High-performance battery-type supercapacitor based on porous biocarbon and biocarbon supported Ni-Co layered double hydroxide
JOURNAL OF ALLOYS AND COMPOUNDS
Authors: Zhang, Di; Guo, Xingmei; Tong, Xiangzhi; Chen, Yifan; Duan, Mengting; Shi, Jing; Jiang, Chengwei; Hu, Leilei; Kong, Qinghong; Zhang, Junhao
Abstract
To achieve robust and efficient architecture for supercapacitor electrodes, seeds of Toona sinensis (STS) with honeycomb structure are used as template to obtain STS derived carbon (STSC), which act as substrate for both negative and positive electrodes of a battery-type supercapacitor. When activated by KOH, the as obtained anodic a-STSC-1-600 with a big specific surface area of 1031.6 m g(-1) shows a specific capacitance of 210.0 F g(-1) at 1 A g(-1). After hydrothermally growing Ni-Co layered double hydroxide, the as obtained cathodic Ni-Co LDH/STSC-0-800 exhibits a big specific capacitance of 992.2 F g(-1) (1 A g(-1)). Both electrodes show excellent rate capability due to the stable and unblocked honeycomb structure. When constructing into a battery-type supercapacitor (Ni-Co LDH/STSC-0-800 parallel to a-STSC-1-600), a wide working voltage window of 1.5 V is achieved. The device delivers a relatively high energy density of 23.5 Wh kg(-1) and a power density of 959.7 W kg(-1), with decent rate capability and cycling stability. This work explores a simple way to fabricate highly-interconnected carbon substrate and its further processing on fabricating efficient anodic and cathodic materials for battery-type supercapacitors. (C) 2020 Elsevier B.V. All rights reserved.
Hepatoprotective and antioxidant activities ofAnnona squamosaseed extract against alcohol-induced liver injury in Sprague Dawley rats
DRUG AND CHEMICAL TOXICOLOGY
Authors: Zahid, Mohammad; Arif, Muhammad; Rahman, Md. Azizur; Mujahid, Md.
Abstract
Alcohol is regarded as the third most common cause of death after hypertension and smoking. Its long-term excess exposure leads to alcoholic liver disease (ALD) and liver injury, a worldwide health problem without efficient therapy. As there is no reliable liver protective drugs in allopathic medical practices, herbs play a major role in the management of liver diseases. Thus, the present study was designed to evaluate hepatoprotective activity ofAnnona squamosaseed extract against alcohol-induced liver injury in Sprague Dawley rats. Liver toxicity was induced by 50% alcohol at dose level of 12 ml/kgpoeach, for 8 days. Ethanolic extract ofA. squamosaseed (EEAS) at dose of 200 and 400 mg/kgpowere administered once daily for 8 consecutive days. The hepatoprotective activity of EEAS was assessed in experimental rats using various biochemical parameters like ALT, AST, ALP, LDH, SBL, albumin, total cholesterol, and total protein; and antioxidant parameters like SOD, CAT, GSH, and TBARS. It demonstrated that the treatment with EEAS significantly (p < 0.05-p < 0.001) and dose-dependently prevented the alcohol-induced increase in serum levels of hepatic enzymes and significantly increased the levels of SOD, CAT, and GSH. It also significantly decreased the level of MDA. Histopathology of the liver tissues showed that EEAS attenuated the hepatocellular necrosis and led to regeneration and repair of cells toward normal. Results of this study strongly indicated the protective effect ofA. squamosaagainst alcohol-induced liver injury which may be attributed to its hepatoprotective and antioxidant activities.