IONICS
·
2019
·Vol. 26
·期 1
·449-456
·
IF 2.289
Zheng Li,Zhang Wen,Guo Jun
A modified electrode Ni(II)–ARS/GR/CPE has been fabricated by electrodepositing nickel(II)–alizarin red complex on the surface of graphene-modified carbon paste electrode (GR/CPE) in alkaline solution. The modified electrode is characterized by scanning electron microscopy, Fourier transform infrared spectrometry, x-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. It exhibits the characteristic of improved reversibility and enhanced current responses of the Ni(III)/Ni(II) couple compared with Ni(II)–ARS/CPE. It also shows enhanced electrocatalytic activity toward the oxidation of formamide, which is due to the high surface area and facile charge–transfer ability of graphene and Ni(II)–ARS complex. The mechanisms of film formation and the catalytic process are also discussed. Moreover, the catalytic currents present linear dependence on the concentration of formamide from 0.5 mM to 0.21 M by amperometry; the detection limit is 0.15 mM. The modified electrode for formamide determination is of the property of simple preparation, good stability, fast response, and acceptable sensitivity.
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Materials
·
2024
·Vol. 17
·期 5
·1200
·
IF 3.1
Wei Tong,Weiqiang Wang,Xiayu Leng,Jianli Song
To enhance the comprehensive performance of solid oxide fuel cells (SOFCs) ferritic stainless steel (FSS) interconnectors, a novel approach involving composite electrodeposition and thermal conversion is proposed to prepare Ni-doped Co-Mn composite spinel protective coatings on FSS surfaces. The process involves the composite electrodeposition of a Ni-doped Co-Mn precursor coating, followed by thermal conversion to obtain the Co-Mn-Ni composite spinel coating. Crofer 22H was used as the substrate and orthogonal experiments were designed to investigate the influences of deposition solution pH, stirring rate, cathode current density, and the element content of Mn and Ni on the surface morphology and properties of the composite coatings, respectively. The characterization of the prepared coatings was conducted through macroscopic and microscopic morphology observations of the component surface, energy dispersive spectroscopy (EDS) analysis, and area specific resistance (ASR) testing, etc. Finally, the optimized composite electrodeposition parameters and the Mn-Ni content ratio in the solution were obtained. Experimental results indicated that the composite spinel coating prepared with the optimized process parameters exhibited excellent adhesion to the substrate, and the diffusion and migration of Cr element has been effectively inhibited. Compared with the substrate, the ASR of the coated components has also been decreased simultaneously, which provided an effective method for the surface modification of SOFC FSS interconnectors.
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PubMed
高影响因子
Petroleum Science
·
2022
·
IF 4.757
Wei-Long Zhan,Yu-Chao Lyu,Xin-Mei Liu,Lei Fan,Fu-Rang Li,Ye Yang
The Ni/SAPO-11 catalyst used for n-hexane hydroisomerization was prepared via a novel two-step crystallization strategy. It involves introduction of nickel salt into the pre-crystalized system of SAPO-11 by grinding followed by a second crystallization step. No extra solvent is introduced during the whole synthesis procedure which reduces waste liquid emissions significantly. More importantly, interaction between nickel and support is effectively regulated by the novel method to achieve a well dispersed nickel species and inhibit formation of inert nickel spinel simultaneously. Chemical environments of framework Si are tuned to enhance surface acidity of the Ni/SAPO-11 catalyst. It also shows smaller particle size which favors fast diffusion of reactants and products. Insights into the two-step crystallization indicate that accumulation of SAPO-11 precursors in the pre-crystallization stage, pH regulation by nickel salt and structural directing effect of Ni 2+ during the second crystallization period account for the rapid crystal growth and smaller particle size of the Ni/SAPO-11 catalyst. All the unique features endow the Ni/SAPO-11 catalyst higher activity and isomers selectivity than the Pt/SAPO-11 catalyst in n-hexane hydroisomerization.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Runbo Gu,Zhihui Feng,Tianyi Chen,Shusen Peng,Yongcun Ma
Nickel electroplating is a critical surface treatment technology that provides essential corrosion protection and ensures high electrical conductivity, both vital for maintaining the structural integrity and operational safety of modern metal components. However, inherent micropores within the plated layer can compromise its protective function and accelerate substrate corrosion. In this study, we present a novel, environmentally friendly, chromium-free sealing strategy based on an aminotrimethylene phosphonic acid (ATMP)-Zn²⁺ system, synergistically enhanced with benzotriazole (BTA). The specially formulated sealing bath selectively reacts with substrate exposed at pore bottoms while remaining inert to the sound nickel surface, allowing targeted pore filling through strong –PO(OH)₂–metal interactions. The resulting coating significantly reduces porosity (from 13.3 ± 1.6 cm⁻² to 1.7 ± 0.9 cm⁻²), maintains excellent electrical conductivity, and endures 2 h of neutral salt spray without corrosion. XPS and FTIR analyses confirm BTA’s synergistic role via N-H⁺···⁻O-P bonds and the optimized P-O-M coordination. This environmentally friendly approach offers a high-performance sealing solution that preserves the functional properties of Ni electroplating layers.
