JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Daosong Zha,Yongsheng Fu,Lili Zhang,Junwu Zhu,Xin Wang
Nickel cobalt sulfides (NiCo-S) are promising electrode materials for high-performance supercapacitors but normally show poor rate capability and unsatisfactory long-term endurance. To overcome these disadvantages, a properly constructed electrode architecture with abundant electron transport channels, excellent electronic conductivity and robust structural stability is required. Herein, considering that in situ transformation can mostly retain the specific structural advantages of the precursors, a two-step strategy is purposefully developed to construct a binder-free electrode composed of interconnected NiCo-S nanosheets on Ni foam (NiCo-S/NF), in which NiCo-S/NF is synthesized via the in situ sulfuration of networked acetate anion-intercalated nickel cobalt layered double hydroxide nanosheets loaded on Ni foam (A-NiCo-LDH/NF). Noticeably, the optimized Ni 1 Co 1 -S/NF exhibits an ultrahigh specific capacitance of 2553.9 F g −1 at 0.5 A g −1 , excellent rate capability (1898.1 F g −1 at 50 A g −1 ) and superior cycling stability (nearly 90% capacitance retention after 10,000 cycles). Furthermore, the assembled asymmetric supercapacitor based on Ni 1 Co 1 -S/NF demonstrates a high energy density of 58.1 Wh kg −1 at a power density of 796 W kg −1 and impressive long-term durability even after a repeated charge/discharge process as long as 70,000 cycles (∼92% capacitance retention). The attractive properties endow the Ni 1 Co 1 -S/NF electrode with significant potential for high-performance energy storage devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xincheng Jiang,Junyi Jiang,Guoyou Huo,Jiaxi Guo,Qiquan Zheng,Hong Li,Huaili Zheng
Effectively removing both soluble antibiotics and insoluble oils from wastewater is a significant challenge. To address both the problems, we synthesized a three-dimensional (3D) porous water treatment material. It can be converted from antibiotic removal mode to oil removal mode by simple surface performance regulation. This approach achieved a high removal rate for ciprofloxacin (CIP) and good separation efficiency for oil/water mixtures. Initially, Co 2 CO 3 (OH) 2 nano-needles were fixed on Ni foam to synthesize Co 2 CO 3 (OH) 2 @Ni foam-1, which had a high CIP removal rate (93.59 % at pH 7.0) and a certain anti-interference ability. To assess the CIP removal performance, the environmental impact, economic benefit and energy consumption (3E) triangle model was established and the optimal operating point was selected. Characterization experiments demonstrated that the removal of CIP was attributed to the mechanisms of surface complexation, electrostatic attraction, cation bridging, precipitation and flocculation . Subsequently, Co 2 CO 3 (OH) 2 @Ni foam-2 was obtained by hydrophobic modification, which exhibited separation efficiencies above 93.5 % for a series of different oil/water mixtures. Co 2 CO 3 (OH) 2 @Ni foam series materials are easy to prepare and possess effective pollutants treatment efficiency, thus providing a new strategy for developing multi-functional water treatment materials and a novel approach for the treatment of soluble antibiotics and insoluble oils in wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Haibin Wang,Xiaoqiang Du,Xiaoshuang Zhang,Lu Li
Electrocatalytic water splitting has become one of the most promising and effective ways to solve energy crises and environmental pollution. In this work, a series of M-doped Co 3 O 4 materials with foreign ions (M = Ce, Ni and Fe) were grown on a Ni foam substrate through classical hydrothermal and calcination methods. It is worth noting that not all doping of foreign ions can promote the electrocatalytic performance of intrinsic materials. The Ce-doped Co 3 O 4 material shows excellent oxidation properties of water (overpotential of 320 mV at 50 mA cm −2 ) and urea (potential of 1.39 V at 50 mA cm −2 ). However, the doping of Ni reduces the water oxidation performance of the intrinsic material (overpotential of 410 mV@ 50 mA cm −2 ), and the doping of Fe reduces the urea oxidation performance of the inherent material (potential of 1.45 V@ 50 mA cm −2 ). A series of experimental results indicate that the improved activity of the Ce-Co 3 O 4 electrode is attributed to faster electron transport capacity, higher exposure to active sites, and improved conductivity due to doping of Ce. It is noteworthy that the doping of these ions does alter the rate-determination step for the water oxidation reaction. The stability test demonstrated that the current density of water oxidation and urea oxidation of the catalyst had no significant attenuation after a long electrocatalytic activity test. This work provides a new idea for improving the electrocatalytic activity of catalysts by a doping strategy.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zekai Mu,Xianglei Liu,Hang Shi,Chao Song,Chunzhuo Dang,Ke Gao,Nan Sun,Cheng Tian,Hangbin Zheng,Xinrui Wang,Yimin Xuan
