Journal of Materials Chemistry A
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2023
·Vol. 12
·期 2
·943-949
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IF 11.9
Yalei Wang,Jun Song,Wai-Yeung Wong
Polyaniline (PANI) hydrogels are promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to their inherent porous structure and redox activity. However, the instability during the repeated charge/discharge process limits their application in commercial battery systems. Herein, PANI/MXene hydrogels are synthesized by grafting the negatively charged MXene with the aniline monomer followed by a rapid chemical oxidative polymerization reaction. After combining MXene nanosheets with the PANI chains, the hybrid hydrogels show a three-dimensional (3D) network structure of MXene nanosheets interconnected with PANI chains through hydrogen bond interactions, thus greatly improving the electrochemical reactivity and stability. Moreover, the 3D PANI/MXene network structure can provide fast transport channels for ions and electrons. Consequently, the PANI/MXene cathodes not only achieve a high capacity of 219.0 mA h g−1 at 0.2 A g−1, but also exhibit outstanding rate performance (147.5 mA h g−1 at 5 A g−1), together with excellent long-term cycling stability (over 5000 cycles with a capacity retention of 88.3%). The Zn2+ and CF3SO3− insertion/extraction mechanisms are further revealed by ex situ X-ray photoelectron spectroscopy (XPS) measurements. This work demonstrates the availability of conducting polymer hydrogels as cathode materials for high-performance AZIBs.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 38
·9237-9245
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IF 7
Jiawei Lv,Saicuo Wang,Chunxuan Qi,Muheman Li,Yuqing Sun,Yuan Yang,Cheng Zeng,Richao Shen,Hengchang Ma
The large-scale transmission and infection of pathogens worldwide have encouraged scientists to develop new antibacterial agents that do not succumb to bacterial resistance, which is not only of significant research interest but also challenging. In this work, we fabricated two main-chain (MC)-type cationic polymers (TPE-ammonium polymer and TPE-phosphonium polymer) through a one-step 100% atomic economic reaction. The two polymers demonstrated very promising antibacterial activity and their minimal inhibitory concentration (MIC) values are lower than that of most previously reported antibacterial agents. Especially, the phosphonium-doped MC polymer exhibited very small MICs of 0.24 and 0.98 μg mL−1 against S. aureus and E. coli, respectively. This excellent antibacterial performance by the TPE-phosphonium polymer is attributed to the advantages of the MC-type polymer such as its large molecular weight (Mn = 103 011) and stronger polarization effect from the P atom. More impressively, depending on the typical aggregation-induced emission (AIE) property and excellent antibacterial behaviors, the TPE-phosphonium polymer was successfully used for bacterial imaging and real-time monitoring of bacterial viability.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Changcheng Cui,Junjie Fu,Dongxing Kou,Yimeng Li,Hao Wei,Zucheng Wu,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Shuping Pang,Zhipeng Shao,Sixin Wu,Guanglei Cui
The Cu 2 ZnSn(S,Se) 4 solar cells (CZTSSe) are emerging as a hot area of low-cost thin film photovoltaic technology owing to its non-toxicity and excellent photoelectric properties. However, the large open-circuit voltage deficit ( V oc,deficit ) caused by the inherently defective CdS/ CZTSSe heterojunction interface is still a huge challenge for improving power conversion efficiency. Herein, we reconstruct the heterojunction interface by inserting a CZTSSe:In into the CdS/CZTSSe heterojunction through an In 2 Se 3 post-deposition treatment. The local occupation of In 3+ at Zn 2+ and Sn 4+ sites decreases the disordered Zn- and Sn-related deep defects and generates benign In Zn donors within CZITSSe transition layer simultaneously, which effectively enhances the surface p-to-n conversion. The combination of chemical and field-effect passivation regulates the charge extraction and passivates the charge recombination. As a result, the In element-buried absorber enables the V oc boost from 488 to 527 mV with an impressive active-area efficiency of 13.59 %. These results demonstrate the great potential of the In element-buried absorber in alleviating the V oc,deficit and enhancing the performance of CZTSSe solar cells.
