ELECTROCHIMICA ACTA
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2023
·
IF 6.6
Chunyan Fan,Zehao Zang,Xiang Li,Junfang Zhang,Ping Yang,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Transition metal hydroxides have superior oxygen evolution reaction (OER) activity but poor hydrogen evolution reaction (HER) performance, which greatly limits the water splitting for hydrogen production. Herein, copper modification of sulfur doped Co(OH) 2 hybrid catalyst (Cu@S-Co(OH) 2 ) was prepared by one-step of electrodeposition method which can serve as efficient hydrogen evolution reaction catalyst. In the presence of sulfur and copper, Cu@S-Co(OH) 2 hybrid catalyst exhibits the best catalytic activity, showing ultralow overpotential of 42 mV at a current density of 10 mA cm −2 . Compared with Co(OH) 2 , the overpotential is improved by nearly 100 mV as well as enhanced stability. In addition, the active site poison experiments proved that the active center is cobalt metal. Combined with the adsorption strength of the catalyst for OH and H species, it is considered that both S and Cu can enhance the adsorption of OH for Co(OH) 2 , while S is contributed to the adsorption of H, and Cu can promote the desorption of H. This work provides a facile method and new insight to enhance the HER activity for transitional metal hydroxides via metal and non-metallic elements co-modulation.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 11
·4990-5002
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IF 5.3
Wang Guoqiang,Hao Xingyu,Dong Yakun,Zhang Li
Bio-based poly(butylene succinate-co-dodecylene succinate) (PBDSs) were successfully synthesized by adjusting the content of 1,12-dodecanediol (DD) using melt polycondensation method. The chemical structure, thermal behavior, crystallization properties, mechanical properties, and rheological properties were characterized. FTIR, 1 H NMR, and 13 C NMR showed the successful synthesis of polymers with the expected structure. The synthesized polymers have high number-average molecular weight (32500–64200 g/mol). The copolyesters were random copolymers. The relationship between melting temperatures and composition was basically V-shaped distribution, which is a typical characteristic of isodimorphism behavior. Thermogravimetric analysis (TGA) showed that the thermal stability of the synthesized copolyesters was good, with no significant weight loss until 320 °C. The synthesized polymers were all semi-crystalline polymers. When the amount of dodecylene succinate unit in the product is 80%, the copolyester has good mechanical properties (tensile strength: 34.5 MPa, elongation at break: 3489%) and processing properties, so it may be more suitable for making films.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Kai Feng,Luxin Yang,Liang Chen,Qi Jing,Huan Li,Debin Li,Jiayi Liu,Jiabai Cai,Zhou Deng
Although many technologies can be applied to sewage sludge (SS) and food waste (FW) treatment, high investment and operational costs, high land occupation, and the “not-in-my-backyard” effect pose many challenges in practice. Thus, it is important to develop and utilize low-carbon or negative-carbon technologies to tackle the carbon problem. This paper proposes a method of anaerobic co-digestion of FW and SS, thermally hydrolyzed sludge (THS), or THS filtrate (THF) to enhance their methane potential. Compared to the co-digestion of SS with FW, the methane yield of the co-digestion of THS and FW was 9.7–69.7% higher, and that of the co-digestion of THF and FW was 11.1–101.1% higher. The synergistic effect was weakened with the addition of THS but enhanced with the addition of THF, potentially owing to the change in humic substances . Filtration removed most humic acids (HAs) from THS but retained fulvic acids (FAs) in THF. Moreover, THF produced 71.4% of the methane yield of THS, although only 25% of the organic matter permeated from THS to THF. This indicated that hardly biodegradable substances remained in the dewatering cake and were removed from anaerobic digestion systems. The results indicate that the co-digestion of THF and FW is an effective way to enhance methane production.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Miao Wang,Shuai Zhang,Xiangjun Liu,Yayun Ma,Junqi Wang