By converting two greenhouse gases into fuels, CO 2 reforming of CH 4 via free and clean solar energy is a promising solution to the energy shortage and global warming problems simultaneously. However, serious challenges such as limited light-to-fuel efficiency, severe catalyst aggregation, and deactivation still exist for reactors employing traditional catalyst powders. Here, Ni/MgAlO x -LDH catalysts loaded Ni foam reactor with heat recovery is proposed for highly efficient and stable CO 2 reforming under direct concentrated solar irradiation. The temperature nonuniformity is reduced by 84.3% compared to powdered systems, which benefits from the high thermal conductivity of nickel foams. Overheating is also prevented, which leads to much less carbon deposition and relieved active sites aggregation. Ultrahigh light-to-fuel efficiency of 36.51% is achieved, which is much higher than that of traditional powdered systems (23.87%). Numerical simulation results have an excellent agreement with experiments and demonstrate that heat recovery can greatly improve CRM rates by 23.8%. This work opens new routes to achieve highly efficient, stable, and scalable solar-driven CO 2 reforming via Ni/MgAlO x -LDH catalysts loaded Ni foam reactors with heat recovery.
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JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Yapeng Tian,Chenhui Yang,Wenxiu Que,Yucheng He,Xiaobin Liu,Yangyang Luo,Xingtian Yin,Ling Bing Kong
Supercapacitor , as an important energy storage device, is a critical component for next generation electric power system , due to its high power density and long cycle life. In this study, a novel electrode material with quasi-core-shell structure, consisting of negatively charged few layer Ti 3 C 2 nanosheets (FL-Ti 3 C 2 ) and positively charged polyethyleneimine as building blocks, has been prepared by using an electrostatic layer-by-layer self-assembly method, with highly conductive Ni foam to be used as the skeleton. The unique quasi-core-shell structured ultrathin Ti 3 C 2 nanosheets provide an excellent electron channel , ion transport channel and large effective contact area, thus leading to a great improvement in electrochemical performance of the material. The specific capacitance of the binder-free FL-Ti 3 C 2 @Ni foam electrodes reaches 370 F g −1 at the scan rate of 2 mV s −1 and a specific capacitance of 117 F g −1 is obtained even at the scan rate of 1000 mV s −1 in the electrolyte of Li 2 SO 4 , indicating a high rate performance. In addition, this electrode shows a long-term cyclic stability with a loss of only 13.7% after 10,000 circles. Furthermore, quantitative analysis has been conducted to ensure the relationship between the capacitive contribution and the rate performance of the as-fabricated electrode.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 14
·4476-4490
·
IF 4.174
Keyu Tao,Lian Wang,Yang Hai,Yun Gong
P–TiOn–VOm nanowires were grown on nickel foam (NF) via a one-pot hydrothermal method and by further vapor deposition/phosphorization method. It was found that low valence states of titanium oxide and deficient-oxygen coexist in P–TiOn–VOm/NF. Furthermore, (TiO1.25)3.07 (denoted as TiOn) and VO (denoted as VOm) possess similar structures and matched facets, and their epitaxial growth leads to the formation of TiOn/VOm heterostructure with a formation energy of −1.59 eV. P–TiOn–VOm/NF possesses good electron conductivity and electrons can be transferred from Ti to V centers, as evidenced by the DFT calculations and the XPS spectra. As a result, the specific capacity of P–TiOn–VOm/NF can reach 785 C g−1 at 1 A g−1 in the potential range of 0–0.55 V vs. Hg/HgO, which is much larger than those of VOm/NF, P–VOm/NF, and P–TiO2–VOm/NF. On the other hand, the TiOn/VOm heterostructure also favors the separation and transfer of photoinduced electrons and holes, and P–TiOn–VOm/NF exhibits visible-light-driven photoresponse. Under visible light illumination, the specific capacity of P–TiOn–VOm/NF is increased by 6.2% relative to that in the dark. Furthermore, the P–TiOn–VOm/NF//activated carbon (AC) asymmetric supercapacitor (ASC) shows an energy density of 37.2 W h kg−1 at a power density of 1 kW kg−1 and excellent cycling performance with 93.6% capacity retention after 10 000 cycles at 5 A g−1, which is comparable to and even superior to those of titanium oxides and vanadium oxides. A promising achievement has been proposed to improve the energy storage performance of P–TiOn–VOm through P-functionalization and O-deficiency in this work.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Tao-Long Wu,Xiu-Niang Tan,Tian-Tian Nong,Yu-Jie Pan,Peng-Fei Qiu,Jia-Qi He,Yan Zhou,Xue-Cai Tan,Zai-Yin Huang,Lei Han
