ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Guangfu Qian,Jinli Chen,Lin Luo,Tianqi Yu,Yamei Wang,Wenjie Jiang,Qinglian Xu,Shouquan Feng,Shibin Yin
Developing a highly effective and durable bifunctional non-noble catalyst is necessary for water electrolysis. In this work, we synthesize the N-doped carbon-coated Ni–MoO2 nanowire heterostructure catalyst anchored on nickel foam for boosting the hydrogen and oxygen evolution reaction (HER and OER). Electrochemical results indicate that it exhibits low overpotentials for HER (50 and 304 mV) and OER (240 and 400 mV) at ±10 and ±2000 mA cm–2. Furthermore, it can keep for 340 h under a multicurrent-process condition (10–1500 mA cm–2) as a cathode and anode without obvious attenuation. The outstanding performance could be ascribed to the heterostructure existing in Ni and MoO2, N-doped-carbon coating structure, and nanowire architecture anchored on nickel foam. This work could provide an industrially promising, cheap, and green method for hydrogen production.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Lianbo Wang,Shilong Xing,Huabing Liu,Chuanhai Jiang,Vincent Ji
In the present work, CeO 2 nanoparticles were extra added into Ni Ti nanocomposite coating to optimize the spatial microstructures and wear properties. Before adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles distributed in forms of cluster in Ni deposits, leading to the spatial inhomogeneity of microstructures like local large grains and residual [200] fiber textures. Correspondingly, the hardness in small-grain regions was up to ~4456 ± 46 MPa, while the hardness in large-grain areas dropped to values as low as ~3493 ± 40 MPa. Besides that, inside pores and jagged surface were observable, confining the wear resistance capacity. The average hardness was ~3814 ± 279 MPa. After extra adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles homogeneously scattered throughout the whole nanocomposite coating, leading to the spatial homogeneity of microstructures and properties. Grain size steadily kept at ~40 nm and the hardness stabilized at ~4326 ± 150 MPa. Inside pores vanished, the surface became smooth, and residual [2 0 0] texture was fractured. Benefiting from the modified spatial microstructures and improved hardness, enhanced wear resistance was achieved.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 20
·6718-6729
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IF 4.174
To Van Nguyen,Le The Son,Vu Van Thuy,Vu Dinh Thao,Masahito Hatsukano,Koichi Higashimine,Shinya Maenosono,Sang-Eun Chun,Tran Viet Thu
We report the synthesis of manganese-doped nickel cobalt oxide (Mn-doped NiCo2O4) nanoparticles (NPs) by an efficient hydrothermal and subsequent calcination route. The material exhibits a homogeneous distribution of the Mn dopant and a battery-type behavior when tested as a supercapacitor electrode material. Mn-doped NiCo2O4 NPs show an excellent specific capacity of 417 C g−1 at a scan rate of 10 mV s−1 and 204.3 C g−1 at a current density of 1 A g−1 in a standard three-electrode configuration, ca. 152–466% higher than that of pristine NiCo2O4 or MnCo2O4. In addition, Mn-doped NiCo2O4 NPs showed an excellent capacitance retention of 99% after 1000 charge–discharge cycles at a current density of 2 A g−1. The symmetric solid-state supercapacitor device assembled using this material delivered an energy density of 0.87 μW h cm−2 at a power density of 25 μW h cm−2 and 0.39 μW h cm−2 at a high power density of 500 μW h cm−2. The cost-effective synthesis and high electrochemical performance suggest that Mn-doped NiCo2O4 is a promising material for supercapacitors.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 18
·22639-22647
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IF 3.056
Ren Qiangqiang,He Limo,Hu Song,Li Hanjian,Li Shanxue,Deng Zengtong,Song Gongxiang,Su Sheng,Wang Yi,Xiang Jun
The formation of highly graphitic phenolic resin chars (GPFCs) during catalytic carbonization at relatively low reaction temperature (1200–1600 °C) using novel Ni-Zn-B alloy catalyst with small amount of addition (5–15%) was systematically studied. Only two kinds of graphites (turbostratic graphite and ordered graphite) can be found in GPFCs after catalytic carbonization with Ni-Zn-B and their proportions were changed with reaction conditions. When Ni-Zn-B was involved at 1200–1600 °C, the phenolic resin char was fully transformed to be graphite, and ordered graphite content increased to 28.42% at 1400 °C, which was also almost twice of ordered graphite content in the char catalyzed by pure Ni. But the order graphite content would decrease due to sintering at higher reaction temperature. The addition of Zn and B can promote nickel-based alloy catalytic action by reducing melt point and accelerating graphitization respectively. It was also found that ordered graphite content could be used as a key evaluation parameter to directly reflect the quality of GPFCs based on detailed characteristics analysis. The model between three reaction conditions (reaction temperature, retention time, catalyst content) and ordered graphite content was built with artificial neural network (ANN), and the prediction accuracy of ANN was high up to 91.48%.
