ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hua Tian,Kaixin Zhu,Wang Li,Lin Wang,Zhifeng Yu,Yuannan Lai,Yunyi He
Ni-Co layered double hydroxide (NCLDH) with nitrate anions as interlayer counter ions was obtained via an oxidation-induced anion intercalation process. The optimization on the tunable proportion between divalent and trivalent metal cations in NCLDH host layers is realized in the dependence on the regulation of the additive amount of hydrogen peroxide as an oxidizing agent. The increase of trivalent metal cations facilitates the intercalation of nitrate anions into the interlamellar region between NCLDH host layers. Importantly, the electrostatic interaction between NCLDH host layers and interlayer anions results in the formation of hierarchical flower-like morphologies towards the enhancement of specific surface areas. Moreover, the increase in number of interlayer nitrate anions expands effectively interplanar spacing between NCLDH host layers. Remarkably, this unique structure not only accelerates the diffusion process of active hydroxide anions in the bulk phase of LDH, but also strengthens the stability of the hierarchical structure during electrochemical reactions. The electrochemical evaluation shows that NCLDH-16 achieves a superior specific capacity of 802 C g −1 at a current density of 1 A g −1 with a capacity retention of 86.7% as the increase of current densities to 10 A g −1 . The NCLDH-16//AC hybrid supercapacitor delivers a maximum energy density of 37.6 Wh kg −1 at a power density of 800 W kg −1 as well as still retains 87.4% of the initial capacitance after 10 000 cycles, suggesting great potential in practical energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
电化学能量存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Cheng Li,Guangyu Li,Yongtao Zhan,Chenzhao Liu,Yujie Tang,Dong Yan,Jian Li,Lichao Jia
A strategy of in-stack dry reforming of methane (DRM) is proposed by using La 0.6 Sr 0.2 Cr 0.85 Ni 0.15 O 3-δ -loaded Ni foam (LSCrN@NF) as a CH 4 –CO 2 reformer, fuel gas distributor, and anode current collector in a SOFC stack. The prepared LSCrN exists as a single phase in a perovskite structure ; its reduced form contains exsolved Ni nanoparticles embedded on the surface of the LSCrN substrate. Introduced into an NF, the reduced LSCrN@NF demonstrates high DRM activity that increases with the increase of LSCrN amount to an optimum of about 42%. With the LSCrN@NF in-stack DRM, the conversions of CH 4 and CO 2 into CO and H 2 increase. Thus, the electrode polarization resistance, including the cathode and anode , decreases to 0.62, 1.07, and 3.93 Ω cm 2 at 800 °C, 750 °C, and 700 °C, respectively. Consequently, the peak power density (PPD) of the cell using 45% CH 4 -45% CO 2 –10% N 2 as fuel is 1.17, 0.94, and 0.47 W cm −2 , significantly higher than that of the cell without LSCrN@NF in-stack DRM. In addition, the voltage of the cell with LSCrN@NF in-stack DRM is stable on a level between 0.81 and 0.82 V at 400 mA cm −2 and 750 °C for 270 h without detected carbon deposition in the Ni–Y 2 O 3 stabilized ZrO 2 anode. This LSCrN@NF in-stack DRM strategy is also adopted with a large-scale (13 × 13 cm 2 ) single cell, which shows an extrapolated PPD of 428.3 mW cm −2 at 750 °C and is operated for 40 h at 400 mA cm −2 without noticeable performance degradation .
