CERAMICS INTERNATIONAL
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2019
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IF 3.45
Hengrui Qiu,Shengli An,Xuejiao Sun,Huimin Yang,Yongqiang Zhang,Wenxiu He
Due to the unconventional properties of MWCNTs-GONRs (multiwalled carbon nanotubes-graphene oxide nanoribbons), we have tried to use it as a carbon resource for supercapacitors . MWCNTs-GONRs/Ni(OH) 2 electrode was obtained by hydrothermal method . Velvet α-Ni(OH) 2 was prepared above NF (nickel-foam) loaded with MWCNTs-GONRs. This layered design can effectively promote the diffusion of ions and increase the active site for MWCNTs-GONRs/Ni(OH) 2 electrode, thus enhancing the electrochemical performance. The electrode exhibits extraordinary electrochemical performances in electrochemical testing, such as supernal specific capacitance (1713.2 F g −1 ) and prominent working time. In addition, supercapacitors was assembled with MWCNTs-GONRs/Ni(OH) 2 and active carbon as materials. Which represents a prominent energy density (41.23 Wh kg −1 ), high power (6.80 kW kg −1 ) and prominent cycling stability property (95.18%, 3000 times). The electrode prepared in this work provides a clue to enlighten people for energy storage.
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高影响因子
Journal of Environmental Sciences
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2016
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IF 2.208
Cancan Xu,Rui Liu,Lvjun Chen,Jialu Tang
Ni/Fe-Fe 3 O 4 nanocomposites were synthesized for dechlorination of 2,4-dichlorophenol (2,4-DCP). The effects of the Ni content in Ni/Fe-Fe 3 O 4 nanocomposites, solution pH, and common dissolved ions on the dechlorination efficiency were investigated, in addition to the reusability of the nanocomposites. The results showed that increasing content of Ni in Ni/Fe–Fe 3 O 4 nanocomposites, from 1 to 5 wt.%, greatly increased the dechlorination efficiency; the Ni/Fe–Fe 3 O 4 nanocomposites had much higher dechlorination efficiency than bare Ni/Fe nanoparticles . Ni content of 5 wt.% and initial pH below 6.0 was found to be the optimal conditions for the catalytic dechlorination of 2,4-DCP. Both 2,4-DCP and the intermediate product 2-chlorophenol (2-CP) were completely removed, and the concentration of the final product phenol was close to the theoretical phenol production from complete dechlorination of 20 mg/L of 2,4-DCP, after 3 hr reaction at initial pH value of 6.0, 3 g/L Ni/Fe-Fe 3 O 4 , 5 wt.% Ni content in the composite, and temperature of 22°C. 2,4-DCP dechlorination was enhanced by Cl − and inhibited by NO 3 − and SO 4 2 − . The nanocomposites were easily separated from the solution by an applied magnetic field. When the catalyst was reused, the removal efficiency of 2,4-DCP was almost 100% for the first seven uses, and gradually decreased to 75% in cycles 8–10. Therefore, the Ni/Fe–Fe 3 O 4 nanocomposites can be considered as a potentially effective tool for remediation of pollution by 2,4-DCP.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Xiaogang Guo,Xueming Li,Zhibo Wei,Xiaolin Li,Lidan Niu
Superhydrophobic tri-dimensional Ni/Al coatings (3DNACs) with great application value have been successfully fabricated via a simple two-step method combined with hydrogen bubble dynamic template and electrophoretic deposition technique after 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane treatment. The surface morphologies and chemical compositions were analyzed by FE-SEM, EDS, XRD, AFM and FT-IR in detail. The water contact angle of superhydrophobic 3DNACs surface was as high as 156 ± 2° (>150) much larger than that of unmodified samples. Moreover, the obtained samples exhibited great thermal properties and combustion performance. Thus, the superhydrophobic 3DNACs with prominent exothermic capability turn out to be a promising novel energy in field of mirco/nano energy materials for longer-term storage or transportation, especially in high humid environment.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Huan Chen,Ting Li,Fang Jiang,Zhe Wang
