ELECTROCHEMISTRY COMMUNICATIONS
·
2009
·
IF 4.194
Xianghua Zeng,Zhimei Li,Zhiyin Xiao,Yanwei Wang,Xiaoming Liu
The synthesis and characterisation of two diiron hexacarbonyl complexes [Fe 2 (SXS)(CO) 6 ], 1 (SXS = (( − SCH 2 ) 2 C(CH 3 )CH 2 OCOFc, Fc = ferrocenyl group) and 2 (SXS = ( − SCH 2 CH 2 NHCOFc) 2 ), were described. By using intramolecularly integrated ferrocenyl group(s) in the complexes as an internal standard, the nature of two stepwise one-electron processes of the complexes coupled with a chemical reaction was clearly demonstrated. Examining how the reduction transformed into sole one-electron process with both increasing scanning rate under Ar/CO atmosphere and lowering temperature indicated conclusively that the reduction of both complexes couples to a chemical reaction which involves CO-loss.
研究领域:
无机化学
·
生物无机化学
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DOI
高影响因子
Frontiers in Chemistry
·
2026
·
IF 5.3
Zhaoyu Meng
The conversion of CO 2 to CO using electrochemistry requires the use of earth abundant catalysts with high selectivity, rapid reaction rate, and durability. In this work, hierarchically porous Co–N–C catalysts were synthesized via co-pyrolysis of a bimetallic zeolitic imidazolate framework (Zn/Co) and the dicyandiamide (DCD) followed by acid etching. By systematically adjusting the pyrolysis temperature (800 °C–1,000 °C) and the Co feed ratio (5–20 mol%), volcano-type activity relationships are found, which are controlled by the interplay of the three factors graphitization, nitrogen retention, and the density of Co–N x sites. The optimized catalyst CoNC-900 achieves a Faradaic efficiency of CO of 94.9% ± 1.0% at −0.75 V vs. RHE in CO 2 -saturated 0.5 M KHCO 3 with a CO partial current density of 16.0 mA cm −2 , a lower bound turnover frequency of ≥0.33 s −1 and ≈11% current decay FE_CO retained above 92% over 24 h. The observed selectivity can be rationalized, as the density functional theory calculations indicate that the barrier of the rate-determining step, namely the formation of COOH is lowered on the Co–N 4 moiety (0.42 eV, whereas ≥1.79 eV on the metal-free nitrogen sites). A transferable design rule is developed for CO 2 electrolysis that relates bimetallic MOF precursor chemistry, hierarchical porosity, and M–N x site engineering.
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Houlin Wang,Shuting Luo,Xinghao Li,Wei Liu,Xiaodong Wu,Duan Weng,Shuang Liu
Developing catalysts with high cost-efficiency, good oxidation activities and strong thermal resistance is an ongoing task. Herein, we present the design and synthesis of confined catalysts with Ag protected by alumina. Thermal treatment at 800 °C for 10 h caused neither silver loss nor deactivation of this catalyst. Instead, nano-particles of Ag formed because of the heat/O 2 -derived ripening. These highly dispersed silver species and the catalyst’s mesoporous structure worked in tandem to achieve good catalytic performance for oxidation reactions, which made the aged sample a good candidate as CO elimination and gasoline particulate filter catalysts.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 4
·F264
·
IF 3.12
Yuxia Pan,Maomao Tu,Xiaoqin Shi,Qi Zhang,Xiaoyu Guo,Mengzhu Li,Yiping Wu,Ye Ying,Ying Wen,Haifeng Yang
The direct methanol fuel cell calls for designing various highly active catalysts containing less platinum, still keeping with reasonable stability. In this work, through controlling reaction system under acidic media (pH = 1), ∼3 nm PtPd nanoparticles are dispersed onto the TiO2 support (3PtPd/TiO2) via a facile one-pot hydrothermal route. In comparison with that of homemade Pt/TiO2 and commercial Pt black catalysts, as-synthesized 3PtPd/TiO2 shows a better performance for directly electrochemical catalysis of methanol and simultaneously exhibits high ability against poison from carbon oxide species. Clearly, the optimized usage of anatase TiO2 not only enhances catalytic activity due to the metal-support interactions but also improves long durability, which could be attributed to the OH existing at the surfaces of TiO2 and Pd.
