JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Xuefei Gong,J.P. Cheng,Fu Liu,Li Zhang,Xiaobin Zhang
Nickel–Cobalt hydroxide microspheres are electrodepositioned on the films of NiCo 2 O 4 nanowires grown on the current collector through a facile approach and the hierarchical structures are then investigated as an electrode material for high-performance supercapacitors . Owing to the superior electrical conductivity of NiCo 2 O 4 nanowires, the porous structure of the (Ni–Co)(OH) 2 microspheres and the synergic effect of the multi-components, the electrode can deliver a high areal capacitance of 6 F cm −2 and a corresponding specific capacitance of 1132 F g −1 at a current density of 2 mA cm −2 , as well as a good rate capability (61.8% capacitance retention from 2 mA cm −2 to 50 mA cm −2 ), and excellent cycling stability (90% capacitance retention after 2000 cycles). The results suggest that our research opens up the possibility for the fabrication of high-performance energy-storage devices of binder-free electrodes.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaobo Yang,Shuang Liang,Guanzhihui Wang,Bao Zhou,Zhuoqi Duan,Zaixin Xie,Yongmao Hu
Developing oxygen evolution reaction (OER) electrocatalysts with high efficiency, low cost and good stability for water splitting is significant to relieve the energy crisis and environmental pollution. Herein, NiCo alloy (NC) nanoparticles (NPs) embedded N-doped carbon fibers (NCF) were prepared by electrospinning and carbonization. The surfaces of the NC@NCF were anchored with nanocrystalline NiCo 2 S 4 (NCS) in a following solvothermal process to form NCS-NC@NCF composite. Synergistic effect of the alloy (NC) and the semiconductor (NCS) was successfully stimulated, i.e., rapid charge separation and transfer was achieved during the OER process. In addition, the carbon fibers substrate is beneficial for good dispersion of the NC and NCS NPs as well as the conductivity improvement of the as-prepared NCS-NC@NCF catalyst. The prepared NCS-NC@NCF catalyst electrode owns good OER performances of a low overpotential of 291 mV, 342 mV and 376 mV to respectively deliver current densities of 10 mA cm −2 , 50 mA cm −2 and 100 mA cm −2 , which are respectively 19 mV, 82 mV and 116 mV lower than those of the RuO 2 electrode (310 mV, 424 mV and 492 mV), indicating the great potential of the catalyst in water splitting. Moreover, good durability of current density retention of 90.7 % is observed after 60 h of continuous OER polarization for the catalyst. Additionally, a two-electrode system composed of commercial Pt/C and the NCS-NC@NCF electrodes only needs a driven voltage of 1.51 V to afford 10 mA cm −2 for water splitting, which is superior to that (1.69 V) of the Pt/C||RuO 2 system.
研究领域:
材料科学
·
电化学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 18
·7552-7560
·
IF 3.288
Xiaojuan Feng,Zhongai Hu,Yanlong Shi,Xiaotong Wang,Lijie Hou,Yulong Zhang,Weixia Ma
The exploration and fabrication of highly effective and low cost non-precious electrocatalysts are very essential for the hydrogen production industry. Herein, for the first time we constructed and prepared Ni/CoFe hydroxide and Ni/CoSe2 electrodes with hollow nanotube array structures on conductive nickel foam by a facile two-step electrodeposition method combined with a ZnO self-template strategy. The as-prepared Ni/CoFe hydroxide and Ni/CoSe2 nanotube arrays only need a relatively low overpotential of 230 mV for OER and 89 mV for HER to achieve a current density of 20 mA cm−2 and 10 mA cm−2, respectively. Specifically, an asymmetric alkaline electrolyzer has been assembled by using Ni/CoFe hydroxide as anode and Ni/CoSe2 as cathode, which requires a low overall potential of only 1.57 V at the current density of 10 mA cm−2 and displays excellent stability for 20 h. The excellent electrocatalytic performance of the electrodes benefits from the synergistic effect of the different components and the hierarchical hollow nanotube structure with abundant active sites, fast electronic transport and sufficient diffusion channels for electrolyte and gas. The work provides a feasible way to develop highly efficient, hierarchical, hollow-structured and low-cost earth-abundant catalysts for electrocatalytic water splitting applications.
