RARE METALS
·
2021
·Vol. 41
·期 1
·96-105
·
IF 4.003
Zhao Jin-Jin,Su Xiao,Mi Zhou,Zhang Ying,Hu Yan-Jun,Guo Hua-Jun,Jiao Yi-Nan,Zhang Yu-Xia,Shi Yan,Hao Wei-Zhong,Wu Jing-Wei,Wang Yi,Gao Cun-Fa,Cao Guo-Zhong
Organic–inorganic hybrid perovskite solar cells, one of the most promising photovoltaic devices, have made great progress in their efficiency and preparation technology. In this study, uniform, highly conductive Li n NiO x (0 ≤ n ≤ 1; 0< x ≤ 3) films were prepared by electrochemical deposition for a range of Li concentration. Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni 3+ ↔ Ni 2+ as the interfacial passivation. Depending on the amount of lithium doping, controlled interfacial oxidation was induced by Ni 3+ . The Li 0.32 NiO x inhibited charge recombination, reduced the defect density, and enhanced the photocurrent density. A maximum power conversion efficiency of 20.44% was obtained by Li 0.32 NiO x . Further, in the long-term, in-air stabilities of unencapsulated Li n NiO x perovskite solar cells were demonstrated. Graphic abstract
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Environmental Chemistry Letters
·
2021
·Vol. 19
·期 4
·3511-3515
·
IF 9.027
Si Huimin,Che Mingda,Chen Zhiguo,Qiu Sha,Cui Mei,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Chloroform is an harmful chlorinated hydrocarbon which is hardly degraded using actual dechlorination methods. Alternatively, carboxymethyl cellulose/zero-valent iron appears promising to degrade chlorinated hydrocarbons in water, yet actually carboxymethyl cellulose cannot inhibit the oxidation and sedimentation of iron ions under alkaline condition. Here, polyethylene glycol, a green and low-cost non-ionic polymer, was used as a stabilizer to synthesize polyethylene glycol-stabilized Fe/Ni nanoparticles (PEG-Fe/Ni) for removing chloroform from water in a wide range of pH, from 3 to 11. PEG-Fe/Ni was prepared by a stepwise liquid-phase chemical reduction, then added into groundwater to remove chloroform. Results show that polyethylene glycol can both reduce the particle size from 106.9 to 79.6 nm and prevent the oxidation and sedimentation of iron ions under alkaline condition. The removal efficiency of chloroform increased from 86.3 to 100% at pH 6 in the presence of polyethylene glycol, and slightly decreased to 95.4% at pH 11. The calculated rate constant ( k ) indicates that chloroform removal follows pseudo-first-order kinetics. Furthermore, the PEG-Fe/Ni also removed chloroform from real groundwater at pH 8 with an efficiency of 90.1% in 4 h, which is higher than that for Fe/Ni nanoparticles, of 41.7%.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 5
·1407-1416
·
IF 3.186
Hong Liang,Yang Jing,Li Yongzheng,Gao Xin,Song Wuling,Zhang Hongxi
Lignocellulosic biofuels are the most promising sustainable fuels for supplementing shrinking fossil resources. In this work, acid-modified vermiculite (AVM)-supported Pd–Ni bimetallic catalyst (Pd–Ni/AVM) was investigated for the hydrodeoxygenation of bio-oil and its model compounds to assess its reactivity. Pd–Ni/AVM was found to efficiently hydrodeoxygenate the investigated model compound (phenol). The phenol conversion reached 94% at 0.5% of Ni loading and temperatures beyond 513 K. Using these parameters, the phenolic hydroxyl group was removed, and the C = C bonds were saturated. This catalyst was also efficient in the hydrodeoxygenation of bio-oil. H 2 -TPR experiments elucidated the synergistic effects between the active component and the carrier, which were considered the main reason for the catalytic activity. Strong influences of the Ni loading and temperature on the hydrogenation of phenol were also observed when the Pd loading was fixed at 1 wt%. Graphic Abstract
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14472-14477
·
IF 5.236
Hongjing Wang,Shiqian Jiao,Songliang Liu,Hugang Zhang,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Graphical The mesoporous PdNi/Ni nanoparticles assembled nanotubes (mPdNi/Ni NTs) have been synthesized via replacement reaction, in which nickel nanowires serve as sacrificial template to form tubular structure and the diblock copolymer induce the formation of mesoporous structures. Due to the mesoporous nanoparticle structure and tubular geometry, the mPdNi/Ni NTs have better catalytic performance than mesoporous Pd nanotubes and commercial Pd black for ethanol oxidation reaction. The optimization of structure and composition is essential to improve the performance of catalysts. Herein, mesoporous nanoparticles assembled PdNi/Ni nanotubes (mPdNi/Ni NTs) are successfully fabricated using nickel nanowires as sacrificial template. The combination of nanotubular structure with mesoporous nanoparticle morphology can provide facilitated transfer channels and sufficient active sites, allowing the full contact and reaction between catalysts and reactants. Therefore, the synthesized mPdNi/Ni NTs exhibite superior ethanol oxidation performance to mesoporous Pd nanotubes and commercial Pd black. This study proposes a rational strategy for the development of nanoparticle assembled nanotubes with surface mesoporous morphology, which can greatly improve catalytic performance in various electrocatalytic fields.