Catalytic reduction of N -nitrosodimethylamine (NDMA) was investigated over γ-Al 2 O 3 supported bimetallic Pd-Ni catalysts (3%(Pd x Ni 1−x )). NDMA could be reduced to dimethylamine over 3%(Pd 0.8 Ni 0.2 ) with a metal-loading-normalized pseudo-first-order rate constant of 836 ± 21 L g me −1 h −1 . Characterization results showed that the reducibility of PdO (or NiO) was improved by addition of Ni (or Pd) in 3%(Pd x Ni 1−x ); Pd-Ni ensembles were formed in 3%(Pd x Ni 1−x ) and there was an electronic transfer from Pd to Ni; metal dispersion was affected by the formation of Pd-Ni ensembles and a volcano curve of metal dispersion via Pd/Ni ratio was observed. The activity profiles demonstrated that TOF had a significant positive relationship with metal dispersion of 3%(Pd x Ni 1−x ), indicating high metal dispersion favor NDMA reduction. NDMA reduction over 3%(Pd 0.8 Ni 0.2 ) catalyst could be described by Langmuir-Hinshelwood model, reflecting an adsorption controlled reduction mechanism. The reduction mechanism of NDMA over 3%(Pd 0.8 Ni 0.2 ) catalyst was proposed to be that H 2 was activated by Pd, and H spillover from Pd to Ni/NiO reduced NDMA though N-N cleavage.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2016
·Vol. 46
·期 12
·1177-1186
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IF 2.223
Guo Jie,Hou Yongjiang,Li Bo,Wang Yaquan
Abstract The Ni–B-modified carbon paste electrodes were synthesized by the electroless deposition, followed by thermal treatment. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were performed to gather information about the morphology, crystallinity, and binding energy. The fabricated Ni–B/C electrodes are applied to methanol electrooxidation in alkaline media. The results show that Ni–B/C catalyst with a comparable amount of microcrystalline Ni and Ni 3 B, 59 and 41 wt%, displayed a significantly enhanced electrocatalytic activity, which is approximately three times the activity of the unheated Ni–B/C catalyst. The synergetic mechanism of methanol oxidation was proposed that involves one Ni 3 B site favor the adsorption and activation of the methanol molecule and one Ni site for oxidative mediation of methanol. In addition, the kinetic parameters of the reaction were calculated using linear sweep voltammetry. Graphical abstract The illustration of the speculated methanol oxidation mechanism.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 23
·9724-9731
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IF 3.5
Ying Peng,Shuo Chen,Zhengli Hu,Mengqi Yin,Lishun Pei,Qiaohua Wei,Zailai Xie
Developing novel electrocatalysts for achieving high selectivity and faradaic efficiency in the carbon dioxide reduction reaction (CO2RR) poses a major challenge. In this study, a catalyst featuring a nitrogen-doped carbon shell-coated Ni nanoparticle structure is designed for efficient carbon dioxide (CO2) electroreduction to carbon monoxide (CO). The optimal Ni@NC-1000 catalyst exhibits remarkable CO faradaic efficiency (FECO) values exceeding 90% across a broad potential range of −0.55 to −0.9 V (vs. RHE), and attains the maximum FECO of 95.6% at −0.75 V (vs. RHE) in 0.5 M NaHCO3. This catalyst exhibits sustained carbon dioxide electroreduction activity with negligible decay after continuous electrolysis for 20 h. More encouragingly, a substantial current density of 200.3 mA cm−2 is achieved in a flow cell at −0.9 V (vs. RHE), reaching an industrial-level current density. In situ Fourier transform infrared spectroscopy and theoretical calculations demonstrate that its excellent catalytic performance is attributed to highly active pyrrolic nitrogen sites, promoting CO2 activation and significantly reducing the energy barrier for generating *COOH. To a considerable extent, this work presents an effective strategy for developing high-efficiency catalysts for electrochemical CO2 reduction across a wide potential window.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-15
