Equipment-Free Deposition of Graphene-Based Molybdenum Oxide Nanohybrid Langmuir–Blodgett Films for Flexible Electrochromic Panel Application

Abstract

The potential electrochromic application of graphene-based nanohybrids is hampered by the challenges in interfacing the electrochromic nanoparticles with graphene at atomic scale and in fabricating their thin film on the substrate through a scalable method. In an effort to overcome these challenges, we demonstrate a highly dispersible graphene-based molybdenum oxide nanohybrid (mRGO-MoO3-x) for flexible electrochromic application. With only a squeeze pipet, mRGO-MoO3-x could be deposited with a high coverage on various substrates through a scalable equipment-free Langmuir-Blodgett film deposition method. By taking advantage of high transmittance benefited from its remarkable thinness, the mRGO-MoO3-x Langmuir-Blodgett film shows a superior reversible electrochromic property with high coloration efficiency on both hard and flexible substrates.

Electrochemically Synthesized Nanoporous Molybdenum Carbide as a Durable Electrocatalyst for Hydrogen Evolution Reaction

“…Meanwhile, the Tafel slope of np‐MoO 3 shows a steep increase at ≈−0.18 V versus RHE, indicating that hydrogen adsorption is more severely hindered at lower potentials. Mo oxide is a well‐known material for rapid cation intercalation, and thus the rate limiting at hydrogen adsorption reaction can be attributed to the competition between proton intercalation and hydrogen adsorption. There are possibilities for H + located near the Mo oxide to move into the oxide lattice rather than participating in Volmer reaction, consequently deteriorating the adsorption of hydrogen.…”

Porous reduced graphene oxide (rGO)/WO3 nanocomposites for the enhanced detection of NH3 at room temperature

“…Moreover, SMO/graphene based nanocomposites are being continuously explored in different elds such as electrochromic smart windows, gas and biosensors and photocatalytic and energy storage applications. [13][14][15][16][17][18] Jinjin Shi et al synthesized graphene oxide/hexagonal WO 3 nanosheet composites for the detection of H 2 S and the sensors employing these nanocomposites showed a low detection limit of 10 ppb at a temperature of about 330 C. 19 Tarcisio M. Perfecto et al explored WO 3 $0.33H 2 O nano-needles and their composites with rGO for detecting isopropanol down to 1 ppm at room temperature. 20 Xiaoqian et al successfully employed the one-step hydrothermal method to prepare WO 3 nanorods/ graphene nanocomposites, which exhibited sensitivity towards NO 2 up to 25 ppb at 300 C. 21 Jasmeet Kaur et al fabricated rGO/ WO 3 nanocomposite lms, which could detect as low as 1 ppm of acetone in air and exhibited a maximum sensing response at a lower working temperature (200 C).…”

Free‐standing Reduced Graphene Oxide/MoO3‐x Composite Film with High Performance for Flexible Supercapacitors

“…Meanwhile, when composited with graphene or rGO, not only can α‐MoO 3 contribute greatly to the high specific capacitance but also it can act as spacers to prevent the aggregation of graphene or rGO sheets. In this way, the composite can effectively realize the synergistic effect of good conductivity of graphene or rGO and high capacitance of α‐MoO 3 , Therefore, it is an admirable way to load α‐MoO 3 on the graphene or rGO film substrate for free‐standing and binder‐free flexible electrodes of flexible supercapacitors. In addition, for flexible electrode of supercapacitors, the thicker composite film will generally lead to the increase of areal specific capacitance but the decrease of gravimetric capacitance in most cases .…”