ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
M.Y. Gao,C. Yang,Q.B. Zhang,Y.W. Yu,Y.X. Hua,Y. Li,P. Dong
Porous Ni-Cu alloy films composed of nanosheets are directly fabricated on Cu substrate using a facile potentiostatic electrodeposition approach from a 1:2 choline chloride-ethylene glycol eutectic solvent (ethaline) containing nickel chloride and copper chloride. Electrochemical co-deposition of Ni-Cu alloy in ethaline is found to be thermodynamically favorable in comparison to conventional aqueous solutions. The deposition process occurs via an instantaneous nucleation and growth of nanoparticles at the initial stage and develops vertically to form nanoporous structures arrayed with nanosheets over deposition time . The as-prepared porous Ni-Cu alloy nanosheet arrays exhibit enhanced electrocatalytic activity for the hydrogen evolution reaction (HER) in alkaline media , which displays a small Tafel slope of 57.2 mV dec −1 with a low onset potential of −48 mV vs. RHE at an optimal condition. It requires small overpotentials of −128 and −150 mV to drive catalytic current densities of 10 and 20 mA cm −2 , respectively. This facile electrodeposition method performed in ethaline provides an efficient way to fabricate porous Ni-based alloy nanosheets directly on a current collector, which is a promising technology for the synthesis of earth-abundant HER electrocatalysts .
研究领域:
电催化
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材料科学
·
能源化学
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纳米材料
·
电化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hui Wang,Houzhen Chen,Hongjiao Wang,Lei Wu,Qixing Wu,Zhongkuan Luo,Fang Wang
The electrochemical performance of the lithium−oxygen (Li−O 2 ) batteries largely depends on the material and architecture of the catalytic cathode. In this paper, to avoid the parasitic reactions of carbon and binder with discharge products and reaction intermediates, we proposed an effective design of a free-standing catalytic cathode for Li−O 2 batteries. The FeCo 2 O 4 @Ni electrode consists of FeCo 2 O 4 nanosheets grown directly on nickel (Ni) foam. The resultant hierarchical macroporous/mesoporous structure provides sufficient space for the insoluble discharge product Li 2 O 2 and catalytically active sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Consequently, the carbon- and binder-free self-supporting electrode has demonstrated a high discharge capacity with relatively low charge overvoltage and a better cycle performance than the corresponding carbon-based electrodes.
研究领域:
电化学
·
能源材料
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纳米材料
·
电催化
·
储能技术
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DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 3
·721-731
·
IF 8.273
Xu Hui,Jin Meng,Geng Jing,Zhang Shengbo,Zhang Haimin
The decentralized production of H 2 O 2 via a two-electron oxygen reduction reaction (2e − ORR) has emerged as a promising alternative to the energy-intensive anthraquinone (AQ) process. However, its practical application requires 2e − ORR electrocatalysts with high activity and selectivity. Herein, we report the synthesis of metallic Ni nanoparticles anchored on bacterial cellulose-derived carbon fibers (Ni-NPs/BCCF) via a facile impregnation-pyrolysis method as efficient electrocatalysts for 2e − ORR to H 2 O 2 . By tuning the amount of Ni precursor, the best electrocatalytic performance toward 2e − ORR was achieved for Ni-NPs/BCCF-20.7, affording a high H 2 O 2 selectivity of ∼90% and an onset potential of 0.75 V vs. reversible hydrogen electrode (RHE) in an alkaline electrolyte. Ni-NPs/BCCF-20.7 achieved the largest H 2 O 2 yield rate of 162.7 ± 13.7 mmol g cat −1 h −1 and the highest Faradaic efficiency of 93.9% ± 4.2% at 0.2 and 0.5 V vs. RHE from the bulk ORR system, respectively. Theoretical calculations revealed the more favorable “end-on” adsorption configuration of molecular oxygen on the exposed Ni(111) plane, which can effectively suppress the O-O bond dissociation, resulting in high selectivity for H 2 O 2 generation.
