ADVANCED FUNCTIONAL MATERIALS
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2024
·
IF 18.5
Adekunle Adedapo Obisanya,Liang Ma,Jinkang Liu,Tianshuo Yang,Zhibin Ren,Xinyi Tan,Faming Gao,Jianren Wang
Prussian blue analogues (PBAs) are a class of promising materials for capacitive deionization. However, the kinetic mismatch between their slow ion storage rate and the demand from short-time desalination severely limits their desalination performance. Here, a group of structure-tuneable Ni-Mn PBAs have been developed by a combination strategy of surface-protected chemical etching and Ostwald ripening to study their ion storage kinetics. Treating them as demos, the characterizations and investigations, e.g., in situ XRD in a three-electrode system, dynamic impedance, finite element simulation, and DFT calculations etc., reveal that the slow ion diffusion caused by the severe agglomeration of the nanoparticles and the unsuitable lattice parameter controls the final desalination behavior. Therefore, the correspondingly optimized sample (HC-t) possessing a microscale hollow structure, nanoscale shell thickness, and expanded lattice, displays a fast ion storage kinetics with the ratio of surface-controlled current as high as 82% at a scan rate of 20 mV s −1 . Consequently, it delivers an impressive desalination capacity of 120.8 mg g −1 (2.06 mmol g −1 Na + ) with a fast average desalination rate of 0.25 mg g −1 s −1 (0.004 mmol g −1 s −1 ) at 1.2 V, competitive with those reported in the literature. Moreover, the elucidation of the structure-performance correlation provides valuable insights for the development and design of next-generation PBAs for capacitive deionization (CDI).
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
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IF 17.7
Meng Liu,Caixia Miao,Yumeng Fo,Wenxuan Wang,Yao Ning,Shengqi Chu,Weiyu Song,Ying Zhang,Jian Liu,Zhijie Wu,Wenhao Luo
Precisely tailoring metal single-atoms within zeolite scattfolds and understanding the origin of the unique behavior of such atomically dispersed catalysts are pivotal and challenge in chemistry and catalysis. Herein, we have successfully fabricated Ni single-atoms within BEA zeolite (Ni 1 @Beta) through a facile in situ two-step hydrothermal strategy, notably without using any chelating agent for stabilizing Ni species. With the aid of advanced characterization techniques, such as aberration-corrected high-angle annular dark-field scanning transmission electron microscopy, X-ray absorption spectroscopy, etc., and combined with density functional theory calculations, the nature and micro-environment of isolated Ni species, which are incorporated within 6-membered rings and stabilized by four skeletal oxygens of Beta zeolite, have been identified. The as-obtained Ni 1 @Beta exhibits a superior performance in terms of activity (with a turnover frequency value up to 114.1 h –1 ) and stability (for 5 consecutive runs) in the selective hydrogenation of furfural, surpassing those of Ni nanoparticle analogues and previously reported Ni-based heterogeneous catalysts. This study provides an efficient strategy for the fabrication of non-noble metal single-atoms within zeolites, which could be of great help for the design of metal-zeolite combinations in the chemoselective reactions involved in biomass conversion and beyond.
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Journal of Energy Storage
·
2024
·
IF 8.9
Xuefeng Yu,Dongjie Yang,Jinhao Huang,Qiliang Chen,Weifeng Liu,Fangbao Fu,Xueqing Qiu
Nickel oxide is considered a promising anode material for lithium-ion batteries. Nevertheless, its performance is hindered by significant volume expansion and low electrical conductivity, particularly at larger particle sizes, which lead to a notable decrease in lithium storage capacity and rate performance. To address these challenges, we introduce a nanocomposite strategy to synthesise nickel oxide and lignin-derived porous carbon composites (LPC/Ni/NiO). Through in situ polymerization, lignin macromolecules form a uniform 3D network with nickel carbonate, which, during the subsequent carbonisation process, results in the formation of nickel oxide within a conductive carbon network. This approach reduces the nickel oxide to nanosize and enhances the composite's electrical conductivity, effectively integrating the buffering framework of porous carbon with the high storage capacity of nickel oxide. As a result, the LPC/Ni/NiO composite exhibited significantly improved lithium storage capacity. Notably, when employed as an anode material in lithium-ion half-cells, the optimized composite maintained an excellent specific capacity of 1065 mAh/g after 100 cycles at a current density of 0.2 A/g. It also shown exceptional rate performance, delivering a specific discharge capacity of 505 mAh/g at a current density of 2 A/g, with stable cycling performance. The electrochemical reaction process was further validated using in ex-situ EIS. This study offers valuable insights into scalable synthesis methods for oxide nanocomposites, highlighting their potential as promising anode materials for lithium-ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Man Zhao,Liwu Qiang,Meng Bai,He Xiao,Li Zhang,Junming Zhang,Tianjun Hu,Baoliang Lv,Shengxiang Wang,Jianfeng Jia
