ENERGY & FUELS
·
2022
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IF 4.654
Shumei Chen,Chao Miao,Lixing Liang,Jing Ouyang
This paper reports the synthesis and CO2 methanation performance of Ni/CeO2–ZrO2 (CZ) solid solutions assembled on different clay minerals (rectorite, attapulgite, halloysite, and kaolin). The catalytic performance of the samples was examined in temperature range 200−400 °C at normal pressures. The attapulgite (ATP) assembled Ni nps-incorporated-CZ solid solution (Ni–CZA) has the highest CO2 conversion and excellent stability. The CO2 conversion of the Ni–CZA catalyst reached up to 81.2% at 400 °C, and CH4 selectivity was nearly 100%. The catalyst assembled on ATP has excellent adsorption performance and a large specific surface area, resulting in higher Ce3+ and adsorbed oxygen content, thanks to the high content of oxygen vacancies and faster oxygen transfer speed. Mechanistic analysis shows that the H2 dissociates at the Ni site, the CO2 was decomposed into CO and O, and the ATP and CZ provide hydroxyls and oxygen vacancies, respectively, in this composite catalyst.
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高影响因子
FUEL
·
2022
·
IF 8.035
Ning Zhang,Jing Wang,Wen Zhang,Yingxiu Zhao,Zemeng Dong,Zexing Wu,Guang-Rui Xu,Lei Wang
Despite considerable efforts to study direct alcohol fuel cells (DAFCs), the development of efficient bifunctional catalysts for monohydric alcohol and polyhydric alcohols remains a great challenge. This work reports the preparation of self-supported PdNi dendrites on Ni foam (self-supported PdNi DNTs/NF) with a large specific surface area by a simple self-sacrificing template and hydrothermal method. The presence of NF with enrichment of nucleation sites is crucial for the generation of self-supported PdNi DNTs. The as-obtained self-supported PdNi DNTs/NF exhibits an excellent property for ethanol and glycerol electrooxidation with the mass activity of 2375.7 mA mg cat −1 and 2451.6 mA mg cat −1 , the specific activity of 10.07 mA cm −2 and 10.84 mA cm −2 , respectively, in alkaline media, which should attribute to abundant high-index facets and low-coordinated atoms on the edge of branches. Furthermore, the PdNi DNTs/NF exhibits outstanding long-term durability in the current–time test for 7200 s with superior anti-CO poisoning performance, possessing a potential application in DAFCs.
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高影响因子
ENERGY & FUELS
·
2022
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IF 4.654
Ziyi Liu,Mengxue Wu,Jinfu Ma
Ammonia is a very promising source of carbon-free chemical energy. However, current electrochemical technologies for ammonia use are limited by the kinetically sluggish and easily toxic catalyst surface ammonia oxidation reaction (AOR). Here, we report an AOR catalyst in which Ni, Cu, and Co are highly dispersed on single-walled carbon nanotubes (CNTs) (Ni–Cu–Co/CNT) in the form of hydroxides and hydroxyl oxides by using a one-step solvothermal method. Ni–Cu–Co/CNT, with Co doping and a support of the CNT, has shown highly efficient catalytic activity for the AOR in alkaline media. Cyclic voltammetry tests show that the catalyst has an onset potential of 0.3 V vs Ag/AgCl and a peak current of 96 mA cm–2. Density functional theory suggests that the addition of Co and a CNT leads to a lower energy barrier for the critical AOR step, which can be attributed to intermetallic synergy and metal–support interactions formed by the CNT.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Yanjie Duan,Zhixiong Huang,Xiangbin Dong,Jingyu Ren,Lin Lin,Shuhong Wu,Runping Jia,Xiaowei Xu
Transition metal oxalates have attracted people's attention owing to their low cost, low lithium insertion potential and high theoretical reversible capacities. Disappointingly, high irreversible capacity thanks to the formation of SEI as well as the consumption and exfoliation of active materials during the process of cycling severely restrict its application of it. In this work, a comprehensive evaluation of Co, Ni, Cu and Zn doped manganese oxalate was made. All samples are synthesized via facile and time-saving microwave hydrothermal method . It is intriguing that merely 30 min is required to accomplish the entire process and all samples possess fine electrochemical performance. As far as the four bimetallic oxalates, the resulting Mn 0·5 Ni 0·5 C 2 O 4 exhibits the optimum performance (746.2 mA h g −1 after 100 cycles at 0.2 A g −1 and 546.7 mA h g −1 at 1 A g −1 after 400 cycles), which can be attributed to one-dimensional rod-like morphology of Mn 0·5 Ni 0·5 C 2 O 4 as well as the synergistic and catalytic effect of Mn and Ni, resulting in faster electrode kinetics . Mn 0.5 Ni 0.5 C 2 O 4 displays incalculable potential and can be applied in the highly reversible lithium-ion batteries.
