JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 2
·481-490
·
IF 2.647
Jiang Li-Li,Zeng Min,Wang Chao-Yang,Luo Zhi-Hui,Li Hai-Yang,Yi Yong
Carbon-supported platinum-nickel alloy catalysts have become one of the main choices of proton exchange membrane fuel cells (PEMFCs) due to the high catalytic activity toward oxygen reduction reaction (ORR). In this work, carbon aerogel supported platinum-nickel solid solution alloy catalysts (Pt 3 Ni/CA) with small particles (~ 3.5 nm) and uniform distribution were prepared via a simple one-step rapid reduction method during which no structure guide or stabilizer is added. In rotating disk electrode (RDE), the mass activity (MA, 0.25 A mg Pt −1 ) and specific activity (SA, 4.69 A m −2 ) of the optimized Pt 3 Ni/CA catalysts for ORR are nearly 3.8 times and 6.5 times that of the state-of-the-art commercial carbon-supported platinum catalysts (Pt/C, 0.07 A mg Pt −1 and 0.72 A m −2 ), respectively. After the accelerated durability test (ADT), the as-prepared Pt 3 Ni/CA catalysts still keep a satisfactory MA and SA which are more than 3.4 and 8.9 times as high as that of Pt/C. The Koutecký-Levich (K-L) equation shows that the electrochemical reaction conforms to be a 4e − process.
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DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Xiao Zhang,Ping Yang,San Ping Jiang
The effect of transition metal particle size and distribution on the catalytic performances of carbon nanotubes (CNTs)-based catalysts has been attracting considerable attention in recent years. In this paper, Ni nanoparticles with a Ni 3 C shell structure were embedded in N-doped CNTs by thermal condensation of dicyandiamide with Ni salts followed by MoS 2 nanosheets deposition. Most interesting, dissolution, redistribution and diffusion of the embedded Ni/Ni 3 C nanoparticles take place during the stage of deposition of MoS 2 nanosheets on the CNTs with the help of excess S precursors. The dissolution, redistribution and diffusion result in the disappearance of Ni nanoparticles and formation of much finer Ni nanoclusters , which significantly facilitates the deposition and formation of vertical MoS 2 nanosheets on CNTs. The homogeneous distribution of Ni nanocluster leads to improved intrinsic conductivity and increased active sites. N-doped CNTs with optimized Ni and MoS 2 loading revealed high activity and stability for electrocatalytic hydrogen evolution reaction (HER). The as-prepared MoNiCNTs electrocatalysts exhibit superior HER activity with low onset potential and small Tafel slope value in both acidic and alkaline electrolyte conditions. The result provides a new platform for rational design and fabrication of high-performance non-precious transition metal based HER electrocatalysts.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Hui Wang,Hao Zhu,Yuelan Zhang,Jianglong Pu
A series of CTAB-templated Ni/Ce catalysts were synthesized by adding CTAB during the hydrothermal synthesis of ceria to improve the pore structure of catalysts. Their catalytic performance was evaluated in the steam reforming of acetic acid and the effects of CTAB concentration on the porous structures , reducibilities , morphology, and activity of catalysts were studied. The catalysts were characterized by BET, XRD , H 2 -TPR, XPS , HRTEM , in-situ DRIFTS , DTG , FTIR , and temperature-programmed reaction to elucidate the structure-activity relationship of the catalyst. The results showed that owing to the CTAB assistance, a high surface area of ceria could be achieved, which induced a better Ni dispersion with a smaller Ni size, strengthened the interaction between Ni and CeO 2 , and promoted the reducibility of Ni, obtaining higher activity and lower methane yield than Ni/Ce. Among these prepared samples, Ni/Ce–C6 showed the highest surface area and the best catalytic performance with a hydrogen yield of up to 82.5% even at a low temperature (550 °C). Owing to the stronger Ni-ceria interaction of Ni/Ce–C6, the lattice oxygen in ceria migrates easily to the Ni surface , interacts with the reaction intermediates, and thus improves the CO 2 /CO ratio in the products. Much more CO and CO 2 and less CH 4 were observed over Ni/Ce–C6 during the temperature-programmed reaction, indicating its high activity. In-situ DRFITS characterization demonstrated that the two types of catalysts had similar reaction intermediates but various adsorption and conversion abilities toward the acetic acid. More reaction intermediates were adsorbed at low temperatures and a higher conversion was obtained over Ni/Ce–C6 owing to its better Ni dispersion. The CTAB assistance inhibited the formation of amorphous carbon but facilitated the formation of graphitic carbon at ∼637 °C which did not induce catalyst deactivation .
