JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Xin Guo,Menggang Li,Yequn Liu,Yarong Huang,Shuo Geng,Weiwei Yang,Yongsheng Yu
Rational construction of MnCo 2 O 4 -based core-shell nanomaterials with distinctive and desirable architectures possesses great potential in the advanced electrode material of high-performance supercapacitors. Here, a new class of hierarchical core-shell nanowire arrays (NWAs) with a shell of NiWO 4 nanoparticles and a core of MnCo 2 O 4 nanowires is reported, which can significantly improve the electrochemical energy storage properties of supercapacitors. The unique core-shell structure endows the MnCo 2 O 4 @NiWO 4 NWAs electrode with a high areal specific capacitance of 5.09 F cm −2 at a current density of 1 mA cm −2 and a superior cyclic retention of 96% after 5000 charge-discharge cycles, which are more preferable than those of MnCo 2 O 4 NWAs electrode. More importantly, an aqueous electrochemical energy storage device (core-shell MnCo 2 O 4 @NiWO 4 NWAs as the positive electrode and active carbon as the negative electrode, MnCo 2 O 4 @NiWO 4 //AC ASC) was assembled and shows a high energy density of 0.23 mWh cm −2 at a power density of 2.66 mW cm −2 , and 0.09 mWh cm −2 at 16.00 mW cm −2 , indicating hopeful potential for practical applications. This work highlights the significance of NiWO 4 as a shell for hierarchical core-shell nanostructures, which can further improve the electron transport characteristic of the electrode material, thereby achieving performance breakthroughs in energy storage devices.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Changqing Li,Xu Zhao,Yiwen Liu,Wei Wei,Yuqing Lin
Developing highly active and stable electrocatalysts from earth-abundant elements are imperative for the large-scalable production of hydrogen. Herein, the three dimensional amorphous NiCoS x O y nanosheets arrays directly grow on Ni foam (NiCoS x O y NSs/NF) through a facile one-step electrodeposition is firstly reported. The special in-situ grown 3D nanosheets arrays, largely exposed active sites and enhanced electrical conductivity enable the resultant NiCoS 0.14 O 3.25 NSs/NF to possess remarkable electrocatalytic performance and stability towards water splitting in 1 M KOH. Specifically, the introduction of S ligand into the hydroxides through a straightforward and convenient electrodeposition method boost the robust composition and comprehensive activity of the NiCoS x O y NSs. Such binder-free, easily prepared NiCoS 0.14 O 3.25 NSs/NF electrode requires the overpotential of 250 mV and 170 mV at 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When functionalizing as two identical cathode and anode in an alkaline electrolyzer, NiCoS 0.14 O 3.25 NSs/NF displays the efficient and robust property on both OER and HER. Remarkably, serving as bifunctional electrode in alkaline electrolyzer, it only needs 1.64 V to reach the current density of 20 mA cm −2 . This study provides a valuable guideline to synthesize non-noble and efficient bifunctional electrocatalysts using a time-saving but facile electrochemical method.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Keyu Tao,Yun Gong,Qingfeng Zhou,Jianhua Lin
Co-Mo-O (Co 1.2 MoO 4.2 ·1.3H 2 O)/Ni 3 S 2 nanosheet arrays were in-situ grown directly on Ni foam (NF) by a facile two-step hydrothermal reaction , in which the untrathin Co-Mo-O nanosheets are connected to each other into a three-dimensional (3D) porous hierarchical architecture with Ni 3 S 2 entrapped on the underneath Ni support. The resulting Co-Mo-O/Ni 3 S 2 /NF exhibits an excellent electrocatalytic activity for oxygen evolution reaction (OER) in KOH solution, which yields a 50 mA cm −2 of OER current density at an overpotential of 0.29 V, outperforming the state-of-the-art noble RuO 2 (η 50 = 0.42 V), Co-Mo-O/NF (η 50 = 0.33 V) and Ni 3 S 2 /NF (η 50 = 0.31 V). And it demonstrates a high specific capacity of 340 mAh g −1 at 2 mA cm −2 with good capability (82.1% of the retention at 32 mA cm −2 ) in basic solution when used as supercapacitor electrode, which is superior to those of Co-Mo-O/NF (183 mAh g −1 ) and Ni 3 S 2 /NF (70 mAh g −1 ). The outstanding electrochemical performance of Co-Mo-O/Ni 3 S 2 /NF is associated with the synergistic effect of the individual components as well as the nanosheets directly grown on Ni conducting support with more active sites exposed. Furthermore, Co-Mo-O/Ni 3 S 2 /NF displays good durability in 12 h-electrolysis experiment for OER and 10000 charge-discharge cycles. It is expected to benefit from Ni 3 S 2 entrapped by the protective layer of 3D porous Co-Mo-O nanosheet arrays, which not only can provide channel for electrolyte ion to pass through, but also improve the stability of Ni 3 S 2 . In addition, the fabricated Co-Mo-O/Ni 3 S 2 /NF//Activated carbon (AC) asymmetrical supercapacitor shows an ultra-high energy density of 57.9 Wh kg −1 at a power density of 1.1 kW kg −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Chen Sun,Zimo Lou,Yu Liu,Ruiqi Fu,Xiaoxin Zhou,Zhen Zhang,Shams Ali Baig,Xinhua Xu