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高影响因子
JACS Au
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2021
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IF 0
Yang Wu,Chunlei Pei,Hao Tian,Tao Liu,Xianhua Zhang,Sai Chen,Quan Xiao,Xianhui Wang,Jinlong Gong
The suppression of methane and coke formation over Ni-based catalysts for low temperature ethanol steam reforming remains challenging. This paper describes the structural evolution of Fe-modified Ni/MgAl2O4 catalysts and the influence of iron species on methane and coke suppression for low temperature ethanol steam reforming. Ni–Fe alloy catalysts are gradually oxidized by water to generate Ni-rich alloy and γ-Fe2O3 species at steam-to-carbon ratio of 4. The electron transfer from iron to nickel within Ni–Fe alloy weakens the CO adsorption and effectively alleviates the CO/CO2 methanation. The oxidation capacity of γ-Fe2O3 species promotes the transformation of ethoxy to acetate groups to avoid methane formation and the elimination of carbon deposits for anticoking. Ni10Fe10/MgAl2O4 shows a superior performance with a highest H2 yield of 4.6 mol/mol ethanol at 400 °C for 15 h. This research could potentially provide instructions for the design of Ni-based catalysts for low-temperature ethanol steam reforming.
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PubMed
Journal of Energy Chemistry
·
2021
·
IF 9.676
Guojuan Hai,Jianfeng Huang,Liyun Cao,Koji Kajiyoshi,Long Wang,Liangliang Feng,Jun Chen
The electrochemical conversion is closely correlated with the electrocatalytic activities of the electrocatalyst. Herein, the urchin-like Ni-doped W 18 O 49 /NF with enriched active sites was prepared by solvothermal method followed by a low-temperature pyrolysis treatment was reported. Results demonstrate that the incorporation of Ni-doping triggers the lattice distortion of W 18 O 49 for the increasement of oxygen defects. Further, high-valent W 6+ are partially reduced to low-valent W 4+ , wherein the electrons originate from the oxidation process of Ni 2+ to Ni 3+ . The Ni 3+ ions show an enhanced orbital overlap with the OER reaction intermediates. The generated W 4+ ions contribute to release oxygen vacancies, eventually reorganizing Ni-doped W 18 O 49 /NF to unique electrochemical active species with a special amorphous-crystalline interface (AM/NiWO x /NiOOH/NF). Simultaneously, the reconstruction results in an optimized valence band and conduction band. Eventually, the resultant AM/NiWO x /NiOOH/NF with abundant active sites and improved oxidation/reduction capability exhibits more superior catalytic performance compared with the Ni-doped W 18 O 49 /NF counterpart. This study gives more insights in the electrochemical evolution of the tungsten-based oxide and provides effective strategies for optimizing the catalytic activity of materials with inherent hydrogen evolution reaction limitations.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2021
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IF 8.271
Dongdong Wang,Wanbing Gong,Jifang Zhang,Miaomiao Han,Chun Chen,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
