ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yaoyao Ning,Dandan Ma,Yu Shen,Fumin Wang,Xubin Zhang
Electrochemical water splitting into hydrogen energy offers a promising pathway for renewable and clean energy conversion and storage, but high overpotentials are needed to drive the process owing to the sluggish kinetics of the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER). Herein, three-dimensional (3D) mushroom-like NiCo/NiCo 2 S 4 @NiCo arrays grown directly on Ni foam (NF) have been constructed via hydrothermal and electrodeposition methods. Owing to the unique mushroom-like structure and the beneficial effect of the composite catalyst, the NiCo/NiCo 2 S 4 @NiCo/NF electrode exhibits excellent activity and stability for both OER and HER. When serving as an anode electrocatalyst , the composite catalyst only requires a overpotential of 294 mV to achieve a high current density of 100 mA/cm 2 for the OER in 1 M KOH. Moreover, in chronopotentiometric and chronoamperometric measurements, the NiCo/NiCo 2 S 4 @NiCo/NF electrode displays distinguished electrochemical and structural stability for at least 100,000 s. Similarly, the NiCo/NiCo 2 S 4 @NiCo/NF catalyst delivers a hydrogen production current density of 10 mA/cm 2 at an overpotential of 132 mV and shows no obvious attenuation of performance after stability testing for 100,000 s in an extreme alkaline environment. Accordingly, the remarkable and stable bifunctional abilities enable the application of the NiCo/NiCo 2 S 4 @NiCo/NF catalyst in two-electrode water-alkali electrolyzers with a low cell voltage of 1.55 V to deliver a current density of 10 mA/cm 2 and excellent stability for over 27 h.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Mengxi Song,Kemin Qi,Yuan Wen,Xiaoli Zhang,Yi Yuan,Xiaoyun Xie,Zhaowei Wang
Direct Z-scheme heterojunctions composed of Ag 2 O nanoparticles and ZnO nanorods were immobilized on Ni foam (AZN) via combined hydrothermal and precipitation methods to successfully construct 3D reticulated composites, and their photocatalytic performance were evaluated under simulated sunlight. Just as expected, the AZN samples exhibited excellent photocatalytic effects of 99.26% for the model pollutant (rhodamine B) in water after loading with Ag 2 O, which was 2.77 times higher than that of regular ZnO NAs/Ni foam composites. Meanwhile, the surface wettability of composite was remarkably enhanced. Besides, a series of photoelectrochemical measurements showed a significant improvement in the charge separation efficiency of AZN, which was attributed to the synergistic effect of direct Z-scheme heterojunction, matched energy band structure as well as 3D porous structure. Moreover, the AZN sample presented satisfactory stability after four cycles, meanwhile it displayed good removal performance against different types of antibiotics (Tetracycline, Sulfadiazine and Ciprofloxacin). The applicability and durability of AZN for rhodamine B degradation were evaluated by sequential batch experiments in a homemade simulated flowing water device. More importantly, the lower value of electrical energy per order indicated the photocatalyst/simulated sunlight system was more energy efficient and effective. Accordingly, this work provided a new strategy for designing 3D reticulated composites with low-dimensional nanomaterials to decompose organic pollutants in impaired waters.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Xiaoyang Xu,Linan Liang,Zhenni Zhang,Rui Xiong,Xiangjing Zhang,Ying Zhao,Shanlin Qiao,Yantao Zhang
Considering the connected function, high conductivity and electrochemical double layer capacitance properties of reduced graphene oxide (RGO), the NiMoS 4 nanosheets were anchored on RGO coated Ni foam by a facile hydrothermal method to obtain the NiMoS 4 @RGO/Ni foam self-supporting electrode without the extra binders. Surprisingly, the prepared NiMoS 4 @RGO/Ni foam with unique hierarchical lamellar structure can exhibit the high specific capacity of 408 mAh/g at 0.5 A/g, which can be compared with all relevant NiMoS 4 reports. In view of the good supercapacitor performances and practical application feasibility of NiMoS 4 @RGO/Ni foam, the NiMoS 4 @RGO/Ni foam//AC hybrid supercapacitor device also can show the comparable energy density of 67.4 Wh/kg at 562.5 W/kg to that of all NiMoS 4 based hybrid supercapacitors , as well as the good cycle stability. This work can indeed improve the supercapcaitor properties of NiMoS 4 based materials, and be also treated as an important attempt of NiMoS 4 based materials for supercapacitors .
