RSC Advances
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2022
·Vol. 12
·期 45
·29177-29186
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IF 4.036
Zhao Qin,Yanqin Xu,Lin Liu,Min Liu,Hanjun Zhou,Liyue Xiao,Yuan Cao,Changguo Chen
Electrodes for supercapacitors made from metal–organic frameworks (MOFs) are still hindered by electron transfer properties. Therefore, an electrode composite material Ni-MOF@PPy was synthesized from a Ni-based metal–organic framework (Ni-MOF) doped with poly-pyrrole (PPy) using a simple chemical oxidation method to improve its electron transfer property. After introducing the electrochemically active substance K4Fe(CN)6 into the electrolyte, the composite material had a specific capacitance of 1815.4 F g−1 at a current density of 1 A g−1. Ni-MOF@PPy and active carbon (AC) as the positive and negative electrodes have been used, respectively, to assemble asymmetric supercapacitors (ASCs) in the KOH and K4Fe(CN)6 mixed electrolyte. This novel Ni-MOF@PPy//AC ASC energy storage device can provide 38.5 W h kg−1 energy density, 7001 W kg−1 power density, and 90.2% capacitance retention after 3000 cycles. Therefore, Ni-MOF@PPy//AC ASC is an excellent energy storage device with practical and economic value. The synergistic effect strategy proposed in this work can be easily applied to develop other MOFs with unique crystal structures as well as other redox active additives, providing new avenues and research ideas for exploring novel energy storage devices.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xingang Luan,Qinghua Zhao,Shaomin Gu,Xichao Dong,Laifei Cheng,Ralf Riedel
Wireless passive sensors based on surface acoustic wave (SAW) provide a good solution for the measurement demand under high temperature and harsh conditions. SiBCN ceramics have excellent mechanical properties at high temperature and semiconductor behavior, making them potential for electrode of SAW sensors. To achieve the target conductivity, a series of SiBCN and SiNiBCN coatings are prepared by polymer derived ceramics (PDC) method and the influence of microstructure on the conductivity of the coatings is discussed. The results show that the conductivity of the SiBCN coatings is affected by both the content of free carbon and the degree of graphitization. The introduction of Ni leads to the formation of Ni 2 Si conductive microcrystals at lower temperatures and catalyzes the graphitization of the carbon phase, so that the SiNiBCN coatings show lower electrical resistivity. The amount of the metal conductive phase and the graphitization degree of the carbon phase increase with the pyrolysis temperature, resulting in decrease of the SiNiBCN coatings resistivity.
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Nanoscale
·
2018
·Vol. 11
·期 3
·1058-1064
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IF 7.233
Yu Ding,Ying Li,Yuanyuan Xue,Boqiang Miao,Shuni Li,Yucheng Jiang,Xien Liu,Yu Chen
Atomically thick ultrathin nanomeshes (NMs) possessing the inherent advantages of both two-dimensional nanomaterials and porous nanomaterials are attracting increasing interest in catalysis and electrocatalysis. Herein, we report a direct chemical synthesis of atomically thick Ni(OH)2-NMs by a NaBH4 assisted cyanogel hydrolysis method, which overcomes the shortcoming of the post-etching method for NM synthesis. Various physical characterization methods show that the as-synthesized Ni(OH)2-NMs have 1.7 nm thickness, a big surface area, abundant nanoholes, and numerous surface/edge atoms with low-coordination numbers. The as-synthesized Ni(OH)2-NMs show a better electrocatalytic performance for the urea oxidation reaction than conventional Ni(OH)2 nanoparticles without holes in the alkaline electrolyte, including a lower onset oxidation potential, faster reaction kinetics, and higher mass activity.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhihao Liu,Yachao Li,Kangzhou Wang,Yan Li,Yurong He,Jie Liang,Jianli Zhang,Tian-sheng Zhao,Noritatsu Tsubaki,Xinhua Gao
The design and preparation of highly active and stable Ni-based catalysts has attracted extensive attention. In this study, a series of embedded Ni@C catalysts were synthesized by a facile sol-gel method. After reduction at 400 °C, the optimized Ni@C-400 catalyst showed excellent performance in CO 2 methanation at a low temperature of 300 °C, with a CO 2 conversion of 74.3 % and good stability for 70 h. The characterization results indicated that after reduction treatment, the carbon species in the precursor were transformed into graphite carbon with more disorder defects. This structure facilitated the anchoring effect of the nickel components in the Ni@C catalyst, thereby forming a distinctive embedded structure that ensured the preservation of the nickel active phase in the catalyst following prolonged reaction. Therefore, the Ni@C catalyst prevented severe sintering and loss of loaded nickel. In addition, the interaction between Ni and C facilitated charge transfer, enhancing the CO 2 activation.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Jiajia Zheng,Zhihui Li,Jiayue Zheng,Han Chencheng,Yiming Chen,Zhiyi Wu
Designing an absorber to mitigate the electromagnetic radiation pollution caused by the rapid development of radio technology with multiple characteristics, including high reflection loss (RL), broad absorption bandwidth, thinness, and low filling ratio, is crucial but challenging. This work prepared three-dimensional heterogeneous MXene/Ni composites by using an electrostatic self-assembly method. Due to the synergistic effect of dielectric loss, magnetic loss, and the unique heterogeneous structure, the obtained multilayer MXene/Ni composites, with a low filling ratio of 15 wt % and a thickness of only 1.5 mm, achieved an astonishing minimum RL value of −79.6 dB and an effective absorption bandwidth (EAB) of 3.35 GHz. Furthermore, an ultrawide tunable EAB of 12.35 GHz could be obtained in the frequency range of 3.30–15.65 GHz by adjusting the matching thickness of the samples. This design of a heterogeneous interface structure provides a practical strategy to develop high-performance next-generation electromagnetic absorbers.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2011