Catalytic hydrodeoxygenation (HDO) is one of the most promising strategies to transform oxygen-rich biomass derivatives into high value-added chemicals and fuels, but highly challenging due to the lack of highly efficient nonprecious metal catalysts. Herein, we report for the first time of a facile synthetic approach to controllably fabricate well-defined Ni-Co alloy NPs confined on the tip of N-CNTs as HDO catalyst. The resultant Ni-Co alloy catalyst possesses outstanding HDO performance towards biomass-derived vanillin into 2-methoxy-4-methylphenol in water with 100% conversion efficiency and selectivity under mild reaction conditions, surpassing the reported high performance nonprecious HDO catalysts. Impressively, our experimental results also unveil that the Ni-Co alloy catalyst can be generically applied to catalyze HDO of vanillin derivatives and other aromatic aldehydes in water with 100% conversion efficiency and over 90% selectivity. Importantly, our DFT calculations and experimental results confirm that the achieved outstanding HDO catalytic performance is due to the greatly promoted selective adsorption and activation of C=O, and desorption of the activated hydrogen species by the synergism of the alloyed Ni-Co NPs . The findings of this work affords a new strategy to design and develop efficient transition metal-based catalysts for HDO reactions in water.
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高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Jia Deng,Enlai Gao,Feng Wu,Zhixiong You,Xiaozhong Li,Shuxian Gao,Li-Zhi Huang
Atomic hydrogen (H•) is highly reactive for the hydrodechlorination of trichloroethylene (TCE). In this work, we found that the coprecipitation of Ni 2+ and Fe 2+ at neutral pH led to an unprecedented catalytic generation of H•. The generated H• effectively dechlorinate TCE to nontoxic ethylene and ethane, and Fe 2+ is the only electron donor. The abundant adsorbed H• produced with a Ni/Fe ratio of 0.4 enhances hydrogen evolution reaction causing a low efficiency for hydrodechlorination. In contrast, the active absorbed H• is generated in the crystal lattice of Ni-Fe hydroxides with a Ni/Fe ratio of 3.0 causing highly efficient hydrodechlorination of TCE. This work not only reveals the mechanism of catalytic hydrodechlorination by Ni-Fe hydroxides at neutral pH, but also provides a novel approach to detoxify TCE in contaminated water using facile precipitated Ni-Fe hydroxides.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Lingyue Liu,Peng Zhou,Xiaozhi Su,Yuhang Liu,Yuhan Sun,Hongbin Yang,Heyun Fu,Xiaolei Qu,Shantang Liu,Shourong Zheng
Monitoring sulfur dioxide (SO 2 ) in the environment requires a sensor to feature adequate sensitivity, selectivity, and low detection levels. Herein, we report an ultrasensitive, low-concentration SO 2 gas sensor that employs single atoms nickel anchored on oxygen vacancy-rich SnO 2 nanorods (SAC-Ni/H-SnO 2 ) as the sensing material. The response value of the SAC-Ni/H-SnO 2 sensor to 20 ppm SO 2 is 48, and the detection limit is 100 ppb, which is superior to most of reported SO 2 sensors. In-situ DRIFTS and ESR characterization shows that the coupling effects of SAC-Ni and adjacent oxygen vacancy on SnO 2 surface, which promote the adsorption of SO 2 and activation of chemisorbed oxygen, respectively. This effective single-atom catalyst provides a new insight into complex gas sensing mechanisms and demonstrates a promising approach of using single-atom catalysts for gas sensing applications.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14478-14488
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IF 5.236
Fan Yang,Hao Guo,Yuan Chen,Mengni Xu,Wenhu Yang,Mingyue Wang,Meng Yang,Junye Zhang,Lei Sun,Tingting Zhang,Wu Yang
