JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Wenxing Jiang,Qiqi Wan,Endao Zhang,Yingying Liu,Junbo Hou,Min Yang,Xiaodong Zhuang,Changchun Ke
This study presents a novel direct methylhydrazine fuel cell (DMHFC) utilizing a hydrothermally synthesized Pd-Ni(OH) 2 composite catalyst supported on nickel foam (Pd-Ni(OH) 2 /NF) as the anode. The Pd-Ni(OH) 2 /NF features a three-dimensional hierarchical architecture with dispersed Pd nanoparticles (0.08 mg cm −2 ) chemically anchored via Pd-O-Ni bonds in the Ni(OH) 2 nanosheet matrix, as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) analyses. The electrode demonstrates superior electrocatalytic activity for the methylhydrazine oxidation reaction (MHOR), attributed to enhanced active site accessibility, charge transfer efficiency, and optimized mass transport. Differential electrochemical mass spectrometry (DEMS) reveals complete oxidation of hydrazine fragments to N 2 with suppressed NH 3 byproduct formation relative to Pd/C. Systematic optimization of operating conditions yields a peak power density of 30.5 mW cm −2 (oxygen as the oxidant, 80 °C) and 110 mW cm −2 (hydrogen peroxide as the oxidant, 80 °C), with performance trade-offs observed between reaction kinetics and fuel crossover. This work validates the feasibility of DMHFC technology, highlighting the potential of methylhydrazine as a high-energy-density fuel for portable systems, while providing insights into electrode design and performance optimization for advanced energy conversion devices.
研究领域:
电化学
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能源材料
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催化化学
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燃料电池技术
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DOI
高影响因子
PHYSICS LETTERS A
·
2024
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IF 2.3
Ting-ting Yan,Ran Jiang,Dong-yang Xi,Long Ma,Dan-dan Zhang,Yi-fei Xu
This study investigated the structural stability of 1-methylhydantoin (1-MH, C 4 H 6 N 2 O 2 ) Form-I at room temperature using Raman spectroscopy and a diamond anvil cell (DAC) for high-pressure experiments. Two phase transitions were identified at pressures of 0.6–1.7 GPa and 3.4–6.7 GPa. After complete release of pressure, the spectrum aligned with the Raman spectrum at ambient pressure, indicating reversibility of the phase transition. Analysis of Hirshfeld surface energy and fingerprints was conducted to assess changes in intermolecular interactions, revealing that the phase transitions are associated with rearrangements in the hydrogen-bonded network.
研究领域:
物理化学
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材料科学
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DOI
高影响因子
Inorganics
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2023
·Vol. 11
·期 4
·168
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IF 2.9
Chongzhu Hu,Zhuangzhuang Zhang,Jun Chen,Peng Gao
Organic-inorganic hybrid perovskites are highly efficient in photovoltaic applications, making the commercialization of perovskite solar cells (PSCs) possible. However, the high density of defects on the surface significantly affects the performance of PSCs. To address this issue, we have demonstrated a facile post-treatment strategy utilizing methylhydrazine iodide (MHyI) to passivate the surface of the perovskite film. MHyI could co-ordinate with the dangling bonds on the surface of perovskite films, effectively passivating defects in the film and suppressing carrier non-radiative recombination. As a result, PSCs with MHyI modification exhibit a champion power conversion efficiency (PCE) of 23.19% and a high open-circuit voltage (VOC) of 1.14 V (0.43 V voltage deficit). Moreover, unencapsulated solar cells maintain their initial efficiency of 88% after 30 days of exposure to ambient air with 30% humidity, and the devices with encapsulation retained 57% of their initial efficiency after 200 h of maximum power point (MPP) loading under constant light irradiation in ambient air. Overall, our results provide a facile method for improving the performance and stability of PSCs.Keywords:post-treatment;surface defect passivation;methylhydrazine iodide;high performance;perovskite solar cell
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
TALANTA
·
2025
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IF 6.1
Weiyi Bu,Yan Zhang,Dan Huang,You Zhou,Na Liu,Wenjiang Han,Xiaohong Chuai,Zhijie Zhou,Changhua Hu,Geyu Lu
Due to the unique physiochemical properties of ionic liquids, they are extensively used as agent or solvent in the synthesis process of nanomaterials. The tailored growth process of functional nanomaterials might result in performance modification for them. In this work, In 2 O 3 nanoparticles were prepared via the hydrothermal method and subsequent calcination (400°C, 500°C, 600°C and 700°C). An ionic liquid (1-hexadecyl-3-methylimidazolium chloride, [C 16 Mim] Cl) was introduced in the hydrothermal process. After calcination, trace of [C 16 Mim] Cl inclusion in In 2 O 3 was pyrolyzed with Cl residue (Cl-In 2 O 3 ). In compare with control sample synthesized without [C 16 Mim] Cl (pure In 2 O 3 ), In 2 O 3 -600 (Cl-In 2 O 3 calcinated at 600°C) exhibited an excellent UDMH sensing performance at 225°C. The fabricated sensor achieved a high response value (71.0 ± 2.1 to 100 ppm), rapid response time (2 s), good selectivity and a low theoretical limit of detection (1.72 ppb) to UDMH gas. Various characterizations, in regard to oxygen vacancy, surface texture structure, energy band structure and surface acidity, were utilized to analyze the cause for enhanced performance. The ionic liquid inclusion increases the contents of adsorbed oxygen species and improves the adsorption capacity to UDMH gas. This work indicates that the synthesized In 2 O 3 nanoparticles could be the potential candidates for rapid UDMH detection in some specific application scenarios.