Rational design of Ni-based electrocatalysts for methanol electrooxidation reaction (MOR) and in-depth understanding of their catalytic mechanism remain a challenge. Herein, carbon dots/graphene heterostructure is constructed to load Ni(OH) 2 and the role of carbon dots focuses on regulating distribution and electronic property of Ni(OH) 2 . Regulation mechanism of carbon dots on Ni(OH) 2 for optimizing MOR activity are revealed by in-situ Raman, in-situ FTIR, operando electrochemical impedance spectroscopy, X-ray absorption fine structure (XAFS) spectroscopy, and so on. It’s found carbon dots could disperse Ni species and regulate their distribution configuration. Appropriate amount of carbon dots promotes the formation of highly dispersed CDs&Ni(OH) 2 type. Because of strong interaction between Ni(OH) 2 and CDs, coordination environment and local electronic structure of Ni in Ni-CDs/G can be regulated by carbon dots, leading to phase-ratio variation of α-Ni(OH) 2 /β‑Ni(OH) 2 and d-band center shift of Ni(OH) 2 . For the best Ni-4CDs/G electrocatalyst, more formed α-Ni(OH) 2 lead to d-band center downshift from the E F level and optimized its adsorption of methanol. Ni-4CDs/G shows the specific activity of 299.2 mA cm −2 and mass activity of 3756.5 mA mg −1 at peak current. In water splitting test, lower initial overpotential of 140 mV is found in methanol electrolysis than that in water electrolysis. This opens a new door to regulate the metal-based electrocatalysts by CDs and will inspire more people to explore CDs-based materials for electrocatalytic application.
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IONICS
·
2024
·
IF 2.4
Wu Fang,Ge Jin-Long,Zhu Yujun,Jiao Yuhong,Wu Zhong,Feng Chao,Zhao Yupei,Li Qiu
The development of high-performance and cost-effective electrocatalysts toward the oxygen evolution reaction (OER) is remarkably desirable but challenging. Herein, we design and fabricate a sea urchin-like S-doped Ni(OH) 2 electrocatalyst on nickel foam using a simple hydrothermal method, followed by treatment with Na 2 S solution. The introduction of S not only modulates the electronic structure of Ni(OH) 2 , but also improves the electronic conductivity, thus enhancing the OER performance of Ni(OH) 2 . Owing to the free-standing feature, modified electronic structure, and sea urchin-like structure, the optimized S-Ni(OH) 2 –30 min delivers excellent OER performance with overpotentials of 306 and 392 mV at 10 and 100 mA cm −2 , respectively, Tafel slope of 89.2 mV dec −1 , and stability for 30 h at 50 mA cm −2 . This work demonstrates the importance of incorporating S in Ni(OH) 2 to optimize the electronic structure for improving OER activity and provides a promising pathway to synthesize Ni(OH) 2 -based electrocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Haifeng Ru,Yanji Bao,Yifeng Wang,Xiaohong Wang,Jinchun Tu,Qiang Wu,Yi Li,Lei Ding
Direct seawater electrolysis offers a viable solution to the excessive consumption of fresh water resources in existing industrial electrolytic water processes. However, electrolysis efficiency and material stability are affected by electrode material corrosion caused by chlorine evolution reactions (CER) at the anode positions. In this study, the prepared S-Ni-MOF/Fe-MOF material exhibits an exceptional performance in the oxygen evolution reaction (OER) both in alkaline solution and seawater. Specifically, the material achieves low overpotentials of 281 and 279 mV in 1.0 M KOH and alkaline seawater at 100 mA cm −2 current density, and maintains stability for at least 100 h in both electrolyte solutions. The electronic structure of MOF-on-MOF was modulated through the introduction of S 2− , which induced a large number of vacancies. Furthermore, the reconstruction process on the material surface was accelerated by the formation of NiOOH and FeOOH, that served as protective layers and prevented the corrosion of the electrode material by Cl − , thereby enhancing its stability in seawater. Furthermore, computational studies have indicated that the Fe-Ni active sites at the heterointerface exhibit a synergistic effect, which has been confirmed by density functional theory (DFT) calculations. These results prove that this combination significantly reduces the energy barrier associated with the OER. Consequently, the reaction process is accelerated.