A comprehensive study of alkali and alkaline earth metal (AAEM) salts including two different anions (Cl - and CH 3 COO - ) in the catalytic pyrolysis of cellulose to produce levoglucosan (LG), bio-oil, and biochar were investigated. At the same time, the catalytic pyrolysis mechanism was also speculated. The thermogravimetric analyzer (TGA) and lab-scale fixed-bed reactor system were used to determine the thermal degradation process and the pyrolysis products of LG, bio-oil, and biochar. The optimized pyrolysis parameters were obtained by using Box-Behnken design-response surface method. According to the results, AAEM salts significantly boosted the yield of biochar, as well as greatly cut down the output of LG and bio-oil. The rank of effect on LG yield was as follows: CaCl 2 , MgCl 2 > CH 3 COOK, CH 3 COONa > (CH 3 COO) 2 Mg, (CH 3 COO) 2 Ca > KCl, NaCl. Moreover, the addition of AAEM salts considerably dropped the activation energy E of cellulose pyrolysis as well as prompted microcrystalline cellulose pyrolysis under lower temperatures. This study was pivotal in deducing the pathway of cellulose pyrolysis, thereby offering critical insights to hasten the progress of biomass utilization.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 26
·12101-12108
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IF 3.3
Bin Li,Wenrui Hao,Jizhen Liu,Mengjing Zhou,Xiaojia Xu,Aolin Wu
Deep eutectic solvent (DES) was synthesized from choline chloride (ChCl) and acrylamide (AM), and P(AM-co-MA) hydrogels were prepared by adding different contents of maleic acid (MA) to DES by frontal polymerization. Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the hydrogels at the microscopic level, and the swelling properties, mechanical properties, self-healing properties and electrical properties of the copolymerized hydrogels were also investigated. The results showed that the equilibrium swelling of the hydrogels was significantly enhanced with the increase of pH due to the addition of MA. The hydrogel with the addition of MA has self-healing properties that pure PAM does not have. In terms of electrical conductivity, the increase of MA makes the internal structure of the hydrogel more loose, which is conducive to the passage of free ions. And there is a significant effect of different temperatures and different crosslinker contents on the electrical conductivity. In summary, we prepared a P(AM-co-MA) hydrogel that can produce significant property changes in response to changes in the external environment, which is expected to expand the application of hydrogels in flexible electronic materials.
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POLYMER BULLETIN
·
2023
·
IF 3.2
Mei Li,Lixian Zhou,Jialin Yu,Zihan Zhu,Jiaqi Lin,Yufu Li,Kancheng Mai
To enhance antimicrobial resistance of ZnO-based polymer materials, ZnO supported diatomite (DZ) was prepared and characterized by SEM, XPS, BET and inhibition zone method. The antimicrobial resistance, thermal decomposition, crystallization characteristics and mechanical properties of DZ and nano-ZnO filled polylactic acid (PLA)/poly(butylene adipate- co -terephthalate) [PBAT] composites were compared by tablet counting method, thermogravimetric analysis, differential scanning calorimetry and mechanical testing. The antimicrobial resistance of DZ filled PLA/PBAT composites was higher that of nano-ZnO filled PLA/PBAT composites, indicating higher antimicrobial resistance of DZ than that of nano-ZnO. The thermal decomposition temperature of DZ filled PLA/PBAT composites was much stable than that of nano-ZnO filled PLA/PBAT composites. Meanwhile, crystallization properties of DZ filled PLA/PBAT composites had little effect. But the nano-ZnO distinctly decreased the mechanical properties of PLA/PBAT composites. Loading on diatomite with ZnO can effectively improve the antibacterial properties and thermal stability of ZnO filled PLA/PBAT composites.