In this study, nanosized titanium nitride (nTiN) doped palladium/nickel (Pd/Ni) foam electrodes were prepared via electroless deposition method for the dechlorination of 2,4-dichlorophenoxyacetic acid (2,4-D). Characterization analyses including field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) revealed that nTiN was successfully doped onto the electrode surface. 2,4-D was first dechlorinated to intermediate products p -chlorophenoxyacetic acid ( p -CPA) or o -chlorophenoxyacetic acid ( o -CPA) and then to the final product, phenoxyacetic acid (PA). The effects of environmental factors including initial 2,4-D concentration, current density, reaction temperature and dissolved anions were also studied. High initial 2,4-D concentration increased the efficient utilization of active hydrogen atom [H] by nTiN doped Pd/Ni foam electrodes. Increases in current density promoted better dechlorination efficiency while the hydrogen evolution side reaction was undesirably increased, leading to a lower average current efficiency. Higher reaction temperature was proved to be favorable for the enhancement of dechlorination efficiency. NO 3 − and reduced sulfur compounds including S 2− and SO 3 2− showed negative impacts on Pd catalytic capability, whereas CO 3 2− and Cl − exhibited less adverse effects on dechlorination efficiency. The activation energy ( E a) value of 2,4-D dechlorination by nTiN doped Pd/Ni foam electrode was calculated to be 32.06 kJ mol −1 . Two typical stages namely electrode activation and efficient dechlorination procedures occurred in 2,4-D dechlorination by nTiN doped Pd/Ni foam electrodes. The reaction paths of [H] on the electrode were also summarized. The removal efficiency of 2,4-D dechlorination on nTiN doped Pd/Ni foam electrodes was observed to slightly decrease from 100% to 89.95% after 5 consecutive experiments.
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TALANTA
·
2017
·
IF 4.162
Qi Wang,Qian Zhou,Qicheng Zhang,Rongjia Shi,Shangshang Ma,Wenbo Zhao,Min Zhou
Preparation of high performance electrochemical biosensing interface for the sensitive and rapid detection of human metabolites is of great interest for health care and biomedical science. In this paper, based on the adhesion technique of marine mussels, we designed and prepared a novel biosensor with a micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam, which offered a three dimensional (3D) living environment for real cell. The constructed biosensor with a 3D micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Furthermore, the electrochemical experiments by electrochemical method for detection of superoxide anion (O 2 •− ) in situ released by cells were carried out by this biosensor we proposed. Results indicated that the 3D interface of mussel-inspired Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam offered an amicable platform for promoting cell adhesion, which was beneficial for enhancing biosensing activity. This proposed sensing platform provided high electroactivity and excellent electron transport with a lower detection limit (0.0170 μM), wider linear range 0.04–2.44 μM) and short diffusion distance to reaction sites. The case achieved the accurate detection of O 2 •− (in situ released by cells) based on the combination of mussel-inspired biomimetic adhesion technique, 3D micro/nano-biointerface construction and electrochemical biosensing technique.
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ENERGY & FUELS
·
2020
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IF 3.421
Fanghui Wang,Yimeng Luo,Yajun Zhang,Yanan Wang,Hong Zhu
A NiO–Ni foam composite carrier was prepared by the hydrothermal method. Ruthenium metal was supported on the NiO–Ni foam by electroplating, obtaining a highly active bush-like Ru/NiO–Ni foam catalyst. To investigate the effect of NiO on the structure and performance of the catalyst, a Ru/Ni foam catalyst was prepared as a reference. The structures of the carrier and both catalysts were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, and the performances of both catalysts were evaluated in alcoholytic hydrogen production from sodium borohydride. On the carrier with the NiO-treated surface, the active component Ru developed a three-dimensional bush-like structure that enhanced the catalytic activity. Indeed, the hydrogen production from alcoholysis of sodium borohydride was three times higher on the Ru/NiO–Ni foam catalyst than on the Ru/Ni foam catalyst, and the highest rate exceeded 6 L/g/min. The repeated-use stability of the Ru/NiO–Ni catalyst (10 times) also exceeded that of Ru/Ni foam (8 times). However, as both catalysts used the same active component (i.e., Ru), their activation energies were almost identical.
