Electrode Surface-Modified Strategy for Improving the Voltage of Aqueous Supercapacitors.

Endowing aqueous supercapacitors (SCs) with high voltage is of great practical significance, but it is restricted by the water decomposition reaction occurring in the electrodes. Here, a novel surface treatment strategy is proposed to inhibit the hydrogen evolution reaction/oxygen evolution reaction at the cathode and anode by forming a passivation layer at the whole electrode surface, which widens the electrochemical stability window of the electrode and working voltage of the aqueous SCs. In addition, the cathode overpotential is increased from -1.3 to -1.48 V, and the anode is expanded from 1.42 to 1.59 V. Importantly, the aqueous SCs can work stably at 3 V operating voltage, enabling the coulombic efficiency and capacitance retention of the optimized SCs is 97% and 96% after 5000 cycles, respectively. This strategy of surface modification provides effective guidance to achieve high-voltage aqueous energy storage devices.

Tubular Polypyrrole with Chloride Ion Dopants as an Ultrafast Organic Anode for High-Power Lithium-Ion Batteries.

Polypyrrole (PPy), as a representative p-type conductive polymer, attracts wide attention for energy storage materials. However, the sluggish reaction kinetics and low specific capacity of PPy impede its application in high-power lithium-ion batteries (LIBs). Herein, tubular PPy with chloride and methyl orange (MO) anionic dopants is synthesized and investigated as an anode for LIBs. The Cl- and MO anionic dopants can increase the ordered aggregation and the conjugation length of pyrrolic chains, forming plentiful conductive domains and affecting the conduction channel inside the pyrrolic matrix, thereby achieving fast charge transfer and Li+ ion diffusion, low ion transfer energy barriers, and rapid reaction kinetics. On account of the above synergistic effect, PPy electrodes deliver a high specific capacity of 2067.8 mAh g-1 at 200 mA g-1 and a remarkable rate capacity of 1026 mAh g-1 at 10 A g-1 , realizing high energy density (724 Wh kg-1 ) and power density (7237 W kg-1 ) simultaneously.

Bilateral visual loss after selective artery embolization in the neck for hemorrhage of malignant tumor.

INTRODUCTION AND IMPORTANCE: Currently, selective arterial embolization (SAE) has been widely applied for the treatment of many diseases due to its minimal invasiveness. But the complications caused by SAE can be serious. CASE PRESENTATION: Here, we report a case of a patient who experienced bilateral blindness 4 h after selective arterial embolization (SAE). A 67-year-old man, with a 13-year history of nasopharyngeal carcinoma, was admitted to our hospital for nasopharyngeal carcinoma hemorrhage and was scheduled for SAE. The patient did not have any thromboembolic complications. His had a platelet count of 43 × 109/L (range 150-400 × 109/L) and a prothrombin time (PT) of 9.3 s. The surgery was completed under local anesthesia. However, 4 h after the surgery, the patient complained of visual loss. We performed a fundoscopy examination, which showed bilateral ophthalmic artery embolism. CLINICAL DISCUSSION: Bilateral ophthalmic artery embolism is fatal to vision. When this occurs, it would be difficult to save the eyes. So, the relevant selection of the optimal properties of the used PVA and coil embolization materials is important during SAE. CONCLUSION: It is important to improve the existing understanding of the involvement various vessels during embolization of head and neck tumors. Furthermore, special and paramount attention is to be paid to the specific pre-operative angio-architecture, particular patient condition, and the prudent choice of embolic material to prevent the occurrence of ectopic embolization.

All-Inorganic Flexible Embedded Thin-Film Capacitors for Dielectric Energy Storage with High Performance.

As passive components in flexible electronics, the dielectric capacitors for energy storage are facing the challenges of flexibility and capability for integration and miniaturization. In this work, the all-inorganic flexible dielectric film capacitors have been obtained. The flexible capacitors show a desirable recoverable energy density ( Wrec) of 40.6 J/cm3 and a good energy efficiency (η) of 68.9%. Moreover, they have no obvious deterioration on both the Wrec and η after 104 times of mechanical bending cycles or under the bending state with a curvature radius of 4 mm. Besides, the outstanding stability of the capacitors against cycle fatigue over fast 106 charge-discharge cycles is demonstrated. Most importantly, they work properly at a wide temperature range from -120 to 150 °C with Wrec > 15 J/cm3 and η > 70%. These fascinating performances endow the flexible capacitors with huge potential application in the future "microenergy storage" system in flexible electronics.