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高影响因子
Materials Research Express
·
2019
·Vol. 7
·期 1
·015007
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IF 1.449
Pengdong Feng,Mao Zhong,Weiwei Zhao
Next generation wearable electronics require stretchable dielectrics. There has been significant effort to characterize and improve the components of dielectric composites for use in these devices. In this work, a new stretchable dielectric material, composited by silver nanoparticles (Ag NPs), nickel nanoparticles (Ni NPs), and polydimethylsiloxane (PDMS), is prepared and characterized. The alternating arrays of Ag NPs groups and Ni NPs groups in the three-dimensional matrix of PDMS function as micro capacitors and prevent current percolation. Compared with PDMS alone, the alternating arrays exhibit a dielectric constant (k) that is increased by 1146% and can reach 35.13, with dielectric loss as low as 0.009. Slightly lower k and larger dielectric loss appear at high frequencies. The material exhibits negative temperature dependence, and the composition ratio affects the dielectric properties. The strain at break is 139.68% and the elastic modulus is as low as 3.57 kPa. By controlling the type, size and dispersion of metal nanoparticles in PDMS matrix, a parallel-plate capacitor with constant capacitance is achieved, demonstrating the dependence of the dielectric constant on the applied strain. Moreover, by replacing the parallel plates with cylindrical fibers, a capacitive strain sensor was demonstrated. After hundreds of stretching-releasing cycles, the dielectrics work normally. The excellent properties of this material suggest its significant potential for use in wearable electronics.
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CHEMOSPHERE
·
2019
·
IF 5.108
Xinying Zhang,Chang Su,Xiaoyan Liu,Zhenguo Liu,Xia Liang,Yanming Zhang,Yuwei Feng
The aim of this study was to investigate whether the plant-growth-promoting rhizobacteria (PGPR) could enhance phytoremediation efficiency of Scirpus triqueter ( S.triqueter ) in the pyrene-Ni co-contaminated soil. We also expected to reveal the possible mechanism for the affected phytoremediation efficiency induced by PGPR. We used three kinds of contaminated soils (Ni-contaminated soil, pyrene-contaminated soil and pyrene-Ni co-contaminated soil) to conduct this pot study. After harvest, plants growth indicators, polyphenol oxidase (PPO) activity and soil microbial community structure of each treatment were investigated to explain the different dissipation rates of pyrene and removal rates of Ni between treatments with and without PGPR. The results showed that PGPR-inoculated S. triqueter increased dissipation rates of pyrene and removal rates of Ni in all three contaminated soils, among which Ni removal rates in Ni single contaminated soil was elevated most significantly, from 0.895‰ to 8.8‰, increasing nearly 9 folds. However, Ni removal rate efficiency in co-contaminated soil was weakened because more toxic and complicated co-contaminated soil restrained plant growth and Ni absorption. We also observed that co-contamination harmed the soil microbial community more severely than that in single pyrene or Ni contaminated soil through phospholipid fatty acids analysis. Furthermore, dissipation rates of pyrene and removal rates of Ni were found positively correlated to the PPO activity and the abundance of branched and saturated fatty acids reflected by Pearson correlation analysis.
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高影响因子
CIRP Journal of Manufacturing Science and Technology
·
2022
·
IF 3.56
Meng Guo,Guangjing Huang,Lixia Xi,Donghuai Dai,Dongdong Gu
Laser directed energy deposition (LDED) additive manufacturing is promising in the fabrication of high-performance W-based heavy-alloys which are normally difficult-to-process due to their unique nature such as the extremely high melting point and high ductile-brittle transition temperature. In this work, a novel 95 W heavy alloy modified by nanosized Ni and Fe particles was manufactured by LDED process. The effects of laser power on the formation mechanisms of molten pool were investigated. It was found that a relatively high laser power could promote the complete melting of W powder and formation of regular molten pool morphology. The microstructures of laser-processed W heavy alloy showed columnar grains , cellular grains and equiaxed grains from bottom to top within the molten pool along the building direction. The three-dimensional finite element simulation revealed the temperature gradient ( G ), cooling rate ( C ) and solidification velocity ( S ) within the molten pool were different, which was responsible for the microstructural development. The bulk-form 95 W heavy-alloy part free of defects was produced at the laser power of 1400 W. The optimally processed 95 W heavy-alloy by LDED showed a high average nanohardness of 8.6 GPa and a sound wear performance with a low coefficient of friction (COF) of 0.5. The tensile tests also revealed the achievement of a combination of an excellent tensile strength of 541 MPa and an elongation of 0.99%. This work demonstrated that LDED was able to manufacture high-performance tungsten heavy-alloys in bulk form with outstanding mechanical properties .