研究领域:
能源材料
·
电化学工程
·
催化化学
·
燃料电池技术
·
高温材料科学
·
化学反应工程
·
清洁能源转化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xingxing Li,Yan Zhu,Nan Zhang,Yansheng Gong,Rui Wang,Huanwen Wang,Jun Jin,Ling Zhao,Beibei He
The development of symmetrical solid oxide fuel cells (SSOFCs) faces a significant challenge in designing electrode materials that exhibit both high activity and stability. In this work, a novel layered perovskite oxide symmetric electrode material PrBaFe 1.8 Hf 0.2 O 5+δ (PBFH) for SSOFCs is proposed and synthesized. Doping Hf at the B-site of PrBaFe 2 O 5+δ (PBF) improves the stability in reducing atmosphere and increases the concentration of oxygen vacancies . Furthermore, a small amount of RuO x is deposited by atomic layer deposition (ALD) onto PrBaFe 1.8 Hf 0.2 O 5+δ scaffold as symmetric electrodes. The surface modification of ALD-RuO x significantly boosts the catalytic activity for both fuel oxidation and oxygen reduction, simultaneously. Compared to PBF electrodes, the interfacial polarization resistances of RuO x -PBFH decrease to 0.77 Ω cm 2 under H 2 /Ar and 0.021 Ω cm 2 under air atmosphere at 800 °C, respectively. At 800 °C, SSOFCs equipped with RuO x -PBFH symmetric electrodes exhibit a high peak power density of 0.85 W cm −2 and 0.41 W cm −2 using humidified hydrogen and propane as fuels, respectively. Moreover, the RuO x -PBFH electrode demonstrates long-lasting performance, displaying high resistance against coking. These findings reveal a facile ALD approach for tailoring symmetric perovskite electrodes, offering robust and efficient electrocatalysis with efficient noble metal utilization.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体离子学
·
催化化学
·
功能陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Jingwei Gu,Ying Zeng,Xiaofang Feng,Ximin Wu,Chunmei Zeng,Mingqi Li
Nanosilicon@nonstoichiometric silicon oxide where nanosilicon is embedded in SiO x matrix (abbreviated as nano-Si@SiOx), is a very attractive material structure to suppress the volume effect of silicon in Lithium-ion batteries. In this work, we demonstrate that the combination of electrolysis and peeling technique produce nano-Si@SiOx from bulk SiO 2 . X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM) are employed to characterize the prepared materials. The average O/Si atomic ratio of the synthesized nano-Si@SiOx is about 0.91. The nano-Si@SiOx/graphite composite prepared using it as the precursor exhibits a stable discharge capacity of about 1560 mAh g −1 (calculated on the total mass of the composite) with good cyclic stability and rate capability. This work provides a new routine to prepare nano-Si@SiOx composite.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
锂离子电池
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2017
·
IF 4.529
Zhenna Zhang,Juan Wang,Xueying Zhang,Qingli Shi,Le Xin,Hongfei Fu,Yunyang Wang
This paper is focused on the effects of radio frequency (RF) heating on the relative activity of polyphenol oxidase (PPO), weight loss, texture, color, and microstructure of potatoes. The results showed that pure mushroom PPO was almost completely inactivated at 80 °C by RF heating. The relative activity of potato PPO reduced to less than 10% with increasing temperature (25–85 °C). Enzyme extract showed the lowest PPO relative activity at 85 °C after RF treatment, followed by the potato cuboids and mashed potato, about 0.19 ± 0.017%, 3.24 ± 0.19%, and 3.54 ± 0.04%, respectively. Circular dichroism analysis indicated that RF heating changed the secondary structure of PPO, as α-helix content decreased. Both electrode gap and temperature had significant effect ( P < .05) on weight loss, color, and texture of the potato cuboids. Microstructure analysis showed the changes of potato cell and starch during RF heating.
