NANO
·
2022
·
IF 1.438
Hong Zhao,Zhenghua Du,Diandian Liu,Yijian Lai,Tao Yang,Mingyan Wang,Yuesheng Ning,Fujun Yin,Binyuan Zhao
The design and construction of semiconductor–metal heterojunctions are being considered to be an effective way to overcome the limited visible-light absorption of semiconductors. Herein, a facile and scale approach is reported for the first time to synthesize Cu/ZnO heterojunctions by one-step galvanic replacement between Zn and cuprous solution reaction. Two kinds of morphologies Cu/ZnO heterojunctions could be obtained by changing cuprous salt anion such as Br − , Cl − and I − . A flower-like Cu/ZnO heterostructured is chosen as a representative to demonstrate the facility and enhanced photocatalytic performance toward Rhodamine B degradation under visible-light irradiation. Results showed flower-like Cu/ZnO heterojunctions have higher photocatalytic performance than the other two morphologies. The galvanic replacement growth mechanism of Cu/ZnO heterojunctions was also further investigated. It is found that Cu/ZnO heterojunctions formed from Zn and Cu 2 O at an acid solution and room condition. This work indicates that galvanic replacement reaction at room temperature is an excellent technique to grow Cu/ZnO heterojunctions and demonstrates that the hole and electron transfer between Cu and ZnO can efficiently enhance their photocatalytic performance. This general method can also be further explored to guide the design of metal/metal oxide heterostructured on other substrates, such as Zn, Ni and Cu foils.
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Solar RRL
·
2022
·Vol. 6
·期 6
·2101032
·
IF 9.173
Junjie Fu,Qingwen Tian,Yachao Du,Qianqian Chang,Yanping Guo,Shengjie Yuan,Zhi Zheng,Sixin Wu,Shengzhong (Frank) Liu
The photovoltaic performance of the kesterite Cu 2 ZnSn(S,Se) 4 solar cells is still far below its predecessor CuInGaSe 2 . One major reason is its severe interface nonradiative recombination at the mismatched Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface, leading to a large open-circuit voltage loss. Herein, a distinctive indium-incorporation (DI) strategy is developed to deposit an In 1− x Cd x S buffer layer for optimizing the heterojunction interface. The results reveal that adopting this DI method can effectively inhibit the formation of an undesirable secondary phase, and indium can be more easily doped into the bulk lattice of CdS to form additional beneficial shallow donor In Cd defects, which significantly improve the electrical properties of the CdS layer and the quality of the heterojunction interface. Besides, the energy band alignment is adjusted to facilitate the extraction and transfer of interfacial charges, and thus reducing the nonradiative charge recombination at the front Cu 2 ZnSn(S,Se) 4 /CdS heterojunction interface. Consequently, the combination of the above enhances the power conversion efficiency from 10.2% to 12.4%, one of the highest for this type of cells, which corresponds to an open-circuit voltage deficit ( V oc,def ) reduction to as low as 0.54 V. The strategy provides a rational design for optimizing the heterojunction interface of Cu 2 ZnSn(S,Se) 4 solar cells to reduce voltage loss and achieve high efficiency.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wensen Liu,Hui Su,Jian Zhang,Lina Wang,Yahui Liu,Jie Liang,Zhaowu Zhu
The hydrometallurgical process for the recovery of nickel and cobalt requires a complex and expensive impurity removal process. Solvent extraction is widely used in industry for the separation, purification, and concentration of metals. However, current commercial extractants encounter some difficulties when cobalt and nickel are extracted from solutions containing a large amount of impurities such as manganese and calcium. There is an urgent need to develop new reagents for the selective extraction of Ni and Co. In this study, N-(2-ethylhexyl)-pyridine-4-carboxamide (NEHPCA) was synthesized, and the metal extraction capacity of its synergistic solvent extraction (SSX) system with dinonylnaphthalene sulfonic acid (DNNSA) and tributyl phosphate (TBP) modifier was examined. The experimental results show that the selectivity of the new SSX system has the order Cu > Ni > Co > Zn > Mn > Ca > Al ≈ Cr (III) ≈ Mg ≈ Fe (III), with excellent selectivity for nickel and cobalt. Using an organic phase composed of 0.7 M NEHPCA, 0.35 M DNNSA, and 0.2 M TBP under 1:1O/A operation, after three-stage theoretical extraction, more than 99% of nickel and cobalt can be recovered from a synthetic leaching solution of nickel laterite ore. Mechanistic studies showed that NEHPCA and water molecules participate in the internal coordination of metals, and DNNSA provided coordination anions to achieve charge balance, forming the Ni complex in this SSX system which existed most likely in the form of [Ni(NEHPCA) 2 (H 2 O) 4 ](DNNS) 2 in the organic phase.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 2
·522-531
·
IF 2.047
Zheng Jie,Chen Jiali,Tang Yu,Shen Kaiyuan,Xiang Yujie,Shen Lanxian,Ge Wen,Yang Peizhi,Deng Shukang
