Carbon Neutralization
·
2024
·
IF 0
Longwei Li,Rongrong Li,Shaojie Zhou,Wenjun Xu,Yu Li,Jingmin Zhang,Lei Gao,Xiong Pu
Zinc bromine flow batteries (ZBFBs) are well suited for stationary energy storage due to their attractive features of high energy density and low cost. Nevertheless, the ZBFBs suffer from low power density and limited efficiency owing to the relatively severe polarization of the Br 2 /Br − redox couple. Herein, a three-dimensional (3D) hierarchical composite electrode based on core-shell Ni/NiO heterostructures anchored on graphite felt (Ni/NiO@GF) is designed to promote the kinetics of the Br 2 /Br − couple, so as to improve the power density and efficiency of the ZBFB. In this design, the highly conductive carbon felt and Ni cores provide a composite electrode with a 3D electron transporting framework to guarantee excellent electronic conductivity, while the NiO shells possess great absorption ability to Br 2 and brilliant catalytic activity for the Br 2 /Br − redox reaction to reduce the electrochemical polarization. As a result, an enhanced ZBFB with Ni/NiO@GF electrode shows an outstanding energy efficiency of 86% at 20 mA cm −2 and can be operated at a current density of up to 160 mA cm −2 with a respectable energy efficiency of 67%. These results exhibit a promising strategy to fabricate catalytic electrodes for high-performance ZBFBs.
研究领域:
电化学
·
能源存储
·
材料科学
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yu Zhang,Zhuozhi Ouyang,Yankai Dong,Jianhua Zhao,Hong Zhang,Xiaohan Li,Chi Zhang,Xiwang Tang,Xuetao Guo,Lingyan Zhu
The development of a novel type of high-efficient biochar (BC) is important for the removal of tetracycline (TC). In this study, a bimetallic nickel/copper-loaded BC (Ni/Cu-BC) was synthesized, which had not been used for TC removal and lacked research on its safety and stability. The adsorption process was more likely to be monolayer chemical adsorption from the experiment. The density functional theory (DFT) calculation revealed that the interaction energy (E ads ), energy gap (E g ) and dipole moment (P(D)) confirmed that the bimetallic loading improved the adsorption strength of the BC to TC. Moreover, the distribution of Ni/Cu-BC surface charge was considerably different from BC after bimetallic loading, and local polarization occurred according to the analysis of molecular surface electrostatic potential (ESP). It was demonstrated that the π-π interaction and complexation played a crucial role in the removal of TC. Finally, the functional groups of Ni/Cu-BC in removal were in the following order: C O > C C > NH 2 > M O > C O. This study proves that Ni/Cu-BC is a novel, high-efficient, safe and reusable adsorbent. Overall, this study provides a new perspective on the design of BC and develops its environmental applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 5
·1418-1426
·
IF 2.372
Ma Yuan,Liu Jiao,Chu Mo,Yue Junrong,Cui Yanbin,Xu Guangwen
Abstract The key challenge for CO 2 methanation, an eight-electron process under kinetic limitation, relies on the design of non-noble metal catalysts so as to achieve high activity at low reaction temperatures. In this work, four Ni-based catalysts with different supports were prepared and tested for CO 2 methanation at 250–550 °C in a fixed bed quartz reactor and further characterized to reveal the structure–function relationship. The Ni-based catalysts followed an activity order of Ni/CeO 2 > Ni/Al 2 O 3 > Ni/TiO 2 > Ni/ZrO 2 , especially at temperatures lower than 350 °C. H 2 -TPR and TPD results indicated that the interaction between nickel and support was strong and the metallic nickel was well dispersed in the Ni/Al 2 O 3 catalyst, while more amount of CO 2 was adsorbed on the weak basic sites in the Ni/CeO 2 catalyst. By establishing the correlation between the catalytic performance and the catalyst structure, it was found that the Ni nanoparticles and basic support serve as H 2 and CO 2 active centers respectively and cooperatively catalyze CO 2 methanation, resulting in high low-temperature reaction activity. Graphic Abstract High CO 2 conversion was achieved over Ni/CeO 2 catalyst at 300 °C for its high H 2 uptake on Ni nanoparticles and high CO 2 adsorption capacity on the support with weak basic sites and cooperatively to catalyze CO 2 methanation.
