Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Yuxin Wang,Jie Wang,Zihan Liu,Songlin Zheng,Wei Lu,Zhen He
This study developed a series of lightweight composite films with adjustable reflectivity and superior mechanical properties. Carbon fiber (CF) was electroplated with both conventional and nanocone-shaped Ni coatings to create Ni-plated carbon fiber (CF@Ni), which was then further classified into conventional Ni carbon fiber (CF@CN) and nanocone-shaped Ni carbon fiber (CF@NN). CF@Ni fibers were sheared and filtered to produce Ni-plated carbon fiber fabric (CFF@Ni), which was then encapsulated in polyimide resin (PI) to form the final thin film materials (CF@Ni/PI). The shielding performance and mechanical properties of these CF@Ni/PI thin films have been comprehensively investigated. The study found that the nanocone-shaped Ni-plated samples exhibited superior performance. Absorption loss was dominant when a relatively low amount of Ni-plated carbon fiber was added, while reflection loss dominated when a relatively high amount was added. Adding 0.3 g of nanocone-shaped Ni carbon fiber created a 1.2 mm thin film with a shielding effectiveness of 71 dB and a tensile strength of 22.4 MPa. Additionally, the thin film demonstrated excellent flexibility and durability. Due to its exceptional mechanical properties and flexibility, this composite film holds significant potential in the fields of microelectronics and intelligent electronic devices.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Xiaocan Wang,Zhangtang Jiang,Yichang Ma,Xiangyu Su,Xikang Zhao,Aimei Zhu,Qiugen Zhang
Anion exchange membrane water electrolysis (AEMWE) is a feasible pathway to industrial-scale production of hydrogen due to the use of low cost, non-precious metal catalysts . In this study, we demonstrate a stable NiFe 2 O 4 anodic oxygen evolution reaction (OER) catalyst to achieve durable and efficient AEMWE via a simple strategy combining hydrothermal and thermal reduction reactions. The prepared NiFe 2 O 4 -50 catalyst, with polyhedral-sphere hybrid morphology and abundant oxygen vacancies , exhibits an overpotential of 280 mV at 50 mA cm −2 and a Tafel slope of only 44.6 mV dec −1 for OER. Moreover, its use as oxygen evolution electrode in AEMWE cell assembled with a Pt/C cathode show excellent water electrolysis performance with a current density of high to 4 A cm −2 at 1.89 V, a cell voltage of only 1.64 V at 1 A cm −2 , as well as good long-term stability over >1000 h of continuous water electrolysis under a current density of 1 A cm −2 . The newly developed NiFe 2 O 4 catalyst demonstrates excellent AEMWE performance and has a potential application for practical large-scale hydrogen production .
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ACS ES&T Water
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2023
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IF 5.3
Ming Liu,Hua Zou,Penghui Shao,Hao Jia,Guoshuai Liu
The presence of metals and complexing agents in wastewater poses serious threats to public health and aquatic ecosystems. Electrochemically advanced oxidation processes can break down heavy metal compounds, but recovering these metals at the cathode presents challenges. To address this concern, we explore amidoxime, known for its high complexation capacity and hydrophilicity, as a cathodic microenvironment modifier to enhance heavy metal adsorption and immobilization. We develop a novel carbon felt (CF) amidoxime-functionalized group (CFAG) cathode for cathodic nickel recovery from Ni–EDTA. Experimental results show a significant improvement in nickel recovery efficiency with amidoxime functionalization. Specifically, CFAG outperforms CF by 2 times, driven by nickel recovery reaction kinetic constants of 0.0202 min–1 for CFAG and 0.0101 min–1 for CF. Furthermore, cycling and desorption experimental results have validated the enduring stability and regenerative attributes of the CFAG electrode, and the density functional theory calculations confirm that nickel binds more effectively to amidoxime groups than conventional polymer groups on CF. This study presents a promising electrochemical approach for recycling metals in complex heavy metal wastewater, making metal resource recovery more economical and efficient.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Heng Luo,Hira Rehman,Xinyu Xia,Jinfei Zheng,Ping Li,Yang Li,Jinchao Tong
The development of wide-band microwave absorbing materials based on carbonaceous fillers remains a great challenge. In this study, carbon nanotubes (CNT) assembled coronal hollow clusters with efficient microwave absorbing performance have been obtained through successive hydrothermal and calcination process. Microstructural analysis reveals the distinct features of multiple assembly structures in the fabricated materials. The electromagnetic responses of Ni/CNT assembled clusters were examined across a frequency range of 2–18 GHz. Results demonstrate that the microwave frequency dispersion of electromagnetic parameters and reflection loss of Ni/CNT clusters are strongly influenced by weight loading. Multi-absorbing peaks with reflection loss better than − 40 dB could be achieved, while the equivalent absorbing band for RL < −10 dB covers 3.2–18 GHz, which account for 92.5% of the whole evaluated frequency range, and 62.5% for condition of RL < −20 dB. Furthermore, intrinsic attenuation beyond thickness derived semi-wavelength resonant absorption makes a major contribution to this superior performance. The underlying mechanism of dielectric response was investigated through Cole-Cole analysis and finite element simulation. ‘Micro-dipoles’ relaxation and hopping relaxation originated from defects within CNT and barrier between CNT, while the high magnetic dissipation capability of Ni nanoparticles make a major contribution to overall absorbing performance. All these are beneficial to regulation and optimization of microwave absorption performance of novel Ni/ CNT functionalized multistage architecture.