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Shuhan Dong,Yang Yang,Tingting Liang,Ruina Ma,An Du,Mingxu Yang,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Superhydrophobic coating technology is a promising anticorrosion method for metals. In this paper, a simple composite electrodeposition technique is proposed, in which micron-sized B 4 C particles are added to the electrolyte to construct Ni-B 4 C composite coating which exhibits a unique micro-nano structure. The addition of B 4 C particles promotes the construction of rough structure and enhances the corrosion resistance of the coating. When the B 4 C content is 3 g/L, the contact angle of the coating modified using a low surface energy material, reaches 162.5 ± 2°. The coating exhibits an excellent barrier effect against the corrosive medium. The superhydrophobic coating (M B-3 ) displays excellent corrosion resistance, and the corrosion protection efficiency reaches 99.53% in 3.5 wt% NaCl solution. The corrosion current density of M B-3 is 7.95 × 10 −8 A/cm 2 , which is three orders of magnitude lower than that of the pure Ni coating (M B-0 ). The addition of B 4 C promotes the growth of the coating, resulting in excellent shielding and stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xue Wang,Hanping Zhang,Quanguo Zhai,Yucheng Jiang,Mancheng Hu,Shuni Li
In this work, the high-quality protonated Ni-doped MnO 2 (H–Ni–MnO 2 NRs) nanorods with a mean diameter of about 15 nm were synthesized by a hydrothermal method , which was successfully applied to Cs + adsorption under electrochemical process. The as-prepared H–Ni–MnO 2 NRs showed high selectivity to Cs + adsorption in both acidic and neutral media. In particular, the amount of Cs + adsorption increased with increasing solution pH. The adsorption capacity of H–Ni–MnO 2 NRs for Cs + could reach up to 11.5 mmol·g −1 at pH 7, much higher than previous reports (0.06–6 mmol·g −1 ). The high adsorption of H–Ni–MnO 2 NRs ability could be attributed to their especial morphology, Ni doping, and Mn(III) amount enhancement induced by electrochemical reduction .
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Haowei Li,Xinlai Zheng,Huimin Zhang,Xuehui Li,Jinxing Long
Novel strategies for converting renewable lignin to bulk petrochemicals are highly desirable for achieving sustainable practices in the age of environmental awareness. Herein, we propose an efficient approach for the selective hydrogenolysis of lignin promoted by a cost-effective La3+-doped Ni/MgO catalyst. The results reveal that 84.44% lignin is converted at 270 °C for 4 h, yielding 16.50% volatile products. Importantly, approximately 43.45% of these volatile products are identified as 4-ethyl phenol (7.17% yield), an important intermediate in the fine chemical industry. Intensive analysis of the lignin before and after the reaction confirms that efficient cleavage of the ester linkages is achieved, which correlates directly with the high selectivity of 4-ethyl phenol after a readily decarboxylation reaction. Furthermore, the catalyst characterization demonstrates that La3+ suppresses the formation of a NiMgOx solid solution. Consequently, a greater degree of Ni2+ becomes reducible and the catalyst basicity becomes stronger, both of which are essential for the efficient lignin depolymerization and char reduction. As a result, a significant increase of the yield of volatile products is shown along with a substantial inhibition of biochar formation over the La-doped Ni/MgO catalyst in comparison with that without La doping. Therefore, the present work provides a new insight on producing fine chemicals via a sustainable route.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Jiahuan He,Zhendong Yao,Xuezhang Xiao,Wenzheng Chen,Ziwei Huang,Xiulin Fan,Zhong Dong,Xu Huang,Xuancheng Wang,Man Chen,Lixin Chen
The hydrolysis of AB has been regarded as a kind of secure and efficient method for hydrogen generation. However, the development of economical and stable catalysts with high catalytic activities remains a bottleneck for realizing further industrial application of AB. Herein, high-loading heterostructured Ni/NiO nanoparticles with different Ni/NiO weight ratios anchored on one-dimensional porous MoOx nanorods (denoted as Ni/NiO@MoOx) have been synthesized and introduced into the hydrolysis of AB for the first time. The Ni/NiO@MoOx-50H catalyst (synthesized under the reduction atmosphere of 50% H2/50% Ar) with an optimal Ni/NiO weight ratio (73.96/26.04) exhibits an excellent catalytic activity for the hydrolysis of AB with the turnover frequency (TOF) value reaching 86.29 molH2 molNi–1 min–1 at 298 K, which is one of the highest TOF values among the reported non-noble metal catalysts. In addition, on account of high Ni loading weight (29.15 wt %), the hydrogen generation rate of Ni/NiO@MoOx-50H achieves 10,478 mL·min–1 g–1 (35,947 mL·min–1 gNi–1), overtaking most values both in noble and non-noble metal catalysts for the hydrolysis of AB. The bridging effect of NiO steadily connects the Ni and MoOx carrier and promotes great durability of Ni/NiO@MoOx-50H, of which the catalytic activity exhibits not significant degradation in the fifth cycle. The catalysis originated from the metal/metal oxide (Ni/NiO@MoOx) provides a novel insight into the catalyst design, preparation, and application for chemical hydrogen storage systems.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhoufeng Bian,Wenqi Zhong,Yang Yu,Zhigang Wang,Bo Jiang,Sibudjing Kawi
