查找使用阿拉丁产品的科研文献

Electrodeposition of a dendrite-free 3D Al anode for improving cycling of an aluminum–graphite battery

Junfeng Li,Kwan San Hui,Shunping Ji,Chenyang Zha,Chengzong Yuan,Shuxing Wu,Feng Bin,Xi Fan,Fuming Chen,Zongping Shao,Kwun Nam Hui

Aluminum–metal batteries show great potential as next-generation energy storage due to their abundant resources and intrinsic safety. However, the crucial limitations of metallic Al anodes, such as dendrite and corrosion problems in conventional aluminum–metal batteries, remain challenging and elusive. Here, we report a novel electrodeposition strategy to prepare an optimized 3D Al anode on carbon cloth with an uniform deposition morphology, low local current density, and mitigatory volume change. The symmetrical cells with the 3D Al anode show superior stable cycling (>450 h) and low-voltage hysteresis (~170 mV) at 0.5 mA cm −2 . High reversibility (~99.7%) is achieved for the Al plating/stripping. The graphite | | Al-4/CC full batteries show a long lifespan of 800 cycles with 54 mAh g −1 capacity at a high current density of 1000 mA g −1 , benefiting from the high capacitive-controlled distribution. This study proposes a novel strategy to design 3D Al anodes for metallic-Al-based batteries by eliminating the problems of planar Al anodes and realizing the potential applications of aluminum–graphite batteries.

Electrochemical Behaviors of Consumable Ti2CO@Al2O3 Anode for Ti Extraction by USTB Process

Donghua Tian,Mingyong Wang,Jingxiu Wang,Jiguo Tu,Shuqiang Jiao

USTB technology is widely considered as a low-cost and environmentally-friendly method for titanium extraction from a consumable TiCxOy anode. It is expected to directly prepare TiCxOy by selective carbothermal reduction of titanium ores, not pure TiO2. However, impurities in titanium ores, particularly Al2O3, may affect the electrochemical dissolution of TiCxOy and Ti extraction. In this work, the effects of Al2O3 impurity on the preparation and dissolution behaviors of Ti2CO are studied. It is found that the existence form of Al2O3 is not changed during carbothermal reduction. With the increase of Al2O3 content, the conductivity of Ti2CO anode slightly decreases from 143.1 to 131.6 S cm−1 and the anodic polarization curves of Ti2CO@Al2O3 shifts to the positive direction due to the increase of dissolution resistances. Al2O3 in Ti2CO@Al2O3 anode will drop into molten salts to form anode slime during USTB process. On both liquid Zn and solid nickel cathodes, Ti is electrodeposited, which is not affected by Al2O3 impurity. Therefore, it is confirmed that typical Al2O3 impurity has no obvious effect on the electrochemical dissolution of Ti2CO anode and Ti extraction. The advanced USTB process is expectedly developed by the selective carbothermal reduction of titanium ores to prepare Ti2CO anode.

Au nanoparticle-embellished UiO-66 on reduced graphene oxide as a non-enzymatic electrocatalyst at a remarkable low oxidation potential for glucose oxidation and sensing

Rongqiu Yan,Qiongfang Zhou,Hui Xie,Chenghong Lei

Au nanoparticle-embellished metal-organic frameworks UiO-66 on reduced graphene oxide (Au/UiO-66/rGO) was synthesized. Au/UiO-66/rGO displayed strong electrocatalytic activity for oxidation of glucose in alkaline solution at a remarkable low oxidation potential at +0.20 V vs. Ag/AgCl. Au nanoparticles played a paramount role for catalytic oxidation of glucose at the electrode, while both rGO and UiO-66 can significantly enhance the current responses to glucose. The resulting non-enzymatic glucose sensor exhibited a wide range of linear response, high sensitivity and selectivity for the determination of glucose. The sensor was successfully applied for the determination of glucose in honey product.

