JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Xiao Cui,Xinli Chen,Wenjie Zhang,Xiaoqing Yan,Ming Wang,Jiancong Lian,Zhuan Zheng,Hong Deng
Metal oxides with hierachical three-dimensional (3D) superstructure , which integrate large surface area with high electrical conductivity , have been regarded as desirable and ideal electrode materials for supercapacitors . In this work, 3D hierarchical CoMoO 4 @C@MnO 2 core-shell nanorod arrays (NRAs) on nickel foam were fabricated by a facile and stepwise hydrothermal approach. The morphologies of CoMoO 4 and CoMoO 4 @C@MnO 2 were explicitly investigated. The CoMoO4@C@MnO2 based electrodes exhibited excellent capacitive performances. In comparison to the specific capacitance of CoMoO 4 (1080 F g −1 at a current density of 3 A g −1 and 82% retained capacitance over 5000 cycles) The CoMoO 4 @C@MnO 2 based electrodes showed improved performance, delivering specific capacitance up to 1824 F g −1 at 3 A g −1 and 86% retained capacitance over 5000 cycles. The results establish that the binder-free CoMoO 4 @C@MnO 2 is a promising candidate for high performance electrochemical supercapacitors.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
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IF 3.9
Wenhui Xiong,Zijie Cai,Zihao Wang,Zhongkai Wu,Wencen Mei,Zhizheng Wu,Dingbang Liu,Shiming Yang,Weiping Zhou,Zhenzhi Cheng,Jun Wang,Guangsheng Luo
Multivariate transition metal sulfides and porous nanosheet architectures hold promising potential for applications for the energy-related application. Nevertheless, the addition of polymer binders and conductive agents can adversely affect their electrochemical performance. In this work, we present self-assembled Ni-Co sulfide nanosheet arrays growing on foamed Ni (Ni-Co-S@NF). Ni-Co-S@NF electrode materials are synthesized through the complete sulfidation of interconnected ultrathin nanosheets derived from NiCo layered double hydroxides. The highly conductive nickel foam facilitates electron transfer while the 3D network structure promotes electrolyte diffusion and penetration. Hence, porous Ni-Co-S@NF materials presents the excellent specific capacitance as 1286.6C g −1 in 1 A g −1 and retained 70 % of its original capacity over 5000 charge–discharge cycles. Furthermore, we assemble an asymmetric supercapacitor used active carbon as negative-electrode material and Ni-Co-S@NF as positive-electrode material. This device delivers the specific energy is 74.0 Wh kg −1 and specific power of 850.0 W kg −1 .
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Kang Ge,Yanwei Zeng,Guodian Dong,Longfei Zhao,Zhentao Wang,Ming Huang
The growing hydrogen consumption has greatly promoted the development of efficient, stable and low-cost electrocatalysts for the hydrogen evolution reaction (HER). Constructing functional nanostructures is an efficacious strategy to optimize catalytic performance. Herein, we present a feasible route to fabricate distinctive 3D grass-like cobalt phosphide nanocones clad with mini-vesicles on the hierarchically porous Ni foam, which can directly serve as a binder-free electrocatalyst with superior catalytic activity and durability in HER. Thanks to its distinctive 3D microstructure featured with favourable pore-size distribution, abundant active sites provided by mini-vesicles and rapid electron transfer with the assistance of Ni foam, the as-grown grass-like CoP/NF electrocatalyst has shown a favourable overpotential in an acidic solution with an onset overpotential of ∼35 mV, an overpotential of 71 mV at a current density of 10 mA cm −2 , reduced by 60 mV in comparison with that realized by urchin-like CoP/NF nanoprickles. Moreover, it has exhibited an excellent HER activity in the alkaline medium , with an overpotential of 117 mV at 10 mA cm −2 , a Tafel slope of 63.0 mV dec −1 and a long-term electrochemical durability.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Xiaoyu Chen,Xiaoshuai Yu,Chuncheng Yang,Guoyong Wang