Catalysts of Ni supported on home-made mesoporous alumina (Ni/M-Al 2 O 3 ) were prepared via facile incipient impregnation method and calcined under different temperature (500–800 °C). Compared with catalysts of Ni supported on commercial alumina, they showed much higher conversion and lower carbon deposition in methane dry reforming (DRM). Among the catalysts, Ni/M-Al 2 O 3 -700 exhibited the highest DRM activity, with 77.6% CH 4 conversion and 85.4% CO 2 conversion at 700 °C. TPR revealed that almost all the Ni was in the form of NiAl 2 O 4 spinel after calcination at 700 °C. Due to the strong metal-support interaction of NiAl 2 O 4 structure, the Ni crystal size of Ni/M-Al 2 O 3 -700 after reduction was around 5 nm. TGA and TEM results showed its carbon deposition after 20 h DRM test was only 3.8% and mainly in the form of amorphous carbon . This work indicates that the formation of NiAl 2 O 4 spinel is beneficial to activity and stability towards DRM reaction and controlling calcination temperature is crucial.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
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PHYTOMEDICINE
·
2021
·
IF 5.34
Yajie Cai,Bing Xu,Fei Zhou,Jianzhi Wu,Shuo Li,Qi Zheng,Yajing Li,Xiaojiaoyang Li,Feng Gao,Shifen Dong,Runping Liu
Background Ulcerative colitis (UC) is a chronic relapsing inflammatory disease that markedly elevates the risk of colon cancers and results in disability. The disrupted immune homeostasis has been recognized as a predominant player in the pathogenesis of UC. However, the overall remission rate of current therapies based on immunoregulation is still unsatisfactory. Si-Ni-San (SNS) has been found effective in relieving UC through thousands of years of clinical practice, yet the specific mechanisms of the protective effect of SNS were not fully elucidated. Purpose We aim to investigate the therapeutic effects of SNS against the development of chronic colitis and the underlying mechanisms. Methods We established a DSS-induced chronic experimental colitis mouse model to evaluate the effect of SNS. RNA-sequencing, bioinformatic analysis, and in vitro studies were performed to investigate the underlying mechanisms. Results Our data demonstrated that SNS significantly ameliorated chronic experimental colitis via inhibiting the expression of genes associated with inflammatory responses. Interestingly, SNS significantly suppressed DSS-induced type I interferon (IFN) responses instead of directly downregulating the production of pro-inflammatory cytokines, such as Il-6. In vitro study further found that SNS selectively inhibited STING and RIG-I pathway-induced type I IFN responses by modulating TBK1- and IRF3-dependent signaling transduction. SNS also suppressed the expression of IFN-stimulated genes by directly inhibiting STAT1 and STAT2 activation. Conclusion Our study not only provides novel insights into the pathogenic role of type I IFN responses in colitis but also suggested that SNS or bioactive compounds derived from SNS may serve as novel therapeutic strategies for the treatment of UC via interfering type I IFN-mediated inflammation.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuejia Liu,Wenqiang Zhao,Xianliang Li,Jiaqiang Liu,Yide Han,Junbiao Wu,Xia Zhang,Yan Xu
Hierarchical α-Fe 2 O 3 microcubes supported on Ni foam (NF) have been successfully prepared using Fe-MOF as a precursor combined with a hydrolysis process, which can be used as the electrodes directly for effective non-enzymatic glucose sensing. The structures and compositions of the as-prepared α-Fe 2 O 3 /NF electrode materials were carefully characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS), respectively. The α-Fe 2 O 3 /NF electrodes exhibit excellent glucose oxidation performance with a response time < 3 s and a sensitivity of 10,356 μA mM −1 cm −2 . Additionally, the material shows good anti-interference sensing performance and stability for glucose detection in the presence of ascorbic acid (AA), dopamine (DA), cysteine (Cys), uric acid (UA), NaCl and other interferences. It is believed that α-Fe 2 O 3 /NF composite can act as a promising electrode material for non-enzymatic glucose sensing applications, and the materials design strategy can be also expanded for other functional systems.
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