The development of bifunctional electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolu-tion reaction(OER)at high current density under industrial temperatures is crucial for large-scale indus-trial hydr...
详细信息
The development of bifunctional electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolu-tion reaction(OER)at high current density under industrial temperatures is crucial for large-scale indus-trial hydrogen production from water *** this work,M-MnO2@TNTA composite electrodes were prepared by depositing various metal ion-doped manganese oxide nanoparticles on the titania nanotube array(TNTA)by successive ionic layer adsorption reaction(SILAR)method,and their HER and OER elec-trocatalytic performances were investigated in 1 M *** show that the CoFe-MnO2@TNTA com-posite electrode prepared by simultaneous doping of Co3+and Fe3+in MnO2 exhibits optimal catalytic *** with MnO2@TNTA without ion doping,the overpotentials of CoFe-MnO2@TNTA at 10 mA cm-2(η10)for HER and OER are reduced by 571 and 665 *** addition,the electrode perfor-mance can be significantly enhanced by increasing the test temperature,and the porous array structure enables CoFe-MnO2@TNTA to exhibit better performance at high current *** 50 ℃,which is the common industrial electrolytic water temperature,the η10 of CoFe-MnO2@TNTA for HER is almost equal to that of the Pt/C *** η100 of CoFe-MnO2@TNTA for HER is reduced by 35 mV com-pared with the Pt/C ***,η200 of CoFe-MnO2@TNTA for OER is significantly lowered by 111 and 184 mV compared with IrO2 and RuO2 *** CoFe-MnO2@TNTA as both the cath-ode and anode for overall water splitting,the electrolysis voltage is merely 2.33 V under the current density of 200 mA cm-2,much lower than that of IrO2(+)||Pt/C(-)(2.68 V).The present work may provide a valuable reference for the development of self-supporting bifunctional electrodes suitable for high-current-density water splitting at industrial temperatures.
Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission ...
详细信息
Zirconia nanotube array films(ZNAF)prepared by anodic oxidation method were used as immobilization materials for acridine orange(AO),rhodamine B(RB)and AO-RB systems.A comparative study on their fluorescence emission intensity,fluorescence resonance energy transfer(FRET)and fluorescence detection of nitrite in aqueous solutions and on immobilization films with ZNAF as carriers was carried *** demonstrate that the solution pH values and immobilization on ZNAF have a great influence on the per-formance of these fluorescent *** with aqueous solutions,the fluorescence emission in-tensity of AO and RB is considerably increased by immobilization,which is 8.0 and 4.2 times higher than the original,*** energy transfer efficiency(E)of the AO-RB system increases from 40.9％to 84.8％by loading it on ***,after immobilization onto ZNAF,the fluorescence detection performance of nitrite is also significantly *** limit of detection decreases from 0.95 ng/mL to 0.22 ng/mL and the sensitivity increases from 939.18 to 15,031.68 mL/pg through loading AO onto ZNAF.
Archimedean solids were first proposed by the ancient Greek philosopher Archimedes. Unfortunately, this aspect of his work was not well-documented. It was not until 1619 that the mathematician Johannes Kepler reconstr...
Archimedean solids were first proposed by the ancient Greek philosopher Archimedes. Unfortunately, this aspect of his work was not well-documented. It was not until 1619 that the mathematician Johannes Kepler reconstructed the complete set of 13 Archimedean solids [1]. Among these solids, only the snub cube and snub dodecahedron are chiral.
The precise detection and measurement of dopamine（DA）,a crucial neurotransmitter in the human body,plays a significant role in diagnosing,preventing,and treating neurological diseases associated with its levels.A hi...