研究领域:
材料科学
·
电化学
·
能源转换与储存
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yikai Lu,Chenchen Liu,Shengjie Xu,Yu Liu,Deli Jiang,Jianjun Zhu
Designing and synthesizing stable, low-cost, and eco-friendly precious-metal-free electrocatalysts with high performance for hydrogen evolution is a critical and challenging task in the research and development of renewable hydrogen energy. Herein, we show an interfacial engineering strategy to synthesize the NiCoP nanosheets/NiCoP nanocubes homojunction electrocatalyst supported on Ni foam (2D/3D-NiCoP/NF). The as-synthesized 2D/3D-NiCoP/NF catalyst shows impressive HER activity, and a current density of 10 mA cm −2 can be achieved with only an overpotential of 37 mV in 1 M KOH solution. Such impressive HER performance of this 2D/3D-NiCoP/NF homojunction electrocatalyst is principally due to the exposure of abundance accessible active sites originated from the hierarchical structure of nanocubes on the nanosheets. Moreover, the intimate contact between 2D/3D-NiCoP and NF can simultaneously shorten the electron transport pathway and improve its stability. This novel 2D/3D-NiCoP/NF homojunction is expected to provide a powerful interface-engineering reference for the design and construction of high-efficiency synergistic HER electrocatalysts.
研究领域:
材料科学
·
电催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Wenxuan Hu,Lu Chen,Biao Geng,Miao Du,Guorong Shan,Yihu Song,Ziliang Wu,Qiang Zheng
A hierarchical structure, defined as structural features occurring on different levels of scale, is widely used in the rational design of composite electrodes for its superiorities in abundant electrochemical active sites and functional differentiation for various components. Herein, we in situ prepare a nickel–cobalt layered double hydroxide (NiCo-LDH) nanosheet network on ultrathin nickel–cobalt–zinc–sulfide (NiCoZnSx) microplate arrays to construct a special, coral-inspired hierarchical structure. In this structure, NiCoZnSx microplate arrays not only provide plenty of rooms for nanosheet growth but also improve the ion diffusion, charge transfer, and structural stability of the composite electrode. The NiCo-LDH nanosheet network paved through the microplate surface offers a high specific surface area and capacitance. The composite electrode delivers a high specific capacitance of 8.1 F cm–2 (1928 F g–1) at a loading mass of 4.2 mg cm–2, outstanding rate capability (63% capacitance retention, 50 mA cm–2), and cycling stability (80% capacitance retention, 10 000 cycles). Furthermore, the hybrid asymmetric supercapacitor assembled by the composite electrode and active carbon exhibits a maximal power density of 80.3 mW cm–2 at an energy density of 270 μWh cm–2 with good rate capability and cycling stability. This work reveals the significance and practical potential of rational design in the electrode’s hierarchical structure for a high-performance supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yanqin Xue,Qing Yan,Xiaojing Bai,Yanyan Xu,Xuan Zhang,Yiju Li,Kai Zhu,Ke Ye,Jun Yan,Dianxue Cao,Guiling Wang
The development of efficient bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential for reducing the cost of hydrogen production by water splitting. Herein, hollow microtubes composed of RuNi 1 Co 1 alloy nanoparticles uniformly embedded in the carbon matrix (RuNi 1 Co 1 @CMT) are prepared through a simple impregnation followed by reduction. Benefiting from the unique mosaic structure and the synergistic effect between Ru and NiCo, RuNi 1 Co 1 @CMT achieves more exposed active sites and improved reaction kinetics. As a consequence, RuNi 1 Co 1 @CMT exhibits considerable catalytic activities with the overpotentials of 78 mV for HER and 299 mV for OER at 10 mA cm −2 in 1 M KOH. In addition, RuNi 1 Co 1 @CMT exhibits excellent stability for up to 30 h in both HER and OER processes at 20 mA cm −2 , which is attributed to the protection of the RuNi 1 Co 1 alloy particles by the carbon layer. Furthermore, the assembled RuNi 1 Co 1 @CMT || RuNi 1 Co 1 @CMT overall water splitting system shows a cell voltage of 1.58 V at 10 mA cm −2 . The density functional theory (DFT) calculations indicate that the addition of Ru can optimize the hydrogen adsorption free energy of Ni and Co sites. Finally, a solar panel-driven water splitting device is built, which can realize green and sustainable hydrogen production. The fabrication of RuNi 1 Co 1 @CMT provides a new way for the preparation of effective alloy nanomaterials for energy storage and conversion.
