INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yang Xiang,Linjian Yu,Kun Xiong,Haidong Zhang,Jia Chen,Xueqing Shi,Min Deng,Shiqian She
Using urea oxidation reaction (UOR) instead of oxygen evolution reaction (OER) is one of promising strategies for significantly diminish power consumption for hydrogen production from electrochemical water splitting. The electrocatalysts with cost-effective, multifunctional and high-performance are urgently required for enhancing UOR and hydrogen evolution reaction (HER), but this remains a challenge. Herein, we designed a bifunctional Ni(OH) x /p-Ni catalyst by electrochemical oxidation of Ni(OH) 2 in-situ grown on the surface of porous Ni membrane (p-Ni) to generate more abundant high-valence Ni 3+ active species, which is favorable for reducing the energy barrier of electrochemical reaction . At the same time, a large number of metallic oxygen bonds (Ni–O) were formed to optimize the reaction kinetics of the electrochemical process, thus promoting the overall urea electrolysis efficiency. In 1.0 M KOH with 0.3 M urea, the optimized Ni(OH) x /p-Ni only requires potentials of 1.38 V and 0.22 V to obtain a current density of 100 mA cm −2 for UOR and HER, respectively. Notably, by assembling the Ni(OH) x /p-Ni as the cathode and anode for hydrogen production from urea-assisted water splitting, it can drive a current density of 100 mA cm −2 at a low voltage of 1.52 V and has excellent stability. This work provides a feasible strategy for design efficiently non-noble metal electrocatalysts for energy-saving hydrogen production and purifying urea-rich wastewater.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Hou Guangya,Wu Yitao,Chen Qiang,Zhang Jianli,Tang Yiping
Constructing low-cost, high-catalytic-performance anode electrocatalysts is a significant challenge for methanol oxidation (MOR) and urea oxidation (UOR) reactions. Using paper templates with abundant pores to prepare thin porous metal materials helps to obtain high-performance electrode materials. The nano amorphous B-doped Ni/crystalline Ni (nanoam Ni-B/Ni) foil composite electrodes were derived from paper templates prepared by impregnation, high-temperature reduction, and electrodeposition methods. Porous Ni foils (Nip) derived thinnest rice (“Xuan”) paper, initially used for Chinese calligraphy and painting, exhibits the best performance due to its strong adsorption and wettability. Compared to direct current electrodeposition, pulse electrodeposition yields finer amorphous B-doped Ni nanoparticles with good catalytic performance. Under a current density of 100 mA·cm −2 , the nanoam Ni-B/Ni composite electrode prepared under a duty cycle of 0.5–1.0 s achieved current densities of 290.4 mA·cm −2 (MOR) and 340.4 mA·cm −2 (UOR) at 0.8 V, which are improved by 37.1% and 55.1%, respectively, compared to those of Nip. After 2000 cycles, with solution replacement, the current densities maintained 99.2% (MOR) and 81.6% (UOR) of the original values, showing excellent electrocatalytic stability. This research provided a new use for Chinese rice paper, and the prepared Nip-based electrode, with a thickness of about 60 μm and a low area quality, had a simple preparation process and good electrochemical properties, and can be used as a potential substitute for commercial Ni foam for portable or small electrochemical devices. Graphical Abstract
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 4
·820
·
IF 4.6
Huijuan Han,Yalei Zhang,Chunrui Zhou,Haixin Yun,Yiwen Kang,Kexin Du,Jianying Wang,Shujun Chao,Jichao Wang
To achieve the “double carbon” goal, it is urgent to reform the energy system. The oxygen evolution reaction (OER) is a vital semi-reaction for many new energy-storage and conversion devices. Metal nanoparticles embedded in heteroatom-doped carbon materials prepared by the pyrolyzing of metal–organic frameworks (MOFs) have been a key route to obtain high-performance electrochemical catalysts. Herein, a nanocatalyst embedding Ni nanoparticles into S- and N-co-doped carbon nanoplate (Ni NPs@SN-CNP) has been synthesized by pyrolysis of a Ni-MOF precursor. The prepared Ni NPs@SN-CNP exhibits superior oxygen evolution performance with an overpotential of 256 mV to attain 10 mA cm −2 and a low Tafel slope value of 95 mV dec −1 . Moreover, a self-assembled overall-water-splitting cell with Ni NPs@SN-CNP/NF||Pt-C/NF achieves a low potential of 1.56 V at 10 mA cm −2 and a high cycling stability for at least 10 h. The improvement in this performance is benefit from its large surface area, unique morphology, and the nanostructure of the electrocatalyst. This study presents a novel and simple approach to designing high-performance OER catalysts.
