ChemCatChem
·
2020
·Vol. 12
·期 23
·6040-6049
·
IF 4.853
Yongli Sun,Feifei Peng,Luhong Zhang,Bin Jiang,Haozhen Dou,Na Zhang,Mi Xu,Na Yang
Graphical Electrocatalytic Hydrogen Evolution : The morphology and diameter of porous Mo 2 C can be tuned in an easy and precise way. 0D/3D Mo 2 C P/Mo 2 C F exposes abundant active sites and possesses super water affinity to accelerate electrolyte and gas diffusion, and it works better than commercial Pt/C at high current densities in 1.0 M KOH. Herein, a novel 6∼9 nm nitrogen-doped Mo 2 C nanoparticles (Mo 2 C P) homogeneously decorated on 3D porous nitrogen-doped Mo 2 C microflowers (Mo 2 C F) were prepared in situ to form 0D/3D Mo 2 C P/Mo 2 C F. This special structure combines the advantages of Mo 2 C P and porous Mo 2 C F to provide a high density of reaction sites and facilitate the diffusion of electrolyte and hydrogen. Mo 2 C P/Mo 2 C F exhibits excellent HER performance in both alkaline and acidic solutions. It only requires an overpotential of 96 and 118 mV to achieve a current density of 10 mA cm −2 ( η 10 ) in 1.0 M KOH and 0.5 M H 2 SO 4 , respectively. Moreover, it works better than commercial Pt/C at high current densities in 1.0 M KOH. The Tafel slopes are less than 50 mV/dec in both media, suggesting an obviously fast HER kinetics. Additionally, this study presents a universally applicable method to prepare M x C P/Mo 2 C F (M=Fe, Co, V) for different applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Shaohua Sun,Yuanyuan Zhang,Zhaoyang Yang,Chunmei Liu,Xiaoyu Zuo,Yang Tang,Pingyu Wan,Yanping Liu,Xiujin Li,Frederic Coulon,Qing Hu,Xiao Jin Yang
The efficacy of NaOH, alkaline hydrogen peroxide (NaOH-H 2 O 2 ), electrochemically produced NaOH-H 2 O 2 (eNaOH-H 2 O 2 ) and electrohydrolysis (EH) pretreatments was investigated for anaerobic digestion of rice straw. The cumulative biogas production was enhanced by 8%, 22% and 14% in the NaOH-H 2 O 2 , eNaOH-H 2 O 2 and EH relative to conventional NaOH pretreatment. The chemical and electrochemical pretreatments decreased the crystallinity of cellulose and created a porous surface vein. Electrochemical NaOH-H 2 O 2 pretreatment is efficient to promote microbial degradation of lignocellulose for biogas production while the risks associated with the transportation and storage of H 2 O 2 are avoided. EH reduces the pretreatment time significantly and is a promising approach for utilizing rice straw biomass to produce renewable energy.