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Nanomaterials
·
2023
·Vol. 13
·期 7
·1188
·
IF 5.3
Lina Sun,Liping Sun,Lihua Huo,Hui Zhao
H2O2generation via an electrochemical two-electron oxygen reduction (2e−ORR) is a potential candidate to replace the industrial anthraquinone process. In this study, porous carbon catalysts co-doped by nitrogen and oxygen are successfully synthesized by the pyrolysis and oxidation of a ZIF-67 precursor. The catalyst exhibits a selectivity of ~83.1% for 2e−ORR, with the electron-transferring number approaching 2.33, and generation rate of 2909.79 mmol g−1h−1at 0.36 V (vs. RHE) in KOH solution (0.1 M). The results prove that graphitic N and –COOH functional groups act as the catalytic centers for this reaction, and the two functional groups work together to greatly enhance the performance of 2e−ORR. In addition, the introduction of the –COOH functional group increases the hydrophilicity and the zeta potential of the carbon materials, which also promotes the 2e−ORR. The study provides a new understanding of the production of H2O2by electrocatalytic oxygen reduction with MOF-derived carbon catalysts.Keywords:porous carbon;two-electron reduction of oxygen;hydrogen peroxide;electrocatalyst
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Huixian Zhou,Yiqing Zeng,Zexian Low,Feng Zhang,Zhaoxiang Zhong,Weihong Xing
Developing cost-effective and high-efficient air purification materials for enhancing the indoor air quality has been an ongoing concern. Herein, MnO 2 /Co–C catalyst layers were wrapped on SiO 2 nanofiber by a combination of thermal pyrolysis and redox reaction method to prepare catalytic membranes (MCCS-x) for the efficient purification of indoor PM and HCHO. The core-dual-shell structure maintains the pore structure of the membrane, providing high gas permeability of 670 m 3 ·m −2 ·h −1 ·kPa −1 . Owing to the introduction of MnO 2 /Co–C enhanced the capture of PM, the optimized MCCS-2 exhibits high filtration efficiency of PM 0.3 and PM 2.5 (99.60% and 99.99%) with a low pressure drop (<80 Pa). In addition, MCCS-2 achieves 100% HCHO removal efficiency at room temperature due to its large specific surface area, high redox property and abundant Mn 4+ and oxygen species. The appropriate proportion of Mn/Co bimetallic sites synergy inhibits the formation of formate and carbonate intermediate species, thus MCCS-2 possesses excellent long-term catalytic stability than contrast sample (MCCS-3 and MS). This work demonstrates a new approach for the fabrication of high-performance catalytic membrane materials for indoor air purification.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhoujie Liang,Yu Zhang,Guojie Zhang,Jun Liu,Yajing Cai,Ying Wang,Yuqiong Zhao,Guoqiang Li,Kunlun Bei
In this paper, a series of cobalt catalysts modified by different lanthanide metals were synthesized via co-impregnation method using inexpensive industrial-grade alumina as a support for dry reforming of methane. The effect of lanthanide metals as accelerators of cobalt-based catalysts on catalytic performance and anti-coking properties was mainly investigated. The textural relationships between the catalytic performance and physicochemical properties of cobalt-based catalysts doped with different lanthanide metals were further investigated. Different characterization techniques demonstrate the positive effect of lanthanide metals on the physicochemical properties of catalysts. The results show that the electron transfer between cobalt species and lanthanide metal oxides is significantly enhanced due to the introduction of lanthanide elements. The process generates more active sites, which is favorable for the adsorption and activation of methane. In addition, the abundant medium basic sites and oxygen vacancies on the surface of cobalt-based catalysts with the effect of lanthanides promoted the adsorption and activation of carbon dioxide and the gasification of carbon accumulation, which greatly improved the anti-carbon accumulation performance of the catalysts. Therefore, the prepared cobalt-lanthanum-based catalysts showed the best catalytic effect and have great potential for application.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tianyou Chen,Jin Hu,Kaizhao Wang,Kaijun Wang,Weijun Zhang,Haijiao Xie,Guoyou Gan,Jin Shi