Coaxial core-sheath shaped supercapacitor based on polypyrrole functionalized graphene/carbon nanotubes hollow fibers with ultrahigh length specific capacitance and energy density for wearable electronics

Ruixue Li,Peng Song,Zhenyuan Ji,Hu Zhou,Yinxiu Xue,Lirong Kong,Xiaoping Shen

Coaxial fiber-shaped supercapacitors (FSCs) have received considerable attention due to the huge application potential in smart electronics, but their fabrications still remain challenging. Herein, using two polypyrrole functionalized graphene/carbon nanotubes hollow fibers (PPy/GCHF) with different diameters as electrodes, a coaxial FSC with a distinct core-sheath architecture is prepared. The outer scabbard electrode, PPy-750/GCHF 1.0 –8, in three-electrode, depicts a great linear capacitance of 791.9 mF cm −1 at 1 mA cm −1 with a capacity retention up to 93.2 % after 5000 charge–discharge cycles, which obviously exceeds most of the constructed fiber-shaped counterparts. Thanks to this skillful design, the PPy-750/GCHF 0.3 –8//PPy-750/GCHF 1.0 –8 FSC with efficiently shortened ion migration pathway and maximized contact area between gel electrolyte and electrodes shows an excellent linear capacitance of 561.9 mF cm −1 at 0.5 mA cm −1 with a great energy density of 49.9 μWh cm −1 , standing for one of the highest levels in FSCs. In addition, the core-sheath shaped device also affords superior mechanical flexibility and capacitive stability with capacitance retentions of 100–88.7 % from 0 to 120° bending and 84.2 % after 5000 charge–discharge cycles. The good energy storage behaviors and ingenious structure endow PPy-750/GCHF 0.3 –8//PPy-750/GCHF 1.0 –8 to have promising application prospects in wearable electronics.

Cadmium sulfide composite reduced graphene oxide for selective oxidation of 5-hydroxymethylfurfural to 2.5-diformylfurans

Chuan Yuan,Arman Amani Babadi,Sivakumar Esakkimuthu,Sijie Wu,Qizhe Zhang,Bin Cao,Shan Zhong,Gaojin Lv,Xinlin Liu,Shuang Wang

In this study, the Cadmium sulfide composite reduced graphene oxide photocatalyst (CdS/xrGO) was successfully synthesized to enhance the conversion of photocatalytic oxidation of 5-hydroxymethylfurfural (HMF). The conversion of 5-hydroxymethylfurfural and the yield of 2.5-diformylfurans (DFF) were 71.18 % and 69.72 %, respectively under optimum conditions, and the selectivity of DFF was significantly higher of about 97.94 %. Compared with CdS as a catalyst, HMF conversion and the DFF yield were roughly double. The excellent photocatalytic performance can be found through various characterization results because specific surface area of rGO is larger which provides many numbers of reaction sites for the reaction, reducing the clustering of CdS and allowing better contact between the photocatalyst and the substrate. Meanwhile, photogenerated electrons were easily transferred to the surface of rGO, which results in improving the separation potential of photogenerated carriers inhibited its complexation and resulting in enhanced photocatalytic performance.

Green rGO/FeNPs nanocomposites activated peroxydisulfate for the removal of mixed 17β-estradiol and estriol