研究领域:
环境科学
·
微生物学
·
可再生能源
✓ 已验证
DOI
高影响因子
Solar RRL
·
2021
·Vol. 6
·期 4
·2100843
·
IF 8.582
Yiyu Zeng,Jie Wu,Kaiwen Sun,Jialiang Huang,Linhong Li,Chuhan Sha,Yin Yao,Yanqing Lai,Martin Green,Fangyang Liu,Xiaojing Hao
Antimony sulfide is an emerging 1D nontoxic Earth-abundant photovoltaic material with favorable wide bandgap as a suitable top-cell candidate for multijunction tandem solar cells. However, the current fabrication technology for Sb 2 S 3 solar cells relies heavily on a high-purity Sb 2 S 3 source, which limits its large-scale deployment. Therefore, it is attractive to fabricate the Sb 2 S 3 solar cells directly from the raw stibnite source, which can be cost effective by avoiding the complicated, costly purification and refinement process of the stibnite ore, while reducing process-emitted pollution. Herein, high-quality Sb 2 S 3 films (thickness: ≈1 μm) by the vapor transport deposition of raw stibnite ore powder are obtained, followed by a sulfurization process to remove the surface oxides and facilitate alkali element redistribution. In this way, the particle size is increased from ≈500 nm to ≈1.5 μm, the carrier concentration of the Sb 2 S 3 film is increased from ≈10 15 to ≈10 16 cm −3 , and the power conversion efficiency of Sb 2 S 3 solar cell is increased by more than two times. Through the elemental distribution analysis, it is found that it is the redistribution of alkali elements introduced from the natural stibnite ore that induces the grain growth, contributes toward defect suppression, and leads toward enhanced device performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Ruoxi Ma,Yufeng Kang,Tao Wang,Tao Jiang,Hao-yan Yin,Chao Liu,Haibing Wei,Yunsheng Ding
Anion-conducting poly(arylene alkylene)s are one of the most encouraging anion exchange membrane candidates with high alkaline stability for clean energy power generation . However, optimization of their conductivities often relies on the improvement of ion contents. Herein, a simple design strategy of backbone modification is reported, which can modulate the chain packing behavior and increase the free volume by introducing dimethylfluorenylene (DMeF) units into the poly(terphenylene alkylene) backbone, so as to realize the conductivity improvement of the membrane. The average chain spacing of DMeF-incorporated PTFPA membrane is extended to over 5.1 Å from the original poly(terphenylene alkylene) with the value of 4.2 Å. Accordingly, the membrane properties can be effectively modified by varying the contents of DMeF units, and PFTPA-81 containing 81 mol% of DMeF units particularly demonstrates a combination of high ion conductivity (177 mS cm −1 ), proper water absorption (<90 wt% at 80 °C), and uncompromised alkaline stability (>1000 h in 1 M aq. at 80 °C). Moreover, a H 2 –O 2 fuel cell prototype fabricated from PFTPA-81 achieved a high peak power density of 1.33 W cm −2 , and the cell voltage decreased less than 8% (from 0.75 V to 0.69 V) for an in-situ durability test of 30 h.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Chunhua Dai,Chuanyu Deng,Lei Zhang,Liang Wu,Tongwen Xu,Yonghui Wu
ABSTRACT Zwitterionic multisilicon copolymer is prepared from the copolymerization of 2-acrylamide-2-methyl- 1-propanesulfonic acid and γ-methacryloxy propyl trimethoxyl silane, which contain –NH–, –SO 3 H and –Si(OCH 3 ) 3 groups. The copolymer is then taken sol–gel reaction with polyvinyl alcohol to form hybrid membranes. The hybrid membranes are strong acidic and weak basic, which are used in diffusion dialysis (DD) process for alkali recovery. The hybrid membranes are generally homogeneous and compact. The initial decomposition temperature values are in the range of 204°C–210°C and the T d values are in the range of 225°C–231°C. The highest value of tensile strength is 51.8 MPa and the elongation at break (E b ) is in the range of 72.1%–289.7%. The membranes have the water uptake (W R ) of 27.7%–88.3% and cation exchange capacity of 0.90–2.15 mmol g –1 . The DD process shows that the dialysis coefficient of NaOH (U OH ) is in the range of 0.0079–0.0151 m h –1 and the selectivity (S) can reach up to 32.7. The favorable performances are attributed to the combining effect of –OH, –NH– and –SO 3 H groups.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS
·
2023
·
IF 1.3
Zizhen Huang,Jie Wang,Hui Chen,Ruofei Feng,Chunxia Tan
Four organic-polyoxometalate hybrids BR4[SiW12O40] (BR–SiW), BR3[PMo12O40] (BR–PMo), BR4K[EuSiW11O40]·2H2O (BR–EuSiW) and BR6Na3[EuW10O36] (BR–EuW) were fabricated by the polyoxometalates (POMs) anions and berberine cations (BR) noted for the alkaloids in traditional Chinese herbal medicine. These hybrids have been characterized and confirmed. The interaction between hybrids and human serum albumin (HSA) was investigated in a buffer solution (pH 7.4) using ultraviolet–visible light absorption and fluorescence techniques. The classical Stern–Volmer equation was used to analyze the fluorescence quenching at three temperatures (296, 303 and 310 K), and the static quenching mechanism for interaction was proposed. The Thermodynamic parameters, enthalpy, entropy change, and Gibbs free energy of hybrids interacting on HSA were calculated by Scatchard equation. The results indicated that therewas one binding site on the protein and BR–POMs all showed stronger binding force than that of raw materials. Synchronous fluorescence results showed that the binding sites of BR–POMs and HSA were not effectively affected the surrounding microenvironment. The following antibacterial experiments implied that inhibitory effect of hybrids were synergistic effect from organic active ingredient and POMs but the simple combination. All these data were prepared for further research on biology.
