Nanomaterials
·
2022
·Vol. 12
·期 5
·886
·
IF 5.719
Qianwen Jin,Yajing Yan,Chenchen Hu,Yongguang Zhang,Xi Wang,Chunyong Liang
The advantages of high energy density and low cost make lithium–sulfur batteries one of the most promising candidates for next-generation energy storage systems. However, the electrical insulativity of sulfur and the serious shuttle effect of lithium polysulfides (LiPSs) still impedes its further development. In this regard, a uniform hollow mesoporous Ni(OH)2@CNT microsphere was developed to address these issues. The SEM images show the Ni(OH)2delivers an average size of about 5 μm, which is composed of nanosheets. The designed Ni(OH)2@CNT contains transition metal cations and interlayer anions, featuring the unique 3D spheroidal flower structure, decent porosity, and large surface area, which is highly conducive to conversion systems and electrochemical energy storage. As a result, the as-fabricated Li-S battery delivers the reversible capacity of 652 mAh g−1after 400 cycles, demonstrating excellent capacity retention with a low average capacity loss of only 0.081% per cycle at 1 C. This work has shown that the Ni(OH)2@CNT sulfur host prepared by hydrothermal embraces delivers strong physical absorption as well as chemical affinity.Keywords:Li-S battery;carbon nanotube;nickel hydroxide;cathode
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2015
·
IF 1.981
Wei-Qiang Song,Yue-Zhi Cui,Fu-Rong Tao,Jin-Ku Xu,Tian-Duo Li,Ai-Qing Wang
Four conjugated polymers (P 1 , P 2 , P 3 and P 4 ) based on poly(fluorenylene ethynylene)s (PFEs) have been synthesized by introducing 9,9-diphenylfluorene units and/or thiophene units into the backbone of PFEs. These exotic units remarkably change the behaviors of polymer, such as the solubility, the peak wavelengths of the optical spectra , and the spectral red-shift of solid polymers, etc. As sensing materials for detecting nitroaromatics, all the four polymers show observable fluorescence quenching when DNT exists. For example, in DNT/THF solution, the quenching efficiencies ( η EP ) of P 2 and P 4 are 95% and 90% at quenching equilibrium respectively, which are much higher than those of P 1 (77%) and P 3 (72%). The high η EP of P 2 and P 4 may be ascribed to the electron-rich character of thiophenylene units which can facilitate the electron-transfer between polymer and DNT. However, in another case of polymer films in DNT vapor, P 3 shows higher quenching efficiency even than P 2 at quenching equilibrium, which may be attributed to the fact that the steric hinderance of 9,9-diphenylfluorene units in P 3 can improve the permeability of the film sensor. P 4 , which contains both thiophenylene and 9,9-diphenylfluorene units, shows the highest quenching efficiency of 91% in DNT vapor at quenching equilibrium.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
MRS Communications
·
2022
·Vol. 12
·期 5
·780-785
·
IF 2.935
Zhang Jianqiao,Luo Fengting,Pi Mingyu,Ran Feng,Chen Shijian
The development of non-noble metal-based electrocatalysts is still a challenge for electrochemical water-splitting technology. Herein, we successfully fabricated a novel three-dimensional sulfur (S)-doped WP 2 nanowires (NWs) on carbon cloth (CC) as a self-supported electrode for electrocatalytic HER in alkaline media. The optimized S-doped WP 2 NWs acquire the low overpotentials of 180 mV at 100 mA cm −2 . The S-doping is proved to enlarge the specific surface area, reduce the charge transfer resistance, and optimize the electronic structure of WP 2 NWs/CC. This study opens an avenue for enhancing the electrocatalytic activity via non-metal doping. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 14
·3643-3653
·
IF 7.779
Caihong Fang,Deliang Zhang,Xin Wang,Ran Li