研究领域:
材料科学
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化学传感器
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纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xianghong Ren,Yizhi Zeng
Unsymmetrical dimethylhydrazine (UDMH), as a high-energy liquid rocket fuel widely used for space launches, inevitably produces huge volumes of UDMH wastewater during use. As UDMH and its byproducts are both highly toxic, this poses a major threat to the ecological environment and human body, making it an urgent need to develop an efficient, environmentally friendly treatment for UDMH wastewater. Photocatalysis is well recognized for being less costly and more environmentally friendly, yet as traditional photocatalysts are usually available in the form of powder, the photogenerated carriers cannot be well separated or effectively recycled. In this study, a composite photocatalyst featuring a three-dimensional core-shell array structure consisting of a TiO 2 crystal seed layer, a TiO 2 nanorod array core and a CeO 2 nanoparticle shell is created over the surface of recyclable carbon fiber by means of layer-by-layer loading. The TiO 2 rutile/anatase phase heterointerface and TiO 2 /CeO 2 heterointerface allow efficient separation and migration of photogenerated electrons and holes in the three-dimensional space. Under simulated solar irradiation, our new structure degrades 100 mg/L UDMH wastewater by up to 97.3 % within 240 min. More importantly, it shows good reusability and recyclability. Our research offers a practicable option for the efficient degradation of UDMH wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
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2023
·Vol. 13
·期 5
·2993-3003
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IF 3.9
YiZhi Zeng,Feng Zhou,Yuan Gao
In the present research, the preparation process parameters of TiO2 nanotube arrays (TNAs) prepared by anodic oxidation were systematically studied by the orthogonal experimental method for the first time. Herein, the parameters of nine factors were optimized; the optimal parameters were: the electrolyte was a 0.2 mol L−1 NaF solution with 3% vol H2O at pH 7, the anodic oxidation voltage was 40 V, the electrode spacing was 4 cm and the reaction was carried out for 60 minutes. The physicochemical properties of the materials were characterized by SEM, XRD, EDS, UV-vis, and PL spectroscopy. By electrodeposition of Bi2O3 modified TNAs, the degradation rate of unsymmetrical dimethylhydrazine (UDMH) wastewater on the TNAs-10 was 89.14% within 10 h, which was 2.69 times that on pure TNAs. A bias potential of +0.3 V (vs. open circuit potential) was applied to the modified TNAs-10. The degradation rate of UDMH was significantly enhanced on the TNAs-10 (bias) process as compared to the TNAs-10 process. The degradation rate of UDMH wastewater on TNAs-10 (bias) exhibited an exponential distribution. UDMH and its toxic by-products FDMH, NDMA were completely degraded after 8 h.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Linlu Shen,Hongyi Wang,Jing Kang,Jimin Shen,Pengwei Yan,Yingxu Gong,Jiaxu Zhang,Gang Fu,Shuyu Wang,Yizhen Cheng,Shengxin Zhao,Zhonglin Chen
In this study, the ultraviolet/peroxymonosulfate (UV/PMS) process was found to be an efficient and safe strategy for simultaneously controlling NDMA during the degradation of N,N-dimethylhydrazine compounds, such as 1,1,1′,1′-Tetramethyl-4,4′-(methylene-di-p-phenylene) disemicarbazide (TMDS). The distinct roles of sulfate radicals (SO 4 − ), hydroxyl radicals (HO ), PMS, and UV in TMDS degradation as well as NDMA formation and elimination, have been elucidated, involving the kinetics and multiple-path transformation mechanisms. Moreover, to assess the feasibility of this process, a comprehensive toxicity assessment of treated water for zebrafish embryos was conducted. Mineralization analysis and an assessment of electrical energy per order (EE/O) were performed on actual water samples. The results indicate that SO 4 − , HO , PMS, and UV together degraded TMDS, but only SO 4 − and PMS led to NDMA formation. UV irradiation may coordinate SO 4 − and HO to overcome the energy barriers of NDMA elimination by providing continuous energy. The degradation of TMDS involved hydroxylation, radical addition, bond cleavage and nitrosation. Notably, NDMA formation may be closely related to the electron transfer between SO 4 − or PMS and TMDS. Subsequently, the generated NDMA was controlled through photocleavage, radical addition, and hydroxylation. Additionally, the results of toxicity evaluation and EE/O analysis suggest UV/PMS is safe and has the potential for treating N,N-dimethylhydrazine compounds-containing water.
