Structural Construction of WO3 Nanorods as Anode Materials for Lithium-Ion Batteries to Improve Their Electrochemical Performance

Abstract

WO3 nanobundles and nanorods were prepared using a facile hydrothermal method. The X-ray diffraction pattern confirms that the obtained samples are pure hexagonal WO3. Transmission electron microscope images detected the gap between the different nanowires that made up the nanobundles and nanorods. As the anode materials of lithium-ion batteries, the formed WO3 nanobundles and WO3 nanorods deliver an initial discharge capacity of 883.5 and 971.6 mA h g−1, respectively. Both WO3 nanostructures deliver excellent capacity retention upon extended cycling. At a current density of 500 mA g−1, the reversible capacities of WO3 nanobundle and WO3 nanorod electrodes are 444.0 and 472.3 mA h g−1, respectively, after 60 cycles.

Dual-Functional Electrochromic Smart Window Using WO3·H2O-rGO Nanocomposite Ink Spray-Coated on a Low-Cost Hybrid Electrode

“…In comparison, the deconvoluted W4f spectra show a shift of ∼0.20 eV in W 4f peaks toward higher binding energy for WH-rGO (0.4%). Furthermore, the deconvoluted O1s spectra of pristine WO 3 ·H 2 O and WH-rGO (0.4%) show three peaks corresponding to lattice oxygen (∼530.4 eV), oxygen vacancies (∼531.7 eV), and chemisorbed oxygen (∼536.6 eV) (Figure e). , However, in the case of WH-rGO, an additional subpeak is seen perhaps due to oxygen bonded to carbon, C–OH (∼532.8) . Also, in the case of WH-rGO, C1s spectra show increased intensities of C–OH (∼286.5 ± 0.2 eV) and OCO (288.8 eV) subpeaks, which directly relate to the rGO-induced functionalization of WO 3 ·H 2 O (Figure f). , Thus, the shifting of peaks toward higher binding energies, intense additional peak due to direct carbon and oxygen bond, and high intensities associated with the functional group peaks in WH-rGO, all imply a well-blended nature of rGO and WO 3 ·H 2 O …”

“…Furthermore, the deconvoluted O1s spectra of pristine WO 3 • H 2 O and WH-rGO (0.4%) show three peaks corresponding to lattice oxygen (∼530.4 eV), oxygen vacancies (∼531.7 eV), and chemisorbed oxygen (∼536.6 eV) (Figure 2e). 56,57 However, in the case of WH-rGO, an additional subpeak is seen perhaps due to oxygen bonded to carbon, C−OH (∼532.8). 58 Also, in the case of WH-rGO, C1s spectra show increased intensities of C−OH (∼286.5 ± 0.2 eV) and O� C�O (288.8 eV) subpeaks, which directly relate to the rGOinduced functionalization of WO 3 •H 2 O (Figure 2f).…”

WO3/CoWO4/rGO high porosity anode electrode materials based on ZIF-67 framework

“…Then add 3.29g Na 2 WO 4 •2H 2 O to 45ml of water and adjust the pH to about 2 using hydrochloric acid to form a light-yellow solution and then add 0.8g oxalic acid and 2g potassium chloride to form a colorless and transparent solution. [21] The 50mg GO and 50mg Co-C frames were added to the prepared solution for ultrasonic 1h, and the last one was held in 180℃ for 24h to form WO 3 /CoWO4/rGO. WO 3 particles were prepared using the same method.…”

“…[14,15] Various nanostructured WO3 anodes have been developed, demonstrating improved performances likely due to their small sizes that facilitate fast Li + diffusion and strain relaxation. [16][17][18][19][20][21] The exceptional conductivity of ZIF-67 holds promise to compensate for the insu cient electrical conductivity of WO3, thereby enhancing electron conduction and improving the charge-discharge e ciency of batteries. [22] The introduction of ZIF-67 into the composite material effectively alleviates the volume expansion issue of WO3, enhancing the structural stability of the electrode and improving the cyclic performance and capacity retention of the battery.…”

WO3 /CoWO4 /rGO high porosity anode electrode materials based on ZIF-67 framework

“…[14,15] Various nanostructured WO3 anodes have been developed, demonstrating improved performances likely due to their small sizes that facilitate fast Li + diffusion and strain relaxation. [16][17][18][19][20][21] The exceptional conductivity of ZIF-67 holds promise to compensate for the insu cient electrical conductivity of WO3, thereby enhancing electron conduction and improving the charge-discharge e ciency of batteries. [22] The introduction of ZIF-67 into the composite material effectively alleviates the volume expansion issue of WO3, enhancing the structural stability of the electrode and improving the cyclic performance and capacity retention of the battery.…”