Ni-, Co-based (oxy)hydroxides have received considerable attentions as promising electrocatalysts for the oxygen evolution reaction (OER), urea oxidation reaction (UOR), and even overall urea/water splitting. Constructing catalysts with a special morphological and electronic structure is still an effective strategy to further enhance their electrocatalytic performances. Herein, we report a facile, versatile, and scalable method to grow S-incorporated CoNiFe(oxy)hydroxides (CoNiFeS–OH) nanosheets on needle-like CoNi(oxy)hydroxides (CoNi–OH) nanoarrays under hydrothermal conditions. The special morphology provided more active sites and facilitated mass transfer. In particular, Fe and S incorporation modified the electronic structure of CoNi–OH, boosts its electronic conductivity, provided metals in high valent states, and created a crystalline/amorphous phase interface, thus intrinsically improving the electrocatalytic performance toward OER, UOR, and even overall water splitting/urea electrolysis. The CoNiFeS–OH nanosheets therefore showed superior OER activity with a low overpotential of 192 and 272 mV to reach a current density of 10 and 100 mA cm−2, respectively. For UOR, the potential was measured to be as low as 1.329 and 1.373 V at a current density of 10 and 100 mA cm−2, respectively. Furthermore, a quite low cell voltages of 1.571 and 1.461 V for overall water splitting and overall urea electrolysis were respectively detected to reach a current density of 10 mA cm−2, which were superior to the benchmark Pt/C//RuO2 and other reported Ni, Co-based (oxy)hydroxides. More importantly, the voltage differences required for overall urea electrolysis and overall water splitting at a current density of 10 and 100 mA cm−2 were 0.110 and 0.153 V. Additionally, the CoNiFeS–OH electrocatalysts also showed great stability during long-term (20 h) and cycling (1000 cycles) measurements.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 10
·4189-4203
·
IF 3.417
Zhang Xiuqiang,Zhang Jinlong,Dong Lili,Ren Suxia,Wu Qinglin,Lei Tingzhou
We report a series of thermoresponsive cellulose nanocrystals (CNCs) decorated with poly(poly(ethylene glycol) methylacrylate) copolymers (poly(PEGMA)- g -CNCs) synthesized by surface initiated-atom transfer radical polymerization (SI-ATRP). The chemical structures and surface morphologies were subsequently confirmed by FT-IR, XPS, and AFM measurements. With regard to thermally responsive behavior, poly(PEGMA)- g -CNCs show tunable lower critical solution temperature (LCST) values in the range of 34–66 °C by varying the feeding ratios of comonomers. The reversible morphological transformation from individual nano-rod structures to larger globule aggregates was further verified by AFM during the LCST transition. These functionalized CNCs have potential as smart film filters and biosensors.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 68
·期 5
·1369-1386
·
IF 1.215
Chen Pei,Chen Xinbing,An Zhongwei
A series of covalently and ionically crosslinked sulfonated poly(arylene ether ketone)s (SPAEKs) were prepared via the cyclocondensation reaction of crosslinkable SPAEKs with 3,3′-diaminobenzidine to form quinoxaline groups, where crosslinkable SPAEKs were synthesized by copolymerization of 4,4′-biphenol with 2,6-difluorobenzil, 4,4′-difluorobenzophenone, and 5,5′-carbonyl-bis(2-fluorobenzene sulfonate). The SPAEK membranes had high mechanical properties and the isotropic membrane swelling. The covalent and ionical crosslinking significantly improved the membrane performance, i.e., the crosslinked membranes showed the lower membrane dimensional change, lower methanol permeability, and higher oxidative stability than the corresponding uncrosslinked membranes, with keeping the reasonably high proton conductivity. The crosslinked membrane ( CK3 ) with measured ion exchange capacity of 1.62 mequiv g −1 displayed a reasonably high proton conductivity of 110 mS/cm with water uptake of 33 wt% at 80 °C, and exhibited a low methanol permeability of 1.7 × 10 −7 cm 2 s −1 for 32 wt% methanol solution at 25 °C. The covalently and ionically crosslinked SPAEK membranes have potential for polymer electrolyte membrane fuel cells and direct methanol fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yanchun Yang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
