INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 40
·期 1
·488-500
·
IF 2.93
Donghong Duan,Jianwei Liang,Huihong Liu,Xiu You,Huikai Wei,Guoqiang Wei,Shibin Liu
Carbon-supported Ni–Au nanoparticles with a core–shell structure (Ni@Au/C) are prepared by a combination of reverse microemulsion and two-step reduction. The prepared Ni@Au/C nanoparticles are used as anode electrocatalysts in direct borohydride-hydrogen peroxide fuel cells (DBHFCs). The physical and electrochemical properties of the as-prepared catalysts are investigated using transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical quartz crystal microbalance (EQCM), chronoamperometry (CA), chronopotentiometry (CP) and fuel cell test. The average size of the particles are approximately 10 nm. Among the resultant catalysts obtained in this study, the Ni 1 @Au 1 /C catalyst exhibits the highest catalytic activity for the direct electro-oxidation of borohydride . DBHFCs fabricated using Ni 1 @Au 1 /C as an anode catalyst and Pt mesh (1 cm × 1 cm) as a cathode electrode achieves a maximum power density of 74 mW cm −2 with a discharge current density of 130 mA cm −2 at 20 °C.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yingang Gui,Shasha He,Yunfeng Wang,Jiacheng Yang
This study proposed a self-powered bio-sensing positioning system driven by MOF-derived porous Ni/C material-based hybrid nanogenerator. The porous structure of Ni/C nanoparticles provides a high specific surface area, increases the capacitance of the nano-composite, and traps more charges due to the formation of micro-capacitors, which boost the performance of TENGs. The as-fabricated enhanced TENG achieved a peak voltage of 820 V and a power density of 10.1 W/m 2 . An optimal bilayer structure was determined through experiments and simulations to obtain the maximum output performance. Flexible TENGs are placed on various parts of the body to achieve biomechanical energy harvesting and motion monitoring, and provide power sources for small electronics. By combining with electromagnetic generator (EMG), a wearable self-powered positioning system is constructed. This work provides a new idea to enhance the output of TENG, and broadens the application of TENG in self-powered wearable systems.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
J. He,X.-H. Lu,Y. Shen,R. Jing,R.-F. Nie,D. Zhou,Q.-H. Xia
Cyclohexanol is an excellent starting material for fuel production, but direct selective hydrogenation of phenol to cyclohexanol under mild conditions is a challenge. Herein we report a catalyst made of Ni nanoparticles supported on high-surface silica, which is highly active for selective formation of cyclohexanol under 1.0 Mpa pressure of hydrogen in aqueous medium without additives. Conversion of 100 mol% and selectivity up to 100% are achieved within 4 h and 1.0 MPa H 2 . Some factors such as the type of the source of silica, the loading of Ni, the reaction temperature and time, the H 2 pressure play important roles in controlling the selective hydrogenation. The generality of the 10%Ni/SiO 2 -1 catalyst for this reaction is demonstrated by selective hydrogenation of other hydroxylated aromatic compounds as well.
研究领域:
催化化学
·
有机合成
·
材料化学
·
绿色化学
·
能源化学
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Hui-Xian Yang,Dong-Lin Zhao,Wen-Jie Meng,Ya-Qian Wu,Yu Yang,Hao Pu,Rui-Ze Gao
Electrochemical energy storage (EES) devices that combine high-performance are essential to resolve the extreme shortage of non-renewable energy sources and environmental issues. Nickel oxide (NiO) is considered to be a promising EES cathode material because of its ultra-high theoretical specific capacitance, whereas the practical applications are greatly limited with poor rate and cycle performance. Herein, we report the yolk-shelled NiO/Ni composites (YS NiO/Ni) that exhibit good charge storage capability in the aqueous electrolyte with high specific capacitance (2207.3 F g −1 at 1 A g −1 ), exceptional rate capability, and ultra-high cycling stability (95.8% retention after 10,000 cycles). The superior property can be ascribed to the special yolk-shelled structure that exposes more redox reaction active sites, and the associate Ni nanoparticles with flower-like NiO which can improve electron transfer as current collectors.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
·
电化学能量存储
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Liqianyun Xu,Liuyang Zhang,Bei Cheng,Jiaguo Yu,Ahmed A. Al-Ghamdi,S. Wageh
Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor application. Herein, simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably enhanced. We discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated counterpart. The areal capacitance of the treated sample rockets up to 6.13 F cm −2 at 2 mA cm −2 , almost 13 times higher than the untreated ones. Besides, the resistance is substantially reduced by cyclic voltammetry treatment. Moreover, the Coulombic efficiency and stability are concurrently elevated. The reasons behind this treatment are mulled over and reasonable hypothesis is suggested. This study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.