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高影响因子
Journal of Nanostructure in Chemistry
·
2022
·Vol. 13
·期 6
·577-589
·
IF 8
Tian Ruonan,Gao Zeyuan,Lang Ruifeng,Li Na,Gu Huilin,Chen Gang,Guan Hongtao,Comini Elisabetta,Dong Chengjun
Lately novel strategies to enhance the sensing properties on iron oxide have been proposed to achieve high performance gas sensors for acetone detection. In this working report, the synthesis of iron-glycerate (Fe-Gly) using glycerol to combine with Fe 3+ is first presented. Depending on the thermal treatment, this compound can evolve into γ-Fe 2 O 3 , α/γ-Fe 2 O 3 and α-Fe 2 O 3 . α/γ-Fe 2 O 3 shows better sensing performance as far as acetone detection is concerned. Using the dual phases of α/γ-Fe 2 O 3 as a fundamental building block, their sensing properties were further improved using Ni doping and Ru nanoparticles functionalization. The high response and selectivity to acetone detection was ascribed to the synergistic effects of unique nanosheets, mixed phases, rich oxygen vacancies and excellent catalytic activity of Ru nanoparticles. Graphical abstract
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Fengdong Qu,Wenan Shang,Dongting Wang,Shiyu Du,Tiju Thomas,Shengping Ruan,Minghui Yang
Multishell, stable, porous metal-oxide microspheres (Ni–Co oxides, Co3O4 and NiO) have been synthesized through the amorphous coordination polymer-based self-templated method. Both oxides of Ni and Co show poor selectivity to xylene, but the composite phase has substantial selectivity (e.g., Sxylene/Sethanol = 2.69) and remarkable sensitivity (11.5–5 ppm xylene at 255 °C). The short response and recovery times (6 and 9 s), excellent humidity-resistance performance (with coefficient of variation = 11.4%), good cyclability, and long-term stability (sensitivity attenuation of ∼9.5% after 30 days and stable sensitivity thereafter) all show that this composite is a competitive solution to the problem of xylene sensing. The sensing performances are evidently due to the high specific surface area and the nano-heterostructure in the composite phase.
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DOI
PubMed
高影响因子
ELECTROCHEMISTRY
·
2021
·Vol. 89
·期 5
·461-466
·
IF 1.381
Zunzhi WANG,Shengxian SHE,Mengyao LV,Xujun YUAN,Hui SUN,Jun ZHAO,Jian YU,Xufeng YAN
The properties exhibited by Ni-rich cathode materials were enhanced through the mixed coating layers of Li3PO4 and boric acid. The scanning electron microscopy (SEM), the transmission electron microscope (TEM), the differential scanning calorimetry (DSC), the Electrochemical Impedance Spectroscopy (EIS), as well as the half-cell and full-cell charge-discharge tests were adopted for characterizing the structure and electrochemical properties exhibited by the cathode materials. As revealed by results, the Li3PO4 and boric mixed coating layers can effectively reduce the surface area and protect the direct contact between cathode material particle surface and electrolyte, meanwhile improving the structural stability and cycle performance. The coating of fast ionic conductor contributes to enhance the specific capacity possessed by the Ni-rich cathode materials accordingly.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 112
·111539-111548
·
IF 3.289
Hui Deng,Shi-Xi Zhao,Xia Wu,Lei Wei,Yu-Feng Deng,Ce-Wen Nan
The chief drawback of Li2MnSiO4 cathode materials is structural instability deriving from the transformation of [MnO4] tetrahedra to [MnO6] octahedra during oxidation from Mn(II) to Mn(III) and the Jahn–Teller effect especially from Mn(III) to Mn(IV). Based on the theory that Ni2+ could keep the [NiO4] ligand unchanged and stable during oxidation/reduction, [NiO4] tetrahedra may behave as a regional structural framework to support the total crystal lattice and alleviate structural distortion partially. In this paper we synthesize nano-Li2Mn1−xNixSiO4/C samples with a small amount of Ni as the dopant via a hydrothermal route. Firstly, we discuss the existential state of Ni through XPS spectra, and demonstrate that both Ni2+ and metallic Ni coexist, especially Ni2+ could improve structural stability. The influence of Ni doping on morphology, structural stability, and electrochemical performance is discussed through Raman spectroscopy and electrochemical tests below. It is confirmed that there exists an optimal Ni content under which the optimal performance is displayed. In our work, the optimum Ni content is 5.0%, and the maximal discharge capacity achieved is 235 mA h g−1 for the 5.0% Ni doped sample in the first cycle.