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高影响因子
RSC Advances
·
2020
·Vol. 10
·期 64
·39026-39032
·
IF 3.119
Ying Zhao,Dongyue Su,Wentao Dong,Xiaoyang Xu,Xiangjing Zhang,Yongqi Hu
The investigation of highly efficient catalysts for the electrochemical reduction of carbon dioxide (ER-CO2) is the most critical challenge to commercialize conversion and utilization of CO2. Herein we propose a new and very promising catalyst, high crystallinity Sn crystals on Ni foam (Sn@f-Ni), for the electroreduction reaction of CO2 in potassium bicarbonate aqueous solution. The catalyst is fabricated in situ on a pretreated Ni foam substrate through a galvanostatic electrodeposition strategy. SEM and XRD demonstrate that high crystallinity Sn crystals, with an average size of 2–3 μm, evenly dispersed on the Ni foam support can be reproducibly obtained. Electrochemical measurements demonstrate that the Sn@f-Ni electrode at the deposition current of 15 mA exhibits superior performance in promoting the ER-CO2. Tafel measurements show that except for electrodes with a deposition current of 5 mA, the Tafel slopes of the other four electrodes are all above 100 mV dec−1, which is consistent with a rate-determining initial electron transfer to CO2 to form a surface adsorbed intermediate, a mechanism that is commonly invoked for metal electrodes. A stable composition of syngas can be obtained by electrolysis at −1.7 V potential (vs. Ag/AgCl), indicating that the Sn surface with high crystallinity conforms to the Heyrovsky–Volmer mechanism at a potential of −1.7 V. The ratio of CO and H2 generation was about 1 : 2, meaning it could be used as syngas for preparing some valuable fuels. This work provided an efficient method to convert the surplus CO2 to valuable syngas.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
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IF 5.816
Chen Cheng,Dandan Li,Tao Zhao,Dong Wang,Dazhong Zhong,Genyan Hao,Guang Liu,Jinping Li,Qiang Zhao
A NiFe alloy was designed on nickel foam (NF) as a precursor using cathodic electrodeposition . NiFe 2 O 4 –Ni 3 S 2 nanorods (NRs) composite catalysts were prepared by Fe 3+ impregnation and further hydrothermal sulfuration methods. NiFe 2 O 4 –Ni 3 S 2 nanosheets (NSs) were also prepared by direct hydrothermal sulfuration of the NiFe alloy for comparison. Compared to the dense NS structure of the NiFe 2 O 4 –Ni 3 S 2 NSs/NF, the NiFe 2 O 4 –Ni 3 S 2 NRs/NF showed better oxygen evolution performance due to its unique weed-like NR array structure composed of additional oxygen evolution reaction (OER) active sites, with a strong electron interaction for Ni and Fe and the active sulfide synergistic effect with oxides . Therefore, Driving a current density of 10 mA cm −2 only requires an overpotential of 189 mV and the catalyst could provide 100 mA cm −2 continuously and be constant for more than 80 h in 1.0 M KOH. This experiment indicated that Fe 3+ immersion had an indirect regulating effect on the morphological growth of the catalyst, which provided a novel concept for designing better OER catalysts.
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ELECTROANALYSIS
·
2017
·Vol. 29
·期 5
·1243-1251
·
IF 2.851
X. Li,X.H. Niu,H.Y. Wu,S.C. Meng,W.C. Zhang,J.M. Pan,F.X. Qiu
Here we report a new molecularly imprinted electrochemical sensor (MIECS) for the impedimetric enzyme-free analysis of glucose. A computational modeling strategy was first utilized to screen promising functional monomers for imprinting assembly, and simulation data suggested that methacrylic acid (MAA) exhibited a preferable capability to recognize the target molecule compared to other common monomers. Then the MIECS was prepared via introducing MAA-based recognition sites onto a porous Ni foam with large surface. The fabricated sensor was subtly characterized by Raman spectroscopy, scanning electron microscopy, and cyclic voltammetry, and an impedimetric method was selected to detect the glucose target in a basic medium. Experimental results demonstrated that the proposed MIECS could selectively recognize glucose against coexisting species, with good linear responses of the charge transfer resistance upon the target concentration in the scope of 10∼55 mM. These results indicate its potential applications in the recognization and detection of glucose in complex matrices.