Electron transfer to CO 2 is commonly regarded as a critical step for activating CO 2 . Herein, we describe the development of a simple and effective strategy to facilitate electron transfer to CO 2 by introducing oxygen vacancies (O V ) in electrocatalysts. We discovered that stirring oxidized eutectic gallium indium is an important pretreatment step for introducing O V . In the subsequent CO 2 reduction process, the oxidized eutectic gallium indium (O-EGaIn) was reduced to the oxide-derived EGaIn (OD-EGaIn), which achieved 4 times higher Faradic efficiency for CO production than the eutectic gallium indium (EGaIn) in a tetrabutylammonium chloride/acetonitrile (Bu 4 NCl/AN) electrolytes. The XPS results showed that the O V concentration in the OD-EGaIn is much larger than that in the O-EGaIn and EGaIn samples. Electrokinetic studies indicated that the introduction of O V facilitates electron transfer to CO 2 . Density functional theory (DFT) calculations further revealed that the electrons tend to accumulate around the O V . These localized electrons then flow to the antibonding orbitals of CO 2 molecules, resulting in activating CO 2 and forming the key CO 2 •− radical.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1247-1255
·
IF 3.925
Kun-Lang Lu,Xian-Yong Wei,Fa-Zhan Mao,Zhi-Juan Zhu,Zhuang Li,Fan Yin,Jia-Hao Li,Zhi-Min Zong
Nitrogen and sulfur co-doped porous carbon (NSCDPC) was prepared using a one-step method using a purple-leaf plum kernel shell, potassium benzoate, and N,N′-diphenylthiourea (DPTU) as the carbon precursor, the activator and the nitrogen and sulfur source, respectively. The use of potassium benzoate with weak alkalinity and causticity facilitates obtaining abundant microporous structures and heteroatoms. Meanwhile, the dopant N,N′-diphenylthiourea plays a synergic activation role. The optimal layer-stacked NSCDPC750-1 exhibits abundant ultramicropores and defect sites, developed interconnected channels, a large specific surface area, and rich nitrogen and sulfur contents, resulting in excellent electrochemical performance. As expected, NSCDPC750-1 exhibits a high specific capacitance of 338 F g−1 at 0.5 A g−1 in 6 M KOH electrolyte, an outstanding rate performance with 280 F g−1 at 20 A g−1, and remarkable durability with 92.3% retention after 10 000 cycles. In addition, a symmetric supercapacitor assembled with NSCDPC750-1 as the electrode and 6 M KOH as the electrolyte possesses an outstanding specific capacitance of 111 F g−1 at 0.5 A g−1, an excellent rate capability, and a high energy density of 30.22 W h kg−1. The impressive electrochemical performance makes NSCDPC750-1 a promising supercapacitor electrode material.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zhiyong Zhu,Guanyao Yu,Liangjing Duan,Xiao Liu,Li Wang,Jinglai Zhang
Developing a robust catalyst for CO 2 reduction reaction (CO 2 RR) is critical to achieving a closed carbon cycle. Yet, the process of CO 2 RR still faces enormous challenges, in part because of the lack of highly active, stable, as well as cost-effective electrocatalysts. In this work, we reported an effective and sample strategy to immobilize nickel phthalocyanine (Ni-Pc) molecules on the fruit-peel-derived carbon framework surface (denoted as Ni-Pc/CF and carbon framework denoted as CF) with exceptional CO production performances. Dispersed Ni-Pc molecules on the carbon materials are verified by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman measurements. The obtained Ni-Pc/CF catalyst shows that the high faradaic efficiency (FE) exceeds 95.0 % over a potential of −0.7 to −0.9 V ( vs reversible hydrogen electrode (RHE), V RHE ), the maximum FE (99.1 %) can close to 100 % at −0.8 V, and the excellent stability over a 10 h reaction period. This work offers valuable insights into the immobilization of stabilized, highly dispersed molecule catalysts on carbon materials surfaces for selective reduction of CO 2 to CO.
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