研究领域:
材料化学
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电化学
·
纳米催化
·
能源科学
·
环境工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Rui Lin,Lu Che,Dandan Shen,Xin Cai
How to improve durability of catalysts is the major challenge hindering the large-scale implementation of proton exchange membrane fuel cells (PEMFCs). The alloy catalysts have been developed in efforts to reduce platinum loading, enhance catalysts activity and durability for oxygen reduction reaction (ORR) of PEMFCs. This manuscript reports the application of stepwise reduction synthesis to synthesize Pt–Ni/C and Pt–Ni–Ir/C catalysts. The synthesized electrocatalysts were characterized by X–ray diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma mass spectrometry (ICP), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The results from CV and LSV showed that when as-prepared Pt–Ni–Ir nanocrystals are uniformly dispersed on the carbon support, the catalyst exhibits excellent electrocatalytic activity and stability. When the atomic ratio of Pt, Ni, Ir is 2:2:1, after durability test of 5000 cycles, rotating disk electrode (RDE) demonstrated ORR activities of the as-prepared catalysts with the highest mass activity (MA) of 351 m A ⋅ g P t − 1 at 0.9V iR-free and electrochemically active surface area (ECSA) of 80 m 2 ⋅ g P t − 1 , which is over 17 and 2 times than those of Pt/C JM (Johnson Matthey) catalyst, respectively. This work highlights the potential to use a preparative method which means step-by-step reduction synthesis to form ternary alloy catalysts for ORR of PEMFCs.
研究领域:
电化学
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材料科学
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纳米催化
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能源材料
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燃料电池技术
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表面科学
·
电催化
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·Vol. 48
·期 47
·17957-17969
·
IF 7.2
Wei Zhang,Dongliang Zhao,Jun Li,Zeming Yuan,Shihai Guo,Yan Qi,Yanghuan Zhang
Ball milling the powders of Mg-based alloys with transition metal compounds is effective for improving their hydrogen storage performances. In this experiment, the alloys of La 1.7 Y 0.3 Mg 16 Ni + x wt.% TiF 3 ( x = 0–10) were prepared through mechanical milling technology. XRD , SEM , HRTEM and granulometry were used to measure the composition and microstructure of alloys. The isothermal hydrogen storage property was measured by a Sievert apparatus. The results reveal that the TiF 3 additive in ball-milled samples transforms into MgF 2 and TiH 2 after the first hydrogen absorption . Adding TiF 3 enhances the crystallinity and reduces the average particle and crystallite sizes of alloys, which is beneficial to accelerating hydriding and dehydriding kinetics. Adding 7 wt% TiF 3 into alloy decreases the dehydrogenation activation energy from 72.2 to 64.0 kJ/mol and improves the hydrogen absorption rate at low temperatures, absorbing 3.50 wt% H in 0.5 min at 323 K.
研究领域:
材料科学
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氢能
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金属合金
·
机械球磨
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DOI
高影响因子
RENEWABLE ENERGY
·
2023
·
IF 8.7
Yixuan Yu,Huai Liu,Junhua Zhang,Heng Zhang,Yong Sun,Lincai Peng
Designing highly efficient non-noble metal catalyst for the selective hydrogenolysis of biomass derivatives to fuels and fine chemicals is a key pursuit for sustainable chemical industry but substantially challenging. In this contribution, we report, for the first time, the construction of amorphous bimetal Ni–Fe borides for efficient catalytic hydrogenolysis of biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-dimethylfuran (DMF) as a promising biofuel candidate. The as-prepared Ni 1.52 Fe 0.36 BO x catalyst afforded a near-quantitative DMF yield using ethanol as a green solvent under relatively mild operating conditions (1 MPa H 2 , 160 °C and 1 h), leading to an excellent DMF formation rate of 16.5 mmol DMF ·g cat −1 ·h −1 , which is 1.7–16.5 folds higher than the state-of-art nickel-based catalysts. Mechanistic investigations demonstrated that the Fe intervention is conductive to the generation of electron-enriched metal sites and powerful acidic sites in Ni 1.52 Fe 0.36 BO x catalyst, which favored the activation of hydrogen and the cleavage of C–O bond to accelerate the hydrogenolysis process. Moreover, Ni 1.52 Fe 0.36 BO x catalyst exhibited good recyclability as well as universality in the hydrogenolysis of various biomass-derived unsaturated aldehydes. This finding opens a new avenue for highly selective hydrodeoxygenation of renewable biomass feedstock to value-added chemicals with non-noble bimetal hybrids in a green and straightforward manner.