研究领域:
环境科学
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毒理学
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水处理工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Tingting Fan,Xiangwei He,Hengchao E,Yanmei Zhang,Xiaobei Li,Xujiao Li,Xianli Yang,Changyan Zhou,Zhiyong Zhao,Xiaoyan Zhao
Gyromitrin is the main toxic metabolite produced from the false morel such as Gyromitra esculenta , which has a long history of causing food poisoning. However, how to identify the gyromitrin-induced poisoning is difficult because the biomarker of gyromitrin in vivo is still unclear. In this study, a novel isotope-coded method combined with the derivatization strategy was first developed for the accurate quantification of gyromitrin in urine and plasma by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The major parameters affecting the derivatization efficiency were systematically investigated, and the p-tolualdehyde-d 4 was employed to form the isotope internal standard. The developed method was fully validated with the limit of detection (LOD) of 1 µg/L in urine and plasma. The recoveries were between 88 % and 111 % with the inter-day precision less than 13 %. An exposure study in 12 rats was conducted to determine urinary excretion of gyromitrin and its metabolite monomethylhydrazine (MMH). The mean urinary excretion rates of gyromitrin were 3.45 % (low dose) and 4.93 % (high dose), while the excretion rate of MMH were 0.20 % and 0.36 %. After exposure for 48 h, no gyromitrin and MMH was detected in rat urine. The results suggested that gyromitrin is a valuable biomarker for identification of gyromitrin-induced mushroom poisoning.
研究领域:
毒理学
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分析化学
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食品安全
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产品关联
DOI
高影响因子
WORLD JOURNAL OF GASTROENTEROLOGY
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2020
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IF 3.665
Yu Wang,Hei-Ying Jin,Ming-Zhi Fang,Xiao-Feng Wang,Hao Chen,Shu-Liang Huang,De-Song Kong,Min Li,Xiu Zhang,Yu Sun,Shui-Ming Wang
BACKGROUND Epigallocatechin gallate (EGCG) is a polyhydroxy phenolic compound extracted from tea and its antitumor effect has received widespread attention. We explored the inhibitory effect of EGCG on dimethylhydrazine (DMH)-induced colorectal cancer (CRC) using a rat model, predicted the interaction between EGCG and CRC target genes using a database, and explained the EGCG associated target pathways and mechanisms in CRC. AIM To understand the inhibitory mechanisms of EGCG on CRC cell proliferation and identify its pharmacological targets by network pharmacology analysis. METHODS DMH (40 mg/kg, s.c., twice weekly for eight weeks) was used to induce CRC in rats. After model establishment, the rats were administered with EGCG (50, 100, or 200 mg/kg, p.o., once daily for eight weeks) and killed 12 and 20 wk after the start of the experiment. Formation of aberrant crypt foci and tumor was studied by histological analysis. Using network pharmacology analysis, candidate and collective targets of EGCG and CRC were identified, and Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes analyses were used to predict the pathways altered by EGCG. RESULTS At week 12, high-dose EGCG treatment significantly reduced the tumor formation rate, total number of tumors, cancerous and non-cancerous tumors, tumor volume, ascites formation, and aberrant crypt foci count. At week 20, all three doses of EGCG were effective. Seventy-eight collective targets of EGCG and CRC were identified, of which 28 genes were dysregulated in CRC. Kyoto Encyclopedia of Genes and Genomes and GO analyses showed that the dysregulated genes were enriched in hsa05210 (CRC), hsa04115 (p53 signaling pathway), and hsa04151 (PI3K-Akt signaling pathway), GO:0043124 (negative regulation of I-kappaB kinase/NF-kappaB signaling pathway), GO:0043409 (negative regulation of mitogen-activated protein kinase cascade), and GO:2001244 (positive regulation of intrinsic apoptotic signaling pathway) respectively. CONCLUSION EGCG inhibits the formation of DMH-induced CRC by regulating key pathways involved in tumorigenesis.