The oxygen evolution reaction is more challenging than the hydrogen evolution reaction in overall water splitting, not only because the four-electron reaction is more complex but also because the oxidizing environment of the anode reaction is more destructive to the electrode material. Generally, such destruction results in the formation of an oxide film that hinders the transition of electrons and subsequently decelerates the succeeding reaction. This paper proposes a transition layer for self-supporting electrodes (NiFe LDH@NiCoP/NF) in which NiCoP grows between the NF and NiFe LDH. The implementation of NiCoP as a transition layer, showcasing excellent antioxidation capability and conductivity, effectively reduced overpotentials and consequently enhanced the catalytic performance. Benefiting from this transition layer, in a 1.0 M KOH, the NiFe LDH@NiCoP/NF catalyst exhibited outstanding OER and HER performance, requiring only 281 and 102 mV, respectively, to achieve 100 and 10 mA cm −2 , and also exhibited a cell voltage for overall water splitting of 1.56 V at 10 mA cm −2 .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Long Xie,Jiaxuan Guo,Tianhao Wang,Xiaoqiang Du,Xiaoshuang Zhang
Electrolyzing water to produce hydrogen is currently one of the most attractive methods to alleviate the energy problem and environmental pollution. However, the slow oxygen production kinetics and complex mechanism have greatly limited its large-scale application. In our study, multiple types carbon-encapsulated C@M-Ni 2 P/NF (M = Co, Zn) were synthesized via impregnation and phosphidation process for the first time to address the need for environmentally friendly and high-performance bifunctional catalysts in electrocatalytic water splitting. Electrochemical tests revealed C@Co-Ni 2 P/NF present excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activity in an alkaline medium. The overpotentials were 196/255/294 mV at 10/50/100 mA·cm −2 (Tafel slope 34.20 mV·dec −1 ) for OER; the overpotentials were 199/311/363 mV for HER, which is outperforming C@Zn-Ni 2 P/NF, Ni 2 P/NF, and bare NF. The experimental analysis demonstrate that the improvement in performance for C@Co-Ni 2 P/NF is attributed to a “crack-texture interwoven” hierarchical pore structure and a protective surface carbon layer. In addition, when it is assembled into a two-electrode system, the electrolytic cell demonstrates excellent electrochemistry performance and acceptable durability under fluctuating power. In-situ Raman characterization demonstrated that the in-situ generated NiOOH and CoOOH, along with the material itself, synergistically catalyzed, resulting in the high activity of the catalyst. Density functional theory (DFT) analysis confirmed Co modification optimized water adsorption energy (-0.52 eV) and enhanced conductivity of C@Co-Ni 2 P/NF electrode by regulation of the d -band center. This study offers a promising and feasible strategy for developing robust and high-performance electrocatalysts.
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高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Changhui Liang,Hongjun Fan,Aiqun Kong,Mao Peng,Menghui Liu,Weizhuo Xu,Jian Song,Yongxin Li,Jinli Zhang,Yunjie Ding,Z. Conrad Zhang
The hydrogen evolution reaction (HER) activity of Pt-based electrocatalysts in alkaline solution is typically limited by the rate of water dissociation. Herein, we report a facile one-step strategy in the synthesis of Pt/Ni(OH) 2 heterojunction for enhanced HER activity. Ultrathin Ni(OH) 2 nanosheets decorated with uniformly dispersed Pt nanoparticles at average sizes of 2.2 nm are in-situ grown on nickel foam (NF) with binder-free feature under mild conditions due to induction by ethylene glycol diethyl ether, even without adding extra Ni 2+ sources. The synthesized Pt/Ni(OH) 2 /NF shows superior HER activity in 1.0 M KOH solution, achieving low overpotentials of 42, 91, and 114 mV at current densities of 10, 100, and 200 mA cm −2 and outstanding durability for 25 h at 25 mA cm −2 without noticeable Pt agglomeration. This work offers a mechanistic insight into one-step fabrication of Pt/Ni(OH) 2 -based catalyst with high activity and stability for HER.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Biying Liu,Man Zhang,Yuchen Wang,Zuo Chen,Kai Yan