Owing to the high specific surface area, rich active sites, well-controlled morphology and structural stability with tunable compositional components, the rational combination of hybrid nanostructured materials from metal-organic frameworks templates has become highly attractive and still of great challenge for supercapacitors. In this work, three bimetallic metal–organic frameworks Co 1-x Fe x -MOF-74/NF ( x = 0.25, 0.5 and 0.75 ) nanoarrays with different proportional Co/Fe ratios on nickel foam have been successfully designed and fabricated via in-situ interfacial growth method, which were further controllable converted to α-Co(OH) 2 /CoFe 2 O 4 nanoarrays with different proportional Co/Fe ratios CF-x/NF ( x = 0.25, 0.5 and 0.75 ) without structure collapse through alkaline etching process. Among them, the transformation of the bamboo-shoot-like CF-0.75/NF electrode displays excellent electrochemical properties with high area capacitance (3941.14 mF/cm 2 at 2 mA/cm 2 ), good rate capability, low resistances and remarkable cycling stability. The CF-0.75//AC ASC device delivers a high energy density of 0.16 mWh/cm 2 at a power density of 0.756.1 mW/cm 2 . And this CF-0.75//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This strategy could be extend to form other unique bimetallic hybrids nanoarrays architectures with enhanced electrochemical activity for high-performance energy storage devices.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jiawei Guo,Zhuojun Wei,Kun Wang,Hui Zhang
Novel CoFe-LDH (layered double hydroxide) nanosheet arrays in situ grown on rGO (reduced graphene oxide) uniformly modified Ni foam were synthesized by a citric acid-assisted aqueous phase coprecipitation strategy. Systematic characterizations indicates that the series of Co x Fe 1 -LDH/rGO/NF (x = 4, 3, 2) all show Co x Fe 1 -LDH nanosheets (150–180 × 15 nm) grown vertically on the surface of rGO/NF. Especially, the Co 3 Fe 1 -LDH/rGO/NF exhibits the best performance with overpotentials of 250 and 110 mV at 10 mA cm −2 in 1 M KOH for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When it is used as cathode and anode simultaneously for overall water splitting, they require 1.65 and 1.84 V at 10 and 100 mA cm −2 , respectively. Excellent performance of Co 3 Fe 1 -LDH/rGO/NF is due to the nanosheet arrays structure with open channels, synergistic coupling between Co 3 Fe 1 -LDH and rGO enhancing electrical conductivity , and in-situ growth of Co 3 Fe 1 -LDH on rGO/NF enhancing stability.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanhong Wang,Nannan Chen,Xiaoqiang Du,Xinghua Han,Xiaoshuang Zhang
Electrolysis of water is an environmentally friendly and promising hydrogen generation technology, which is one of the best ways to deal with the global energy crisis and environmental pollution. However, the slow anode reaction of water electrolysis is the bottleneck of limiting the efficient hydrogen production. Therefore, it is a key problem to explore an efficient and economical electrocatalyst to assist the anode reaction. Herein, a series of self-supporting M-NiCo 2 S 4 /Ni 3 S 2 (M=Mn, Fe, Cu, Zn) nanostructures grown on a nickel foam (NF) skeleton were prepared through one-step hydrothermal strategy. In this process, doping engineering is employed to adjust the electronic structure of catalyst and improve the performance of the catalyst. Among them, the introduction of Fe not only greatly changed the morphology, but also provided rich active sites. Specifically, the Fe-NiCo 2 S 4 /Ni 3 S 2 electrode can achieve current densities of 50 and 100 mA cm −2 at overpotential of 159 and 210 mV in alkaline media for oxygen evolution reaction (OER). In addition, driving current densities of 50 and 100 mA cm −2 in 1.0 M KOH with 0.5 M urea only requires the ultra-small voltage of 1.37 and 1.39 V (vs. RHE) for urea oxidation reaction (UOR), indicating that UOR can well replace OER to reduce electrical energy consumption. The experimental results and density functional theory calculations (DFT) demonstrate that the superior activity of the catalyst can be attributed to the optimal water adsorption energy, faster electron transfer rate, more active site exposure and good electrical conductivity . This work extends the application of doping engineering in water electrolysis and provides a novel preparation method of efficient catalyst for OER and UOR.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Zheng Yi,Qigang Han,Yong Cheng,Fangxue Wang,Yaoming Wu,Limin Wang