研究领域:
肿瘤学
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药理学
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分子生物学
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DOI
PubMed
高影响因子
Journal of Functional Foods
·
2018
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IF 3.47
Yaser Gamallat,Xiaomeng Ren,Williams Walana,Abdo Meyiah,Ren Xinxiu,Yanyan Zhu,Meiqi Li,Siyuan Song,Luhan Xie,Yazeed Jamalat,Mohammad Zubair Saleem,Yufang Ma,Yi Xin,Dong Shang
Lactobacillus rhamnosus (LGG) is well documented strain with wide clinical applications. We investigated herein the possible protection role of LGG in against early preneoplastic colon carcinogenesis Aberrant crypt foci (ACF) in rat model. Sprague Dawley rats were pre-treated with or without LGG via oral gavage, followed by ACF induction with Dimethylhydrazine (DMH). LGG treated groups showed significant decrease in total number of ACF’s, and increased Bax, P53, and Caspase-3 proteins expression with significant attenuation of NFkB, Cox2 and β catenin expression compared to DMH group. Serum cytokines array revealed significant elevation of IL-2, IL-6, and IFN-γ, and attenuated level of IL-10 in LGG+DMH treated animals. Finally, the 16S rRNA fecal microbiome genomic analysis showed that LGG alters the gut microbiome structure, composition and functions at phylum, family and genus level. Collectively, LGG reduces colon ACFs incidence and multiplicity via inhibition of pro-carcinogenesis biomarkers and modulate the gut microbiome.
研究领域:
胃肠病学
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微生物学
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肿瘤学
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分子生物学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Ying Han,Jihe Wang,Jun Li,Zhonglin Chen,Weiwei Li,Beibei Jiang,Jie Yao
Copper corrosion products (Cu(OH)2, Cu2O, CuO and Cu2CO3(OH)2) were applied to catalyze the reduction of N-Nitrosodimethylamine (NDMA) with iron. All the copper corrosion products showed catalytic abilities. Lower pH values and DO concentrations facilitated NDMA reduction in most cases. 1,1-dimethylhydrazine (unsymmetrical dimethylhydrazine, UDMH) and dimethylamine (DMA) formed during the degradation of NDMA. There were also some undetected products. Catalytic hydrogenation was proposed as the mechanism. The catalytic systems did not promote the formation of hydrogen atoms. The dissolved copper ions in these systems were too sparse to enhance the reaction. The smooth iron surface and formation of Cu2O in each catalytic system explained the enhancement of NDMA removal. Different surface morphologies and states of Cu2O accounted for the differences in NDMA removal and kinetics between the reaction systems. This technique could be an alternative for NDMA reduction and could broaden the application of copper corrosion products.
研究领域:
环境科学
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化学工程
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水处理
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Zhuangzhuang Zhang,Shining Geng,Jiaoxia Zhang,Zilong Zhang,Qiu Xiong,Lusheng Liang,Ruixiang Mi,Zewen Xiao,Rosario Scopelliti,Peng Gao
We present a homologous series (CH3(NH2)2)2PbX4 (X = Cl, Br, I) of the Ruddlesden–Popper two-dimensional (2D) perovskite series. The new A-site cation (methyl hydrazinium, MHy) stemming from an atomic permutation of formamidine shows unique hydrogen-bond-stabilized 2D structures contrasting ethyl amine (CH3CH2NH3) and formamidine (NHCHNH2) as revealed by single-crystal X-ray diffraction. The subtle manipulation of the tolerance factor leads to (CH3(NH2)2)2PbX4 with the smallest interlayer spacing among the reported R–P 2D perovskites. A combined density functional theory calculation and experimental study assist in interpreting these disparate (electronic) structures/properties brought by similar cations. First-principles calculations also confirm the direct bandgap nature of (CH3(NH2)2)2PbI4 with wide valence and conduction bandwidths. After studying different colloidal behavior in the common polar solvents, we continued with the characterization based on the thin film samples. The homologous series (CH3(NH2)2)(CH3NH3)nPbnI3n+1 (n = 1, 2, 3, 4) multidimensional (MD) perovskite films show a characteristic decrease of the bandgap as n increases. The potential of these MD perovskites toward planar junction solar cell applications was assessed, and an initial power conversion efficiency of 5.83% was obtained from the (CH3(NH2)2)2(CH3NH3)3Pb4I13 perovskite, with reasonable stability after aging for 1200 h. This new cation provides new chances for many more homologous 2D halide perovskites for solid-state photovoltaics and other applications.
研究领域:
材料科学
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化学
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物理
·
太阳能
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）