研究领域:
催化化学
·
能源化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Peng Zhou,Xingshuai Lv,Yugang Gao,Zihao Cui,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang
Water dissociation, hydrogen adsorption and hydrogen desorption are three important processes for the electrocatalytic hydrogen evolution reaction in alkaline solution. According to the previous report that V–O species can promote the dissociation of water in the oxygen evolution reaction (OER), we wondered if introduction of V–O species to hydrogen evolution reaction (HER) electrocatalyst could also enhance water dissociation, and consequently improve the HER performance. To check this assumption, novel Ni/V 2 O 3 composite was prepared. The obtained electrode exhibits excellent performance including much lower overpotential (44 mV at 10 mA cm −2 ) and Tafel slope value (38 mV dec −1 ) compared to pure Ni and V 2 O 3 electrodes. In addition, the performance of Ni/V 2 O 3 is comparable to commercial Pt/C electrode. V 2 O 3 was proved to increase the Electrochemical Active Surface Area (ECSA) of Ni/V 2 O 3 , which is an important reason for the increased HER performance of Ni/V 2 O 3 . Besides that, according to the combined results of Temperature-Programed Reduction (TPR) measurement, CO 2 Adsorption, Contact Angle test and Density Functional Theory (DFT) calculation, it is believed that introduction of V 2 O 3 can promote the process of water dissociation as expected, as well as the hydrogen adsorption-desorption, and bubble separation, all of which together improves the HER performance of non-noble metal Ni.
研究领域:
材料科学
·
电催化
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 7
·1781-1791
·
IF 3.709
Yuying Ma,Haixia Zhao,Dongze Ma,Junmei Zhang
(Synthesis, characterization, and catalytic behaviour of nano-bimetallic nickel oxide on the thermal decomposition of dihydroxylammonium-5,5′-bistetrazole-1,1′-diolate) Bimetal combustion catalyst has become an emerging field in recent years, which is still in its infancy. When the combustion catalyst is used in double-base propellants, it can produce effects that conventional catalysts cannot achieve. In this study, nano-bimetallic nickel oxides (nanospheres of NiFe 2 O 4 and the sub-nanometre flower NiCo 2 O 4 ) were prepared by hydrothermal method and characterized using X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and N2 adsorption–desorption test (BET). Moreover, its thermal catalytic action on dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) was studied. The thermal analysis of composite TKX-50/NiFe 2 O 4 and TKX-50/NiCo 2 O 4 was carried out by thermogravimetric differential scanning calorimetry (TG-DSC). The results show that when the addition amount of NiFe2O4 is 10%, the heating rate is 5.0 K min −1 , the NiFe 2 O 4 has the best catalytic activity for TKX-50 thermal decomposition, and the high thermal decomposition peak temperature (Tpeak1) is decreased by 29 °C. More interestingly, the apparent activation energies of the two composites were calculated by Kissinger, Ozawa, and Starink methods. The advanced thermal analysis kinetics software (AKTS) was used to perform kinetic calculations on the DSC experimental curves of the above-mentioned composite energetic materials, and reaction rate curves obtained by the simulation are in good agreement with the experimental curves of the thermal decomposition reaction process, further proving that the accuracy of the experiment is high. Therefore, the addition of NiFe 2 O 4 shows high catalytic efficiency on the thermal decomposition of TKX-50 components, and this would be beneficial to promote the burning rate of propellants containing TKX-50 components. © 2022 Society of Chemical Industry (SCI).