·
IF 14.7
Yao Zhibo,Cheng Hao,Xu Yifei,Zhan Xinyu,Hong Song,Tan Xinyi,Wu Tai-Sing,Xiong Pei,Soo Yun-Liang,Li Molly Meng-Jung,Hao Leiduan,Xu Liang,Robertson Alex W.,Xu Bingjun,Yang Ming,Sun Zhenyu
The electrocatalytic reduction of CO 2 to CO is slowed by the energy cost of the hydrogenation step that yields adsorbed *COOH intermediate. Here, we report a hydrogen radical (H•)-transfer mechanism that aids this hydrogenation step, enabled by constructing Ni-partnered hetero-diatomic pairs, and thereby greatly enhancing CO 2 -to-CO conversion kinetics. The partner metal to the Ni (denoted as M) catalyzes the Volmer step of the water/proton reduction to generate adsorbed *H, turning to H•, which reduces CO 2 to carboxyl radicals (•COOH). The Ni partner then subsequently adsorbs the •COOH in an exothermic reaction, negating the usual high energy-penalty for the electrochemical hydrogenation of CO 2 . Tuning the H adsorption strength of the M site (with Cd, Pt, or Pd) allows for the optimization of H• formation, culminating in a markedly improved CO 2 reduction rate toward CO production, offering 97.1% faradaic efficiency (FE) in aqueous electrolyte and up to 100.0% FE in an ionic liquid solution.
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高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Xi-ya Shan,Xing-hai Zhou,Wen-qi Cui,Min-yu Li,Yuan-lin Yan,Yong-fang Qian,Yuan Gao,Shang-ru Zhai,Li-hua Lyu,Hong-zhu Liu,Zhong-gang Wang
Ingenious microstructure design and suitable component regulation are the prevailing methods to meet the requirements of lightweight, broadband, and high-efficiency electromagnetic absorbing materials. Herein, petal-like magnetic Ni nanosheets on porous carbon nanofibers (Ni-PCF) are synthesized by electro-blown spinning, hydrothermal reaction, and high-temperature calcination. The construction of a porous carbon fiber skeleton originated from the in situ composition of the pore-forming agent (polystyrene (PS)), and the formation of petal-like magnetic Ni nanosheets was derived from self-assembling during a hydrothermal reaction. The porous carbon fiber skeleton and petal-like Ni nanosheets could not only generate multiple reflections to extend the transmission pathway but also induce a synergistic effect of magnetic loss and dielectric loss to promote impedance matching, giving rise to more electromagnetic wave attenuation and energy dissipation. The good impedance matching, multiple reflections, and synergetic electric/magnetic losses originating from ingenious microstructures and suitable multicomponents resulted in the best microwave absorption performance of Ni-PCF2 with a minimum reflection loss (RLmin) value of 37.93 dB at 6.08 GHz and an effective absorption bandwidth (EAB) of 4.43 GHz.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shujie Liang,Jiaxin Lv,Yishun Wang,Hong Deng
The development of efficient and stable single-atom catalysts (SACs) for CO 2 photoreduction is a persistent challenge. This study reports the successful preparation of SACs by incorporating isolated Ni atoms into carbon nanorods through a low-temperature calcination process using nickel bis(dimethylglyoximate) complexes. These Ni atoms, maintaining their original coordination environments, can facilitate charge separation, and enhance CO 2 adsorption and activation. The optimized catalyst exhibits a CO formation yield of 24.4 µmol with ∼96 % selectivity in high-purity CO 2 , outperforming both the precursor and pure carbon. Additionally, the Ni SACs showed strong catalytic selectivity in diluted CO 2 conditions, with selectivity rates of 82.57 %, 80.35 %, and 61 % at 0.1, 0.05, and 0.01 atm, respectively. This work provides critical insights for designing efficient visible light-responsive CO 2 photoreduction catalysts at the atomic level.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Chengming Long,Sirui Liu,Di Wang,Zhaoqi Lu,Qiulan Zhang,Qiong Gao,Mingyi Zhang,Xinzhi Ma