研究领域:
材料科学
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电化学
·
纳米材料
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能源存储
·
功能材料
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高影响因子
Energy Technology
·
2021
·Vol. 10
·期 2
·2100350
·
IF 3.631
Liyue Xiao,Shuangrui Yao,Jie Liu,Hanjun Zou,Yanqin Xu,Yuan Cao,Changguo Chen
The nickel-based metallic organic framework (Ni-MOF) [Ni 2 (OH) 2 (C 8 H 4 O 4 )] material with a hierarchical microblocks structure is efficiently synthesized in 2 h by the ultrasonic method. At the moment Ni-MOF is used as the electrode materials and the supercapacitors (SCs) perform very well with great electrochemical capacity which exhibited particular electric capacitance of 631 C g −1 at a current density of 1 A g −1 . This is one of the highest performances and the shortest synthesis time reported so far for MOFs. Besides, there is a battery – SC hybrid SC assembled by using Ni-MOF and activated carbon. On the condition of having a power density of 302.2 W kg −1 with the voltage window of 1.2 V, the SC produces an energy density of 28.5 W h kg −1 . During the same period, the SC maintains outstanding cycling stability capacitance retention of 85.5% after 3000 cycles at current density of 10 A g −1 . The great electrochemical capability is due to the distinct crystal texture and particular morphological feature. Herein, it is displayed that the ultrasonic method is a fast and effective approach for preparing Ni-MOF SC electrode materials.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
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高影响因子
ACS Earth and Space Chemistry
·
2019
·
IF 2.243
Zong-Sheng Liang,Bao-Dong Song,Yong-Ling Liu,Yong Liu,Hai-Tao Ren,Song-Hai Wu,Shao-Yi Jia,Xu Han
Natural pyrite has a strong ability to immobilize Ni(II) impurities. However, the differences in the oxidation reactivity between Ni(II)-adsorbed pyrites [Py*-Ni(II)] and Ni(II)-structurally incorporated pyrites [Py-Ni(II)] are still not clearly understood. In this study, Ni(II)-free pyrite (Py-free), Py*-Ni(II), and Py-Ni(II) were prepared, and their oxidation reactivity were compared. Our results show that Ni(II) can be successfully incorporated into the crystalline structure of Py-Ni(II) by replacing structural Fe(II) with the formation of sulfur defects on the surface of Py-Ni(II). The oxidation reactivity of different pyrites depends on how Ni(II) is immobilized in pyrite and follows the order of Py-0.08 > Py-0.02 > Py-free > Py*-Ni(II) [Py-0.02 and Py-0.08 are named according to the Ni(II):Fe(II) molar ratios in the starting material for the synthesis of Py-Ni(II)], indicating that structurally incorporated Ni(II) enhances the oxidation rate of pyrite, whereas adsorbed Ni(II) does the opposite. Differences in the electrochemical properties also indicate that structurally incorporated Ni(II) enhances the electron-transfer rates at the Py-Ni(II) surface, thus increasing the oxidation rates of pyrite. Variations in H2O2 concentrations confirm that the high electron-transfer rates induced by structurally incorporated Ni(II) enhance the reaction rates between dissolved oxygen and the pyrite surface, producing H2O2 at pHs 2.5 and 7.0. The presence of Fe(III)-S(-II) defects also significantly contributes to the production of H2O2. Variations of cumulative ·OH indicate that structurally incorporated Ni(II) improves the production of ·OH at pHs 2.5 and 7.0. The significantly higher concentrations of ·OH than those of H2O2 at pH 2.5 indicate that ·OH plays an important role in pyrite oxidation under acidic condition. The comparable concentrations of H2O2 and ·OH at pH 7.0 suggest that H2O2, ·OH, and even Fe(IV) formed between pyrite and H2O2 contribute to pyrite oxidation under pH-neutral condition.
研究领域:
环境化学
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地球化学
·
矿物表面科学
·
氧化过程
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高影响因子
RSC Advances
·
2026
·Vol. 16
·期 3
·2205
·
IF 4.6
Qilin Guo,Jianchun Ma,Wenbo Lu,Ying Wang,Ergui Luo,He Xiao,Li Zhang,Haishun Wu,Tianjun Hu,Jianfeng Jia
The development of high-performance anode materials remains a critical challenge in advancing microbial fuel cells (MFCs). In this work, we present a novel strategy employing ternary transition metal Co-Fe-Ni sulfides to overcome the inherent trade-off between catalytic activity and structural stability commonly observed in conventional polymetallic sulfides. Through a facile one-pot solvothermal approach, we synthesized low-crystallinity CoFeNiS x (Co-Fe-Ni) ternary sulfides with precisely tunable Co/Fe/Ni molar ratios. When integrated as an MFC anode, the optimized Co-Fe-Ni sulfide delivered a maximum power density of 3915 mW m −2 using Escherichia coli ( E. coli ) as the biocatalyst, representing an 8.4% enhancement over its binary CoFeS x (Co-Fe) analogue. This performance exceeds that of most previously reported carbon-based anodes. The synthesized transition metal sulfides combine ease of fabrication with outstanding electrocatalytic efficiency. Our findings highlight the underexplored potential of ternary transition metal sulfides in engineering next-generation bioelectrochemical interfaces. Doping Ni into Co-Fe anode forms novel intermetallic linkages, accelerating electrochemical kinetics and reducing charge transfer resistance for maximum MFCs power output.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124587
·
IF 7.5
Xiaoyan Han,Huiling Weng,Yani Shen,Jianjun Chen,Yu Xie,Qiulin Zhang,Ping Ning,Jiming Hao
CO 2 methanation is an important route for carbon emission mitigation and renewable energy storage. However, insufficient CO 2 activation and inefficient hydrogenation of surface intermediates at low temperatures remain major challenges. In this work, Ni/CeO 2 catalysts with distinct metal-support interaction degrees were constructed by regulating the interfacial contact of Ni-Ce, aiming to enhance the low-temperature methanation performance. The results suggest that Ni/CeO 2 with strengthened Ni-CeO 2 interfacial interaction exhibits more oxygen-vacancy-related defect sites, improved reducibility, and favorable Ni dispersion. These interrelated features collectively facilitate CO 2 adsorption/activation and intermediate conversion, thereby contributing to the enhanced low-temperature methanation performance. Specifically, the CO 2 conversion reached ∼80% at 250 °C. In situ Raman spectroscopy suggested the dynamic evolution of oxygen-vacancy-related defect sites during the reaction, while in situ DRIFTS suggested that CO 2 methanation may proceed through both the formate-mediated pathway and the CO* pathway. These findings suggest that tailoring the Ni-Ce interfacial interaction, together with the associated changes in oxygen vacancy related defects, reducibility, and Ni dispersion, may provide an effective approach to improving the low-temperature CO 2 methanation performance of Ni-based catalysts.