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Molecular Catalysis
·
2025
·
IF 4.9
Jun Ma,Shiyan Li,Bing Xu,Wei Chu,Qian Jiang,Yuefeng Liu
Converting CO 2 from the coal chemical industry into natural gas via methanation reaction, coupled with green hydrogen, is a promising strategy for reducing carbon emissions. While Ni-based catalysts are cost-effective and widely used for CO 2 methanation, their performance is often hindered by low temperatures activity. We confined LaO x species within the mesoporous silica (mSiO 2 ) channels to serve as a support for Ni-based CO 2 methanation catalysts. The results demonstrate that LaO x introduction (3.9 wt%) significantly improves CO 2 conversion from 38.2 % to 74.4 %, while enhancing CH 4 selectivity from 94.8 % to 99.7 % at 300 °C. Interestingly, excessive La loading does not noticeably reduce the promotion efficiency. Detailed characterization revealed that ultrafine LaO x species anchored within silica framework improved the dispersion and reduction of Ni nanoparticles and served as strong basic sites to promote CO 2 dissociation. In-situ DRIFT and isotope studies demonstrated that LaO x facilitated the hydrogenation of formate intermediates, enhancing both CO 2 conversion and CH 4 selectivity. In addition, LaO x endowed the support with hydrogen spillover capability, enabling active H from Ni nanoparticles to migrate to LaO x sites and accelerate the conversion of formate intermediates into CH 4 . These results underscore the potential of LaO x -modified mesoporous silica to optimize Ni-based catalysts, offering valuable guidance for the design of high-performance CO 2 hydrogenation catalyst supports.
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ELECTROCHIMICA ACTA
·
2024
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IF 5.5
Lu Zhang,Di Yang,Zhigao Ma,Zijian Deng,Zhou Li,Dietmar Drummer,Bingyan Jiang
Polymeric micro features tend to deform and break under the demolding force during injection molding process, which becomes a bottleneck problem limiting its precision manufacturing. To reduce the polymer-mold interfacial adhesion, nickel-polytetrafluoroethylene (Ni-PTFE) nanocomposite molds with low surface adhesion and high wear resistance were manufactured via pulse current electroforming. The electrodeposited Ni-PTFE nanocomposite showed a good hydrophobic property and low friction coefficient (between 0.1 and 0.3) than pure nickel (0.78). Compared with direct current, pulse current electrodeposition was beneficial to reduce the crystallite size and internal stress, thus improving the wear resistance and reducing the cracking defects. The hardness of pulse current electrodeposited Ni-PTFE reached 442.3 HV, which was 51.7 % higher than that of pure nickel. Compared to nickel mold, Ni-PTFE nanocomposite mold significantly improved the dimensional accuracy of molded microfluidic chips. This study systematically investigates the Ni-PTFE nanocomposite electroforming process under both direct and pulse currents, which provides a new approach for the manufacturing of high-performance precision injection mold insert.
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高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Yiye Guo,Mouren Miao,Yun-Xiao Wang,Chunxing Yan,Jin Liu,Yuliang Cao,Hanxi Yang,Xinping Ai,Fu-Sheng Ke
A full cell via pairing high-capacity silicon anode with high-voltage NMC cathode (Li(Ni 0.83 Co 0.12 Mn 0.05 )O 2 ) holds great promise as a high-energy battery system for practical applications. Nevertheless, this potential has been hindered by challenges in terms of the pulverization of Si particles, unstable electrode/electrolyte interface, and severe dissolution of transition metals at high voltage. Herein, we present a novel high-voltage and weakly solvating electrolyte, consisted of lithium bis(fluorosulfonyl)imide in mixed solvent of diethyl carbonate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, which effectively enables the remarkable cycling stability of both micron silicon anode (a high reversible capacity of 1667 mAh g −1 after 200 cycles) and Ni-rich cathode (a notable capacity retention of 83% after 140 cycles at an ultrahigh cut-off voltage of 4.9 V). It is revealed that the tailored electrolyte leads to the formation of a robust and reinforced concrete-like solid electrolyte interphase, characterized by a distinctive vertical side-by-side columnar structure comprised of LiF and sulfide on the micro-silicon anode. Meanwhile, a uniform and thin cathode-electrolyte interphase is observed on the surface of NMC particles when cycled in the designed electrolyte. Furthermore, coupled with high-capacity micro-Si and high-voltage NMC, this designed electrolyte endows a remarkable full-cell with high energy density (475 Wh kg −1 ), excellent rate capability, and high-voltage cycling stability. This research contributes a pioneering approach to enabling the utilization of micron-sized silicon anodes and Ni-rich cathodes for next-generation high-energy lithium-ion batteries.