Graphical Nanoflower structural MnCo 2 O 4 /Ni-MOF composite prepared by in situ growth of Ni-MOF on the surface of MnCo 2 O 4 nanorods derived from Co/Mn-MOF at 600 °C has a high cycling stability and outstanding rate performance as supercapacitor electrode material. MnCo 2 O 4 is derived from a Co/Mn bimetallic metal-organic framework (MOF). Then Ni-MOF is directly grown on the surface of the obtained MnCo 2 O 4 to form a nano-flower structure with small balls. A large surface area, abundant active sites of MnCo 2 O 4 and porosity of Ni-MOF allow the prepared MnCo 2 O 4 /Ni-MOF composite material to deliver an excellent electrochemical performance. At the same time, an appropriate thermal treatment temperature of the MnCo 2 O 4 precursor is also very important for controlling the morphology of the obtained MnCo 2 O 4 and electrochemical performances of the resulted composite material including electric conductivity, specific capacitance and rate performance. The prepared MnCo 2 O 4 -600/Ni-MOF shows an ultrahigh rate performance (when the current density increases from 1 to 10 A g −1 , the capacitance retention rate is as high as 93.41 %) and good cycle stability (the assembled asymmetric supercapacitor advice delivers a capacitance retention rate of 94.74 % after 20 000 charge and discharge cycles) as well as a relatively high specific capacitance. These excellent electrochemical properties indicate that MnCo 2 O 4 /Ni-MOF has a good application prospect in the market.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
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IF 5.706
Weizhong Mao,Junhua Liu,Bingqian Yin,Deyu Kong,Shiwen Miao,Fang Wang
We propose a simple preparation route that converting biomass-derived furfural (FUR) to furfuryl alcohol (FOL) over a series of Ni-Mg-Al catalysts (NMA-n) with different molar ratios. Yield of FOL can reach 96.8 % over NMA-2 catalyst under the mild reaction conditions. There are three reasons for this high yield of FOL: (1) The introduction of different amounts of Mg and Al causes the synergistic effect to adjust the acidity and basicity of catalyst, optimal acid-base ratio (0.73:1) and Ni metal site achieve multi-centers collaborative catalysis. (2) Mesoporous structure of this catalyst provides a large number of adsorption sites. Furthermore, the highest O defect /O lattice ratio (1.79:1) create more oxygen vacancies, and then increase the adsorption sites of reactants, thereby making the catalytic activity of NMA-2 higher than most reported Ni-based catalysts. (3) Through kinetic studies, this excellent catalytic performance is related to activation energy (51.8 kJ/mol), which is lower than most reported CTH catalysts.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1541-1553
·
IF 2.647
Zeng Laiyuan,Wei Xuefeng,Miao Juan,Zhang Ruichang,Zhang Jun,Zhou Ming,Lu Weiwei
A Sb-doped SnO 2 anode modified with Ni and B was fabricated by the sol–gel method. The effect of major operation parameters of electrode preparation, such as Ni content, B content, and calcination temperature, on the mineralization degree of phenol was investigated. Response surface methodology was used to optimize the experimental conditions and evaluate the association between various operation parameters. The morphology, crystal structure, and electrocatalytic performance of the prepared SnO 2 –Sb–Ni–B anodes were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV). The optimized sol–gel preparation ratio of citric acid, ethylene glycol, tin tetrachloride, antimony trichloride, nickel chloride, and boric acid was 650:200:100:6.5:0.5:2, and the calcination temperature of the electrode was 550 °C. The SnO 2 –Sb–Ni–B anode has the highest oxygen evolution potential of 1.63 V (vs. Hg 2 /Hg 2 SO 4 ). The removal degree of phenol reached 58% within 2 h on the SnO 2 –Sb–Ni–B anode. The accelerated lifetime of the selected SnO 2 –Ni–B anode was 720 min, which was carried out in a 3-mol/L sulfuric acid solution with a current density of 500 mA/cm 2 .
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危险品化学品经营许可证（带存储）