研究领域:
材料科学
·
电化学
·
能源科学
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DOI
高影响因子
CATALYSIS LETTERS
·
2023
·Vol. 154
·期 5
·2386-2395
·
IF 2.8
Xu Hui,Xing Feifei,Guo Yue,Wang Fei,Feng Junfeng,Li Hui,Jiang Xiaoxiang
To explore a green, cheap, and high-performance catalyst for lipid hydrotreatment into green diesel, the non-noble metal catalysts (Fe, Cu, Co, Ni, and Mo) with Al 2 O 3 carrier were prepared. Their catalytic performance in oleic acid hydrotreatment was compared, and the metal loading was studied. The characterizations (XRD, N 2 physical sorption, H 2 -TPR, and XPS) were utilized to elucidate the catalytic property. In oleic acid hydrotreatment, the catalytic activity of 5 monometallic catalysts was in the following order: Co > Mo > Ni > Fe > Cu, and the Co/Al 2 O 3 catalyst achieved 94.4% conversion and 91.8% alkane yield. Among 6 Co loadings (5, 10, 15, 20, 25, and 30 wt%), 25 wt% was optimal because it reached the balance of the surface area and the number of Co active sites. Moreover, the lipid hydrotreatment over Co/Al 2 O 3 catalyst occurred mainly via DCX/DCN route; meanwhile, the cracking reaction also happened. Graphical Abstract
研究领域:
能源化学
·
催化科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Diancheng Duan,Shixi Zhong,Junlang Huo,Jiaxiang Chen,Xiudong Shi,Hongliang Peng,Xiuhua Li,Shijun Liao
Improving the activity and durability of carbon-based catalysts is a key challenge for their application in fuel cells. Herein, we report a highly active and durable Co/N co-doped carbon (Co N C) catalyst prepared via pyrolysis of Co–doped zeolitic–imidazolate framework–8 (ZIF–8), which was synthesized by controlling the feeding sequence to enable Co to replace Zn in the metal–organic framework (MOF). The catalyst exhibited excellent oxygen reduction reaction (ORR) performance, while the half-wave potential decreased by only 8 mV after 5,000 accelerated stress test (AST) cycles in an acidic solution. Furthermore, the catalyst exhibited satisfactory cathodic catalytic performance when utilized in a hydrogen/oxygen single proton exchange membrane (PEM) fuel cell and a Zn-air battery, yielding maximum power densities of 530 and 164 mW cm −2 , respectively. X-ray absorption spectroscopy (XAS) and high-angle annular dark field-scanning transmission electron microscopy (HAAD–STEM) analyses revealed that Co was present in the catalyst as single atoms coordinated with N to form Co–N moieties, which results in the high catalytic performance. These results show that the reported catalyst is a promising material for inclusion into future fuel cell designs.
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiaolin Shi,Guo Yang,Bo Xing,Caiyi Jiang,Hangdao Qin,Min Li,Fuping Zhang,Yi Wang,Dongzheng Wang,Xingyong Liu
Fluorine-containing wastewater seriously threatens human health due to the wide application of sodium p -perfluorous nonenoxybenzenesulfonate (OBS). Herein, a novel Fe-Co bimetallic biochar (Fe-Co@BC) with abundant pore structure, functional groups and quickly electron transfer capability was prepared using hydrothermal method. Meanwhile, Fe-Co@BC-Ⅰ exhibited a superior catalytic capacity for degradation of OBS in PMS system, and the removal efficiency of OBS reached to 94.1 % within 60 min. After three cycles, the removal efficiency of OBS still up to 80 % and the Fe-Co had almost no leaching (Fe: 0.006 mg/L; Co: 0.023 mg/L). Further mechanistic insights were verified that high catalytic capacity and stability ascribed to the synergistic effects of Fe and Co, where Fe-Co mutual interaction promoted the formation of Fe 2+ and Co 2+ and accelerated electron transfer of catalyst. In addition, the quenching experiments and electron paramagnetic resonance (EPR) proved that the degradation of OBS can be mainly ascribed to indirect oxidation of SO 4 −• , O 2 −• and •OH, and the possible degradation pathway of OBS was proposed in the Fe-Co@BC/PMS system. This study provides an insight into bimetallic prepared and activation PMS degradation fluorinated wastewater.
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 292
·期 3
·653-660
·
IF 2.161
Luo Jing,Zhou Qun,Sun Jun,Liu Ren,Liu Xiaoya
Well-defined water-dispersible polyaniline (PANI) nanoparticles were synthesized by in situ chemical oxidative polymerization of aniline in the presence of an amphiphilic P(AMPS- co -VM) copolymer micelle. P(AMPS- co -VM) copolymer was prepared by the free radical polymerization of 7-(4-vinylbenzyloxyl)-4-methyl-coumarin (VM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) which can self-assemble into micelles in aqueous solution. Here, P(AMPS- co -VM) copolymer micelle is used not only as soft template but also as acid dopant in our reaction system. The structure, size, and morphology of PANI nanoparticles were characterized by various experimental techniques. It is found that the morphology and the size of the PANI nanoparticles strongly depend on the molecular characteristics of the P(AMPS- co -VM) copolymer. The synthesized PANI nanoparticles behaved as particulate emulsifier for the stabilization of oil-in-water emulsions.