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ELECTROCHEMISTRY
·
2020
·Vol. 88
·期 6
·532-539
·
IF 1.099
Ruifang CHEN,BiXia WEN,Changwei SU,Wei BAI,Junming GUO
LiMn2O4 cathodes are prepared by a rapid microwave-induced solution combustion method. Their initial discharge capacity is significantly improved by introducing trace Ni. For example, the LiMn1.975Ni0.025O4 (LMNO-0.025) cathode releases an initial discharge capacity of 134.1 mAh g−1 at 1 C, even 144.5 mAh g−1 at 0.5 C, which is far higher than of the pristine LiMn2O4 cathode (119.7 mAh g−1 at 1 C) and close to its theoretical capacity of 148.2 mAh g−1. After 1000 cycles, the capacity retention of the LMNO-0.025 sample reaches 56.53 % at 1 C, and it can be presented the higher capacity retentions of 66.79 % at 5 C and 66.89 % at 20 C. The robust structure stability proved by XRD, SEM and HRTEM data, and the good kinetics testified by CV and EIS data of the Ni-doped material are responsible to improve the high-rate capability and long cycle properties.
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Coatings
·
2026
·Vol. 16
·期 10
·1168
·
IF 3.4
Yunqing Xia,Shaomu Wen,Ming Wen,Ying Xiong,Hongjie Li,Guochuan Tu,Aiwei Sun,Lifen Tong
In this study, we attempted to use the response surface methodology with temperature, pH and thiourea concentration as control variables by systematically varying the experimental parameters in order to find the optimal preparation process for electroless deposition of Ni-B coatings. A mathematical model of the effect of different experimental parameters on the impedance of Ni-B coating was constructed by selecting the Box–Behnken Design (BBD) design, and the optimum plating solution temperature, pH and thiourea concentration for electroless deposition of Ni-B coating were discussed through optimization analysis. The surface microstructure of the Ni-B coating was characterized by SEM. The chemical composition of the Ni-B coating was analyzed by XRD and EDS, and the corrosion resistance of the coating was characterized by EIS and potentiodynamic polarization techniques. The results showed that the best morphology and the best corrosion resistance of the coatings were achieved when the plating solution temperature was 69.31 °C, the plating solution pH was 6.06, and the concentration of thiourea was 0.0015 g/L. The predicted impedance value was 5828.77 Ω, while the impedance value of the prepared coating based on the experimental setup parameters was 6041 Ω.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
X. Li,J. Li,Y. Zhang,P. Zhao
Ni-MOF derived NiO nanosheets growing on rGO have been successfully synthesized by a hydrothermal method following by a series of calcination procedures (300 °C, 400 °C, and 450 °C). The influence of the introduction of rGO and the calcination temperature on electrochemical performance of Ni - MOF derived NiO nanosheets as the electrode material were highlighted in detail. For the three-electrode test system, Ni-MOF derived NiO/rGO composites subjected to calcination at 300 °C demonstrated the highest specific capacitance (435.25 F·g −1 at 1 A·g −1 ), and maintained 68.00% of its initial value at 8 A·g −1 . Its specific capacitance was increased by 49.34% when compared with the initial value after 25,000 cycles at 50 mV·s −1 . With the increase in calcination temperature, the specific capacitance presented the downward tendency (400 °C: 171.50 F·g −1 at 1 A·g −1 , 450 °C: 116.00 F·g −1 at 1 A·g −1 ) due to the reduction in specific surface area originating from the agglomeration of NiO nanosheets. The introduction of rGO greatly enhanced the electrochemical performance of the composites treated at 300 °C (increased by 40.40% at 1 A·g −1 and 47.30% in specific capacitance at 8 A·g −1 ). The assembled hybrid supercapacitors (HSC) with Ni-MOF derived NiO/rGO composites (300 °C) and active carbon as the cathode and anode also displayed the outstanding electrochemical performance. The value of energy density reached to 76.96 Wh·kg −1 at the power density of 400 W·kg −1 . All these results confirm that the MOF-derived NiO/ rGO composite should be a potential electrode material for supercapacitors .
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