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xin Fan,Dayi Zhou,Yaqi Chen,Xinjian Li,Shan Gao,Wenting Ji,Yuewen Zhang,Qi Chen,Hongan Ma,Xiaopeng Jia
Compared to Te, Ni is found in abundance in the earth's crust. At the same time, the mechanical properties of Ni atom-substituted skutterudite are significantly improved. In this study, a series of S-filled Ni-substituted skutterudite compounds were synthesized by a high-pressure and high-temperature (HPHT) method in the synthesis pressure range of 1.0–3.0 GPa. The phase composition, microscopic morphology, and electrothermal transmission properties of the S x Co 3.6 Ni 0.4 Sb 12 ( x = 0, 0.05, 0.10, 0.20) samples were systematically characterized. Phase composition analysis showed that the introduction of S atoms into the intrinsic pores of skutterudite can improve the solid solution limit of Ni atoms in the Co sites of skutterudite. The filling limit of S increased with the synthetic pressure. Moreover, microscopic morphology analysis revealed that the filling of S atoms inhibited the growth of grains. A large number of lattice fringes in different directions were found in the sample, containing abundant microstructures such as lattice distortions and dislocation defects. Compared with the synthesized samples, S 0.05 Co 3.6 Ni 0.4 Sb 12 synthesized at 1.0 GPa had a maximum room temperature power factor of 7.98 × 10 −4 Wm −1 K −2 . The electrical properties of S 0.05 Co 3.6 Ni 0.4 Sb 12 samples stored for 6 months without any protective measures were tested at room temperature. No obvious changes in performance were observed, which proved that the HPHT method can synthesize stable samples. After several thermal cycles, the electrical properties of the S 0.05 Co 3.6 Ni 0.4 Sb 12 sample was tested for variable temperature, and it was found that the sample still had good stability. How the substitution of S atoms with Ni atoms reduces the lattice thermal conductivity can be explained by fitting the Callaway model. The S 0.05 Co 3.6 Ni 0.4 Sb 12 sample synthesized at 1.0 GPa had a maximum zT value of 0.46 at the test temperature of 773 K, which decreased to 0.43 after multiple thermal cycles at the same temperature.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Junyu Gao,Hongqin Ma,Xinyue Luo,Luqi Yu,Xingpeng Gu,Jiahao Liu
Rational design of low-cost and highly-efficient electrocatalysts is vital for water electrolysis. To date, many works have proved that the electrocatalytic hydrogen evolution reaction (HER) activity of the transition metal chalcogenides (TMCs) can be enhanced by anion or cation doping. However, the effect of anion-cation dual-doping on improving the HER activity of TMCs catalysts is still questionable. Herein, we designed and synthesized a porous (Mo, N)-NiSe 2 /Nickel foam (NF) nanosheets array by simultaneous doping Mo and N into pyrite-type NiSe 2 . For (Mo, N)-NiSe 2 /NF, the incorporation of Mo could significantly increase the specific surface area and active sites of NiSe 2 catalyst, whereas N doping was primarily responsible for accelerating the intrinsic reaction kinetics as well as introducing new reactive sites of catalyst. As a result, the porous (Mo, N)-NiSe 2 /NF nanosheets array exhibited a low overpotential of 82 mV at 10 mA.cm −2 , a small Tafel slope of 84.5 mV.dec −1 , and a high C dl of 90.5 mF.cm −2 for HER. Furthermore, the results of “post-HER” XRD , HR-TEM, SEM and XPS demonstrated that the structure, composition and morphology of (Mo, N)-NiSe 2 /NF remained unchanged after 35 h constant current test. This work highlighted the importance of anion-cation dual-doping in boosting electrocatalytic HER activity of TMCs catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Bing Leng,Feng Gao,Yaozu Jia,Xianbo Yu,Mingyi Zhang,Hong Gao,Junpeng Xiao,Peng Yu,Jing Yao
Corrosion engineering constructs MoO 4 2− -intercalated NiFe-LDH electrocatalyst for stable and efficient seawater splitting. • MoO 4 2− intercalation enhances the M-O covalency. • The MoO 4 2− intercalation promotes the formation of high-valent Ni 3+ and Ni 4+ active species. • The hard Lewis acid MoO 4 2− has strong selectivity toward OH − , avoiding the competitiveness of Cl − in seawater. • The MoO 4 2− -intercalated NiFe-LDH electrocatalyst relies on the synergistic catalytic mechanism of AEM and LOM. Undesirable adverse reactions caused by chloride ions (Cl − ) and the corrosion of active sites are obstacles to the oxygen evolution reaction (OER) in seawater splitting. Herein, we design a molybdate anion (MoO 4 2− )-intercalated NiFe-layered double hydroxide (NiFe-LDH) electrocatalyst