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Mabrook S. Amer,Prabhakarn Arunachalam,Ahmad A. Alsaleh,Zeyad A. Almutairi,Hazim M. Al-Otaibi,Abdullah Al-Mayouf
Developing efficient and selective electrocatalysts for electrochemical ammonia oxidation (eAOR), coupled with proper electrochemical processes, offers promising opportunities for recycling ammonia into valuable fertilizers and as a potential technology for energy production and storage applications. Here, we introduce Ni(OH) 2 /Ni x Cu y B@NF electrodes, developed by in-situ solvothermal methods, as highly effective and durable electrocatalytic materials. The eAOR features of Ni(OH) 2 /Ni x Cu y B@NF displays the smallest overpotential of 130 mV (at 50 mA cm −2 ) and attained a enhanced current response of 178.3 mA cm −2 (@ 1.60 V RHE ). As shown by the electrocatalytic features and stability of Ni(OH) 2 /Ni x Cu y B@NF films at 1.43 V for an eAOR of 50 mA cm −2 , the HER current was 100 mA cm −2 at 99 mV, the smallest value among all Ni-based electrocatalysts studied. Gas chromatography (GC) experiments show that ammonia produces N 2 in the electrochemical cell at different times. In the eAOR-HER system, impressive electrocatalytic performance has been observed with higher FE of N 2 and H 2 was 47 % and 27.1 %. A two-electrode arrangement of Ni(OH) 2 /Ni x Cu y B@NF needs only 1.53 V to split ammonia to acquire 10 mA cm −2 , which is lower than any other electrode material. Based on the results, Ni(OH) 2 /Ni x Cu y B@NF might be a suitable system for wastewaters bearing high levels of ammonia, generating more sustainable hydrogen from wastewater, and recycling fertilizers.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Yuan Zhang,Hui Wang,Yafei Zhao,Huiwen Wang
Ni foam (NF) is widely employed as a binder-free electrode substrate owing to its high porosity and excellent conductivity. However, its inherent limitations, such as low specific surface area and negligible intrinsic capacitance, constrain the overall electrochemical performance. To overcome these drawbacks, we developed a chemical modification strategy that combined in-situ Fe etching, Co doping and sulfur ion-exchange to regulate the NF. The resulting substrate, denoted as NC 2/3 F 4/3 -S 0.5 , features a honeycomb-like (Fe, Co)-doped Ni 3 S 2 array structure. This architecture simultaneously provides enlarged specific surface area and enhanced OH − adsorption capacity, thereby contributing to a significantly improved electrochemical active surface area and intrinsic capacitance. Consequently, NC 2/3 F 4/3 -S 0.5 serves as an ideal scaffold for the subsequent electrodeposition of ZnCo-layered double hydroxide (ZnCo-LDH), enabling the construction of an integrated, binder-free ZnCo-LDH/NC 2/3 F 4/3 -S 0.5 electrode. Owing to the synergistic effect between NC 2/3 F 4/3 -S 0.5 and redox-active ZnCo-LDH, the optimized electrode delivered a remarkable areal capacitance of 13.68 F/cm 2 at 3 mA/cm 2 . Furthermore, a hybrid supercapacitor (HSC) assembled with this positive electrode and an activated carbon negative electrode achieved a high energy density of 350 μWh/cm 2 at a power density of 2270 μW/cm 2 . This work not only provides a highly efficient ZnCo-LDH/NC 2/3 F 4/3 -S 0.5 binder-free electrode but also demonstrates the critical role of synergistic effect between a multinary sulfide scaffold and a layered double hydroxide for advanced supercapacitors.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ying Xue,Xilong Liu,Leiyun Han,Zhengjie Xie,Liangyu Liu,Yixin Li,Yingjie Hua,Chongtai Wang,Xudong Zhao,Xiaoyang Liu
The present study successfully synthesized NiCo 2 S 4 nanotubes@NiMn-LDH nanosheets core-shell hybrid structure on Ni foam through a controllable three-step facile hydrothermal method , the NiMn-layered double hydroxides (LDHs) nanosheets with unlike thicknesses adhere to the outer layer of NiCo 2 S 4 nanotubes by adjusting the heating time of hydrothermal reaction. The optimized NiCo 2 S 4 @NiMn-LDH electrode was able to transmit a high specific capacity of 822.64 C g −1 (4.36 C cm −2 ) at a high current density of 50 mA cm −2 , and maintained 92.7% of its initial specific capacity after 5000 cycles at a current density of 50 mA cm −2 when 2 M KOH was used as the electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device fabricated with NiCo 2 S 4 @NiMn-LDH as the positive electrode and activated carbon (AC) as the negative electrode, and it achieved a maximal energy density of 53.10 W h kg −1 at a power density of 370.82 W kg −1 also maintained 94.3% retention of the initial specific capacitance after 10,000 cycles at a high current density of 20 mA cm −2 . With the excellent electrochemical properties , the as-prepared core-shell structured NiCo 2 S 4 @NiMn-LDH hybrid arrays have extraordinary application potential in the energy storage field.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 15
·9419-9433
·
IF 4.22
Xuan Haicheng,Wang Rui,Yang Jing,Zhang Guohong,Liang Xiaohong,Li Yuping,Xie Zhigao,Han Peide