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IF 4.057
Y.J. Chai,Z.Y. Liu,H.N. Gao,Z.Y. Zhao,N. Wang,D.L. Hou
A nanoporous Ni layer on the surface of Mg was prepared utilizing the reduction reaction of Ni 2+ by Mg in NiCl 2 .12H 2 O solution. XRD result showed that the product was composed of cubic Ni, hexagonal Mg and little Mg(OH) 2 . SEM and TEM results suggested that a nanoporous Ni layer microencapsulated Mg and formed Ni@Mg. The specific surface area of Ni@Mg formed in this reaction was 65.3 m 2 /g. Hydrogen uptake increased as the temperature increased. Moreover, Ni@Mg showed a reversible hydriding-dehydriding process without formation of the stable hydrides, which indicated that the nanoporous Ni layer on the surface of Mg showed an obvious physisorption characteristics rather than hydrogen storage behavior of Mg.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6325-6334
·
IF 12.732
Peng Zhou,Shuhua Wang,Guangyao Zhai,Xingshuai Lv,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Hefeng Cheng,Ying Dai,Baibiao Huang
Ni/TiO2 as a classic system has been widely studied in the traditional catalysis field including the water-gas shift reaction and selective oxidation/hydrogenation. However, in terms of the electrocatalytic hydrogen evolution reaction (HER), there is still a lack of systematic research on the actual synergistic promotion effect on the performance, and the influence of the host material on the electronic interaction between Ni and TiO2 is still unclear. Herein, we synthesized a series of Ni/TiO2 composites with different forms and tested the relevant HER performance. The results show that Ni/TiO2 exhibits much better HER performance than pure Ni and there is one type of electronic interaction between Ni and TiO2 in the composite with different forms, that is, electrons transfer from Ni to TiO2. However, the interaction strength is host dependent, and the composite with Ni as the host displays the strongest interaction, and therefore the best HER performance (46 mV at 10 mA cm−2).
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Wenhao Zhang,Liang shen,Longhao Xu,Fayang Zhou,Fengyin Sun,Jing Xu,Minghui Zhu
Hydrogenation of CO 2 to methane is a feasible solution to the growing global environmental and energy challenges. Nickel-based catalysts are efficient and cost effective for CO 2 methanation. Hernin, we synthesized Mn-promoted Ni/Al 2 O 3 catalysts with facilitated CO 2 methanation and elucidated the crucial role of Mn. After Mn doping, NiMn/Al 2 O 3 catalysts showed improved NiO dispersion. Subsequently, H 2 reduction and CO 2 methanation treatments resulted in reduction of NiO and MnO 2 into Ni and MnO, and incorporation of Ni 2+ into MnO lattice, forming NiMnO x and creating numerous Ni-NiMnO x interfaces. The abundant oxygen vacancies from NiMnO x could enhance CO 2 activation. Moreover, oxygen vacancies at the interface also promote electron transfer from Ni and MnO, leading to electron-poor Ni nanoparticles and thus significantly promoting the *CO methanation. Ultimately, the electron-poor Ni nanoparticles and abundant oxygen vacancies at the Ni-NiMnO x interface jointly facilitate CO 2 methanation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Mengjuan Wu,Yizhou Shen,Jie Wang,Xi Wang
Hydrophobic metallic coatings have garnered significant scientific and industrial interest due to their exceptional mechanical durability and extensive application potential. A critical yet not fully understood phenomenon associated with certain metallic surfaces is the spontaneous and reversible transition from an initial hydrophilic state to a hydrophobic state over time. This study aims to elucidate the physicochemical mechanisms underlying the time-dependent wettability transition. The Ni based alloy coating, characterized by an intricate, rough hierarchical structure, was successfully fabricated on 304 stainless steel (SS) substrates through electrodeposition. The temporal evolution of the coating's wetting behavior was systematically monitored, confirming a transition from hydrophilicity to hydrophobicity following aging in ambient air. To disentangle the underlying factors contributing to this phenomenon, plasma cleaning was employed to systematically remove adsorbed airborne hydrocarbons from the coating surface. Comparative X-ray photoelectron spectroscopy (XPS) analysis of the surfaces before and after plasma treatment revealed a substantial reduction in the atomic ratio of airborne hydrocarbon groups (from 79.2 % to 62.7 %), accompanied by a notable increase in lattice oxygen content. These findings demonstrate that the observed wettability transition is a multifaceted process arising from synergistic effects involving both physical adsorption of environmental hydrocarbons and concurrent chemical changes occurring on the coating surface. The interaction between adsorbed hydrocarbon molecules and lattice oxygen has been identified as a key driver for the gradual evolution of surface wettability. Collectively, these insights enhance the understanding of dynamic interfacial behaviors exhibited by metallic coatings and establish a fundamental theoretical framework for rational design and optimization of stable hydrophobic metallic surfaces.