研究领域:
食品科学
·
食品工程
·
生物物理学
·
酶学
·
农产品加工
✓ 已验证
DOI
高影响因子
Food & Function
·
2019
·Vol. 10
·期 2
·625-634
·
IF 3.241
Jieyu Wu,Rongfa Guan,Haizhi Huang,Zhenfeng Liu,Haitao Shen,Qile Xia
The instability of catechins (CT) is currently a challenge for their application in the food industry. This study explored whether or not the protective effects of liposome encapsulation on CT could enhance the role of CT as antioxidants in reducing nitrosamines (NAs) in traditional Chinese bacon (TCB). The samples were further characterized by the analysis of volatile compounds, color parameters, and texture profile during storage to assess the effects of catechin liposomes (CTL) on TCB. Results showed that the increase in NAs in fried TCB was strongly dependent on the storage time. CTL could reduce the production of NAs in fried TCB (40.45%) more strongly than CT (15.13%) after 49 days of storage. Higher phenol contents were found in CTL (1515.25 × 106 area unit (AU)) than those in control (1451.73 × 106 AU) and CT (1391.10 × 106 AU) TCB at the end of storage. The addition of antioxidants increased (p < 0.05) a* values in the following order: CTL > CT > control with mean values of 6.54, 5.09, and 3.92, respectively, after 49-day storage. Conversely, the addition of CTL decreased (p < 0.05) the hardness of TCB. Encapsulating CT in the liposomes can effectively reduce the NAs in TCB and positively affect its quality. This technique may guide the potential application of liposomes in the meat industry.
研究领域:
食品科学
·
生物学
·
营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Lina Wang,Peiyi Yan,Huairui Chen,Zhuo Li,Shu Jin,Xiaoxiang Xu,Jun Qian
Narrow bandgap semiconductor MgIn 2 S 4 has been readily grown onto In 2 O 3 nanofibers by an in situ growing method. The so-formed MgIn 2 S 4 -In 2 O 3 hybrid nanofibers are characterized by strong visible light absorption and intimate MgIn 2 S 4 /In 2 O 3 heterointerfaces. Under visible light illumination ( λ ≥ 400 nm), the hybrid nanofibers demonstrate an exceptionally high photocatalytic activity for Escherichia coli ( E. coli ) disinfection, outcompeting pristine MgIn 2 S 4 , naked In 2 O 3 nanofibers, and many other photocatalytic systems reported. Specifically, the hybrid nanofibers achieve a 7 log reduction in viable cells for merely 20 min illumination while pristine MgIn 2 S 4 and naked In 2 O 3 nanofibers alone are almost inactive. Further analysis indicates that the hybrid nanofibers essentially form a type-II semiconductor heterojunctions which enable spatial separation of photocarriers. Owing to the intimate heterointerfaces, photocarriers can be promptly separated and accumulated respectively in In 2 O 3 and MgIn 2 S 4 thereby allowing continuous generation of copious reactive species for disinfection. This work signifies the usefulness of heterointerfaces in promoting photocarrier separation and provides a useful strategy to upgrade photocatalytic performance from otherwise almost inactive semiconductors.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 3
·2528-2538
·
IF 1.5
Wenhui Geng,Mengmeng Zheng,Dan Chen,Xianwen Wang,Zekai Zhang,Yishan Lin,Dongqin Cai,Huiqin Li,Guobo Huang,Yanxian Jin Yu,Binbin Yus
Palladium catalyst (Pd) are made attention to application in alcohol fuel cells due to unique performance, as well as the resource abundance and low cost, but the catalyst performance and stability of the catalysts are still not satisfied. In this article, the novel PdFe/B-N-G catalysts with the double element alloying and dual-doping for ethanol electro-oxidation are successfully prepared and determined by XRD, TEM and XPS. TEM results reveal a relatively uniform and high dispersion of Pd particles is observed on PdFe/B-N-G catalyst. The XPS analysis indicates that Pd(0) contents of the PdFe/B-N-G catalyst are increased on account of the B, N-doping effect. Being explored as the catalyst to the ethanol oxidation reactions, the PdFe/B-N-G catalysts exhibit the better electrocatalytic activity with higher current densities and catalyst stability compared to those of PdFe/G and Pd/B-N-G, which can be attributed to the synergistic effect of the enhanced PdFe alloying and the B, N-doping, that can produce more activity sites dispersing on the surface of graphene. Thus, the novel PdFe/B-N-G catalysts can be the potential alternate in alcohol fuel cells.