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高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Weihua Fei,Yun Song,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A visible-light-active Ni foam@ZnO@ZnFe-LDH composite photocatalyst was fabricated with well-defined porous 2D/2D interconnected nanosheets of ZnO and binary ZnFe layered double hydroxide (ZnFe-LDH) growing vertically on the Ni foam substrate. In view of the excellent conductivity of Ni foam, it can be used as an electrode substrate to deposit ZnO nanosheets on the surface by electrodeposition . Then the ultrathin layered 2D ZnFe-LDH was uniformly coated on ZnO nanosheets by hydrothermal method. A highly effective three-electrode photoelectrocatalytic (PEC) system was constructed with Ni foam@ZnO@ZnFe-LDH as photoanode. The 2D/2D core-shell heterojunction formed between ZnO core and ZnFe-LDH shell not only resulted in a narrowing bandgap and increased the visible light absorption of the ZnO, but also promoted the migration of the photogenerated electrons and then the degradation efficiency with a low applied potential was greatly improved. The dyes (Acid Red 1 as model) and hexavalent chromium ions (Cr(VI)) in water can be simultaneously removed by oxidation reaction on the anode and reduction reaction on the cathode, respectively. In addition, the Ni foam@ZnO@ZnFe-LDH composite photocatalyst also showed outstanding stability during the application process. Thus, the photoelectrocatalytic synergitic effect based on Ni foam@ZnO@ZnFe-LDH gives a simple and effective strategy to fast remove Cr(VI) and organic pollutants in PEC process at low voltage.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Xiaorui Wang,Lingxing Zan,Hongling Zhang,Kun Tian,Dan Zhu,Jian Li,Qiang Weng,Cuicui Wang,Qingbo Wei,Wenlin Zhang,Xiangyang Hou,Feng Fu
s Rationally regulating the inevitable dynamic evolution of the catalyst surface structure towards high efficiency for water electrolysis remains a significant challenge. Here, the ternary cobalt-iron-chromium double hydroxide (DH) was synthesized on nickel foam as a monolithic catalytic electrode (CoFeCr-DH/NF) for the oxygen evolution reaction (OER) via a simple electrodeposition technique. The optimized Co 0.7 Fe 0.3 Cr-DH/NF electrode exhibited remarkable catalytic activity and stability. The overpotential at the current density of 100 mA cm −2 is only 281 mV, far exceeding those of other monolithic catalytic electrodes. Furthermore, we elucidated the variations in the valence states of metals during the OER process and found the electrochemical oxidation of Co 2+ to Co 3+ and leaching of Cr. Importantly, Cr-leaching can induce surface reconstruction, which not only optimizes the surface electronic structure to enhance the intrinsic activity but also increases the surface irregularity to enlarge the electrochemically active surface area, thereby significantly improving the OER performance. Theoretical calculations revealed that OER preferentially occurred at the adjacent Cr-leached Co sites and confirmed that the Cr-leached trimetallic CoFeCr-DH performs an outstanding OER performance.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 23
·13562-13569
·
IF 12.732
Boran Wang,Mengjie Lu,Duo Chen,Qi Zhang,Wenwen Wang,Yutang Kang,Zhenxing Fang,Guangsheng Pang,Shouhua Feng
Self-supported nickel–iron nitride microsheet arrays coated with carbon are grown on commercial Ni foam (NixFeyN@C/NF) and used as an electrocatalyst for splitting of alkaline seawater. The porous architecture and superhydrophilic/superaerophobic surface ensure sufficient exposure of active sites and mass transfer. The synergetic coupling effect between the carbon coating and NixFeyN facilitates electron transport. The optimal anode (Ni3FeN@C/NF) and cathode (Ni3N@C/NF) electrocatalysts are employed to assemble a two-electrode seawater electrolyzer for overall alkaline seawater electrolysis, which delivers a large current density of 500 mA cm−2 at a low cell voltage of 1.91 V. The superior corrosion-resistance and electron conductivity of the electrocatalyst are responsible for its excellent durability up to 100 hours. This result suggests that transition-metal nitrides coated with carbon offer an effective route to fabricate high-performance and durable hybrid electrocatalysts for hydrogen production from seawater electrolysis.
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