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高影响因子
FUEL
·
2025
·
IF 7.5
Ziwen Hao,Yabin Li,Yutong Pan,Xiaoyu Han,Qiang Wang,Maoshuai Li,Yue Wang,Xinbin Ma
Interaction between metal species and support affects the structural and electronic properties of metal species, thus changing the catalytic behaviour. This work demonstrates regulation of support size is an effective way to optimise the metal-support interaction over Ni/CeO 2 -cube. Smaller ceria cubes promoted formation of smaller Ni particle sizes with higher dispersion, generating stronger interaction between Ni and CeO 2 , and consequently higher turnover frequency for CO 2 methanation. The interaction in Ni/CeO 2 with the smallest ceria size (average ca. 5 nm) provides stronger CO 2 and H 2 adsorption capacity, facilitating the CO 2 methanation with over 99 % CH 4 selectivity at 548–573 K, delivering a CO 2 conversion rate of 327.9 mol CO2 mol Ni -1 h −1 , which is 1.9 and 14.0 times than that of the 12 nm and 20 nm counterparts at 573 K, respectively. In-situ FTIR spectroscopic analysis demonstrates the surface reaction proceeds via a formate pathway, and smaller CeO 2 -cube supported Ni facilitates conversion of carbonate/bicarbonate intermediates to formate species. The metal-support interaction aroused from controlled support size provides a new way to design high-performance methanation catalyst.
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高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Jianhui Liu,Ruizhe Li,Yuan Li,Lina Guo,Zhengyang Xue,Hong Yuan,Shuxin Ouyang
The crystal phase of titanium dioxide (TiO2) has a significant influence on the physicochemical properties and catalytic activities of supported metal catalysts. Herein, we synthesized two catalysts consisting of metallic nickel dispersed on anatase- and rutile-phase TiO2 (a-TiO2 and r-TiO2) supports with a simple impregnation-reduction method and assessed their photothermocatalytic activity for CO hydrogenation. The Ni-loaded r-TiO2 (Ni-r-TiO2) catalyst achieved a CO conversion of 23.3% at a photothermal temperature of 180 °C, which was 5.7 times that of the Ni-loaded a-TiO2 (Ni-a-TiO2) catalyst; meanwhile, the Ni-r-TiO2 catalyst achieved an increased C2+ hydrocarbon selectivity of 73.0% compared with that of the Ni-a-TiO2 catalyst (50.1%). CO-temperature-programmed desorption (CO-TPD), CO pulse experiments, and apparent activation energies of CO revealed the improved CO adsorption and activation abilities of the Ni-r-TiO2 catalyst. In situ diffuse reflectance infrared Fourier transform spectra (in situ DRIFTS) disclosed that the Ni-r-TiO2 catalyst followed direct CO dissociation, which led to the formation of more CH2* intermediates, subsequently yielding C2+ hydrocarbons. This work provides insights into the support design for the preferential formation of value-added chemicals.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bingchen Li,Zexiong Cui,Yufeng Tao,Jin Xiong,Jinbo Gao,Lihua Liu,Shiwei Song,Pengfei Tian
The slow kinetics of the cathodic hydrogen evolution reaction (HER) present a significant obstacle for alkaline water electrolysis. Consequently, developing non-precious metal HER catalysts with high activity and stability remains a challenge. This study reports a heterostructure catalyst composed of Mo-doped amorphous Ni(OH) 2 nanosheets modified Fe 3 O 4 crystal nanoparticles (Mo-NiOH@Fe 3 O 4 ). This unique structure exhibits a three-dimensional, coral-like structure, which significantly increases the electrochemically active surface area and exposes more active sites to the electrolyte. The incorporation of Mo-doped amorphous Ni(OH) 2 enriches electron density around Fe atoms, modulating their electronic state and optimizing intrinsic activity. As an alkaline hydrogen evolution catalyst, Mo-NiOH@Fe 3 O 4 requires overpotentials of only 23.7 and 140.6 mV to achieve 10 and 100 mA cm −2 , respectively, demonstrating exceptional catalytic activity. Furthermore, it shows negligible performance degradation at 100 mA cm −2 and maintains stability for over 120 h. This work demonstrates that a heterostructure strategy, integrating Mo-doped amorphous Ni(OH) 2 with Fe 3 O 4 , provides a reasonable route for developing low-cost, high-performance HER catalysts.