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高影响因子
ACS Omega
·
2026
·
IF 5.2
Qing Lin,Haoran Jiang,Yong Hu,Ziwen Dong,Song Kong,Yangli Cui
Addressing the practical predicament of uneven global distribution of phosphate resources, this study focuses on transition-metal-based short-chain perfluorocarboxylates (Mn-TFA and Ni-TFA) and systematically investigates their flame-retardant properties, aiming to develop efficient novel phosphorus-free flame retardants. The results of micromorphological characterization indicate that Mn-TFA forms a porous network structure, and Ni-TFA exhibits a polyhedral morphology, both of which possess distinct crystallinity attributed to the coordination interaction between metal ions and carboxylate groups. Flame-retardant performance evaluation demonstrates that samples display excellent flame-retardant effects: their flame-retardant performance is significantly superior to that of ammonium dihydrogen phosphate (the core active component of commercial flame retardants) at all tested concentrations. Particularly under medium-concentration loading conditions, the flame-retardant paper can achieve a self-extinguishing effect. The results of TG-IR-MS combined analysis show that the generation rates of CO and CO2 in the fuel system are significantly accelerated under the action of the flame retardants, indicating that the flame-retardant process is dominated by the condensed-phase effect.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Shan Yue,Jiayi Gao,Hui Kan,Ting Zhang,Xiangdong Ma,Rui Liu,Mingjing Zhao,Xiaohong Xia
Modulating the electrocatalytic interface is key to efficiently converting 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA). Herein, a NiCo( OH ) x /NiCoMoO 4 heterojunction electrocatalyst is constructed. The high-valence Mo 6+ substrate acts as an electron regulator, creating electron-deficient Ni sites and promoting the formation of active Ni 3+ species for HMF oxidation. Operando analysis and distribution of relaxation times (DRT) studies confirm that the Mo 6+ substrate enhances charge transfer and mass transport. This special electronic structure directs selective aldehyde group activation, steering the reaction along the HMFCA pathway. The obtained catalyst achieves a 91.4% FDCA yield with 96% Faradaic efficiency at 1.4 V vs. RHE. This work demonstrates a dual modulation strategy via high oxidation state substrate for efficient biomass conversion.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Huimin Feng,Xinxin Pi,Yanhui Li,Yunkai Wang,Mengjin Wen,Chengrui Wang,Chunlei Zhang,Yan He
The improvement of rechargeable zinc-air batteries is still limited by the sluggish oxygen electrochemistry at the air cathode, where both the oxygen reduction and oxygen evolution processes need to be accelerated. In this work, a Ni/Ni 3 C composite was obtained by thermal treatment using ammonia-activated carbon nanotubes as the conductive backbone and coal tar pitch as a supplementary carbon precursor. Ni and Ni 3 C nanoparticles are anchored on the nanotube framework, and part of their surface is wrapped by graphitized carbon. Such a multiphase architecture builds efficient electron-transport channels, reinforces the coupling between the Ni-based species and the carbon matrix, and improves structural robustness under electrochemical conditions. The catalyst therefore shows strong bifunctional oxygen electrocatalytic activity, giving a half-wave potential of 0.86 V for ORR and an overpotential of 250 mV at 10 mA·cm −2 for OER, together with satisfactory durability. When assembled as the air cathode of a rechargeable zinc-air battery, it affords an open-circuit voltage of about 1.42 V, a peak power density of 195 mW·cm −2 , and stable cycling for more than 200 h at 5 mA·cm −2 . DFT calculations indicate that nitrogen-containing interfacial sites reshape the local charge distribution and improve the adsorption and conversion of oxygen intermediates, which is favorable for both ORR and OER.
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高影响因子
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