Polyimide Compounds For Post-Lithium Energy Storage Applications.

The exploration of cathode and anode materials that enable reversible storage of mono and multivalent cations has driven extensive research on organic compounds. In this regard, polyimide (PI)-based electrodes have emerged as a promising avenue for the development of post-lithium energy storage systems. This review article provides a comprehensive summary of the syntheses, characterizations, and applications of PI compounds as electrode materials capable of hosting a wide range of cations. Furthermore, the review also delves into the advancements in PI based solid state batteries, PI-based separators, current collectors, and their effectiveness as polymeric binders. By highlighting the key findings in these areas, this review aims at contributing to the understanding and advancement of PI-based structures paving the way for the next generation of energy storage systems

To what extent do anions affect the electrodeposition of Zn?

Zinc metal, with its high theoretical capacity and low cost, stands out as a promising anode material for affordable high energy-density storage technologies in rechargeable batteries. However, obtaining a high level of reversibility in zinc electrodeposition, which is pivotal for the success of rechargeable zinc-metal-based batteries, remains a significant challenge. A critical factor in this regard is the physicochemical characteristics of the electrolyte solution. Previous studies have indicated that adjusting the electrolyte solutions' composition with additives or co-solvents, along with fine-tuning concentrations and pH levels, can enhance the reversibility and kinetics of Zn deposition/stripping. However, the precise impact of Zn salts counter anions in the electrolyte solutions on these processes is not fully understood yet. Aiming to focus on the key fundamental aspects related to the electrolytes' influences on the Zn electroplating, we delve into the impact of anions on this process. Using advanced in situ and ex situ analytical methods, we reveal the role of the anions in the electrolyte solutions in zinc deposition/dissolution processes. Computational simulations shed light on the electrolytes' solvation structure, establishing a clear relationship between deposition behavior and the molecular variations specific to the different anions. These findings pave the way for new design principles aimed at optimizing the composition of electrolyte solutions for zinc metal batteries, potentially enhancing their performance and efficiency

Using fMRI connectivity to define a treatment-resistant form of post-traumatic stress disorder

A mechanistic understanding of the pathology of psychiatric disorders has been hampered by extensive heterogeneity in biology, symptoms, and behavior within diagnostic categories that are defined subjectively. We investigated whether leveraging individual differences in information-processing impairments in patients with post-traumatic stress disorder (PTSD) could reveal phenotypes within the disorder. We found that a subgroup of patients with PTSD from two independent cohorts displayed both aberrant functional connectivity within the ventral attention network (VAN) as revealed by functional magnetic resonance imaging (fMRI) neuroimaging and impaired verbal memory on a word list learning task. This combined phenotype was not associated with differences in symptoms or comorbidities, but nonetheless could be used to predict a poor response to psychotherapy, the best-validated treatment for PTSD. Using concurrent focal noninvasive transcranial magnetic stimulation and electroencephalography, we then identified alterations in neural signal flow in the VAN that were evoked by direct stimulation of that network. These alterations were associated with individual differences in functional fMRI connectivity within the VAN. Our findings define specific neurobiological mechanisms in a subgroup of patients with PTSD that could contribute to the poor response to psychotherapy

Depth and reef profile: effects on the distribution and abundance of coral reef fishes

The physical and biological structure of coral reef habitats vary in relation to depth and the profile of the reef, from vertical walls to gentle slopes. The differing roles of depth and reef profile on fish distribution and abundance, and the role of habitat structure in explaining these patterns, have received little attention. Here these effects were distinguished by surveying reef fish species and benthic habitat in quadrats on three aspects (shelf, slope and wall) at each of two depths (5 m and 15 m) in Kimbe Bay, Papua New Guinea. Both depth and reef profile accounted for considerable variation in reef fish communities. Species diversity and richness was highest on the shelf profile and lowest on the wall profile at 5 m. Whereas, at 15 m the opposite was true with the wall profile being the most diverse and species rich profile and the shelf being the least. Wall habitats were the most different from the other two profiles in terms of community structure. Depth had a greater influence on fish communities on slope and shelf habitats, with shallow slopes and shelfs similar to one another, and deep slopes and shelfs also similar. Some rare species, such as Chromis delta and Pictichromis paccagnellae, were restricted only to walls. The relative effects of depth and reef profile on benthic habitat structure were similar to the fish communities, with the sponge and encrusting coral dominated wall habitats being the most dissimilar to the other aspects, with clear depth patterns also. There was a significant correlation between the fish communities present and the habitat availability at the depths and on the reef profiles studied. The correlation was best explained by sand, branching coral, encrusting coral, massive coral and rubble. Depth and reef profile had a significant interaction, which suggests that, clearly, both depth and profile are important factors affecting reef fish communities. Although, benthic habitat appears to only partially explain these patterns