Longjie Liu,Zeyang Lu,Wanling Cai,Gary Owens,Zuliang Chen

Reduced graphene oxide/iron nanoparticles (rGO/FeNPs) synthesized by the chemical method have been used in Fenton oxidation of organic contaminants , yet little is known about biosynthesized rGO/FeNPs using green tea extract (GT) as how to activate persulfate in sulfate radical-based advanced oxidation processes . In this study, rGO/FeNPs were used to activate peroxydisulfate (PDS) for 17β-estradiol (βE 2 ) and estriol (E 3 ) removal. The rGO/FeNPs-PDS system removed 83.6% of βE 2 and 62.5% of E 3 within 240 min, which was confirmed by a combination of adsorption and degradation via both radical and non-radical pathways. Four main reactive species in βE 2 and E 3 degradation were observed, i.e., hydroxyl radical (·OH), sulfate radical (SO 4 ·− ), singlet oxygen ( 1 O 2 ) and electron transfer , with the respective contributions of ·OH (32.9 and 34.7%), SO 4 ·− (16.1 and 19.7%), 1 O 2 (12.2 and 14.1%) and electron transfer (8.0 and 7.2%). Analysis of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Electron Paramagnetic Resonance (EPR) and electrochemical measurements all indicated that beside the well-known role of Fe, C O from rGO through the generation of ·OH, SO 4 ·− , 1 O 2 and electron transfer, as well as GT through electron transfer also participated in the activation of PDS. Finally, the degradation pathways of βE 2 /E 3 were proposed. Overall, this study provides a new insight into the biosynthesis of rGO/FeNPs to activate PDS for the oxidation of mixed emerging contaminants .

Gold Nanoparticle-Modified Electrodes for Electrochemical Sensing of Ammonia Nitrogen in Water

Ruimiao Qin,Yahui Zhang,Honggang Xu,Pengcheng Nie

As a common water pollutant, ammonia nitrogen (aN) has adverse effects on human life and production. Therefore, it is of great significance to realize the precision prevention of aN. Here, gold nanoparticle (AuNP)-modified carbon cloth (CC) electrodes were prepared for aN detection using cyclic voltammetry (CV). The first electrode was synthesized by in situ loading of AuNPs on the flexible CC (AuNPs/CC), and the second electrode was obtained by deposition of graphene coating on this basis (AuNPs/CC@G). Their selective response to aN was attributed to the formation and transformation of the gold ammonia complex through the electrodissolution of AuNPs. Two electrodes had a wide quantitative range (0.001–10000 μM); meanwhile, the limits of detection (LoDs) were down to the nanomolar level. From the aN standard to a real water sample, both nanocomposite electrodes also exhibited excellent sensing performance in the aspect of anti-interference, reusability, reproducibility, stability, and recovery. In the simultaneous comparison, the superior results of AuNPs/CC@G have confirmed the realization of optimization, which provided an innovative solution for the efficient and accurate monitoring of aN in water.

Platforms of graphene/MXene heterostructure for electrochemical monitoring of rutin in drug and Tartary buckwheat tea

Yanmei Shi,Kai Hu,Lin Mei,Liqin Chao,Mingxia Wu,Zhihong Chen,Xiangxiang Wu,Jingyi Qiao,Pingsheng Zhu,Mingsan Miao,Sisen Zhang

The use of two-dimensional heterostructure composite as electrode modification material has become a new strategy to improve the electrocatalytic activity and electroactive sites of electrochemical sensor. Herein, a soluble heterostructure, namely rGO-PSS@MXene, was designed and synthesized by integrating poly (sodium p -styrenesulfonate)-functionalized reduced graphene oxide into MXene nanosheets via ultrasonic method. The interactive heterostructure can effectively alleviate the self-stacking of MXene and rGO, endowing them with superior electron transfer capacity and large specific surface area , thereby producing prominent synergistic electrocatalytic effect towards rutin . In addition, the excellent enrichment effect of rGO-PSS@MXene for rutin also plays an important role through the electrostatic and π-π stacking interactions. The electrochemical characteristics of rutin on the sensor were examined in detail and a sensitive sensing method was proposed. Under optimized conditions, the method showed satisfactory linear relationship for rutin in the concentration range of 0.005–10.0 μM, with limit of detection of 1.8 nM (S/N = 3). The quantitative validation results in herbal medicine and commercial Tartary buckwheat tea were highly consistent with the labeled quantity and the results of HPLC determination, respectively, suggesting the sensor possessed excellent selectivity and accuracy. This proposed strategy for rutin determination is expected to expand the application of MXene heterostructure in electrochemical sensors, and is envisioned as a promising candidate for quality monitoring of drugs and foods.