and demonstrate that the introduction of MoO 4 2− generates more abundant oxygen vacancies, enhances the M-O covalency, and accelerates the formation of nickel (III) ion (Ni 3+ ) and further oxidation to nickel (IV) ion (Ni 4+ ). Meanwhile, the hard Lewis acid MoO 4 2− exhibits strong selectivity toward OH − , avoiding the competitiveness and corrosiveness of Cl − in seawater. The intercalation of MoO 4 2− modulates the electronic structure of nickel (Ni) and iron (Fe) active sites, optimizing the adsorbate evolution mechanism (AEM) pathway. Simultaneously, moderate activation of lattice oxygen favors the lattice oxygen evolution mechanism (LOM) pathway, facilitating a delicate balance between the AEM and LOM. In a 1.0 M KOH + 0.5 M NaCl electrolyte, the catalyst shows an overpotential of only 224 mV at a current density of 50 mA cm −2 and can operate stably for 1500 h. This work provides a simple and effective method for preparing high-efficiency OER catalysts through corrosion strategies, which can be widely applied to seawater electrolysis. Molybdate anion(MoO 4 2− ) can inhibit the corrosive damage of chloride ions (Cl − ) on the surface of NiFe-LDH catalysts, inducing beneficial surface reconstruction of MoO 4 2− /NiFe-LDH to generate a large number of oxygen evolution active sites,significantly reducing the reaction overpotential, enabling the catalyst to exhibit ultra-long electrocatalytic durability exceeding 1500 h at a high current of 1000 mA cm −2 . Download: Download high-res image (277KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Tiantian Liu,Xiaomei Yu,Shuang Yu,Huijing Yang,Qimeng Sun,Chengduo Wang,Songjie Li,Jin You Zheng
Alkaline water electrolysis techniques have enormous potential for industrial-scale hydrogen generation, but a lack of effective and low-cost bifunctional electrocatalysts capable of steady high-current density operation has hampered progress. Layered double hydroxides (LDHs) have been considered promising OER electrocatalysts, but their poor electrical conductivity impedes hydrogen evolution reaction (HER) activity. Integrating LDHs with transition metal phosphides (TMPs) can potentially achieve bifunctional capability by overcoming individual limitations. Herein, CoP@NiFe LDH/Ni heterostructured catalyst was rapidly synthesized by a scalable two-step electrodeposition method. The integration of NiFe LDH with CoP enhanced its electrical conductivity. Meanwhile, electron transfer occurred from the metal atoms to the more electronegative phosphorus, facilitating phosphorus to act as a proton acceptor and expedite the HER process. Benefiting from the synergistic integration and optimized electronic structure, CoP@NiFe LDH/Ni exhibited excellent alkaline water-splitting performances with low overpotentials of 260 mV for HER and 351 mV for OER at 400 mA/cm 2 . The CoP@NiFe LDH/Ni two-electrode-based alkaline electrolyzer displayed a cell voltage of 2.13 V and stable operation for 100 h at a high current density of 1000 mA/cm 2 . This work elucidates a strategy to tackle critical challenges impeding the design and preparation of high-current-density tolerant bifunctional electrocatalysts.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Xiao-Hui Wang,Rou Yuan,Shi-Bin Yin,Qing-Ling Hong,Quan-Guo Zhai,Yu-Cheng Jiang,Yu Chen,Shu-Ni Li
Nitrite (NO 2 − ) and hydrazine (N 2 H 4 ) are common N-pollutants in groundwater. The electrochemical method can realize the treatment of N-pollutants and the synthesis of energy substance ammonia (NH 3 ). Designing and synthesizing efficient electrocatalysts is of great significance. Herein, ultrathin Co 0.5 NiS nanosheets attached on nickel foam (Co 0.5 NiS-NSs/NF) are synthesized via cyanogel-NaBH 4 hydrolysis process and succedent sulfurization approach. Owing to the ultrathin nanosheet structure and the interaction between Ni and Co, Co 0.5 NiS-NSs/NF exhibits high activity for NO 2 − reduction reaction (NO 2 − RR), in which the Faraday efficiency is 92.2% and the NH 3 yield is 0.25 mmol h −1 cm −2 at −0.15 V potential. Meanwhile, Co 0.5 NiS-NSs/NF also displays remarkable activity for N 2 H 4 oxidation reaction in KOH electrolyte. Therefore, a symmetrical Co 0.5 NiS-NSs/NF||Co 0.5 NiS-NSs/NF electrolyzer is assembled, which only needs the operating voltage of 0.36 V to reach 10 mA cm −2 for NO 2 − -to-NH 3 conversion in the presence of N 2 H 4 . This work reports a promising and efficient strategy for NH 3 production at a small operating voltage and treatment of the N-pollutants.
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危险品化学品经营许可证（带存储）