Alkali metal doping plays a crucial role in fabricating high-performance Cu(In,Ga)(S,Se)2 and Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells. In this study, we report the first experimental observation and characterizations of the alloyed LixCu2–xZnSn(S,Se)4 thin films. It is found that Cu+ ions in Cu2ZnSn(S,Se)4 thin films can be substituted with Li+ ions, forming homogeneous LixCu2–xZnSn(S,Se)4 (0 ≤ x ≤ 0.29) alloyed thin films. Consequently, the band gap, conduction band minimum, and valence band maximum of LixCu2–xZnSn(S,Se)4 thin films are profoundly affected by Li/Cu ratios. The band alignment at the LixCu2–xZnSn(S,Se)4/CdS interface can be tuned by changing the Li/Cu ratio. We found that the photovoltaic parameters of the LixCu2–xZnSn(S,Se)4 solar cell devices are strongly influenced by the Li/Cu ratios. Besides, the lattice constant, carrier concentration, and crystal growth of LixCu2–xZnSn(S,Se)4 thin films were studied in detail.
研究领域:
材料科学
·
太阳能技术
·
半导体物理
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 36
·6019-6025
·
IF 3.117
Junli Wang,Fan Guan,Lijun Zhao,Longhua Li,Junhao Zhang,Tingting Wang
Composition engineering is an active topic of research for optical and electronic (nano)crystals and functional materials. We here demonstrate the control over the ratios and distributions of selenium and sulfur in ternary Sb2(Se,S)3 alloy nanorods (NRs), which were synthesized from a molecular chalcogen precursor, selenium disulfide (SeS2). By increasing the anion/cation precursor ratios (SeS2/SbCl3) from 0.5 : 1 to 1 : 1 and 1.5 : 1, an increase in both the Se fractions and the lengths × diameters of NRs is achieved with the Se and S distributions in Sb2(Se,S)3 varying from homogeneity to inhomogeneity. Within the inhomogeneous NRs obtained at high SeS2/SbCl3 ratios containing excessive chalcogen (Se + S), S decreases but Se increases from the center to the periphery as revealed by EDS elemental analyses performed on individual NRs. In particular, the 1D growth anisotropy of NRs allows for a large chalcogen concentration gradient along the axial direction of the resulting NRs from their middle to the two ends. Such non-uniform Se and S distributions can be rationally interpreted by analyzing the growth kinetics and processes of Sb2(Se,S)3 NRs and would give rise to uncommon (opto)electronic properties towards future nanowire-based devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jianwen Feng,Huan Yi,Zhiwen Lei,Jun Wang,Hongbo Zeng,Yonghong Deng,Chaoyang Wang
Poor cycling performance caused by the shuttle effect of polysulfides is the main obstacle in the development of advanced lithium–sulfur (Li–S) batteries. Functional polymer binders with polar groups can effectively adsorb polysulfides chemically, thereby suppressing the shuttle effect. Herein, a robust three-dimensional crosslinked polymer network, which demonstrates excellent mechanical property and strong affinity for polysulfides , is prepared by the aldimine condensation and coordination reactions. The crosslinked chitosan sulfate network (CCSN) significantly enhances the cycling performance and rate capability of the sulfur cathode. The CCSN-based sulfur cathode exhibits a high initial discharge capacity of 824 mAh g −1 with only 0.082% average capacity loss per cycle at 1 C. At a high rate of 4 C, the cathode exhibits a high capacity retention of 84.8% after 300 cycles. Moreover, the CCSN-based sulfur cathode exhibits an excellent cycling performance at a high sulfur loading of 2.5 mg cm −2 , which indicates the excellent mechanical strength and binding performance of the CCSN binder for high-energy density Li–S batteries. This study demonstrates a viable approach for developing high-performance Li–S batteries for practical application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2020
·
IF 3.023
Hong-Yi Wang,Jia-Wei Tang,Peng Peng,Hai-Jun Yan,Fu-Li Zhang,Shao-Xin Chen
We first developed a novel and efficient chemoenzymatic process to prepare (S)-1-(pyridin-4-yl)-1,3-propanediol, a vital HepDirect prodrug intermediate, from inexpensive and commercially available isonicotinic acid. Through this process, we provide a creative way to obtain the key chiral intermediate, β-hydroxyester, with ketoreductase (KRED) EA. After optimization of the process, we performed the reaction on a 100 g scale with a substrate concentration of up to 150 g/L, a yield of 93%, and an ee value of up to 99.9%. Additionally, we used a simple and effective NaBH4/MgCl2 reduction system to obtain (S)-1-(pyridin-4-yl)-1,3-propanediol with >99.9% ee and an 80% yield. This novel chemoenzymatic process has the potential to be a cost-effective and environmentally friendly process suitable for industrial use.