研究领域:
生物化学
·
药理学
·
分子生物学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Hui Zhang,Ma Yan,Lina Ma
Background Scintillation cocktails cannot directly measure samples with extreme acidity or alkalinity in β-nuclide liquid scintillation analysis. Plastic scintillation microspheres (PSm), as a novel scintillation material, offer the potential to overcome these limitations by allowing direct mixing with a variety of solutions for measurement, particularly in challenging chemical environments. Results This study evaluated the performance of PSm in various chemical environments, including four acids (nitric, hydrochloric, sulfuric, and phosphoric acids), an alkaline solution (NaOH), a high-salinity solution, and methanol. PSm formed stable mixtures with most solutions and exhibited excellent chemical stability in high-concentration NaOH, with minimal chemiluminescence interference. However, concentrated nitric and sulfuric acids caused chemical reactions with PSm, leading to discoloration and potential color quenching. Efficiency calibration was performed using ultrapure water, allowing for accurate measurement of 14 C activity across different solutions with simple efficiency corrections. Significance The findings of this study highlight the advantages of PSm for β-nuclide measurement in a variety of complex chemical environments. PSm's stability in highly acidic, alkaline, and saline conditions makes it a promising tool for applications such as radioactive waste monitoring and pharmacokinetic research, providing a reliable and efficient alternative to conventional scintillation cocktails.
研究领域:
核医学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Yuwen Hu,Meilian Tu,Tuzhi Xiong,Yanxiang He,Muhammad Mushtaq,Hao Yang,Zeba Khanam,Yongchao Huang,Jianqiu Deng,M.-Sadeeq Balogun
Lattice-strain engineering has demonstrated its capability to influence the electronic structure and catalytic performance of electrocatalysts. Herein, we present a facile method for inducing thermal strain in cobalt/molybdenum nitride rod-shaped structures (denoted Co/Mo 2 N) via ammonia-assisted reduction, which effectively modulating the HER performance. The optimized Co/Mo 2 N-500, characterized by 3% tensile lattice strain, demonstrates exceptional HER activity with lower overpotentials of 140 mV and 184 mV at high current density of 1000 mA cm −2 in alkaline freshwater and seawater electrolytes, respectively. Co/Mo 2 N also exhibits excellent long-term durability even at a high current density of 300 mA cm −2 , surpassing its counterparts and benchmark Pt/C catalyst. Density functional theory calculations validate that the tensile strain optimizes the d -band states, water dissociation, and hydrogen adsorption kinetics of the strained Mo 2 N in Co/Mo 2 N, thereby improving its catalytic efficacy. This work provides valuable insights into controlling lattice strain to develop highly efficient electrocatalysts towards advanced electrocatalytic applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 12
·10661-10668
·
IF 9.5
Luo Li,Zhou Xiaolan,Xu Xiaozhi,Zhao Zhuo,Pu Chaodan
The impact of alkali metal carboxylates on the synthesis of colloidal quantum dots (CQDs) was investigated. Through a ligand removal experiment, we demonstrated that due to its high hydrophilic nature, sodium oleate dispersed in n-octadecene (ODE) with the formation of micelles with the help of other polar molecules, which resulted in reduced concentration of oleic acid and cadmium oleate both in the solution and on the surface of CQDs. These effects allow for control the size of CdSe CQDs in a wide range when synthesizing them by solely changing the amount of sodium oleate, under either cation-rich or anion-rich conditions. Additionally, enhanced ligand dynamics promote morphology transformation and suppress size deviation caused by different morphologies’ existence in CQDs synthesis. Alkali metal oleate not only stabilized anion-rich CdSe CQDs but also results in highly crystallized wurtzite structure of CdSe CQDs when synthesizing them with excess anions. Furthermore, under anion-rich synthetic condition, anisotropic growth can be realized, leading to nanorods and nanoplatelets based on the alkali metal ions used. Given their outstanding effects and widely applicable synthetic conditions, alkali metal carboxylates offer new possibilities for designing efficient methods for synthesizing CQDs.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Carbon Letters