A simple and inexpensive route is developed to synthesis the Sb thin film sandwiched between the reduced graphene oxide and the Ni foam (RGO-Sb TF -Ni) by a galvanic replacement reaction along with a pulse electrophoretic deposition route. As a binder-free anode material for lithium ion batteries , the RGO-Sb TF -Ni exhibits a high initial discharge capacity of 872.9 mA h g −1 and an enhanced coulombic efficiency of 66.0% at a current density of 100 mA g −1 in the first cycle. In addition, a substantial discharge capacity of 424.1 mA h g −1 can be retained even after 50 repeated cycles. The enhanced performances of the designed binder-free anode material can be attributed to the novel hierarchical sandwich laminated structure with an excellent electrical contact, and the synergistic effect between the Sb thin film with high specific capacity and flexible RGO with good buffer effect to alleviate the strain caused by the large volume change.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wei Wen,Xiaoqiang Du,Xiaoshuang Zhang
Replacing fossil fuels by electrocatalytic water splitting for producing hydrogen and oxygen is one of the most promising ways to solve the energy crisis and environmental pollution. In this work, a series of M doped N-Ni 3 S 2 (M = Cu, Fe, Co and Ce) material was firstly synthesized and in situ grown on nickel foam substrate by a typical two-step hydrothermal synthesis method. Two probe reactions, water oxidation and urea oxidation, were selected to investigate the catalytic performance of these materials. What is noteworthy is that the Fe doped N-Ni 3 S 2 material exhibits superior water oxidation properties with requiring only 270 mV of overpotentials to drive current densities of 100 mA cm −2 , which is one of the best activities reported so far. After a long time of durability measurement, the current density of the Fe doped N-Ni 3 S 2 material will be attenuated, suggesting that the surface of the material will be in situ oxidized to oxide or hydroxide, which is the true active species. For urea oxidation, the Co doped N-Ni 3 S 2 material shows superior catalytic performance with requiring only 1.36 V potentials to drive 100 mA cm −2 current densities. Density functional theory (DFT) calculation shows that different adsorption energy of water for N-Ni 3 S 2 , N-Cu-Ni 3 S 2 , N-Fe-Ni 3 S 2 and N-Co-Ni 3 S 2 leads to the different catalytic activity. Experimental results demonstrate that the improved catalytic performance is assigned to faster electron transfer rates, exposure of abundant active center and better conductivity due to N and cation doping. This work provides new lessons for doping engineering for water splitting reactions.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 47
·17774-17784
·
IF 4.39
Fangfang Wang,Zihao Liu,Kuanjian Zhang,Qingqing Zha,Yonghong Ni
Developing active, durable, and inexpensive electrocatalysts for the oxygen evolution reaction (OER) is drawing increased interest. Here, a mild hydrothermal–electrodeposition two-step route is designed for the preparation of Ce-doped Ni–S@NiMoO4 micropillar composites on nickel foam (CeNiS@NiMoO4/NF). The as-constructed CeNiS@NiMoO4/NF electrode shows an ultralow overpotential, fast kinetics, superb intrinsic activity and excellent long-term stability for the OER. In 1 M KOH solution, 187 mV overpotential is required to deliver a current density of 10 mA cm−2 with a Tafel slope of 35.28 mV dec−1, and in a saline-alkaline solution of 1 M KOH and 0.5 M NaCl, only 260 mV overpotential is needed to reach 100 mA cm−2, demonstrating its excellent OER performance. The above outstanding electrocatalytic activity is attributed to the influence of CeNiS nanosheets on the surface microstructure of NiMoO4 micropillars, which not only improves the conductivity of the catalyst, but also increases the surface area, as well as accelerates the escape of gases produced. Compared with other non-precious metal OER electrocatalysts, the as-prepared CeNiS@NiMoO4/NF presents stronger or close electrocatalytic activity and better durability, which provides a new electrocatalyst selection in practical applications.
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