In Situ Grown Ultrafine RuO₂ Nanoparticles on GeP₅ Nanosheets as the Electrode Material for Flexible Planar Micro-Supercapacitors with High Specific Capacitance and Cyclability

Abstract

GeP 5 , as the most representative phosphorus-based material in two-dimensional layered phosphorous compounds, has shown a fairly bright application prospect in the field of energy storage because of its ultrahigh electrical conductivity. However, high-yield exfoliation methods and effective structure construction strategies for GeP 5 nanosheets are still missing, which completely restricts the further application of GeP 5 -based nanocomposites. Here, we not only improved the yield of GeP 5 nanosheets by a liquid nitrogen-assisted liquid-phase exfoliation technique but also constructed the GeP 5 @RuO 2 nanocomposites with the 0D/2D heterostructure by in situ introduction of ultrafine RuO 2 nanoparticles on highly conductive GeP 5 nanosheets using a simple hydrothermal synthesis method, and then applying it to microsupercapacitors (MSCs) as electrode materials through a mask-assisted vacuum filtration technique. It is precisely because of the synergy of the electrical double-layer material, GeP 5 nanosheets and the pseudocapacitance material RuO 2 nanoparticles that endows the GeP 5 @ RuO 2 electrode with outstanding electrochemical performance in micro-supercapacitors with a large specific capacitance of 129.5 mF cm −2 /107.9 F cm −3 , high energy density of 17.98 μWh cm −2 , remarkable long-term cycling stability with 98.4% capacitance retention after 10 000 cycles, the exceptional mechanical stability, outstanding environmental stability, and excellent integration features. This work opens up a new avenue to construct GeP 5 -based nanocomposites as a most promising novel electrode material for practical application in flexible portable/wearable micro-nanoelectronic devices.

Spectroscopic Monitoring of the Electrode Process of MnO2@rGO Nanospheres and Its Application in High-Performance Flexible Micro-Supercapacitors

“…Meanwhile, the CV curves remain coincident at 50 mV s –1 under different bending degrees (Figure i), and the capacity of the MSCs has no obvious decay after 2000 bending cycles (Figure j), further manifesting the excellent flexibility of the device. Noticeably, the MSC device exhibits a higher energy density of 1.01 μWh cm –2 than those in the literature − (Figure k). Although the power density of 0.12 mW cm –2 is not the highest, the preparation process of active materials is simple and efficient (Figure S8).…”

Hollow Nanowire Constructed by NiCo Doped RuO2 Nanoparticles for Robust Hydrogen Evolution at High‐Current‐Density

“…Corresponding element content suggests that the ratio of Ru/O is close to 1/2, indicating that the nanoparticles might be NiCo modified RuO 2 (Figure S3b). [25,26] Furthermore, EDX data of NiCo@RuO 2 HNAs/ NF reveals that the content of successfully incorporated Ru is about 22 %, while the content of Co decreases dramatically to 0.18 % (Figure S3b); this observation confirms that the Co atoms in Ni@CoCH NAs are replaced by Ru during the ion exchange process.…”

Germanium‐based monoelemental and binary two‐dimensional materials: Theoretical and experimental investigations and promising applications

“…Copyright 2021, Wiley. Reproduced with permission 510,520 . Copyright 2021, American Chemical Society.…”

“…291 In addition to the potential for use as battery electrode materials, theoretical calculations show that the energy storage potential of Ge-based 2D materials is also expected to be expanded to supercapacitors and hydrogen storage. 237,[509][510][511][512][513] Thus, Ge based 2D materials are important candidates in the field of high performance electrochemical energy storage devices.…”