Layered double hydroxides (LDHs) containing transition metals with unsaturated d-bands are ideal candidates for oxygen evolution reaction (OER). However, the bulk layers and congested interlayers block the active sites and avoid the electrolyte access to the internal space. In this work, we report a simple coprecipitation coupled with the hydrothermal method for the direct growth of bimetallic NiCo-LDHs (5.01 nm), NiMn-LDHs (3.45 nm) and trimetallic NiCoMn-LDHs nanosheets (1.26 nm) on Ni foam and these fabricated electrodes exhibit the superior performance for OER. Notably, the NiCoMn-LDHs nanosheets exhibit the lowest overpotential of 290 mV at 20 mA cm −2 and the smallest Tafel slope of 87 mV dec −1 , reducing by 20–40 mV and 31–39 mV dec −1 in comparison with those of bimetallic NiCo-LDHs (310 mV, 118 mV dec −1 ) and NiMn-LDHs (330 mV, 126 mV dec −1 ). This excellent performance is attributed to the 2D structure of the nanosheets and an abundance of exposed active sites, especially oxygen vacancies . Additionally, NiCoMn-LDHs nanosheets exhibit the smallest charge transfer resistance (R ct ) of 6.3 Ω and the largest electrochemical double layer capacitance (C dl ) of 5.52 mF cm −2 than those of the bimetallic NiCo-LDHs (11.0 Ω, 4.85 mF cm −2 ) and NiMn-LDHs (30.6 Ω, 3.00 mF cm −2 ). Furthermore, NiCoMn-LDHs nanosheets maintain good durability over 10 h and cyclic stability without distinct change. This work offers a facile strategy to design various types of bimetallic and trimetallic LDHs boosting for OER process.
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高影响因子
ELECTROCHIMICA ACTA
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2020
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IF 6.215
Xueli Zhang,Izhar Ullah Khan,Silu Huo,Yubo Zhao,Bolong Liang,Kexun Li,Hao Wang
Pristine Prussian-blue analogues (PBAs) are deemed to be very promising candidates for efficient catalysis. However, few reports are available on exploring the PBAs-based materials in the field of water oxidation due to their poor conductivity and limited catalysis performance. Herein, a chemical corrosion strategy is proposed to in-situ hierarchically deposit Ni-Fe Prussian-blue analogue (NiFePBA) on Ni foam (NF) to fabricate the 3D self-supported electrode. Followed by acid etching and calcination at low temperature, this semisacrificial template derives a core-shell heterojunction, in which the undecomposed NiFePBA serves as the core and the surficial NiFe 2 O 4 acts as the shell. This well-designed composite delivers a prominent performance for oxygen evolution reaction (OER) with a low overpotential of 244 mV at the current density of 10 mA·cm −2 and 304 mV at 100 mA·cm −2 . This hierarchical structure provides abundant active sites, facilitates electrolyte infiltration and promotes fast charge and mass transportation, which all contribute to the remarkable activity towards water oxidation. Additionally, the chemical corrosion strategy in this work opens a promising avenue to deposit PBAs or PBAs derivatives on the metal substrates to fabricate multiple 3D self-supported electrodes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Xueying Cao,Dedong Jia,Da Li,Liang Cui,Jingquan Liu
Considering the synergistic effect of transition metal phosphides and 3D structure substrates, herein, we directly deposited well-defined hierarchical radial Ni x P nanospheres on Ni foam via a facile, one-step co-electrochemical method to function as highly active flexible electrodes for both hydrogen evolution reaction and supercapacitor. Impressively, the bifunctional Ni x P/NF electrode requires an overpotential of only 63 mV to achieve a current density of 10 mA cm −2 and demonstrates a low Tafel slop of 55 mV dec −1 in 1 M KOH. Moreover, the electrochemical supercapacitor based on this hierarchical Ni x P/NF electrode also shows a superior specific capacitance of 1684 mF cm −2 (382.7 F/g) at a current density of 2 mA cm −2 and an outstanding retention ratio of 110.9% of its original capacitance value after 4000 cycles in 6 M KOH. Hopefully, excellent electrochemical performances demonstrate that this Ni x P/NF material could be a promising candidate for future applications in both hydrogen evolution reactions and supercapacitors.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Daosong Zha,Huanhuan Sun,Yongsheng Fu,Xiaoping Ouyang,Xin Wang