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 9
·092509
·
IF 3.3
Zhize Yu,Tingting Tang,Yutao Cao,Shuo Cui,Min Li,Ying Wu,Wenhui Fang,Zengxi Li,Hong Zhao
Incorporating catalytic metals with alloy can significantly facilitate electrocatalysis of hydrogen evolution reaction (HER) through a synergistic effect. However, constructing an effective metal-alloy heterointerface remains a challenge. In this study, we synthesize a Ni/Ni4Mo catalyst on Ni foam (NF) through a straightforward two-step electrodeposition process. Initially, Ni4Mo is obtained using a constant potential deposition method. Then the incorporation of Ni leads to the formation of Ni/Ni4Mo heterointerface, increasing interfacial activity and exposing more active sites, thereby enhancing the electrocatalytic performance. The Ni/Ni4Mo@NF catalyst exhibits outstanding HER performance with low overpotentials of only 148 mV at 500 mA cm−2 and 24 mV at 100 mA cm−2 in 1 M KOH. Furthermore, in a combined glycerol oxidation reaction (GOR) and HER system, the Ni/Ni4Mo@NF||Ni/Ni4Mo@NF requires only 1.41 V to achieve a current density of 50 mA cm−2, a 260 mV reduction compared to conventional overall-water splitting. The Ni/Ni4Mo catalyst also demonstrates good long-term stability. This work provides key insights into designing high-performance metal-alloy heterointerface catalysts for energy-efficient hydrogen production.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wendi Wang,Jianxin Wang,Danfeng He,Xin Huang,Yutong Yang,Xi Chen,Lijie Zhao,Hong Pan,Jun Zhang
Layered double hydroxides (LDHs) are promising electrode materials for supercapacitors, owing to their high theoretical capacitance and excellent redox activity arising from their unique layered structure and the synergistic effects of bimetallic elements. Among them, NiV-LDHs stand out as a promising candidate for high-performance capacitors, since the + 2/+ 3 valence states of nickel and the multi-valence states of vanadium (+3/+4/+5) synergistically facilitate rapid and reversible pseudocapacitive reactions, significantly enhancing specific capacitance. However, the high-coordination structure of V 5 + tends to collapse during charge-discharge cycles, leading to reduced cycling stability. To address these issues, this study proposes a dynamic electronic balancing strategy to regulate electron transfer from Ni to V, thereby suppressing the formation of unstable high-coordination V 5+ and improving the structural stability of NiV-LDH. Through the electrochemical polymerization and intercalation of thiophene-3-carboxylic acid (3TCA) into the LDH layers, the resulting poly(thiophene-3-carboxylic acid) (P3TCA) acts as a conductive bridge to dynamically adjust the electron distribution between Ni and V. This redistribution enhances the activity of Ni while stabilizing the structure of V. The optimized NiV-LDH/NF/P3TCA electrode demonstrates exceptional cycling stability and charge transfer kinetics. Remarkably, it achieves an ultra-high specific capacitance of 2040 F g −1 at 1 A g −1 and maintains 78.72 % of its initial capacity after 5000 cycles, underscoring its potential for high-performance supercapacitor applications.