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PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 19
·9598-9607
·
IF 6.97
Shiyu Zhang,Zhendong Yang,Ke Gong,Ben Xu,Hao Mei,Haobing Zhang,Jiaxin Zhang,Zixi Kang,Youguo Yan,Daofeng Sun
Conformal hydrolysis of MOF precursors is a promising strategy to prepare hierarchical metal hydroxide electrode materials on a large scale with low cost and high efficiency. However, a complete transformation is challenging due to the normal “outside-in” conversion process. After studying the hydrolysis of Ni-MOF-74, which has regular 1D channels, we suggest that the transformation to Ni(OH)2 can occur simultaneously outside and within the precursor depending on the treatment temperature. Molecular dynamics simulations reveal that a higher temperature weakens the steric effects of OH− ions and facilitates the diffusion in the regular channels, and therefore, a complete transformation from Ni-MOF-74 to Ni(OH)2 is achieved. It is for the first time demonstrated that the 1D channels of MOFs are utilized for the complete conformal hydrolysis of Ni-MOF-74 to Ni(OH)2 electrode materials. Meanwhile, we also perform pioneering work illustrating that the complete conformal hydrolysis is the key to the improved supercapacitor performances of the MOF-derived Ni(OH)2 electrodes. The prepared Ni(OH)2 electrode under the optimized conditions has a specific capacity of 713.2 C g−1 at a current density of 1 A g−1, which is at least 28% larger than those of the Ni(OH)2 prepared at other temperatures. The detailed analyses based on CV and EIS of the obtained Ni(OH)2 electrodes indicate that the residual MOFs within electrodes due to incomplete hydrolysis significantly influence the diffusion length and diffusion efficiency of OH−, drastically lowering the supercapacitor performances.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Atian Xie,Jiuyun Cui,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai
Realization of fast, efficient and continuous oil–water separation is of great significance for solving the problem of oil pollution. We present here a facile hydrothermal strategy to synthesize a superhydrophilic platanus fruit-like Ni@Ni(OH) 2 hierarchical architecture (SI-PFHA). Additionally, superhydrophobic platanus fruit-like Ni@Ni(OH) 2 hierarchical architecture (SO-PFHA) is obtained through stearic acid modification of SI-PFHA. Dual-channel separation system is integrated based on two superwetting membranes. Such separation system is competent for continuous light/heavy oil–water separation with high flux and high separation efficiency. Importantly, outstanding durability and reusability make this separation system a promising strategy for practical application in remediation of oily wastewater.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yudi Niu,Xing Qian,Jiahao Zhuang,Hongyu Liu,Linxi Hou
Owing to the modifiable compositions and morphologies, high-efficiency clean energy catalysts with complex functional structures attract wide-ranging attention. Herein, this report focuses on the controllably morphological MoS 2 -doped NiS 2 /Co 3 S 4 nanocubes which are derived from nickel-cobalt Prussian-blue analogs. After annealing in N 2 flow, MoS 2 /Ni-CoS x porous nanocubes are prepared via regulating the reactant ratios (1/2, 1/1 and 2/1) between (NH 4 ) 2 MoS 4 and Ni–Co Prussian-blue analogs. In the synthesis progress, (NH 4 ) 2 MoS 4 is applied as a bifunctional dopant source, which can expediently offer Mo and S elements simultaneously. The quaternary porous MoS 2 /Ni-CoS x (1/1) with the reasonable chemical composition, considerable specific surface area (86.7 m 2 g −1 ) and excellent electrocatalytic property can be selected as the representative counter electrode catalyst in dye-sensitized solar cells. Furthermore, the solar cell with MoS 2 /Ni-CoS x (1/1) exhibits a higher power conversion efficiency (9.80%) than that of Pt (8.19%) under a standard irradiation.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 4
·1731-1737
·
IF 2.2
Chen Minshu,Li Yuanxun,Li Fuyu
Here, Ca 5 Mn 4− x Ni x V 6 O 24 (CMNVO, x = 0.00–0.08) ceramics are successfully prepared by the solid-phase reaction method, and the connection between the physical phase information, microscopic morphology, Raman spectroscopy, and microwave dielectric properties is explored. The experimental results show that Ni 2+ occupies the Mn 2+ sites without altering the crystal structure and is effectively solid-solvated into the lattice. The relative density reaches a maximum value of 95.9% when the temperature (Tem.) = 900°C and x = 0.06. The trend of the dielectric constant ( ε r ) depends on the ionic polarization rate, and the quality factor ( Q×f values) are correlated with the microstructure and relative density. The maximum value of 43,800 GHz is reached at Tem. = 900°C and x = 0.06, and the temperature coefficient of resonant frequency ( τ f values) is enhanced from −75 ppm/°C to −52 ppm/°C. The CMNVO ( x = 0.06) ceramic obtains better microwave dielectric properties ( ε r = 11.4, Q×f = 43,800 GHz, and τ f = −52 ppm/°C). This ceramic material is expected to be a candidate for low-temperature co-fired ceramic (LTCC) microwave devices.