研究领域:
材料科学
·
催化化学
·
能源转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2023
·Vol. 13
·期 4
·726
·
IF 3.4
Zhi Lu,Zhihao Zhou,Shilin Li,Guoqing Huang,Tianwen He,Jiaqi Cai,Mingyang Jin,Yiting Li,Xuefeng Zhang,Shuaifang Li,Chong Chen,Guangxin Wang
The design of high-performance and low-cost oxygen evolution reaction (OER) electrocatalysts is crucial for environment friendly hydrogen production. Some transition metals have been proven to be good substitutes for noble metals due to their unique electronic structural characteristics and good electrocatalytic performances, with examples including nickel and cobalt, which are usually used to prepare OER electrocatalysts. In this work, we synthesized three-dimensional Ni-Co-Fe ternary layered double hydroxide nanosheet array electrocatalysts via hydrothermal process. Iron element was introduced into the Ni-Co based hydroxide. The ternary layered double hydroxide has a nanoarrays microstructure. Theoretical analysis confirms that by adjusting the ratio of Ni/Co/Fe, the microstructure of the catalyst changes significantly. Attributed to the special nanostructure, the catalysts show superior catalytic activities in oxygen evolution reaction (OER). The results show that a small overpotential of 222 mV at the current density of 20 mA·cm−2for the OER in 1.0 M KOH is acquired. A small Tafel slope of 61.22 mVdec−1and a maximum specific capacitance of 239 Fg−1are also obtained.Keywords:oxygen evolution reaction;nanoarrays;Ni-Co based;electrocatalyst
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1119
·
IF 3.9
Yinke Zhang,Lu Li,Zihan Shang,Hang Xu
In this study, nickel cobaltate (NiCo2O4) powders are employed as a catalyst in conjunction with persulfate for the development of a catalytic oxidation system to enhance fuel desulfurization. The hydrothermal synthesis conditions of NiCo2O4powders, which significantly influenced the desulfurization efficiency, were optimized using a response surface methodology with a Box–Behnken design. These conditions were ranked in the following order: calcination temperature > hydrothermal temperature > calcination time > hydrothermal time. Through the optimization process, the ideal preparation conditions were determined as follows: a hydrothermal temperature of 143 °C, hydrothermal time of 6.1 h, calcination temperature of 330 °C, and calcination time of 3.7 h. Under these optimized conditions, the predicted desulfurization rate was approximately 85.8%. The experimental results closely matched the prediction, yielding a desulfurization rate of around 84%, with a minimal error of only 2.1%. To characterize the NiCo2O4powders prepared under the optimal conditions, XRD, SEM, and TEM analyses were conducted. The analysis revealed that the microscopic morphology of NiCo2O4exhibited a rectangular sheet structure, with an average particle size of 20 nm. Additionally, fan-shaped NiCo2O4particles were observed as a result of linear and bundle agglomerations. Thus, this work is innovative in its ability to synthesize nano-catalysts using hydrothermal synthesis in a controllable manner and establishing a correlation between the hydrothermal synthesis conditions and catalytic activity.Keywords:response surface methodology;hydrothermal synthesis;nickel cobaltate;desulfurization;optimization
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Shifa Zhong,Yuanyuan Sun,Hongchuan Xin,Chunpeng Yang,Lei Chen,Xuebing Li
LaNi 1 − x Co x O 3 ( x = 0, 0.1, 0.3, 0.7, 1.0) perovskite catalysts were prepared by co-precipitation method and investigated in the catalytic oxidation of NO. LaNi 0.7 Co 0.3 O 3 showed the best catalytic activity among all the samples, confirming the potential of LaNi 0.7 Co 0.3 O 3 as a cheap and efficient NO oxidation catalyst. The high reactivity of LaNi 0.7 Co 0.3 O 3 was mainly due to the moderate amount of adsorbed NO and O 2 and their moderate adsorption strength on the surface of the catalyst, as determined by the XRD, H 2 -TPR, NO-TPD, O 2 -TPD and XPS studies.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Weimin Cao,Zeru Shen,Jiayi Li,Jingyu Li,Yiying Zhao,Qingran Zhang,Qiang Liu
Electrochemical oxidation of glycerol into value-added chemicals represents a sustainable approach for not only valorizing biomass resources but also improving the energy efficiency of electrolysis by replacing the kinetically sluggish oxidation of water at the anode. Here, we present a nickel (oxy)hydroxide supported cobalt nanoneedle arrays catalyst (CoNA-NiOH/NF-2) for effective oxidation of glycerol. The loaded Co(OH) 2 forms more oxygen defects, increases the active sites, and enhances the performance of glycerol oxidation. The CoNA-NiOH/NF-2 catalyst significantly reduces energy consumption by achieving a current density of 10 mA cm −2 at a low voltage of 1.22 V vs. RHE, and 100 mA cm −2 at 1.42 V vs. RHE, which is approximately 240 mV lower than oxygen evolution reaction (OER). Additionally, the Faraday efficiency of formate generation reached 98 %. The growth of renewable energy sources will greatly benefit from this strategy, which calls for replacing anodic OER with biomass oxidation.