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2025
·Vol. 58
·期 38
·385502
·
IF 3.2
Qixiong Zhang,Jiujun Zhu,Yafei Hou,Qi Yang,Hai Jiang,Jing Cuan,Weiping Li
Dielectric capacitors offer fast charge/discharge rates and high-power density but are limited by low energy density, requiring bulky stacking. Although single-layer composites attempt to combine both high dielectric constant and breakdown strength, a trade-off often limits their effectiveness. To resolve this conflict, sandwich-structured composites spatially separate polarization and insulation functions into different layers. However, the abrupt dielectric contrast at interlayer interfaces often results in localized electric field distortion, undermining breakdown reliability. In this work, we develop filler-gradient composites by varying the loading of Ni(OH)2 nanosheets to construct transitional interlayers. This design mitigates electric field imbalance in conventional sandwich structures, enhancing dielectric constant, breakdown strength, and energy density. The results demonstrate that the filler-gradient structure facilitates uniform electric field distribution and enhanced interfacial polarization, resulting in a high energy density of 21.1J cm−3 at 685.5MV m−1, and discharge efficiency of 70.1%.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhicheng Liu,Manli Wang,Ming Hou,Yun Zhao,Wenbin Yang,Yangkai Han,Zhigang Shao
In traditional CO 2 electrolysis systems, oxygen evolution reaction (OER) consumes 90 % of the electricity input, whereas the product of oxygen holds minimal value. Moreover, the use of different electrocatalysts for the anode and cathode remains a challenge due to high capital costs of the electrolysis system. Substituting the OER with thermodynamically advantageous value-added anodic reactions and developing bifunctional electrocatalysts are crucial for the advancement of CO 2 electrolysis. In this study, for the first time, we present an innovative CO 2 electrolysis system that integrates CO 2 electroreduction reaction (CO 2 RR) with SO 2 electrooxidation reaction (SO 2 OR) and employ Ni-N-C as the bifunctional electrocatalysts to produce CO and H 2 SO 4 simultaneously. Notably, the novel CO 2 electrolysis system can reduce the cell voltage by 1.05 V, resulting in nearly 50 % reduction in energy consumption. This is also the first attempt to use Ni-N-C to catalyze SO 2 OR, showing markedly superior performance compared to commercial 20 % Pt/C. In-situ ATR-SEIRAS and DFT calculations demonstrate that the NiN 4 sites in Ni-N-C catalysts augment the direct conversion of *SO 2 to *HSO 4 - , identified as the rate-determining step for the SO 2 OR. This work provides guidance for the design of novel CO 2 electrolysis systems, the construction of bifunctional electrocatalysts, as well as the mechanistic investigation of the SO 2 OR.
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高影响因子
Materials Today Energy
·
2024
·
IF 9
Hang Lou,Nan Li,Ruxia Zhang,Yanhui Chen,Chao Xie,Hao Jiang,Yahui Yang,Wenjun Zhang
Efficient Ni-based catalysts for small organic molecule electrooxidation are crucial yet challenging to develop. This study presents self-supported nickel-nickel Hofmann-type coordination polymer nanoplate arrays (Ni-HCP- t /NF) synthesized through an electrochemical semi-sacrificial growth strategy. By controlling the growth time of Ni-HCP- t nanoplates, we optimized the structure and electrochemical performance, with Ni-HCP-40/NF exhibiting significant bifunctional electrocatalytic activity for urea and methanol oxidation reactions (UOR and MOR), achieving a current density of 100 mA cm −2 at only 1.44 and 1.46 V (vs. RHE), respectively. Moreover, urea-water and methanol-water electrolysis systems using Ni-HCP-40/NF as the anode demonstrate reduced voltages of 1.61 and 1.64 V for urea-water and methanol-water electrolysis at 100 mA cm −2 , respectively, dramatically lower than water electrolysis (1.85 V). The superior UOR/MOR activities are attributed to the abundant and fully exposed Ni sites and efficient electron/mass transfer rate facilitated by three-dimensional nanoplate architecture.
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