研究领域:
材料科学
·
推进剂化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Huafan Li,Weijia Han,Tianli Zhu,Ligong Chen,Luis Ricardez-Sandoval,Guoyi Bai
In this work, a NiTi-MMO/TiO 2 -R catalyst was prepared by in-situ generation of a TiO 2 support during hydrothermal synthesis of the hydrotalcite precursor for NiTi-MMO. The formation of NiTi-MMO can reduce the size of metallic Ni particles, which can significantly improve the catalyst's activity, and the in-situ generated TiO 2 support can enhance the dispersion of NiTi-MMO and the utilization efficiency of the active nickel species. The NiTi-MMO/TiO 2 -R catalyst showed high activity for the hydrogenation of dioctyl phthalate to dioctyl-1,2-cyclohexanedicarboxylate. The catalyst also exhibited good stability, maintaining the yield over 90 % after 6 cycles. Characterization results showed that a strong metal-support interaction was formed between the in-situ generated TiO 2 support and the metallic Ni particles produced by the reduction of NiTi-MMO. The strong metal-support interactions formed between metallic Ni particles and the in-situ generated TiO 2 played a crucial role in stabilizing the nickel species and preventing their aggregation, resulting in superior catalytic performance.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 3
·721-731
·
IF 8.273
Xu Hui,Jin Meng,Geng Jing,Zhang Shengbo,Zhang Haimin
The decentralized production of H 2 O 2 via a two-electron oxygen reduction reaction (2e − ORR) has emerged as a promising alternative to the energy-intensive anthraquinone (AQ) process. However, its practical application requires 2e − ORR electrocatalysts with high activity and selectivity. Herein, we report the synthesis of metallic Ni nanoparticles anchored on bacterial cellulose-derived carbon fibers (Ni-NPs/BCCF) via a facile impregnation-pyrolysis method as efficient electrocatalysts for 2e − ORR to H 2 O 2 . By tuning the amount of Ni precursor, the best electrocatalytic performance toward 2e − ORR was achieved for Ni-NPs/BCCF-20.7, affording a high H 2 O 2 selectivity of ∼90% and an onset potential of 0.75 V vs. reversible hydrogen electrode (RHE) in an alkaline electrolyte. Ni-NPs/BCCF-20.7 achieved the largest H 2 O 2 yield rate of 162.7 ± 13.7 mmol g cat −1 h −1 and the highest Faradaic efficiency of 93.9% ± 4.2% at 0.2 and 0.5 V vs. RHE from the bulk ORR system, respectively. Theoretical calculations revealed the more favorable “end-on” adsorption configuration of molecular oxygen on the exposed Ni(111) plane, which can effectively suppress the O-O bond dissociation, resulting in high selectivity for H 2 O 2 generation.
研究领域:
材料化学
·
电化学
·
纳米催化
·
能源科学
·
环境工程
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 13
·期 2
·468-478
·
IF 6.177
Xinyu Lu,Xiaoli Gu
The chemical demand for alkyl phenols (mainly extracted from fossil-derived resources) has been increasingly growing, which has accelerated global energy shortages. Due to the inherent aromaticity of lignin, its effective conversion into alkyl phenols is central to its adoption as a sustainable precursor to produce biochemicals. In this study, catalytic transfer hydrogenation (CTH) of alkali lignin was carried out in a mixed medium (isopropanol/formic acid) at 240 °C for 8 h over a series of bimetallic Ni based catalysts. The acidity and reducibility of the as-prepared catalysts are enhanced via WO3 introduction (to form a WO3–Al2O3 mixed support) and a bimetallic synergistic effect, respectively, leading to improved catalytic activity and selectivity towards alkyl phenols. Different kinds of phenolic compounds (e.g., those with substitutions of methoxyl, alkyl, alkenyl, carbonyl, carboxyl, or hydroxyl groups) were generated over these bimetallic Ni based catalysts with various combinations of Ni + Fe/Zn/Co/Mo/Cu, which was due to their own catalytic promotion of certain reactions (e.g., hydrogenation, deoxygenation, and/or hydrogenolysis). Reaction mechanisms of lignin depolymerization were proposed according to the distribution of phenolic compounds. This work provides a comprehensive investigation on yielding alkyl phenols from lignin CTH over a series of inexpensive bimetallic Ni based catalysts (Ni/(Fe/Zn/Co/Mo/Cu)–WO3/Al2O3), and undertook a catalytic evaluation of the bimetallic synergistic effects on improving the chemical selectivity towards alky phenols, which is beneficial for lignin valorization.
研究领域:
化学工程
·
材料科学
·
可持续化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Umar Abdulbaki Danhassan,Xin Zhang,Riying Qi,Mahmoud M. Ali,Kuichuan Sheng,Hongjian Lin
Biochar (BC) is a low-cost and electroactive adsorbent for removing sulfide in aqueous media, which toxifies aquatic organisms and corrodes water treatment facilities. However, it lacks a pore structure for sulfide ion (S 2- ) mass transfer to active sites. Herein, it is shown that nickel-modified biochar (BC-Ni) adsorbed S 2- 2.72-fold faster than BC alone and attained a 1244 ± 252 mg-sulfide/g maximum adsorption capacity due to markedly increased mesopores, while BC attained 583 ± 250 mg-sulfide/g. Factors influencing S 2- sorption and theoretical sorption kinetics and isotherms models were evaluated. Structural and surface compositions of BC and BC-Ni were examined using state-of-the-art characterizations. The results suggest that S 2- was adsorbed via pore diffusion, pore filling, and cation bridging and oxidized to elemental sulfur and sulfate with quinone and hydrogen peroxide generated from dehydrogenation of hydroquinone on the BC-Ni by metallic nickel in the carbon matrix. This study would spur biomass valorization and desulfurization.
研究领域:
环境科学
·
水处理
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）