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Coatings
·
2023
·Vol. 13
·期 9
·1557
·
IF 3.4
Yan Gao,Xin Chen,Ping Xu,Jie Chen,Shihua Yu,Zhigang Liu,Xiaodan Zeng
A novel magnetic fluorescent nanoprobe (Fe3O4@ZnS@MPS(MFNPs)) was synthesized, which recognized and cooperated with Ag+ions, and a rapid method for detecting Ag+was established in solution. It was found by fluorescence spectroscopy analysis that the MFNPs could detect Ag+in PBS solution and, upon addition of Ag+ions, the fluorescence (FL) of MFNPs could be quenched significantly. The sensor has a low limit of detection (LOD) of 7.04 µM for Ag+. The results showed that MFNPs were extremely specific and sensitive for the quantitative detection of Ag+over a wide pH range. Then, the recognition mechanism between MFNPs and guest Ag+was explored via measures of infrared spectroscopy and electron microscopy. It was speculated that the oxygen atoms in the sulfonic acid group cooperated with Ag+to form a synergistic complexation. The assay was successfully used to determine the content of Ag+ in real samples.Keywords:magnetic fluorescent nanosensor;selective recognition;silver ion;3-sulfhydryl-1-propane sodium (MPS)
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Journal of the Iranian Chemical Society
·
2023
·Vol. 20
·期 5
·1145-1154
·
IF 2.4
Liu Jun,Lan Lixin,Liu Xuanyan,Zhou Quan,Li Rong
In this paper, Cu x OAu–ZnO nano-catalysts with different morphologies were synthesized by one-step replacement method. The nano-catalysts are characterized by scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. These novel Cu x OAu–ZnO nano-catalysts exhibit exceptionally high stability and superior 4-nitrophenol to 4-aminophenol hydrogenation ability. The relationship between catalytic performances and changes of composition were investigated, and the catalytic activity decreased in the following order: Cu x O 30 Au 35 –ZnO > Cu x O 38 Au 35 –ZnO > Cu x O 21 Au 45 –ZnO. The influence of catalytic conditions for the performance of catalysts has also studied. For the Cu x O 30 Au 35 –ZnO catalysts, the rate constant k app could be up to 18.6 × 10 −3 s −1 , and the conversion of the 4-NP could still reach 98.66% after five cycles. The high activity of Cu x O 30 Au 35 –ZnO may be attributed to the synergistic effect between Au and Cu element. The unique structure and high catalytic performance make Cu x OAu–ZnO nano-catalysts for practical applications in 4-nitrophenol reduction.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Fanyun Su,Qi Meng,Xiaojian Liu,Wan Yang,Yanxi Chen,Juan Yang,Jingjing Tang,Hui Wang,Yayun Ma,Xiangyang Zhou
With the annual increase in lithium-ion batteries (LIBs) disposal, valuable resources are being generated with worrying waste, so it is strategically important to recover the critical metals from them. Individual high temperature or leaching processes do not apparently achieve very satisfactory results. In the present work, the reduction with zinc powder was able to convert the lithium in LiNi x Co y Mn z O 2 (NCM) to soluble LiOH, while the reduction and ammonia complexation environment generated by the decomposition of cysteine (Cys) achieved an efficient leaching of transition metals without additional additives. The leaching efficiency of Li can reach more than 92 %, while that of Ni/Co/Mn reaches more than 97 % through the regulation of the parameters of each process. In particular, an in-situ redox mechanism is proposed to explain the efficient leaching of transition metals, which further enriches the theory of spent LIBs recycling and provides a promising idea for various hydrometallurgical extraction systems.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiaoli Lin,Panke Zhou,Yiqun Gao,Tao Li,Xiong Chen,Haohong Li,Rong Jiang,Zhirong Chen,Huidong Zheng