详细信息
The precise detection and measurement of dopamine（DA）,a crucial neurotransmitter in the human body,plays a significant role in diagnosing,preventing,and treating neurological diseases associated with its levels.A highly sensitive DA electrochemical sensor was constructed by combining molybdenum disulfide quantum dots（MSQDs） with multiwalled carbon nanotubes（MWCNTs）.The MSQDs were synthesized using the shear exfoliation *** sensors consist of MSQDs with Mo-S edge catalytic centers for the DA redox reaction,and MWCNTs amplify the sensor *** linearity of the sensor for the detection of DA was tested in the presence of ascorbic acid(AA,50 μmol·L-1) and uric acid(UA,200 μmol·L-1),and exhibited linearity from 2 to 966 μmol·L-1of DA with 0.097 μA(mol·L-1)-1sensitivity and a low limit of detection of0.6 μmol·L-1（the ratio between signal and noise,S/N=3）.Moreover,the sensitivity and selectivity of the sensor were also studied using *** is no increase in amperometric current after adding the most potentially interfering *** sensor was successfully applied to recover DA in human blood sera ***,machine learning algorithms were operated to aid in the near-precise detection of DA in the heterogeneous mixture containing AA and *** algorithms facilitate the identification and quantification of DA amidst coexisting interferents,including AA,that are commonly present in biological matrices.
The topological states of the two-leg and three-leg ladders formed by two trivial quantum wires with different lattice constants are theoretically investigated. Firstly, we take two trivial quantum wires with a lattic...
详细信息
The topological states of the two-leg and three-leg ladders formed by two trivial quantum wires with different lattice constants are theoretically investigated. Firstly, we take two trivial quantum wires with a lattice constant ratio of 1:2 as an example. For the symmetric nearest-neighbor intra-chain hopping two-leg ladder, the inversion symmetry protected topological insulator phase with two degenerate topological edge states appears. When the inversion symmetry is broken, the topological insulators with one or two topological edge states of different energies and topological metals with edge states embedded in the bulk states could emerge depending on the filling factor. The topological origin of these topological states in the two-leg ladders is the topological properties of the Chern insulators and Chern metals. According to the arrangement of two trivial quantum wires, we construct two types of three-leg ladders. Each type of the three-leg ladder could be divided into one trivial subspace and one topological nontrivial subspace by unitary transformation. The topological nontrivial subspace corresponds to the effective two-leg ladder model. As the filling factor changes, the system could be in topological insulators or topological metals phases. When the two-leg ladder is constructed by two trivial quantum wires with a lattice constant ratio of 1:3 and 2:3, the system could also realize rich topological states such as the topological insulators and topological metals with the topological edge states. These rich topological states in the two-leg and three-leg ladders could be confirmed by current experimental techniques.
X-ray security inspection for detecting prohibited items is widely used to maintain social order and ensure the safety of people’s lives and property. Due to the large number of parameters and high computational comp...
详细信息
To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging ***,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,a...
详细信息
To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging ***,an intelli gent pH-responsive hydrogel(BP4VA/PAS)with rapid and high contrast changes in color,fluorescence,and shape simultaneously is reported The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative(BP4VA)into copolymer networks(PAS)of acrylamide and sodium 4-styrene *** acid conditions,the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red *** the same time,the electrostatic interactions between 2H-BP4VA^(2+)and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to *** alkaline treatment,the 2H-BP4VA^(2+)/PAS hydrogel deproto nates and recovers to its original color,fluorescence,and ***,utilizing rapid and remarkable pH-responsive properties o BP4VA/PAS hydrogels,we successfully demonstrated its applications in biomimicry,camouflage,and multistage information *** tively,this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information en cryption.
1 Introduction On-device deep learning(DL)on mobile and embedded IoT devices drives various applications[1]like robotics image recognition[2]and drone swarm classification[3].Efficient local data processing preserves ...
详细信息
1 Introduction On-device deep learning(DL)on mobile and embedded IoT devices drives various applications[1]like robotics image recognition[2]and drone swarm classification[3].Efficient local data processing preserves privacy,enhances responsiveness,and saves ***,current ondevice DL relies on predefined patterns,leading to accuracy and efficiency *** is difficult to provide feedback on data processing performance during the data acquisition stage,as processing typically occurs after data acquisition.
Depth images are often used to improve the geometric understanding of scenes owing to their intuitive distance properties. Although there have been significant advancements in semantic segmentation tasks using red-gre...
详细信息
暂无评论