研究领域:
电化学
·
纳米催化
·
能源材料
·
燃料电池
·
表面科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·Vol. 57
·期 59
·28947-28956
·
IF 1
Qiao Wang,Guang-shan Zhang,Han Chen,Peng Wang
A specially designed combined process of pre-oxidation and nanofiltration membrane was utilized to remove As(III) in the contaminated water without reagent addition and sediment creation in this work. Different parameters that affected the rejections of As(III) and As(V) were discussed, including the initial concentration, pH of the feed, and the cross-flow filtration pressure. The rejection of As(III) was over 70% which was restricted to the high initial feed concentration, while it was around 40% under the other conditions. Whereas, the rejection of As(V) maintained above 95% in all tests. As a result, As(III) was first pre-oxidized before membrane filtration. The ozone and aeration oxidation methods were used to oxidize As(III). The effects of aeration time and oxidation time were studied. The experimental results indicated that the rejection of As(III) was increased to over 90% after pre-oxidation, and the permeate could meet the drinking water standard for As in China. Particularly, the aeration took a much longer oxidation time than ozone, but it was still a more suitable method as the pre-oxidation process because of its safety and easy operability.
研究领域:
环境工程
·
水处理技术
·
膜分离
·
污染物控制
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2016
·Vol. 127
·期 3
·1889-1895
·
IF 1.781
Yuan Kangkang,Gan Xinzhu,Wang Xinqiang,Zhu Luyi,Zhang Guanghui,Xu Dong
The present study fully reports the decomposition of polyacetylacetonatozirconium (PAZ) in air with thermogravimetry–differential scanning calorimetry and Fourier transform infrared spectroscopy. The influence of water vapor on the decomposition of PAZ was characterized with the Fourier transform infrared spectroscopy. Crystallization and phase transformation of PAZ were studied by X-ray diffraction and Raman spectroscopy. The experimental results show that water vapor promotes the decomposition of PAZ and crystallization of zirconia compared with air. Furthermore, the effect of different amount of stabilizer Y(NO 3 ) 3 ·6H 2 O on the pyrolysis and phase stabilization of PAZ shows that NO 3
− was beneficial to the oxidation of organic components and the formation of Y 2 O 3 could stabilize tetragonal zirconia and hinder grain growth.
研究领域:
材料化学
·
无机化学
·
纳米材料
·
热分析
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Guoli Chen,Kun Song,Xiaoming Huang,Wenbo Wang
Titanium dioxide (TiO 2 ) colloid was synthesized by using tetrabutyl titanate . TiO 2 (KH-570) intermediate was prepared by etherification reaction of TiO 2 colloid and KH-570. The CS-GMA intermediate was prepared by ring-opening reaction of chitosan (CS) and glycidyl methacrylate (GMA). Finally, copolymerization two intermediates obtain a new adsorbent, TiO 2 (KH-570)-g-(CS-GMA). The results manifest that the maximum adsorption amounts of toluene and Pb(II) are 56.62 mg/g and 623.56 mg/g, respectively. The adsorption of TiO 2 (KH-570)-g-(CS-GMA) adsorbent for toluene and Pb(II) accord with the pseudo-second-order kinetics mechanism and Langmuir equation, indicate that the TiO 2 (KH-570)-g-(CS-GMA) adsorbent has better adsorption effect on toluene and Pb(II).
研究领域:
环境科学
·
材料科学
·
化学工程
·
污染控制
·
吸附技术
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2015
·
IF 3.699
Feng Ding,Sizhao Zhang,Xuegang Luo,Xiaoyan Lin
A novel S/BiOCl thermocatalyst in response to heat excitation was successfully synthesized by a one-step method and then added into polymeric matrix to give corresponding films. The results obtained show that the surfaces of as-prepared films with S/BiOCl were truly degraded via thermocatalytic reactions at ambient conditions. The average molecular weights of experimental films have fallen dramatically, comparing to the comparisons. In addition, the changes of chemical groups were simultaneously observed in the process. Thus this thermocatalytic process maybe a very fascinating route to come true the degradation of polymeric films with lower temperature triggered.
研究领域:
材料科学
·
高分子化学
·
环境功能材料
·
催化化学
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）