39 research outputs found
Electrochemically Self-Doped TiO<sub>2</sub> Nanotube Arrays for Supercapacitors
The application of highly ordered
TiO<sub>2</sub> nanotube arrays
(NTAs) for energy storage devices such as supercapacitors has been
attractive and of great interest owing to their large surface area
and greatly improved charge-transfer pathways compared to those of
nonoriented structures. Modification of the semiconductor nature of
TiO<sub>2</sub> is important for its application in constructing high-performance
supercapacitors. Hence, the present study demonstrates a novel method
involving fabrication of self-doped TiO<sub>2</sub> NTAs by a simple
cathodic polarization treatment on the pristine TiO<sub>2</sub> NTAs
to achieve improved conductivity and capacitive properties of TiO<sub>2</sub>. The self-doped TiO<sub>2</sub> NTAs at −1.4 V (vs
SCE) exhibited 5 orders of magnitude improvement on carrier density
and 39 times enhancement in capacitance compared to those of the pristine
TiO<sub>2</sub> NTAs. Impedance analysis based on a proposed simplified
transmission line model proved that the enhanced capacitive behavior
of the self-doped TiO<sub>2</sub> NTAs was due to a decrease of charge-transport
resistance through the solid material. Moreover, the MnO<sub>2</sub> species was introduced onto the TiO<sub>2</sub> NTAs by an impregnation–electrodeposition
method, and the optimal specific capacitance achieved (1232 F g<sup>–1</sup>) clearly confirmed the suitability of self-doped
TiO<sub>2</sub> NTAs as effective current collector materials for
supercapacitors
Table1_Advances in the research of sulfur dioxide and pulmonary hypertension.docx
Pulmonary hypertension (PH) is a fatal disease caused by progressive pulmonary vascular remodeling (PVR). Currently, the mechanisms underlying the occurrence and progression of PVR remain unclear, and effective therapeutic approaches to reverse PVR and PH are lacking. Since the beginning of the 21st century, the endogenous sulfur dioxide (SO2)/aspartate transaminase system has emerged as a novel research focus in the fields of PH and PVR. As a gaseous signaling molecule, SO2 metabolism is tightly regulated in the pulmonary vasculature and is associated with the development of PH as it is involved in the regulation of pathological and physiological activities, such as pulmonary vascular cellular inflammation, proliferation and collagen metabolism, to exert a protective effect against PH. In this review, we present an overview of the studies conducted to date that have provided a theoretical basis for the development of SO2-related drug to inhibit or reverse PVR and effectively treat PH-related diseases.</p
Flexible Cathode Enabled by Ultralong Na<sub>2</sub>V<sub>6</sub>O<sub>16</sub>·3H<sub>2</sub>O Nanowire for High Rate and Durable Aqueous Zinc Ion Batteries
Aqueous zinc ion batteries (ZIBs) have garnered increasing
attention
owing to their safe aqueous electrolyte and suitable energy and power
density. However, the development of appropriate cathode materials
for commercialization remains a challenge. Herein, we report a flexible
binder-free film cathode composed of hydrated sodium vanadate nanowires
and carbon nanotubes (NaVO/CNT). The as-prepared film cathode exhibits
a remarkably high rate performance, delivering a capacity of 402 mAh
g–1 at 0.1 A g–1 and 284 mAh g–1 at 6 A g–1. Furthermore, excellent
long-term stability is achieved with a retention rate of 90.04% after
5000 cycles at 4 A g–1. This cathode demonstrates
outstanding performance compared with those of other sodium vanadate-based
cathodes in aqueous ZIBs. Additionally, the co(de)insertion mechanism
of H+ and Zn2+ ions is verified
Means and standard errors for lignocellulosic components and means for crystallinity for different digestion times, N = 3<sup>1</sup>.
1<p>Means with larger standard errors in a column are based on a sample size of N = 2.</p>abcd<p>Means within a column with differing superscripts differ (P<0.05).</p><p>Means and standard errors for lignocellulosic components and means for crystallinity for different digestion times, N = 3<sup><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0114399#nt105" target="_blank">1</a></sup>.</p
Sugar and ethanol concentrations for 96 h of enzymatic and fermentation for <i>Triarrhena sacchariflora</i> (Maxim.) Nakai pretreated at untreated, A2B1C1D1 (1.5%, 1∶6, 15 min, 110°C), A2B2C2D2 (1.5%, 1∶8, 30 min, 120°C), A2B1C1D2 (1.5%, 1∶6, 15 min, 120°C).
<p>Analyses were performed in triplicate with the error bars representing the corresponding standard errors.</p
Results of the incomplete factorial experiment evaluating dilute H<sub>2</sub>SO<sub>4</sub> pretreatment for <i>Triarrhena sacchariflora</i> (Maxim.) Nakai.
<p>K1 = Sum of index value of factor1, K2 =  Sum of index value of factor2, K1-bar = K1/2, K2-bar = K2/2.</p><p>Results of the incomplete factorial experiment evaluating dilute H<sub>2</sub>SO<sub>4</sub> pretreatment for <i>Triarrhena sacchariflora</i> (Maxim.) Nakai.</p
Single factor experimental design of <i>Triarrhena sacchariflora</i> (Maxim.) Nakai with dilute sulfuric acid pretreatment.
<p>Single factor experimental design of <i>Triarrhena sacchariflora</i> (Maxim.) Nakai with dilute sulfuric acid pretreatment.</p
Means and standard errors for lignocellulosic components and means for crystallinity for different forage:sulfuric acid ratios, N = 3<sup>1</sup>.
1<p>Means with larger standard errors in a column are based on a sample size of N = 2.</p>abc<p>Means within a column with differing superscripts differ (P<0.05).</p><p>Means and standard errors for lignocellulosic components and means for crystallinity for different forage:sulfuric acid ratios, N = 3<sup><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0114399#nt103" target="_blank">1</a></sup>.</p
Effect of dilute H<sub>2</sub>SO<sub>4</sub> pretreatment on sugar concentration at (A) different H<sub>2</sub>SO<sub>4</sub> concentrations with fixed forage:sulfuric acid ratio (1∶8), fixed digestion time (30 min), and fixed digestion temperature (120°C); (B) different forage:sulfuric acid ratios with fixed H<sub>2</sub>SO<sub>4</sub> concentration (1.5%), fixed digestion time (30 min), and fixed digestion temperature (120°C); (C) different digestion times with fixed H<sub>2</sub>SO<sub>4</sub> concentration (1.5%), fix forage:sulfuric acid ration (1∶8), and fixed digestion temperature (120°C); and (D) different digestion temperatures with fixed H<sub>2</sub>SO<sub>4</sub> concentration (1.5%), fixed forage:sulfuric acid ratio (1∶8), and fixed digestion time (30 min) for <i>Triarrhena sacchariflora</i> (Maxim.) Nakai.
<p>Analyses were performed in triplicate with the error bars representing the corresponding standard errors.</p
Incomplete factorial experimental design of <i>Triarrhena sacchariflora</i> (Maxim.) Nakai with dilute sulfuric acid pretreatment.
<p>Incomplete factorial experimental design of <i>Triarrhena sacchariflora</i> (Maxim.) Nakai with dilute sulfuric acid pretreatment.</p