In this study, β -Zn 4 Sb 3 was prepared using the Zn-NaCl mixed-flux method based on the stoichiometric ratio of Zn/Sb/NaCl = (4− x ):3:(7+ x ) ( x = 0, 0.1, 0.2, 0.3). X-ray diffraction results showed that all samples were hexagonal rhombic crystal structures with the space group \(R\overline{3}c\) . A second phase of ZnSb was detected in the samples with x = 0.2 and x = 0.3. In addition, the crystal-cell volume and lattice parameter of all samples increased for the larger ion radius of Na + than Zn 2+ . The transmission electron microscopy image and corresponding area electron diffraction pattern demonstrated that the prepared samples had a complete crystal structure. All samples had hole conduction and exhibited p-type conduction behavior. The carrier concentration of the material increased with increased Na content and decreased Zn, ranging from 8.89 × 10 19 cm −3 to 17.82 × 10 19 cm −3 . Moreover, the thermal conductivity ( κ ) of x = 0–0.2 samples decreased with increased Na content; however, the sample with x = 0.3 had a higher κ owing to the appearance of a ZnSb phase. Thermogravimetric differential thermal analysis showed that no weight loss occurred below the melting point. Eventually, the sample with the nominal composition of β- Zn 3.8 Sb 3 NaCl 7.2 achieved a ZT value of 1.43 at 690 K.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yan Zheng,Chenchen Dong,Ying Li,Wansu Peng,Yukun Li,Yong Wang,Xiaoliang Wang,Chao Teng,Dongshan Zhou,Gi Xue
Low-power or self-powered electronic skin (e-skin) is considered an important research area, as it reduces the requirements for stable energy sources in electronic systems. However, most reported self-powered e-skins can only detect dynamic mechanical stimuli, but cannot detect ubiquitous static mechanical stimuli, resulting in a significant amount of information loss. In this paper, we report a self-powered e-skin based on electrode potential difference that can detect dynamic/static mechanical stimuli with sensitivity and response time of 399 mV/kPa and 85 ms, respectively. In this device, the mechanical stimulus is converted into a voltage signal by regulating the impedance of the electrode/electrolyte interface. In the process of preparing the device, a “green” electrode ink was prepared using a water-soluble, biodegradable polymer as the binder of the active material. Owing to the printability of the ink, a patterned electrode can be formed on a flexible substrate using low-cost screen-printing technology . Finally, we designed a co-planar shared electrode structure, which effectively reduced the complexity of the circuit layout. This new device has been successfully used for information acquisition of objects and detection of physiological signals, and we believe it has significant implications for the future development of e-skins.
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Journal of Energy Storage
·
2023
·
IF 9.4
Fengzhao Hua,Yunqiang Zhang,Shilei Cao,Mei Li,Laiying Jing,Jiaxi Cui
Conductive polyaniline (PANI) is considered as a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its reversible redox properties. In this study, we prepared a binder-free PANI ( β PG-PANI-6) cathode co-doped with β -naphthalene sulfonic acid ( β -NSA), HClO 4 , and graphitic acid (GA) via a layer-by-layer self-assembled electro-polymerization method. As a soft template, β -NSA micelles can be doped with HClO 4 into PANI nanoparticles to prevent the tight accumulation of PANI chains. Moreover, β -NSA and GA adsorbed on the surface of PANI nanoparticles through layer-by-layer self-assembly contain abundant weak acid groups, which can act as internal proton reservoirs to offer protons to guarantee high redox activity. During the electro-polymerization process, the flexible GA matrix which forms N O bond closely with PANI can alleviate the volume expansion effect of PANI. As a result, the β PG-PANI-6 cathode can obtain superior discharge specific capacity (560.5 mAh/g, 0.2 A/g), excellent rate performance (251.3 mAh/g, 10 A/g). It is commendable that the AZIBs assembled by β PG-PANI-6 cathode deliver ultra-high energy density and power density (535.31 Wh/kg @ 187.16 W/kg, 184.45 Wh/kg @ 7378.01 W/kg). This study expands the doping chemistry of PANI and advances the development of conducting polymer for AZIBs to a new level.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Shuai Zhao,Tuoyu Zhou,Aman Khan,Zhengjun Chen,Pu Liu,Xiangkai Li
Electrochemical enzyme biosensors based on various modified electrodes have been developed for bisphenol A detection. However, enzyme activity loss and high cost limit their application. In this study, an electrochemical biosensor was developed for bisphenol A detection by displaying tyrosinase on the surface of Escherichia coli cells, followed by adsorption onto a glassy-carbon electrode. The biosensor exhibited a linear relationship between the concentration range of 0.01–100 nM BPA (R 2 = 0.9967) and the current peak. The detection limit was 0.01 nM, which is higher than that of other chemically modified tyrosinase biosensors. For the detection of bisphenol A in tea and juice samples, the fabricated biosensor presented respectable accuracy comparable to that of high-performance liquid chromatography. Furthermore, high recovery rates (97.78%−100.32%) were obtained. Therefore, this biosensor could be a promising and reliable analytical tool for the detection of bisphenol A.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Huijuan Bai,Jin Zhang,Haining Wang,Yan Xiang,Shanfu Lu