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 2
·937-952
·
IF 1.8
Zhang Xing,Wang Zhongze,Shu Sihao,Liu Shengnan,Wang Dandan,Chen Jixiang
ZrO 2 -supported Ni and Ni-Co alloy catalysts were synthesized by co-precipitation method and tested for the hydrogenation of phenol in aqueous phase. Cyclohexanol and cyclohexanone are dominatingly generated on all the catalysts, and the deoxygenation products are minor. The Ni-Co alloy gives higher phenol conversion and the total yield of cyclohexanol and cyclohexanone compared to the metallic Ni. This is attributed to high metal dispersion due to the formation of Ni-Co alloy and the synergetic effect of Ni and Co in the alloy. ZrO 2 -supported Ni-Co alloy with the Ni/Co atomic ratio of 1 and the metal mass loading of 15% possesses the best performance. The total yield of cyclohexanol and cyclohexanone reaches 91.3% with the cyclohexanol/cyclohexanone molar ratio of 2.79. The phase composition of ZrO 2 -supported Ni-Co alloy remains stable during recycling, while the slight sintering of ZrO 2 and Ni-Co alloy particles can account for the catalyst deactivation. It has also been found that the presence of water may facilitate the keto-enol tautomerization and stabilize the ketone intermediates, leading to higher cyclohexanone yield than using n-octane as solvent.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Lili Xiao,Xinhua Fang,Yuan Cao,Lin Hu,Jin Jiang
In this work, a new rod-like Ni-MOF (rNi-MOF) acted initially as an important catalyst in hydrolyzing of extrinsic Ni 2+ . Then rNi-MOF would also be etched by protons (the other product of hydrolysis) resulted in increasing free Ni 2+ that can bond with OH − for in-situ formation of Ni(OH) 2 coated on rNi-MOF. The amount of extrinsic Ni 2+ and water showed significant influences on morphology of rNi-MOF/Ni(OH) 2 . It was found the rNi-MOF/Ni(OH) 2 prepared by 4 mL water and 0.5 mmol Ni 2+ exhibited excellent electrochemical performances in detection of glucose due to its high specific surface area (220 m 2 g −1 ), abundant active Ni(II)/Ni(III) pairs. The rNi-MOF/Ni(OH) 2 modified glassy carbon electrode (rNi-MOF/Ni(OH) 2 /GCE) exhibited a high sensitivity of 3616 μA mM −1 cm −2 , the low detection of limit (0.7 μM). Moreover, the proposed modified sensor displayed a high reproducibility and stability which set a foundation for promising application in detecting of glucose in human serum with good recoveries (95 %–105 %).
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wangqiong Xu,Qiling Li,Fengrui Sui,Shimei Guo,Ruijuan Qi,Cuiqiong Yan,Lijuan Chen,Shubiao Xia,Junming Guo,Zhe Li,Rong Huang,Feixiang Cheng
Ni doping is a commonly used strategy to improve the electrochemical performance of LiMn 2 O 4 . Uncovering the structural changes of Ni-doped LiMn 2 O 4 during electrochemical cycling, particularly at the atomic level, is important to understand the mechanism of the relationship between Ni doping and performance improvement. Herein, we investigate the chemical and structural evolutions of the Ni-doped LiMn 2 O 4 electrodes before and after 1000 cycles at 10 C with atomic resolution and correlate them with changes in the electrochemical properties . We found that Ni 2+ ions doped into the Mn 16d sites to form a more steady LiNi x Mn 2-x O 4 phase construction, which can effectively stabilize the spinel structure by hindering Jahn − Teller distortion. Comprehensive atomic imaging demonstrated that Ni doping can suppress the formation of the unexpected Mn 3 O 4 , and rock-salt MnO phases on the surface and subsurface of LiMn 2 O 4 during cycling, which is conducive to stabilizing the MnO 6 octahedron and inhibiting the migration of Mn. Resultantly, splendid long cycling stability of 88.92 % after 1000 cycles at 10 C (1 C = 148 mAh g −1 ) for the optimized LiNi 0.05 Mn 1.95 O 4 sample is presented. Our study provides an ingenious avenue for regulating the surface optimization and reconstruction of electrode materials .