研究领域:
生物化学
·
制药工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 34
·18477-18487
·
IF 12.732
Menghua Yang,Xuewei Wang,Jinfeng Wu,Yue Tian,Xingyu Huang,Ping Liu,Xianyang Li,Xinru Li,Xiaoyan Liu,Hexing Li
Lithium sulfur (Li–S) batteries have been investigated as ideal candidates for future high-density energy storage systems with the advantages of abundant reserves, high energy density and competitive cost. The key issues are the severe shuttling of polysulfides and sluggish redox kinetics. Herein, we report a novel metal–organic framework-derived Co2P–ZnS/ZnS–C nanocomposite constructed from inner Co2P–ZnS and outer ZnS–C heterostructures. Both the experimental results and theoretical calculations demonstrated that these dual electrocatalytic heterostructures enabled strong affinity with polysulfides and facilitated the reaction kinetics. Meanwhile, the hollow carbon polyhedron provided fast electron/ion transfer channels and effectively buffered volume expansion during cycling. As anticipated, a high initial capacity of 1503 mA h g−1 was achieved at 0.2C with Co–Zn/Zn–C/S as a cathode, together with excellent stability after 500 cycles at 1C. Even a high reversible capacity of 540 mA h g−1 was achieved at 1C after 200 cycles under an elevated sulfur loading of 3.65 mg cm−2. This work presents a new strategy for designing dual electrocatalytic hosts for immobilization and conversion of polysulfides, which may offer more opportunities as cathodes in stable Li–S batteries with high energy density.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Ziyang Jia,Hongzhang Zhang,Ying Yu,Yuqing Chen,Jingwang Yan,Xianfeng Li,Huamin Zhang
Lithium–sulfur (Li–S) batteries have great potential as an electrochemical energy storage system because of the high theoretical energy density and acceptable cost of financial and environment. However, the shuttle effect leads to severe capacity fading and low coulombic efficiency. Here, graphitic carbon nitride (g–C 3 N 4 ) is designed and prepared via a feasible and simple method from trithiocyanuric acid (TTCA) to anchor the polysulfides and suppress the shuttle effect. The obtained g–C 3 N 4 exhibits strong chemical interaction with polysulfides due to its high N–doping of 56.87 at%, which is beneficial to improve the cycling stability of Li–S batteries. Moreover, the novel porous framework and high specific surface area of g–C 3 N 4 also provide fast ion transport and broad reaction interface of sulfur cathode, facilitating high capacity output and superior rate performance of Li–S batteries. As a result, Li–S batteries assembled with g–C 3 N 4 can achieve high discharge capacity of 1200 mAh/g at 0.2 C and over 800 mAh/g is remained after 100 cycles with a coulombic efficiency more than 99.5%. When the C–rate rises to 5 C, the reversible capacity of Li–S batteries can still maintain at 607 mAh/g.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）