An ultrasensitive unlabeled electrochemical immunosensor for the detection of cardiac troponin I based on Pt/Au–B,S,N-rGO as the signal amplification platform

Mengjiao Li,Yu Wu,Chenxi Ke,Zichen Song,Meie Zheng,Qingjie Yu,Hongda Zhu,Huiling Guo,Hongmei Sun,Mingxing Liu

In this study, an ultrasensitive unlabeled electrochemical immunosensor for the detection of cardiac troponin I (cTnI) was developed based on Pt/Au modified B,S,N co-doped reduced graphene oxide (Pt/Au–B,S,N-rGO) as a signal amplification platform. First-principles calculations were employed to analyze the electron density of states of Pt/Au–B,S,N-rGO, revealing an increase in the electron density of the graphene oxide (GO) states. Furthermore, scanning electron microscopy (SEM), X-ray photoelectron diffraction spectroscopy (XPS), and electrochemical detection were used to successfully construct and analyze Pt/Au–B,S,N-rGO. The results showed that B,S,N-rGO exhibited good electrochemical activity, and the Au/Pt NPs demonstrated excellent catalytic properties, which provided a strong foundation for achieving high-sensitivity detection. Moreover, the constructed unlabeled electrochemical immunosensor had an ideal linear range (0.1 pg/mL∼50 ng/mL) and detection limit (0.082 pg/mL). In human serum detection, the results of this immunosensor were essentially similar to the ELISA results for the same samples, which suggested that the immunosensor had a promising clinical application prospect for the detection of cTnI.

Preparation and anticorrosion properties of BTA@HNTs-GO nanocomposite smart coatings

Legang Chen,Zongxue Yu,Di Yin,Kunyao Cao

Multiple interval thixotropic test (miTT)—an advanced tool for the rheological characterization of emulsions and other colloidal systems

Stadler Florian J.,Cui Shuming,Hashmi Saud,Handschuh-Wang Stephan,Li Wenqiang,Wang Shichang,Yan Zhi-Chao,Zhu Guangming

In the last years, the 3iTT protocol—a dynamic-mechanical test (DMT) at low deformation and constant frequency, followed by a start-up flow (SUF) at constant shear-rate, and a DMT—was developed as an alternative to check for changes in material behavior, which was extended to form the multiple interval thixotropic test protocol (miTT), differing in modifying the shear rates systematically. The results of this test routine are a viscosity function η( \(\dot{\gamma }\) ) with increasing and decreasing \(\dot{\gamma }\) and the dependence of G’ and G” on \(\dot{\gamma }\) previous test . More importantly, the G’ and G” are strongly influenced by the previously applied shear rate. While regular emulsions show a decrease of G’ and G” upon a higher shear rate \(\dot{\gamma }\) in the previous shear step, the pickering emulsions with graphene oxide show an increase. In both cases, the change is approximately reversible. The changes in G’ and G” correlate well with the emulgel composition.

Tuning the electronic structure of bimetallic CoCu clusters for efficient hydrolysis of ammonia borane

Yufeng Chen,Kang Wang,Kaiqi Nie,Jiaou Wang,Shifeng Wang,Kun Feng,Jun Zhong

Efficient and low cost catalysts for the hydrogen production from ammonia borane (AB) are highly required to build up the upcoming hydrogen economy. Here we demonstrated that the non-active material could be directly transformed to highly active catalyst for the hydrolysis of AB when the surface parts were stripped to form tiny clusters on graphene oxide (GO), with the presence of strong cluster-support interaction. Moreover, the catalytic activity can be greatly enhanced by further tuning the electronic structure of clusters with various compositions. As a result, the final bimetallic CoCu catalyst on GO can achieve a high total turnover frequency (TOF) value of 72.4 (H 2 ) mol/(Cat-metal) mol·min with an activation energy of 47.8 kJ/mol, which is over 3 times higher than the monometallic clusters on GO. The cluster-support interaction has been clearly identified by synchrotron radiation X-ray absorption spectroscopy. An internal charge transfer from Cu to Co in the clusters can also be identified, which will weaken the B-N bond in AB and then effectively accelerate the hydrolysis of AB to achieve the high performance.