Polysulfide-based multilevel memorizers are promising as novel memorizers, in which the occurrence of Sn2– relaxation is key for their multilevel memory. However, the effects of crystal packing and the side group of organic ligands on Sn2– relaxation are still ambiguous. In this work, ionic [Zn(S6)2·Zn2(Bipy)2SO4 (1), Zn(S6)2·Zn(Pmbipy)3 (2)] and neutral [ZnS6(Ombipy) (3), ZnS6(Phen)2 (4)] Zn/polysulfide/organic complexes with different packing modes and structures of organic ligands have been synthesized and were fabricated as memory devices. In both ionic and neutral Zn complexes, the S62– relaxation will be blocked by steric hindrances due to the packing of counter-cations and hydrogen-bond restrictions. Consequently, only the binary memory performances can be seen in FTO/1/Ag, FTO/2/Ag, and FTO/4/Ag, which originate from the more condensed packing of conjugated ligands upon electrical stimulus. Interestingly, FTO/3/Ag illustrates the unique thermally triggered reversible binary–ternary switchable memory performance. In detail, after introducing a methyl group on the 6′-position of bipyridine in ZnS6(Ombipy) (3), the ring-to-chain relaxation of S62– anions at room temperature will be inhibited, but it can happen at a higher temperature of 120 °C, which has been verified by elongated S–S lengths and the strengthened C–H···S hydrogen bond upon heating. The rules drawn in this work will provide a useful guide for the design of stimulus-responsive memorizers that can be applied in special industries such as automobile, oil, and gas industries.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhongming Wang,Xiong Shen,Jinhe Wei,Lin Chen,Fei Hu,Fanfan Qi,Qiuyun Ouyang
Carbon quantum dots (CQDs) were prepared by a thermal cracking method; amino-modified CQDs (NH2-CQDs) were synthesized by a hydrothermal method, and zinc-reduced CQDs (Zn-CQDs) were synthesized by a mild method. Optical properties and stability are two key issues for further applications of CQDs. In this study, we report a simple and effective method to simultaneously improve the optical properties and stability of CQDs. We generated Zn-CQDs by reacting zinc powder with CQD solution, which was operated under mild conditions and completed in a short time. These three materials were placed in an air environment for 48 h. The results show significantly improved moisture resistance of Zn-CQDs compared to the other two materials. The exciton binding energy of Zn-CQDs was calculated by the temperature-dependent fluorescence emission spectra to be 208.7 meV, which is much higher than those of 49.9 meV for CQDs and 46.6 meV for (NH2)-CQDs. This indicates that Zn-CQDs exhibit more stable internal exciton states, a higher degree of crystal ordering, and better moisture resistance. Due to the good moisture resistance and excellent photoluminescence properties of Zn-CQDs, their solid powders were used as color conversion materials for making fluorescence-excited LED devices. Finally, a blue light-emitting LED with a stable and bright color was obtained.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Yang Liu,Feng-Qi Shi,Xin Hao,Meng-Yu Li,Lin Cheng,Cheng Wang,Kai-Yao Wang
Efficient adsorption of radioactive 137 Cs + and 60 Co 2+ and their decay products 137 Ba 2+ and 60 Ni 2+ bears significance for hazard elimination in case of nuclear emergency, which relies on the adsorption rate enhancement that takes advantages of compositional and structural optimization. Herein, we report a zinc-doped selenidostannate constructed from T2-supertetrahedral clusters, namely K 3.4 (CH 3 NH 3 ) 0.45 (NH 4 ) 0.15 Zn 2 Sn 3 Se 10 ·3.4 H 2 O ( ZnSnSe‐1K ). The soft Se and micro-porosity synergistically endow this material with a binding affinity to Cs + , Ba 2+ , Co 2+ , and Ni 2+ ions and ultrafast kinetics with R > 97.6% in 2–60 min. In particular, ZnSnSe‐1K can remove 99.34% of Cs + in 2 min ( K d Cs > 1.5 × 10 5 mL g −1 ), contributing to a record rate constant k 2 of 9.240 g mg −1 min −1 that surpasses all metal chalcogenide adsorbents. ZnSnSe‐1K exhibits good acid/base tolerance (pH = 0–12), and the adsorption capacities at neutral are 253.61 ± 9.15, 108.94 ± 25.32, 45.76 ± 14.19 and 38.49 ± 2.99 mg g −1 for Cs + , Ba 2+ , Co 2+ , and Ni 2+ , respectively. The adsorption performances resist well co-existing cations and anions, and the removal rates can keep above or close to 90% even in sea water. ZnSnSe‐1K is employed in continuous column and membrane filtration, both of which shows excellent elimination efficiency ( R > 99%) for mixed Cs + , Ba 2+ , Co 2+ , and Ni 2+ . Especially, the membrane with an ultrathin (70 µm) ZnSnSe‐1K layer can remove 97–100% Cs + in suction filtration with a short contact time of 0.33 s. Combined with the simple synthesis, facile elution and great irradiation resistance, ZnSnSe‐1K emerges as a selenide adsorbent candidate for use in environmental remediation especially that involving nuclear waste disposal .