研究领域:
材料科学
·
化学工程
·
纳米技术
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DOI
高影响因子
Particuology
·
2021
·
IF 3.067
Huilin Yi,Shuliang Lu,Jiajia Wu,Yujun Wang,Guangsheng Luo
In this paper, we present a parallelized microfluidic device with improved ladder–tree distributors for the scaled-up production of monodisperse microspheres. Owing to the improved distribution form comprising a ladder distributor in the center and tree distributors around the circumference, the uniformity of the generated droplets for our device was improved by 32.9% and 86.1% compared to those achieved in devices with conventional tree and ladder distributors, respectively, in the final production stage with 32 droplet generators, indicating the potential of our device for further scale-up while maintaining the monodispersity of the generated droplets. The effect of the 2D scale-up of our device was investigated by varying the continuous-phase flow rate and viscosity. Using our device, γ-Al 2 O 3 microspheres with a diameter of 598.1 μm and a CV of 2.58%, as catalyst support for microreactors, were continuously synthesized at high production rate. The nickel-based catalyst prepared from γ-Al 2 O 3 microspheres with large specific surface area and pore volume had an average NiO size of 14 nm, which was 60.9% of that supported on industrial support. The CO methanation conversion of the Ni@Al 2 O 3 microspheres was 1.7 times larger than Ni@Al 2 O 3 industrial support at 140 °C.
研究领域:
化学工程
·
材料科学
·
催化反应
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DOI
高影响因子
Batteries & Supercaps
·
2026
·Vol. 9
·期 6
·e70340
·
IF 4.5
Maolong Xu,Xudong Zhang,Yuanjie Zhang,Guorong Hu,Zhongdong Peng,Yanbing Cao,Ke Du
Spinel LiNi 0.5 Mn 1.5 O 4 is a promising high-voltage cathode material for lithium-ion batteries, but its application is limited by Mn dissolution and poor high-temperature stability. Herein, Al-doped, Co-doped, and Al/Co codoped LNMO materials were synthesized via a high-temperature solid-state method. All samples retain the spinel structure (Fd m), while Al and Co doping reduces Mn 3+ content, induces lattice contraction, and enhances structural stability. The Al/Co codoped LNMO exhibits reduced polarization, enhanced Li + diffusion kinetics, and improved cycling and rate performance. Notably, it retains 96.7% of its initial capacity after 100 cycles at 50°C and 1°C, accompanied by suppressed Mn dissolution. These results demonstrate that Al/Co codoping is an effective strategy to improve the structural and electrochemical stability of LNMO under high-temperature conditions. Graphical Al/Co codoping reduces the Mn³ + content and suppresses Mn dissolution, thereby stabilizing the crystal structure and electrode/electrolyte interface, significantly enhancing the cycling stability and capacity retention of LNMO at elevated temperatures.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Chao Wang,Qing Zhang,Cong Liu,Haishun Jiang,Wan Zhou,Muhammad Nadeem,Qiaoliang Bao,Yoshio Bando,Ding Yuan,Yuhai Dou
The slow kinetics of the anodic oxygen evolution reaction (OER) impose a major limitation on overall water electrolysis, creating a demand for highly active catalysts. Transition metal selenides (TMSs) offer favorable electrical conductivity, inexpensive constituents, and adjustable electronic configurations; however, their inherent catalytic activity is still insufficient. In this study, nanorod-like Fe/Co co-doped NiSe (Fe,Co-NiSe) was prepared by hydrothermally forming NiSe and subsequently introducing Fe and Co through a simple soaking treatment. The simultaneous incorporation of Fe and Co effectively tunes the electronic structure of NiSe. Raman measurements performed in situ show that introducing Fe/Co favors the generation of NiOOH-type oxyhydroxide species, thereby enhancing OER activity. 18O-labeling differential electrochemical mass spectrometry confirms that Fe,Co-NiSe follows the conventional adsorbate evolution mechanism. Density functional theory (DFT) analysis further indicates that Fe-induced electronic redistribution at Co sites raises the Co d-band position and reduces the Gibbs energy required for the kinetically limiting *O → *OOH conversion. Consequently, under alkaline conditions, Fe,Co-NiSe reaches 10 mA cm-2 at an overpotential of 229 mV and sustains 50 mA cm-2 for 300 h. When employed as the anodic electrode in an anion exchange membrane (AEM) water electrolyzer coupled with Pt/C, this electrolyzer delivers 1 A cm-2 while registering a cell voltage of 1.84 V.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yan Wu,Tao Liu,Bin Ji,Wei Wang
Iron-cobalt alloy is a potential and economical magnetostrictive material, however, our microscopic understanding of the co-electrodeposition process of Fe-Co alloys is still unsatisfactory. In this work, a flat Fe-Co film with 10 μm was successfully prepared by electrodeposition with a non-toxic sulfate solution. The effects of (NH 4 ) 2 SO 4 , an important additive, were studied and DFT calculation was used to analyze the mechanism of (NH 4 ) 2 SO 4 . EIS shows that (NH 4 ) 2 SO 4 can promote the Fe-Co co-deposition process and obviously inhibits the hydrogen evolution reaction. In addition, (NH 4 ) 2 SO 4 can significantly reduce the internal stress of the Fe-Co film by 110,000 MPa, so that the cracks caused by the internal stress are obviously removed. The results of quantum chemistry calculation further show that NH 4 + is more inclined to adsorb on Fe-Co surface than H 2 O and H + , which reduces the hydrogen evolution on the electrode surface. The results are beneficial to improve the Fe-Co co-deposition process, reduce the internal stress and to prepare a high-performance Fe-Co magnetic film. The films will be assembled on the electronic devices with sensors.
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高影响因子
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