Showing Spotlights 73 - 80 of 168 in category Fuel Cells, Hydrogen Applications (newest first):
Lithium-sulfur (Li-S) batteries, which employ sulfur as cathode and metallic lithium as anode materials, have been extensively studied as promising alternatives to the widely used lithium-ion batteries because - theoretically - they can render 3-6 times higher energy density. In practice, though, it has proven challenging to approach that theoretical value. Specifically, the rapid capacity fading, low Coulombic efficiency, and irreversible loss of active materials have impeded large-scale commercial use of Li-S batteries. Researchers now have shown that trapping lithium polysulfide species on (nanoscale) host materials is an effective way to overcome these challenges.
Apr 14th, 2016
To explore the intrinsic mechanisms of the electrochemical reactions of porous graphene oxide in situ, the single-nanowire electrochemical probe is an effective tool. Although graphene is usually used as an additive in active materials to improve the electrochemical performance, how graphene influences the electrochemical performance and reaction mechanisms of electrode materials is under dispute. To address these issues, researchers have explored single-nanowire electrochemical devices to investigate the capacitance, ion diffusion coefficient, and charge storage mechanisms of graphene.
Mar 29th, 2016
Lithium (Li) metal-based batteries such as Li-sulfur and Li-air batteries have received considerable attention because Li metal can store 10 times more energy than graphite. However, there are safety and performance concerns for these types of batteries that arise from the formation of dendrites on the electrodes. To address this issue, researchers have proposed an unstacked graphene nanostructured lithium metal anode for lithium metal batteries to inhibit lithium dendrite growth and bring superior electrochemistry performance.
Mar 15th, 2016
Capacity decay caused by polysulfides' detachment from the cathode framework has been a major issue preventing the broad application of lithium-sulfur (Li-S) batteries. Researchers discovered that it is the incompatibility between polar lithium polysulfide molecules and commonly used nanocarbon cathode scaffolds that restraines the redox reactivity. By incorporating sulfiphilic cobalt disulfide into carbon/sulfur cathodes, They managed to introduce strong interaction between lithium polysulfides and CoS2 under working conditions.
Jan 13th, 2016
The two major problems with lithium-sulfur batteries stem from the intrinsic inert reaction kinetics of sulfur redox and the unique 'shuttle' mechanism described as that soluble intermediates - polysulfides consisting of lithium-terminated sulfur-chains - diffuse between the cathode and anode, thus being consumed within the battery instead of being utilized. To solve these issues and to improve battery performance relies on not only the electrode materials but also other cell components such as the separator.
Nov 23rd, 2015
A carbon material with high electrical conductivity, high specific surface area, tunable pore structure, mechanically robust framework, and high chemical stability is an important requirement for advanced electrochemical energy storage. However, neither porous carbon or sp2 carbon can full meet these requirements yet. How to create a conductive carbon material with especially large pore volume, and hence large surface area, has therefore been a key focus in electrode research.
Oct 5th, 2015
Against the double-whammy backdrop of an energy challenge and a climate challenge it is the role of innovative energy technologies to provide socially acceptable solutions through energy savings; efficiency gains; and decarbonization. Nanotechnology It may not be the silver bullet, but nanomaterials and nanoscale applications will have an important role to play. This article provides an overview of the issues and nanomaterials and applications that are being researched in the field of energy.
Jul 23rd, 2015
Researchers have been looking to design catalyst materials that can significantly enhance the performance of oxygen evolution reaction (OER), a key eletrode reaction that is an enabling process for many energy storage options such as direct-solar and electricity-driven water splitting and rechargeable metal-air batteries. However, OER suffers from sluggish kinetics - but a novel material inspired by the pomegranate might change that.
Jul 2nd, 2015