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高影响因子
ELECTROCHEMISTRY
·
2020
·Vol. 88
·期 6
·532-539
·
IF 1.099
Ruifang CHEN,BiXia WEN,Changwei SU,Wei BAI,Junming GUO
LiMn2O4 cathodes are prepared by a rapid microwave-induced solution combustion method. Their initial discharge capacity is significantly improved by introducing trace Ni. For example, the LiMn1.975Ni0.025O4 (LMNO-0.025) cathode releases an initial discharge capacity of 134.1 mAh g−1 at 1 C, even 144.5 mAh g−1 at 0.5 C, which is far higher than of the pristine LiMn2O4 cathode (119.7 mAh g−1 at 1 C) and close to its theoretical capacity of 148.2 mAh g−1. After 1000 cycles, the capacity retention of the LMNO-0.025 sample reaches 56.53 % at 1 C, and it can be presented the higher capacity retentions of 66.79 % at 5 C and 66.89 % at 20 C. The robust structure stability proved by XRD, SEM and HRTEM data, and the good kinetics testified by CV and EIS data of the Ni-doped material are responsible to improve the high-rate capability and long cycle properties.
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高影响因子
Reaction Chemistry & Engineering
·
2020
·Vol. 5
·期 5
·886-895
·
IF 3.441
Xing-Gang Si,Yun-Peng Zhao,Qing-Lu Song,Jing-Pei Cao,Rui-Yu Wang,Xian-Yong Wei
A highly efficient Ni/N–C catalyst was synthesized by facile pyrolysis of a Ni-containing metal–organic framework (Ni-MOF), and its catalytic hydrogenolysis performance towards C–O bonds in lignin was evaluated in detail using diphenyl ether (DPE) as a model compound. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses show that the flower-like nanosheets of the Ni-MOF shrink, forming a loose and ordered spherical structure during pyrolysis. Under the optimal conditions, DPE was completely converted and the selectivity to monomers (benzene, cyclohexanol and cyclohexane) reached 99.1%. During the catalytic hydrogenolysis conversion (CHC) of DPE, the direct cleavage of the Caromatic–O bond affording benzene and phenol is the major reaction pathway, and a low H2 pressure is crucial to increase the monomer selectivity. Furthermore, Ni/N–C-450 shows high hydrogenolysis activity for other lignin-derived aryl ethers, such as benzyl phenyl ether, dibenzyl ether, dinaphthalene ether, benzyl 2-naphthyl ether and 3-methoxyphenol.