Photoelectrochemical hydrogen production technology holds promise for directly and swiftly generating green hydrogen, which is pivotal for human welfare; however, it faces challenges posed by the energetically sluggish oxygen evolution reaction (OER). Cobalt-based nitrides are considered excellent photoelectrochemically active in the OER (PEOER) catalysts, and their conductivity and photoconversion efficiency remain relatively low. This paper presents the fabrication of Ni-alloyed Co4N nanowire arrays on carbon cloth ((Co1–xNix)4N NWAs/CC) as PEOER catalysts. By analyzing advanced in situ Raman and X-ray photoelectron spectroscopy (XPS) results, we discovered that Ni not only enhances the conductivity of the catalyst but, more importantly, also creates more photoexcited Co2+ OER centers and favors its reconstruction to CoOOH to charge PEOER. Furthermore, nitrogen plays a critical role in transforming pyridinic nitrogen into other forms of nitrogen to stabilize the catalyst’s structure. These advantages endow (Co0.74Ni0.26)4N NWAs/CC with remarkable PEOER enhancement (988%), which drives the standard current density of 10 mA cm–2 with only a 283 mV overpotential along with good durability. This research provides insights into the PEOER mechanisms of cobalt-based transition metal nitrides, providing a way for designing next-generation PEOER catalysts.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Mohit Kumar,Bhimanaboina Ramulu,Jae Su Yu
To produce clean and green hydrogen energy from electrolytic water, better electrocatalytic materials need to be developed. Herein, we reported the development of a Ti3C2 MXene@Ni/Co sulfide hybrid material for the use in hydrogen evolution reaction (HER) process, which is effective and stable. The shape of metal sulfide and its interactions with Ti3C2 MXene caused electronic coupling. This increased both the exposed metal sulfide's active edge sites and the charge-transfer speed. When compared with pure MXene and Ti3C2 MXene@NiS nanostructure, Ti3C2 MXene@Co4S3 exhibited outstanding electrocatalytic activity and stability in the HER process. The unique properties of the skeletal structure and the robust interface interaction between Co4S3 and MXene are responsible for the superior performance of Ti3C2 MXene@Co4S3 in the HER process. Our research offers a practical method to synthesize specialized nanostructures for electrocatalysis, electronics, and other applications.
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ENERGY
·
2018
·
IF 4.968
Lin Li,Dawei Tang,Yongchen Song,Bo Jiang,Qian Zhang
In this work, a ceria promoted Ni-based catalyst supported in mesoporous montmorillonite (MMT) was developed and evaluated in ethanol steam reforming . This Ni-Ce/MMT catalyst was synthesized by an ultrasound assisted cation exchange impregnation method and characterized by X-ray diffraction, N 2 adsorption–desorption, H 2 temperature-programmed reduction and transmission electron microscopy. TEM images of Ni-Ce/MMT presented that narrow Ni nanoparticles (av. 6.0 nm) were uniformly deposited within the mesoporous MMT support. This was attributed to the strong interaction between Ni and ceria and the confinement effect from the framework of MMT support. The catalytic activity and stability of Ni-Ce/MMT were studied in steam ethanol reforming and compared with Ni/MMT. The higher ethanol conversion and H 2 selectivity of Ni-Ce/MMT demonstrated the addition of ceria facilities the reaction of ethanol steam reforming. Additionally, the ethanol conversion was much more stable on Ni-Ce/MMT than on Ni/MMT during a long-term ethanol steam reforming reaction, illustrating that the catalyst deactivation was preferably suppressed with the help of ceria. In short, the Ni-Ce/MMT is a promising catalyst for ethanol steam reforming owing to the remarkable effect of ceria as well as the confinement effect of MMT support which can effectively suppress the Ni sintering and carbon deposition .
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