研究领域:
化学工程
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kai Shi,Yin Che,Yang Deng,Xia An,Xianmei Xie,Xu Wu
Bimetallic catalysts with unique geometric and electronic structure exhibit high performance compared to that of monometallic counterparts in the ethanol steam reforming (ESR). Herein, NiCo bimetals supported on CeO 2 doped MgAl 2 O 4 (NiCo/CeMgAl) with different ratio of Ni/Co were prepared for ESR. The synergies between Ni and Co in catalytic activities and ability to anti-coking were focused. The results demonstrate Co atoms trend to segregate toward the surface and are oxidized synchronously, forming the Ni-CoO hybrid surface. The reduced Ni particles are beneficial to maintain a stable catalytic activity for the C-C bonds scission, and the CoO particles formed by segregation and irreversible oxidation of Co 0 are more conducive to activation of H 2 O, the resulting OH promotes the transformation of CH x species, which significantly reduces the selectivity of CH 4 and prevents the formation of filamentous carbon. Controlling Co content and maintaining a stable M/M δ+ are critical to balance the C-C bond scission reaction and the CH 3 * conversion reaction on the NiCo bimetallic catalysts. The optimal catalyst 9Ni1Co/CeMgAl shows the ethanol conversion of 93.9 % at TOS of 100 h, and the average rate of coke formation is 0.50 mg c ·g cat -1 ·h −1 .
研究领域:
化学工程
·
催化
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 45
·17441-17453
·
IF 4.569
Yuewen Shao,Mingzhu Guo,Mengjiao Fan,Kai Sun,Guoming Gao,Chao Li,Félix Mérimé Bkangmo Kontchouo,Lijun Zhang,Shu Zhang,Xun Hu
One-pot conversion of furfural, a biomass-derived platform chemical, to gamma-valerolactone (GVL), a fuel additive and green solvent, involves multiple steps of hydrogenation. Among these reactions, the deep hydrogenation of the furan ring in furfural interrupts GVL formation over Ni or Co-based catalysts. In this study, a method of alloying Ni and Co with Fe over a ZSM-5 support was proposed for tackling excessive activity of the catalyst for hydrogenation. The results indicated that the formation of binary NiFe and CoFe alloys in Ni–Co–Fe/ZSM-5 enhanced the dispersion of metallic species, reduction of metal oxides, formation of more Lewis acidic sites, and the adsorption of the C–O functionality of the furan ring, while lowering the capability for adsorption/activation of H2 and the adsorption of the CC group of the furan ring. These factors together reduced the activity for the hydrogenation of the furan ring in furfural, but enhanced the hydrogenation of the CO in ethyl levulinate (EL). The kinetic study confirmed that the hydrogenation of EL was the rate-determining step. The coordination of the dual alloys, NiFe and CoFe, in the bifunctional Ni–Co–Fe/ZSM-5 catalyst rendered superior activity for selective one-pot conversion of furfural to GVL with a yield of 85.7%.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）