoS 2 ; however, it has a narrower bandgap and greater interlayer spacing with respect to MoS 2 , indicative of its superior performance as an anode in SIB systems . Likewise, MoTe 2 , another important member of the TMD family, also exhibits large interlayer spacing (0.70 nm) to be able to accommodate larger ions (e.g., the 0.35 nm Na + ion for SIB systems) . Te also demonstrates greater electronic conductivity (2×10 2 S m −1 ) than both S (5×10 −13 S m −1 ) and Se (1×10 −3 S m −1 ); thereby indicating improved electronic conductivity .…”

“…Likewise, MoTe 2 , another important member of the TMD family, also exhibits large interlayer spacing (0.70 nm) to be able to accommodate larger ions (e.g., the 0.35 nm Na + ion for SIB systems) . Te also demonstrates greater electronic conductivity (2×10 2 S m −1 ) than both S (5×10 −13 S m −1 ) and Se (1×10 −3 S m −1 ); thereby indicating improved electronic conductivity . MoTe 2 has demonstrated stable performance as anodes in SIB systems and aqueous supercapacitor applications .…”