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高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Jean Pierre Mwizerwa,Chenlong Gao,Changyong Liu,Wenfei Lu,Menghao Yang,Jun Shen
Constructing a robust, highly Li-ion-conductive surface layer is an effective strategy to improve the interfacial stability of nickel-rich cathodes like LiNi 0 . 8 Co 0 . 1 Mn 0 . 1 O 2 (NCM811). However, existing methods often fail to balance ion/electron conductivity with suppression of surface phase transformations, leading to poor rate capability, cycling stability, and energy density. This work introduces an in-situ solution-phase formed coating of Li 4 SiO 4 (LSO) that creates a continuous ion/electron-conductive network across NCM811 particles. This LSO enhances lithium-ion transport, builds a stable electrode/electrolyte interface, and alleviates mechanical stress during cycling. As a result, NCM811@LSO exhibits improved electrochemical performance, including reduced voltage decay and stable operation at high voltages. The LSO coating suppresses surface degradation, intergranular cracking, and parasitic reactions by shielding active sites and reducing direct electrolyte contact. It also mitigates electrode polarization and localized overcharging during long-term cycling. Full-cell tests using graphite and SiO/C anodes confirm high energy densities, reaching 765 Wh kg −1 in NCM811@LSO//graphite cells. Furthermore, density functional theory (DFT) calculations support the experimental findings, revealing that LSO promotes favorable interfacial chemistry, suppresses internal cracking, inhibits nickel migration, and prevents irreversible phase transformations. Compared to traditional coatings, the multifunctional LSO layer offers superior protection and conductivity, making it a promising approach for developing advanced, high-energy-density lithium-ion batteries.
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yaolong Yang,Xuan Jiao,Binrui Wu,Jiahao Li,Yuanyuan Yang,Wanbo Chen,Yuying Wang,Xi Chen,Shenshen Zhang,Song Yang,Feiyan Fu
Superhydrophobic coatings have emerged as a promising solution for enhancing the durability and longevity of metallic materials in various industrial applications, especially in the field of metal anti-corrosion. However, previous coatings were complicated to prepare and exhibited limited corrosion resistance performance. In this study, we developed a corrosion-resistant and superhydrophobic coating with comprehensive protective capabilities using an environmentally benign and highly efficient two-step electrodeposition approach. This coating can be deposited on contoured surfaces for the corrosion protection of metallic substances. In the first electrodeposition step, sodium citrate was employed to promote the combination of copper and nickel, forming a rough copper‑nickel coating. In the second step, a cerium stearate coating was fabricated and modified. The morphology, structure, and corrosion resistance of the coating were comprehensively characterized. The results showed that the static contact angle of water on the coating could reach up to 155° at most, and the corrosion current density could be as low as 2.51 × 10 −10 A/cm 2 , enabling 1500 h immersion resistance in 10 wt% NaCl solution. Moreover, the coating's outstanding comprehensive performance enables it to withstand various harsh natural environments. This study provides a new theoretical support for the corrosion protection of metals under adverse natural conditions.
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产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 12
·1144
·
IF 4
Luan Liu,Hongru Liu,Baorui Jia,Xuanhui Qu,Mingli Qin
Electrolysis of seawater is considered a green route for hydrogen generation; however, its practical application is limited by strong electrode corrosion and slow OER kinetics in chloride-rich media. Herein, we report a crystal-facet engineering strategy to construct nickel hydroxide with a parallel array structure on nickel foil (denoted as Ni(OH)2/NFPA, where NFPA represents nickel foil with parallel array) via a facile two-step etching-hydrothermal method. Structural characterization confirms the formation of high-index Ni(220) surfaces and well-aligned hydroxide nanostripes, which promote more favorable bubble–electrode interactions and contribute to improved interfacial stability. Owing to its characteristic parallel array configuration, Ni(OH)2/NFPA exhibits outstanding OER performance in alkaline electrolyte, delivering a low overpotential of 256 mV at 10 mA·cm−2together with a Tafel slope as small as 74.9 mV·dec−1, surpassing commercial RuO2and disordered Ni(OH)2nanosheets. The optimized electrode also delivers remarkable durability, maintaining stable operation for 48 h at 100 mA·cm−2even under harsh alkaline seawater conditions at 80 °C. Bubble dynamics analysis reveals that the ordered array morphology produces a superaerophobic surface, enabling rapid detachment of oxygen bubbles and ensuring efficient mass transport. This study highlights facet-controlled construction of parallel nanoarrays as a promising approach to improve catalytic efficiency, corrosion resistance, and bubble management in seawater electrolysis, offering useful implications for the rational design of high-performance electrodes for practical hydrogen production.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）