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产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 34
·2301640
·
IF 13.3
Fan Zhang,Renjie Ji,Xiaoyang Zhu,Hongke Li,Yating Wang,Jingpeng Wang,Fei Wang,Hongbo Lan
Highly active bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) have always been the key factors to affect the performance of zinc–air batteries. However, integrating the independent reaction sites of ORR and OER in a catalyst remains a major challenge. Herein, a collaborative strategy based on defect induction and doping is proposed to prepare the strain-regulated Pt–NiO@Ni sub-micron particles (Pt–NiO@Ni SP). Benefiting from the synergistic effect of tensile strain and Pt-doped, the metallic Ni-based sub-micron particles with tensile strain as the catalyst carriers can effectively optimize the electronic distribution of atomic structures in Pt and NiO on the surface of particles, leading to reduce the energy barrier of intermediates for ORR and OER. Consequently, the Pt–NiO@Ni SP exhibits outstanding bifunctional catalytic activity with the ΔE index of 0.65 V under a low Pt loading, outperforming that of the benchmark Pt/C+IrO 2 catalysts (0.76 V). Impressively, the Pt–NiO@Ni SP-based liquid zinc–air battery develops a high open-circuit potential (1.47 V), excellent energy density (188.2 mW cm −2 ), and favorable cyclic charge–discharge cycling durability (200 h at 20 mA cm −2 ). This work provides an innovative avenue for the rational construction of highly active bifunctional electrocatalysts for practical applications.
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiaorui Yang,Jihui Wang,Zexing Ren,Wenbin Hu
The nickel-ferric layered double hydroxides (NiFe-LDHs) film which are commonly used as catalysts was fabricated on Q235 steel in-situ via two-step hydrothermal method . And the superhydrophobic NiFe-LDH-PFDTES film was obtained by 1 H, 1 H, 2 H, 2 H-perfluorodecyltriethoxysilane (PFDTES) modification. To a certain extent, the application of NiFe-LDHs has been broadened. The structure and composition of NiFe-LDHs film and NiFe-LDH-PFDTES film were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), and Fourier transform infrared (FT-IR). The wettability of films was analyzed by water contact angle testing. And the corrosion resistance of NiFe-LDHs and NiFe-LDH-PFDTES film in 3.5 wt% NaCl solution were measured by using potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS) techniques. The results show that NiFe-LDHs and NiFe-LDH-PFDTES film were successfully prepared on the surface of Q235 steel. By adjusting the preparation conditions, the NiFe-LDH-PFDTES film with optimal corrosion resistance was prepared in the condition containing the hydrothermal solution concentration is 1 unit and hydrothermal time for 6 h. The hydrophobicity changes little with the hydrothermal parameters, and all reach the state of superhydrophobic, the contact angle is greater than 150°, the sliding angle is less than 1°. For the superhydrophobic film, NiFe-LDHs has excellent synergy with PFDTES, covering of an "air film" on the rough structure of LDHs, blocking the solution from contact with the substrate, thereby providing corrosion resistance. NiFe-LDH-PFDTES film exhibits much better corrosion protective performance than NiFe-LDHs film in 3.5 wt% NaCl solution, the impedance modulus is increased about 4–5 orders of magnitude compared with Q235 steel, and the highest protection efficiency can reach 99.99%.
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Qiqi Lu,Xiu-Zhi Wei,Haiyong Wang,Qi zhang,Xinghua Zhang,Lungang Chen,Jianguo Liu,Longlong Ma
The selective hydrogenation of nitrile represents an atom-economical and reliable method to synthesize primary amine, a privileged compound in chemistry, biology, and medicine. However, this approach often displays severe selectivity issues, and additives or reducing agents are generally required to solve this problem. In this work, we aim to synthesize primary amine on a green catalytic system and probe into the catalytic mechanism of Pd-Ni interaction using benzonitrile (BN) as a model compound. The nitrile hydrogenation reaction was catalyzed by bimetallic Pd-Ni oxide nanospecies confined in Silicalite‑1 (S-1) zeolite using H 2 as hydrogen donor without any additive which was environmentally friendly and economic. A 92% yield of benzylamine (BA) was achieved on the [email protected] catalyst with a turnover number (TON) of 1667, and such BA yield was still maintained in upscaling experiment. Detailed characterizations shed light on the mechanism of the extraordinary performance of Pd-Ni oxide nanospecies on base-free nitrile hydrogenation.
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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）