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CHEMICAL PHYSICS LETTERS
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2023
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IF 2.8
Xiran Qin,He Ding
The development of new, efficient, and low-cost OER electrocatalysts with advanced structures is of great significance for hydrogen production by electrolysis of water. A Ni-doped ferrous oxalate nanorod electrocatalyst (Ni-FeC 2 O 4 ) was synthesized using a one-step solvothermal method, which showed an outstanding OER activity with a low overpotential of 296 mV at 10 mA cm −2 . The Ni-FeC 2 O 4 electrocatalyst exhibited excellent OER stability in the 300 mV constant potential test, which was mainly attributed to the fact that Ni doping can increase the electrochemical active surface areas and the interfacial charge transfer abilities of the FeC 2 O 4 electrocatalyst, optimize the electronic structure of the real active species ferric hydroxide, promote the formation of the decisive step *OOH of ferric hydroxide, and improve its intrinsic activity.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 15
·2897-2904
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IF 3.545
Beixi An,Yibing Luo,Jinglong Bai,Yanrong Wang,Xu Cheng,Jianpeng Li,Qiao Wang,Yifan Yang,Erqing Xie
In this study, we used a hydrothermal method to prepare WO3 nanospheres doped with a bimetal of Pd and Ni and used them in hydrogen sensing. The results show that the bimetal-doped WO3 nanospheres have a higher response, faster response/recovery time, and better selectivity than single metal-doped WO3. Moreover, they still have a high response to hydrogen at a low concentration. With 5 ppb of hydrogen, the sensor's response can reach 1.5, which is 1.5 times greater than that of pure WO3. Furthermore, the bimetal-doped WO3 has a shorter response time (14 s) and recovery time (8 s). This superior performance of the Pd/Ni-doped WO3 to hydrogen is most probably because of the strong adsorption of hydrogen, which results from the synergistic effect of two metals.
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Molecular Catalysis
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2021
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IF 5.062
Rui Tang,Niamat Ullah,Yajun Hui,Xin Li,Zhenhua Li
Carbon dioxide hydrogenation for value-added chemicals has been regarded as a promising way for CO 2 utilization. This paper describes the preparation of Ni/CeO 2 catalysts derived from Ce-MOF precursor by impregnation or one-pot method and their application in carbon dioxide methanation. Various techniques were employed to characterize the prepared catalysts, including N 2 adsorption–desorption, X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (SEM), H 2 -temperature programmed reduction (H 2 -TPR), H 2 -temperature programmed desorption (H 2 -TPD) and CO 2 -temperature programmed desorption (CO 2 -TPD). The results showed that compared with commercial CeO 2 and CeO 2 prepared by precipitation, CeO 2 derived from Ce-MOF exhibited more oxygen vacancies and lower temperature reducibility, making it more beneficial for the adsorption and activation of CO 2 . Consequently, nickel supported on rod-shaped CeO 2 derived from Ce-MOF exhibited higher CO 2 conversion and methane selectivity at low temperatures. Furthermore, the Ni/CeO 2 −M-1 catalysts prepared by one-pot method showed superior activity since nickel could be partially incorporated into ceria lattice, leading to the formation of Ce 1-x Ni x O 2-y solid solutions and oxygen vacancies. The effect of nickel loading on the properties of the catalysts by one-pot method was also investigated, and the optimum Ni loading was 15 wt.% owing to the maximum number of oxygen vacancies being reached.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Gaopan Liu,Ningbo Xu,Yue Zou,Ke Zhou,Xuerui Yang,Tianpeng Jiao,Wu Yang,Yong Yang,Jianming Zheng
Ni-rich layered structure materials are appealing cathodes for high-energy-density lithium-ion batteries developed for electric vehicles, drones, power tools, etc. However, poor interfacial stability between a Ni-rich cathode and carbonate electrolyte, especially at high temperatures, and fast capacity fading still hinder their mass market penetration. Here, we investigate cyclopentyl isocyanate (CPI) with a single isocyanate (−NCO) functional group as a bifunctional electrolyte additive for the first time to improve the interfacial stability of Ni-rich cathode LiNi0.83Co0.12Mn0.05O2 (NCM83). With an electrolyte containing 2 wt % CPI, the NCM83 cathode shows capacity retention of up to 92.3% after 200 cycles at 1C and 30 °C, much higher than that with the standard electrolyte (78.6%). It is demonstrated that the −NCO of CPI could largely inhibit the thermal decomposition of LiPF6 salt and scavenge water and hydrogen fluoride (HF) species, improving electrolyte stability. More importantly, the additive CPI could be preferentially oxidized, forming a stabilized and protective cathode electrolyte interphase (CEI) layer on the surface of NCM83, which effectively suppresses the parasitic side reactions and maintains the superior interfacial charge-transfer and lithium-ion diffusion kinetics. Both functions enable a significant improvement in electrochemical performance at both 30 and 60 °C.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Jia Deng,Xiang Zhan,Feng Wu,Shuxian Gao,Li-Zhi Huang