研究领域:
材料科学
·
电子工程
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 7
·3313-3319
·
IF 2.93
Jing Lin,Fei Liang,Yaoming Wu,Wanqiang Liu,Limin Wang
We prepared Ti 1.4 V 0.6 Ni ribbons by arc-melting and subsequent melt-spinning techniques. Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 1.5, 2, 2.5 and 3, wt.%) composite alloys were obtained by the mechanical ball-milling method. The structures and hydrogen storage properties of alloys were investigated. Ti 1.4 V 0.6 Ni + x Mg composite alloys contained icosahedral quasicrystalline phase, Ti 2 Ni-type phase, β-Ti solid-solution phase and metallic Mg. The electrochemical and gaseous hydrogen storage properties of alloys were improved with Mg addition. Ti 1.4 V 0.6 Ni + 2 Mg alloy showed maximum electrochemical discharge capacity of 282.5 mAh g −1 as well as copacetic high-rate discharge ability of 82.3% at the discharge current density of 240 mA g −1 compared with that of 30 mA g −1 , and the cycling life achieved above 200 mAh g −1 after 50 consecutive cycles of charging and discharging. The hydrogen absorption/desorption properties of Ti 1.4 V 0.6 Ni + x Mg ( x = 1, 2 and 3, wt.%) alloys were better than Ti 1.4 V 0.6 Ni. Ti 1.4 V 0.6 Ni + 3 Mg alloy also exhibited a favorable hydrogen absorption capacity of 1.53 wt.%. The improvement in the hydrogen storage characteristics caused by adding Mg may be ascribed to better hydrogen diffusion and anti-corrosion ability.
研究领域:
材料科学
·
金属功能材料
·
储能材料
·
物理化学
·
电化学
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Yijing Xia,Qizhou Dai,Jianmeng Chen
The novel nickel modified PbO 2 electrodes were successfully prepared via electrodeposition in nitrate solution. The influence of nickel content on the physico-chemical properties and electrocatalytic performance of PbO 2 electrodes was investigated. The electrodes were characterized by SEM, EDX and XRD techniques. A limited amount of doping nickel could produce a more compact PbO 2 film and diminish the size of the crystal grains. The steady-state polarization curves and the cyclic voltammetry analysis showed that the 1% Ni–PbO 2 electrode had the highest oxygen evolution potential and the optimal electrochemical oxidation ability. The cyclic voltammograms with various scan rates showed that the oxidation of aspirin on these PbO 2 electrodes was a typical diffusion-controlled electrochemical process. Stability tests of different PbO 2 electrodes showed that 1% Ni–PbO 2 electrode had the highest electrochemical stability. In addition, nickel modified PbO 2 electrodes were used to degradation aspirin in aqueous solution, which gave the direct evidence of the electrocatalytic capabilities of these electrodes. The results showed that 1% Ni–PbO 2 electrode obtained the highest kinetic rate constant, chemical oxygen demand (COD) and total organic carbon (TOC) removals, which were 1.41, 1.22, 1.20 times than those of undoped PbO 2 electrode, respectively. Moreover, the energy required for the treatment of 1 m 3 aspirin solution significantly decreased and the hydroxyl radical utilization rate was enhanced after appropriate nickel doping. As a result, the 1% Ni–PbO 2 electrode is a promising anode for the treatment of organic pollutants.
