Electron oriented injection TiSe₂–C laminated heterojunctions derived from terminal functionalized MXene for high-rate sodium ion storage

Abstract

TiSe2–C laminated heterojunctions with electron oriented-injection property exhibit outstanding rate performances in sodium ion batteries.

A Novel Hierarchical Structure of SnCu2Se4/d-Ti3C2Tx/NPC for a Lithium/Sodium Ion Battery and Hybrid Capacitor with Long-Term Cycling Stabilities

“…The high-resolution C 1s spectrum in Figure d can be deconvoluted into four peaks at 288.6, 285.1, 284.5, and 284.1 eV, originating from O=C–O, C–N, C–C, and C–Ti, respectively. , The N 1s spectrum in Figure e presents three peaks at 402.2, 400.7, and 398.4 eV ascribable to graphitic N, pyrrolic N, and pyridinic N, respectively . The Se 3d spectrum in Figure f shows two peaks at 55.9 and 54.3 eV, which can be ascribed to TiO x Se 2‑ x and Se 3d 3/2 , respectively . The existence of TiO x Se 2‑ x in Figure f verifies the covalent binding between d-Ti 3 C 2 T x and SnCu 2 Se 4 , which can significantly improve the structural integrity of SnCu 2 Se 4 /d-Ti 3 C 2 T x /NPC.…”

“…29 The Se 3d spectrum in Figure 1f shows two peaks at 55.9 and 54.3 eV, which can be ascribed to TiO x Se 2-x and Se 3d 3/2 , respectively. 32 The existence of TiO x Se 2-x in Figure 1f The morphologies and structures of the samples were characterized via SEM and TEM. Figure S5a,b shows the SEM images of the Ti 3 AlC 2 precursor and closely stacked d-Ti 3 C 2 T x , respectively.…”

Heteroatom preintercalated Cl-terminated Ti3C2Tx MXene wrapped with mesoporous Fe2O3 nanospheres for improved sodium ion storage

“…31 Besides, according to the DFT calculations, the pre-intercalation of Na + can effectively reduce the diffusion energy barrier and thus improve the diffusion kinetics of Na + . 32 In a word, MXene and secondary materials complement each other, moreover, make the most of their respective advantages in structural stability and theoretical capacity. 33…”

“…31 Besides, according to the DFT calculations, the pre-intercalation of Na + can effectively reduce the diffusion energy barrier and thus improve the diffusion kinetics of Na + . 32 In a word, MXene and secondary materials complement each other, moreover, make the most of their respective advantages in structural stability and theoretical capacity. 33 In this work, we propose the successful fabrication of a composite anode for SIBs, where mesoporous Fe 2 O 3 nanospheres distribute uniformly on the Cl-terminated Ti 3 C 2 T x MXene via the surfactant CTAB.…”

Hierarchical MXene/transition metal oxide heterostructures for rechargeable batteries, capacitors, and capacitive deionization

“…Nevertheless, MXene electrodes suffer from the following issues: (1) low capacity or capacitance; (2) MXene sheets can be easily restacked during the preparation of the electrodes; (3) the electronic conductivity of MXene sheets decreases with the oxidation of the MXene; and (4) termination -F groups may influence the electrolyte infiltration into the electrodes. [57][58][59][60][61][62][63][64][65][66][67][68] To solve the above problems and enhance the electrochemical performance of MXenes, a lot of effort has been made to, for example, construct few-layer MXene sheets, 69 nanostructured MXene, 70,71 porous MXene, [72][73][74][75][76][77] MXene/transition metal oxides (TMOs), [78][79][80][81] and MXene/transition metal chalcogenides (TMCs). [82][83][84][85] In particular, constructing hierarchical MXene/ TMO heterostructures can remarkably improve the electrochemical performance of MXene-based electrodes in batteries, capacitors, and CDI.…”