Trichloroethylene (TCE), one of the most frequently detected chlorinated organic pollutants (COPs) in groundwater, has potential risks to human health. The bimetallic system consisting of zero-valent iron (ZVI) and a second catalytic metal has been widely investigated for reductive dechlorination of COPs. However, the passivation layer of ZVI inhibits the electron transfer causing a low dechlorination efficiency. In this work, we designed a novel bimetallic system using Fe(OH) 2 and Ni for fast dechlorination of TCE. The reduction efficiency of TCE reaches 94.8 % after 5 h of reaction in the Fe(OH) 2 /Ni system. TCE was completely dechlorinated to nontoxic gas products including ethylene and ethane, which was attributed to the generation of active hydrogen species (H*) in the system. The Ni 2+ cations undergo the process of hydroxylation and olation. Subsequently, electrons of Fe(OH) 2 were transferred to Ni(II) causing the formation of Ni(0). The catalytic Ni(0) sites generate H* for TCE dechlorination via catalytic reduction of H 2 O/H + . A part of Fe(II) in the Fe hydroxide layer of Fe(OH) 2 was oxidized to Fe(III) leading to the formation of green rust with a hexagonal structure. Our work demonstrates Fe(OH) 2 /Ni is a promising composite material for the remediation of TCE-contaminated groundwater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yi Yang,Jing Zhang,Yue Wei Li,Qian Shan,Wei Wu
A glassy carbon electrode modified by composite material consisting of molybdenum disulfide nanosheets and nickel nanosheets (Ni/MoS 2 electrode) was prepared for electrochemical detection of nitrite. Ni/MoS 2 was characterized by energy dispersive X-ray spectroscopy, scanning electron microscopy, Raman spectroscopy and X-ray diffraction. Most of MoS 2 nanosheets had lateral dimensions less than 150 nm, and the nickel nanosheets were slightly smaller, which were covered on the surface of MoS 2 nanosheets evenly. The electrochemical method was used to characterize and study the electrochemical behaviors of Ni/MoS 2 and its responses to nitrite. Under the optimized conditions, the prepared Ni/MoS 2 electrode showed good detection performances and stability, with a detection range of 5–800 μM, and a detection limit of 2.48 μM (S/N = 3). In addition, by detecting nitrite in tap water, the practical applicability of the electrochemical sensor was verified.
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Molecular Catalysis
·
2020
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IF 3.687
Shilin Nie,Huafan Li,Jingru Qin,Yansu Wang,Libo Niu,Ligong Chen,Guoyi Bai
Several Ni/Montmorillonite (MMT) catalysts were prepared and evaluated in the hydrogenation of dioctyl phthalate to di(2-ethylhexyl) hexahydro-phthalate, an environmentally friendly plasticizer. Notably, a Ni/MMT-AE catalyst, which was prepared by the ammonia evaporation method, showed excellent activity and stability. It could be steadily used ten times under harsh reaction conditions, comparable to most of the noble metal catalysts. TEM results revealed that the active nickel species were highly dispersed on the surface of the MMT support with average particle sizes of 4.1 nm in the Ni/MMT-AE catalyst, resulting in its high activity. XPS and TPR results demonstrated the strong interaction between nickel and the MMT support, which could effectively inhibit the agglomeration and loss of the active nickel species during the reaction, accounting for its outstanding stability.
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CHINESE JOURNAL OF CHEMISTRY
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2020
·Vol. 38
·期 5
·439-444
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IF 3.826
Bin Zhang,Bin Chen,Mark Douthwaite,Lipeng Tang,Yibo Zhang,Meng Wang,Ding Ma
Summary of main observation and conclusion A dual-templating method was used to synthesize a series of hierarchical carbon supports containing different proportions of spherical macropores ( ca. 200 nm in diameter) and mesoporous channels ( ca. 4 nm in diameter). These and some other conventional carbon materials were subsequently impregnated with Ni and tested for the conversion of glycerol. The hierarchical catalysts exhibited a significantly higher conversion (96%) and selectivity (77%) to 1,2-propanediol, and the specificity selectivity coefficient (6.1) towards 1,2-propanediol against lactic acid was three times higher than that observed over a conventional Ni/C micro catalyst (2.1). The enhanced performance of these materials, compared with the Ni nanoparticles supported on conventional carbon supports, was attributed to their high surface areas (> 1110 m 2 ∙g −1 ) and large pore volumes ( ca . 0.4 cm 3 ∙g −1 ) permitting greater accessibility of substrate and/or intermediates to Ni active sites. Given that the concentration of accessible Ni sites in these materials is higher, a competitive benzilic-acid-rearrangement reaction to produce lactic acid was suppressed, leading to an enhanced hydrogenation selectivity to 1,2-propanediol. This study evidences the potential benefits, which can be established from utilizing hierarchical support materials in the valorization of biomass.
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