Wuhan University

About: Wuhan University is a education organization based out in Wuhan, China. It is known for research contribution in the topics: Population & Feature extraction. The organization has 92849 authors who have published 92882 publications receiving 1691049 citations. The organization is also known as: WHU & Wuhan College.

Polyimides: Promising Energy‐Storage Materials

Abstract: Based on this redox mechanism, we developed a series of polyamides with different structures and investigated their electrochemical activity as cathode materials for rechargeable lithium batteries. The results show that the polymer framework endows these samples with excellent cycling stability. Additionally, their capacity and rate capability are also satisfactory. The five polyimides were obtained through a simple polycondensation between commonly used dianhydrides and diamines. Coin cells consisting of the cathode (polyimide: conductive carbon: PTFE= 6:3:1), lithium anode and electrolyte (1 M LiTFSI/DOL+DME) were used for cycling tests, with the cutoff voltage of 1.5~3.5 V. FTIR characterization confirms the obtaining of our target products. In the charge/discharge measurements, all the samples show efficiency close to 100%. The Table below summarizes the results of five typical products. The theoretical capacity is calculated based on a four-electron mechanism shown above. The strong resemblance in the average discharge voltage and voltage profile between the sample PI-1 and PI-2, PI-3 and PI-4 seems to imply that the average discharging voltage are mainly determined by the functional group adjacent to the carbonyl group rather than that attached to the nitrogen atom. Comparing the theoretical capacity and experimental value, it can be generalized that almost half of the active site is available to be attached by Li, which possibly suggests that two electrons have been transferred during the charge/discharge process. Considering the importance of cyclabilty and rate performance, polyimide containing NTCDA(1,4,5,8-naphthalenetetracarboxylic dianhydride) unit seems to be a promising energy-storage material. Authors would express their sincere thanks to the Nature Science Foundation of China (No. 20873094) for the financial support.

The cytokine storm of severe influenza and development of immunomodulatory therapy.

Abstract: Severe influenza remains unusual in its virulence for humans. Complications or ultimately death arising from these infections are often associated with hyperinduction of proinflammatory cytokine production, which is also known as 'cytokine storm'. For this disease, it has been proposed that immunomodulatory therapy may improve the outcome, with or without the combination of antiviral agents. Here, we review the current literature on how various effectors of the immune system initiate the cytokine storm and exacerbate pathological damage in hosts. We also review some of the current immunomodulatory strategies for the treatment of cytokine storms in severe influenza, including corticosteroids, peroxisome proliferator-activated receptor agonists, sphingosine-1-phosphate receptor 1 agonists, cyclooxygenase-2 inhibitors, antioxidants, anti-tumour-necrosis factor therapy, intravenous immunoglobulin therapy, statins, arbidol, herbs, and other potential therapeutic strategies.

Focusing of sound in a 3D phononic crystal.

Abstract: We present a combined experimental and theoretical study of phonon focusing phenomena in a pass band above the complete band gap in a 3D phononic crystal Wave propagation was found to depend dramatically on both frequency and incident direction This propagation anisotropy leads to very large negative refraction, which can be used to focus a diverging ultrasonic beam into a narrow focal spot with a large focal depth The experimental field patterns are well explained using a Fourier imaging technique, based on the 3D equifrequency surfaces calculated from multiple scattering theory

High performance platinum single atom electrocatalyst for oxygen reduction reaction

Abstract: For the large-scale sustainable implementation of polymer electrolyte membrane fuel cells in vehicles, high-performance electrocatalysts with low platinum consumption are desirable for use as cathode material during the oxygen reduction reaction in fuel cells. Here we report a carbon black-supported cost-effective, efficient and durable platinum single-atom electrocatalyst with carbon monoxide/methanol tolerance for the cathodic oxygen reduction reaction. The acidic single-cell with such a catalyst as cathode delivers high performance, with power density up to 680 mW cm-2 at 80 °C with a low platinum loading of 0.09 mgPt cm-2, corresponding to a platinum utilization of 0.13 gPt kW-1 in the fuel cell. Good fuel cell durability is also observed. Theoretical calculations reveal that the main effective sites on such platinum single-atom electrocatalysts are single-pyridinic-nitrogen-atom-anchored single-platinum-atom centres, which are tolerant to carbon monoxide/methanol, but highly active for the oxygen reduction reaction.