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Materials Today Physics
·
2023
·
IF 11.5
Mengran Sun,Chunxiao Li,Jinlong Shi,Ming-Hsien Lee,Jiyong Yao
As promising candidate for mid- and far- infrared (MFIR) nonlinear optical (NLO) materials, diamond-like (DL) chalcogenides have been extensively studied because of their considerable advantages. Among them, tellurides attract our attention as their stronger electron polarization and wider transmittance range than those of sulfides and selenides . Herein, the insightful structural characteristics and NLO properties of defect DL MGa 2 Te 4 (M = Zn, Cd) were studied for the first time at experimental and theoretical level. They crystallize in the non-centrosymmetric I -4 space group (No.82), with a three-dimensional structure consisting of highly oriented [MTe 4 ] and [GaTe 4 ] tetrahedra, which can be viewed as derived from AgGaS 2 (AGS). Experimental results illustrate that MGa 2 Te 4 (M = Zn, Cd) exhibits moderate band gaps, strong SHG intensities about 4.9–10.6 times that of AGSe at 90–125 μm, and congruent-melting behavior. Theoretical calculations based on E-field DFPT method indicate that the tremendous SHG tensors d 14 of ZnGa 2 Te 4 and CdGa 2 Te 4 are 127.67 and 105.19 pm/V. SHG-density analysis reveals that the lone-pair packets of Te ions in [GaTe 4 ] units are the main source of SHG responses. In addition, calculations on Mulliken bond order index imply that the main difference between these two crystals is the bonding modes of M−Te. Special care was also given to ensure convergence of k -mesh for both conventional and primitive cells of the crystals, with two different methods for calculating linear and non-linear optical properties compared side by side. This work demonstrates the potential applications of these two defect DL tellurides in the MFIR NLO field .
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Colloid and Interface Science Communications
·
2023
·
IF 4.5
Shihui Jiao,Mingyu Shang,Yan Chen,Guangsheng Pang
The in situ anchoring of metal elements on the surface of nanomaterials is a state-of-the-art technology that can significantly enhance the performance of materials. We have successfully fabricated noble metal-ion modified rutile TiO 2 nanobars, which exhibit exceptional catalytic activity in both H 2 generation and CO oxidation. Firstly, we synthesized Ti 3+ self-doped rutile TiO 2-x nanobars by a simple solvothermal method using Zn as a reductant, resulting in highly crystalline structures with a significant proportion of (110) surfaces. The reduced nanobars chemically absorb the noble metal cations with the addition of a solution of a noble metal salt in the absence of light to form in situ noble metal-ion modified catalysts. TiO 2 nanobars with 1 wt% Pt 2+ and Pd 2+ exhibited excellent performance in photocatalytic H 2 generation from water and low temperature CO oxidation. Moreover, the samples modified with low noble metal ions (0.1 wt%) also show effective activity in H 2 generation.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Hong Zhang,Lizhuang Yang,Haozhi Wang,Bingfeng Cui,Jingxian Wang,Xiaopeng Han,Wenbin Hu
Dendrites and side reactions of Zn anodes severely restrict the application of aqueous Zn-based batteries for grid-scale energy storage. While surface/interface modification strategies have shown some progress in improving Zn anode reversibility, they still fall short in addressing the overall regulation and intrinsic mechanisms from the bulk-phase perspective. Herein, a bulk-phase composite Zn/CNTs anodes fabricated by a powder-metallurgy-based strategy is introduced. Benefiting from the regulation of grain boundary engineering on local electric conductivity, electric field distributions, and Zn atom absorption energy, the Zn/CNTs anodes effectively suppress dendrite growth and enhance corrosion resistance during Zn stripping/plating cycles. Symmetrical cells equipped with Zn/CNT4 anodes exhibit extended cycling stability with minimal voltage hysteresis (only 22 mV). Furthermore, the full cells incorporating Zn/CNT4 with commercial MnO 2 demonstrate superior rate performance and specific capacitance retention after 500 h cycling. This breakthrough opens up new avenues for optimizing metallic anodes at the bulk phase level using powder metallurgy, enabling scalable manufacturing processes, and providing valuable insights for various metal anode systems.
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