Poly(vinyl pyrrolidone) (PVP)-based high-temperature polymer electrolyte membranes (HT-PEMs) doped with phosphoric acid (PA) present an attractive prospect for high-temperature fuel cell. However, its proton conductivities and mechanical properties are inversely dependent on PVP content in membranes. Herein, chloromethyl-polysulfone is used as a polymeric crosslinker to fabricate cross-linked PVP. The effects of chloromethylation degree of polysulfone on PVP cross-linking degree, free volume and other parameters are studied. The quaternary amine groups introduced by cross-linking reaction enhances PA adsorption and retention capacity of membrane. The increased molar free volume created by polymeric crosslinker can accommodate more PA storage and reduce the polymer main chain plasticization. Thus, the mechanical properties of membranes are maintained. When compared to uncross-linked C-PVP-0/PA, the cross-linked C-PVP-13.7%/PA exhibits improved mechanical strength with increasement of 140% (4.5 MPa) and enhanced proton conductivity with increasement of 119% (120.0 mS cm −1 @160 °C). Also, these superior characteristics allow a significantly enhanced H 2 –O 2 fuel cell performance with the membrane of 724.9 mW cm −2 @160 °C, which has increasement of 50% in comparison with that of the C-PVP-0%/PA membrane, and excellent durability. These praiseworthy results suggest that the cross-linked membrane within moderately molar free volume is potential to act as HT-PEMs materials for real-world applications.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yanju Chen,Hui Wu,Siwenjie Qian,Xiaoping Yu,Huan Chen,Jian Wu
Heavy metal lead accumulation in the environment pollutes the ecology systems and further threatens the human health. It is necessary to develop a sensitive method to detect it. Here, we propose a highly sensitive lead detection method by combining DNAzyme and CRISPR system. Once the lead ion is recognized, the substrate chain of DNAzyme is cleaved to produce single strand DNA . The produced single strand DNA can be detected by Cas protein/guide RNA complex and further trigger the collateral cleavage effect of CRISPR system, which can indiscriminately cut short single strand DNA reporters. By this way, the detection signals can be greatly amplified. This method can detect lead ions as low as 0.48 nM. The sensitivity is higher than the DNAzyme method. Furthermore, the portable 3D printing device is designed to observe the fluorescent signals so the end-point detection results can be visualized by the naked eyes. The entire detection process can avoid using bulky and expensive instruments, which can promote on-site lead ion detection.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuan Li,Wenyao Qian,Yong Xia,Xinxin Li,Dongmei Li,Zhiqiang Guo
Noble metal nanostructures with localized surface plasmon resonance (LSPR) effect can be employed to enhance the light absorption ability of photocatalysts . However, it has been a challenge to control the size and morphology of noble metal nanostructures to manipulate the LSPR wavelength and improve the performance of photocatalysts. Herein, an Ag dendrite (AgD) composed of Ag nanorods with different sizes was facilely constructed by a displacement reaction, and sunlight-driven LSPR-enhanced core-shell AgD/g-C 3 N 4 composite photocatalysts (AgD-CN) were synthesized by thermal polymerizing mixtures of melamine and different amounts of AgD. This core-shell AgD-CN improved the stability of AgD and made full use of the near-field enhancement effect of AgD’s LSPR, resulting in a broad light absorption band. AgD-CN-15 showed the highest photogenerated electron-hole pair separation rate and the best photocatalytic performance when the addition amount of AgD was 3 wt%. The degradation rate of RhB by AgD-CN-15 reached 95.20% after sunlight irradiation for 60 min, and its reaction rate constant was 5.2 times that of the pristine g-C 3 N 4 . Moreover, ·OH, h + and ·O 2 - were found to be the main active species. AgD is easy to prepare and can broaden the light absorption wavelength range and significantly enhance light absorption ability of photocatalysts, which provides a new method to improve the performance of LSPR-enhanced photocatalysts.
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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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PubMed
高影响因子
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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