·
2023
·Vol. 33
·期 4
·1045-1055
·
IF 4.5
Yu Yifan,Wang Ruyuan,Li Meilin,Li Shanshan,Fan Aiping
The present studies explored the possibility of immobilizing phosphocholine (PC) liposomes on the surface of graphene oxide (GO) which was pre-adsorbed with two kinds of enzymes, horseradish peroxidase and glucose oxidase. The transmission electron microscope images showed that the PC liposomes adsorbed onto the GO surface kept integrity. By using 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS)-encapsulated liposomes, a one-step colorimetric assay for glucose was developed. In the presence of glucose, the GO nanocomposites catalyzed the cascade enzymatic reaction producing colorimetric signals directly. Under the optimal conditions, the GO nanocomposites produced linearly increased colorimetric signal with increased concentrations of glucose ranging from 50 to 500 µM. The detection limit was 33 µM. The GO nanocomposites also exhibited good selectivity for the detection of glucose and were able to detect glucose in human serum. Graphical abstract
研究领域:
生物化学
·
纳米技术
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2021
·
IF 5.485
Kang Yang,Chuanfeng Wang,Yingbo Chen,Jiaopeng Xu,Lei Sun,Siran Liu
Carboxymethyl Cellulose Sodium (CMC) is widely used in paper-making and textile industries, and the treatment of CMC wastewater containing salt and alkali has become one of the hot spots in the field of wastewater treatment . In this study, poly(vinyl alcohol) (PVA)/polytetrafluoroethylene (PTFE) membranes were prepared through non-solvent induced phase inversion (NIPS) and cross-linking for the separation of CMC and salt-alkali. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology and surface properties of the membranes. The results showed that both heat cross-linking and chemical cross-linking with glutaraldehyde (GA) improved the structural stability of the PVA/PTFE membranes. The salt-alkali optional transmitting rate (OTR), the CMC rejection rate, and the flux of the heat cross-linked PVA/PTFE membrane and chemical cross-linked PVA/PTFE membrane are 93.0%, 99.3%, 220.00 (L/m 2 h) and 93.4%, 99.4%, 89.20 (L/m 2 h) at 0.2 MPa, respectively. Besides, the GA cross-linked PVA/PTFE membrane showed stable and efficient separation performance in the test of separating CMC. Therefore, the resultant membrane can be used for the separation of CMC, salt, and alkali, providing a new idea for the treatment of high-salt-alkali cellulose wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 10
·100541
·
IF 3.721
Zhaohui Han,Yang Xu,Shenggang Zhou,Lei Xu,Peixian Zhu
In this study, an Al-0.08Sn-0.08Ga-0.5Mg alloy was annealed at 200 °C–400 °C for 10 h. The microstructure and corrosion morphology of the Al anode were observed by scanning electron microscopy (SEM), and the effects of different annealing temperatures on the electrochemical properties of the Al anodes were studied by the hydrogen evolution rate, open circuit potential, Tafel curves, EIS and constant current discharge. The results show that the annealing treatment had a certain effect on the number and size of precipitates on the alloy surface, which improved the electrochemical activity and corrosion resistance of the Al alloy. Additionally, the Al–Sn–Ga–Mg alloy anode material has an excellent discharge performance in the actual use process when the annealing temperature is 350 °C, the related performance parameters were greatly improved compared with other annealing temperature conditions. The capacity density is 2670.99 mAh·g−1, and the energy density is 3379.15 mWh·g−1.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）