As a widely concerned material for supercapacitors, nickel cobalt layered double hydroxides (NiCo-LDHs) often suffer from the inferior rate capability and cycling stability due to the low electrical conductivity and easy agglomeration. To address these shortcomings, a simple in-situ hydrolysis approach is successfully developed to construct a binder-free system consisting of acetate anion-intercalated nickel cobalt layered double hydroxides (A-NiCo-LDHs) and Ni foam (NF) without additional alkali sources. The resulting A-NiCoLDH/NF electrodes exhibited obviously enhanced capacitive properties owing to the unique nanostructure and strong synergistic effects. It is worth noting that the optimized A-Ni 5 Co 5 -LDH/NF electrode delivered the highest performance among the electrodes studied, including ultrahigh specific capacitance (2445 F g −1 at 0.5 A g −1 ) and superior rate capability (1644 F g −1 and 1383 F g −1 at 20 A g −1 and 50 A g −1 , respectively), as well as satisfactory long-term endurance (∼93% capacitance retention after 10,000 cycles at 20 A g −1 ). The attractive performances and facile fabrication make the A-Ni 5 Co 5 -LDH/NF system a promising candidate for low-cost high-performance energy storage devices.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Xiaomei Xu,Bilu Yang,Zhaodi Xu,Qiaoling Mo,Xiaomei Shen,Hu Cai
In the pursuit of advancing the production of H 2 through hydrogen-evolution reaction (HER), the demand for the elaborate design of cost-effective and robust durability electrocatalysts has gained momentum, especially replacement of noble-metal counterparts like Pt. Herein, we introduce a facile one-pot hydrothermal approach to synthesize nickel foam-supported Ni 3 S 2 nanosheet arrays, which integrate with carbon-quantum-dot (CQDs) and Cu, Mo dual-metal doped. With the introduction of CQDs and Cu, Mo dual-metal doped site, the optimal CQDs-Cu-Mo-Ni 3 S 2 @NF exhibits superior HER catalytic activity with a low overpotential of 125 mV at 10 mA·cm −2 and strong durability for 30 h in alkaline medium. The exceptional electrocatalytic performance is ascribed to the synergistic effect of CQDs and Cu, Mo dual-metal site. This synergy encompasses optimization of water molecule adsorption/desorption energetics , elevated electrical conductivity , weakening of the strong S–H bond interaction on the Ni 3 S 2 surface, and providing ample active centers. Furthermore, an in-depth understanding of the electronic structure and adsorption energy during the HER process is probed by density functional theory (DFT) analysis. Our work provides a quintessential paradigm for the rational design of multi-component electrocatalysts for water splitting.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Shuang Wu,Zheni Wang,Lei Wan,Chenghui Luo,Shams Ali Baig,Xinhua Xu
In the present study, Pd/Ni foam electrode was prepared by improved impregnation method for electrocatalytic hydrodechlorination (ECH) of clofibric acid (CA). The effects of complexing agent addition into the impregnation solution for the formation of Ni(OH) 2 and the ECH activity of Pd/Ni foam electrode were investigated. Results revealed that the introduction of sodium acetate (the complexing agent) greatly enhanced the ECH activity as compared to common impregnation liquid. Characterizations analyses demonstrated that the addition of sodium acetate did not change the phase of the electrode’s surface, but effectively reduced the deposition of Ni(OH) 2 . The surface morphology of the electrode was changed simultaneously by the addition of sodium acetate and the interlacing structure of Ni(OH) 2 and Pd catalyst was formed. NaAc before -Pd/Ni and NaAc after -Pd/Ni foam electrodes were used to perform ECH experiments on CA, and the combined Pd/Ni foam 15 min electrode was compared with the Pd/Ni foam 6 h electrode. After 2 h of electrolysis, the NaAc after -Pd/Ni foam electrode was found to remove the CA (∼100%) in the solution, which was 1.3 times the removal rate of the Pd/Ni foam 6 h electrode to CA and exceeded the Pd/Ni foam 15 min electrode. Findings from the present study demonstrated that adding the complexing agent into the impregnation solution can improve the ECH activity of Pd/Ni foam electrode and achieve a faster and more efficient dechlorination effect of CA.
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高影响因子
危险品化学品经营许可证（带存储）