研究领域:
环境科学
·
电化学
·
污染控制
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高影响因子
Microstructures
·
2026
·Vol. 6
·期 4
·N
·
IF 8.5
Ding Zhou\u003Csup\u003E1,2\u003C\u002Fsup\u003E,Ruimin Shi\u003Csup\u003E3\u003C\u002Fsup\u003E,Chen Li\u003Csup\u003E2\u003C\u002Fsup\u003E,Anping Wang\u003Csup\u003E2\u003C\u002Fsup\u003E,Yu Gao\u003Csup\u003E2\u003C\u002Fsup\u003E,Qiang Wu\u003Csup\u003E4\u003C\u002Fsup\u003E,Qikui Man\u003Csup\u003E2\u003C\u002Fsup\u003E,Baogen Shen\u003Csup\u003E2\u003C\u002Fsup\u003E
The development of highly efficient microwave absorbers presents a significant challenge, driven by the growing issue of severe electromagnetic pollution. In this context, precise structural design emerges as a decisive factor for enhancing the microwave absorption capabilities. In this work, the hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres were fabricated through hydrothermal method, calcination treatment and further annealing. The results of the morphology observation demonstrate that the heterogeneous Ni0.5Zn0.5Fe2O4/C/Ni composites are hollow microspheres, consisting of many nanoparticles. Strikingly, the appearance of metallic Ni alongside increased carbon graphitization results from the partial reduction of Ni2+ by carbon during high-temperature annealing in the Ar atmosphere, which can be beneficial to the dielectric loss. The hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres possess outstanding microwave absorption capabilities, mainly owning to the better interface and dipole polarization, eddy current loss, conduction loss and natural resonance loss, multiply reflection and scattering between the microspheres. The hollow Ni0.5Zn0.5Fe2O4/C/Ni microspheres annealed at 700 °C exhibited an optimal reflection loss (RL) value of -35.79 dB at 2.5 mm and an effective absorption bandwidth (EAB) of 5.29 GHz at 2.0 mm. The present study reveals a design approach for heterostructures, which offers novel insights into the fabrication of high-performance microwave absorbing materials.
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2026
·Vol. 27
·期 7
·3193
·
IF 5.6
Da Zhang,Haiyu Qi,Bowen Lei,Xuan Guo,Feiyan Fu
Low-temperature methanation technology offers a promising pathway for carbon recycling and sustainable energy storage by enabling near-equilibrium CO 2 conversion under atmospheric pressure. However, efficiently activating CO 2 at low temperatures remains a significant challenge due to the kinetic limitations of hydrogenation intermediates. We construct a composite oxide–metal interface structure by anchoring highly dispersed CeCrO x nanoclusters onto metallic nickel via an ion-exchange method. This catalyst exhibits superior activity compared to conventional Ni/oxide catalysts with identical composition. Under atmospheric pressure at 220 °C, it achieves nearly 80% CO 2 conversion with over 99% methane selectivity and maintains excellent catalytic performance and structural stability during a 240-h continuous test. Systematic characterizations, including high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, CO 2 temperature-programmed desorption, and in situ DRIFTS reflectance infrared Fourier-transform spectroscopy, reveal that the synergistic modification by CeO 2 and Cr 2 O 3 not only optimizes the electronic structure of Ni to promote CO 2 adsorption and activation, but also enhances H 2 dissociation and intermediate conversion by regulating oxygen vacancy concentration and alkaline site distribution. Mechanistic studies indicate that the reaction follows a synergistic mechanism dominated by the formate pathway and assisted by the CO pathway. Moreover, the interfacial structure effectively stabilizes active sites and inhibits carbon deposition from CH 4 decomposition. This study provides a universal and effective strategy for designing Ni-based CO 2 conversion catalysts suited for mild reaction conditions and characterized by high energy efficiency.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Rui Xing,Yanan Jiang,Jia Li,Pengxiang Liu,Yuan Liu,Cuijuan Zhang
Despite significant advances in catalytic activity for CO2 methanation, the catalyst stability has received less attention, limiting its application. This work prepared Ni-supported on MgO-Al2O3 with varying Mg/Al ratio (x) and studied their deactivation mechanism. The deactivation was accelerated by a stability test at 600 °C for 200 h. The activity comparison before and after the stability test reveals that the sample with x = 0.4 shows the best stability without obvious activity decline. While the sample with x = 0.3 is deactivated due to Ni sintering, samples with x = 0.5 and 0.6 are deactivated by the oxidation of Ni, which easily forms a solid solution with excess MgO but is difficult to reduce. That assertion is supported by various characterizations. Such an oxidative deactivation is first-time reported for Ni-based catalysts for CO2 methanation, which could shed light on their rational design and industrial application.
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高影响因子
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