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Journal of Physical Chemistry C
·
2019
·
IF 4.309
Wen Wu,Ying Li,Limin Liang,Qiuyan Hao,Jun Zhang,Hui Liu,Caichi Liu
Antimony selenide (Sb2Se3) semiconductor with a narrow band gap is regarded as an ideal candidate for the next-generation broadband photodetectors. However, the photodetectors based on the binary Sb2Se3 semiconductor suffer from low responsivity (Rλ) and external quantum efficiency due to the intrinsic low electrical conductivity. To address the issue, we introduce a low-valence Ni cation (Ni2+) into the binary Sb2Se3 ((Sb1–xNix)2Se3) nanorods synthesized by a facile hot-injection process. With increasing Ni-doping concentration, the (Sb1–xNix)2Se3 nanorods exhibit a significant increase of electrical conductivity from 4.983 × 10–5 to 4.011 × 10–4 Ω–1 m–1. The photodetector based on (Sb0.995Ni0.005)2Se3 nanorod film exhibits an excellent responsivity of 18.9 mA/W under white light illumination of 45 mW/cm2 at an applied bias voltage of 3 V, which is an approximately 19-fold higher than that of the pristine Sb2Se3 nanorod photodetector. Moreover, the density functional theory calculation has demonstrated that the Ni2+ doped into Sb2Se3 will preferentially occupy the Sb site and introduce a shallow energy level of acceptor, resulting in the enhancement of electrical conductivity, which is consistent with the experimental result. Therefore, the work proves the substitution of Sb site with a low-valence metal cation into Sb2Se3 is an effective strategy to improve the performance of the Sb2Se3-based photodetector.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Fuguang Liu,Zhonghan Feng,Xinyue Zhang,Liang Cui,Jingquan Liu
The creation of inexpensive, high-performance catalysts to reduce the overpotential of the oxygen evolution reaction (OER) process is critical for the electrolysis of water for hydrogen production. Therefore, we applied a one-step hydrothermal method using cation exchange reaction (CER) to prepare Fe-doped and interfacial Ru nanoclusters co-engineered Ni(OH) 2 nanosheets directly grafted on Ni foam (Ru@Fe-Ni(OH) 2 /NF) for OER process. Results of electrochemical tests reveal that Ru@Fe-Ni(OH) 2 /NF has excellent OER activity, and its overpotential (η) is only 266.4 mV when the current density is 50 mA cm −2 in 1 M KOH solution, even lower than that of commercial OER catalyst RuO 2 (355 mV). The Tafel slope also decreases from 133.8 mV dec −1 for pristine Ni(OH) 2 /NF material to 24.1 mV dec −1 for Ru@Fe-Ni(OH) 2 /NF, indicating the higher charge transfer rates and fastest kinetics for water oxidation. At an overpotential of 300 mV the optimal turnover frequency (TOF) of 0.062 s −1 for Ru@Fe-Ni(OH) 2 /NF is achieved compared to that of Ni(OH) 2 /NF (0.014 s −1 , NN), demonstrating the fast reaction kinetics of the as-prepared electrocatcalyst. After 24 h stability test, the catalytic activity of Ru@Fe-Ni(OH) 2 /NF was only attenuated by 2 %, showing excellent OER stability and durability. Our results show that we have successfully developed an efficient OER catalyst for green and efficient electrocatalytic hydrolysis to produce H 2 and O 2 , providing a promising method for clean H 2 production.
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FUEL
·
2022
·
IF 8.035
Jun Liu,Yu Zhang,Zhoujie Liang,Guojie Zhang,Ying Wang,Yuqing Zhao,Guoqiang Li,Yongkang Lv
In this paper, a series of bimetallic catalysts with different Ni/Co ratios were prepared by co-impregnation method for application in methane dry reforming reaction. The effects of different Ni/Co ratios on the catalyst performance were investigated. The catalysts were characterized by XRD, BET, H 2 -TPR, TG, TEM and FTIR. The results showed that after the introduction of a certain amount of Co, the synergistic effect between Ni and Co enhanced the active component-carrier interaction, thus improving the dispersion of the active component of the catalyst, reducing the particle size of the metal, and increasing the activity of the catalyst. Meanwhile, the mechanistic study showed that the introduction of Co species with strong oxygen affinity facilitated the formation of oxygen vacancies. It makes the catalysts contain higher lattice oxygen and carbonate species, which was conducive to the elimination of carbon accumulation, thus improving the stability of catalysts. Therefore, the 10Ni-8Co-10Y/WC-AC catalyst exhibited excellent dry reforming of methane (DRM) performance at a Ni/Co ratio of 5:4. The conversions of CO 2 and CH 4 were 95 % and 88 % at 800 °C under atmospheric pressure, respectively.
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