Currently, substantial attention has been concentrated on the preparation and practical application of complex hierarchical nanostructure composite, which exhibits excellent electrochemical properties compared to the single-structured materials. Hence, a novel electrode of NiMoO 4 @Co 3 O 4 –5H composite nanoarrays supported on reduced graphene oxide/Ni Foam (rGO/NF) was synthesized through the facile hydrothermal method. The composite combines the advantages of the large specific capacitance of NiMoO 4 and the great rate capability of Co 3 O 4 , exhibiting the distinguished specific capacitance and rate performance. The prepared NiMoO 4 @Co 3 O 4 –5H composite shows an enhanced pseudocapacitive performance of about 1722.3 F g −1 at a current density of 1 A g −1 , and eminent rate capability of 80.8% at 10 A g −1 . Moreover, the composite delivers good long-term cycling stability with capacitance retention of 91% after 6000 cycles. An asymmetric supercapacitor (ASC) was fabricated using NiMoO 4 @Co 3 O 4 –5H and AC as the positive electrode and negative electrode, achieving the high energy density of 37.1 Wh kg −1 at a power density of 798.0 W kg −1 , and exceptional cycling stability (100% retention after 4000 cycles). These consequences suggest that NiMoO 4 @Co 3 O 4 –5H could be considered as a potential electrode material for energy storage devices. Graphical abstract
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高影响因子
Small
·
2020
·Vol. 16
·期 44
·2004188
·
IF 11.459
Xiaofeng Zhang,Feng Yang,Haixin Chen,Kun Wang,Junwei Chen,Yi Wang,Shuqin Song
In order to further overcome the shortage of electrodes with additive/binder and modulate the structure of NiCo 2 O 4 for supercapacitors, ultrathin NiCo 2 O 4 nanosheet arrays have been in situ grown on Ni foam by optimizing hydrothermal reactions based on crystal growth dynamics. The structure of ultrathin NiCo 2 O 4 nanosheet arrays can expose more active sites, provide abundant diffusion channels and buffer the stress caused by phase transition during charge–discharge process of supercapacitors. The optimized hydrothermal reactions can provide more ordered crystal orientations by keeping nanosheets on Ni foam completely coming from in situ growth, which will decrease the inner resistance of ultrathin NiCo 2 O 4 nanosheets and improve the efficiency and kinetics of electrons transfer. By the virtue of such remarkable features, the electrochemical results confirm the rationality of structural modulation and crystal orientations optimization with a drastically enhanced specific capacitance of 2017.8 F g −1 , admirable rate performance of 93.2% and outstanding stability retention of 90.9% after cycling 5000 times. More impressively, the assembled flexible solid-state asymmetric supercapacitor (ASC) shows superior energy density, power density, and high stability. The modification strategy in this paper may throw light on the rational design of new generation advanced electrode materials for high-performance flexible supercapacitors.
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Ruiyang Zhang,Tao Ran,Yuehan Cao,Qian Zhang,Fan Dong,Guidong Yang,Ying Zhou
Catalysis oxidization has been known to be an effective technique in environmental remediation. However, low efficiency for oxygen activation and difficult recovery of the catalysts in powdery form significantly limit the practical application. In this work, a new-type monolithic α-Ni(OH)2/Ni-foam was fabricated by the hydrothermal process. We found that H atoms of α-Ni(OH)2 can significantly promote oxygen activation, which endows it with favorable NO and NO2 oxidization confirmed by theoretical calculation and in situ DRIFTS. Furthermore, the introduction of Ni foam accelerated the pollutant gas transfer and charge carriers’ separation because of its abundant porous structure and high conductivity and its monolithic property simplified the recycling operation. Consequently, the obtained α-Ni(OH)2/Ni-foam achieved an excellent NO oxidation (69.0%) and no toxic NO2 was detected under visible light illumination (λ > 420 nm), indicating its highly promising potential in environmental remediation. Our work provides a conceptually different fresh perception to promote oxygen activation for highly efficient gas purification.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zimo Lou,Jiang Xu,Jiasheng Zhou,Kunlun Yang,Zhen Cao,Yizhou Li,Yuanli Liu,Liping Lou,Xinhua Xu
Atomic H* has been regarded as the key active species for the electrocatalytic hydrodechlorination (ECH), and the electrode design and operation conditions are related to the atomic H* generation. However, there is limited understanding of how the operation parameters affect the atomic H* generation and utilization. Due to the fact that Pd was inefficient in water dissociation step, MnO 2 was combined with Pd to construct a novel Pd/MnO 2 /Ni foam cathode. Cyclic voltammetry confirmed that Pd/MnO 2 /Ni foam cathode with MnO 2 load of 0.51 mg cm −2 possessed the highest atomic H* generation and ECH activity. Excessive Pd load (>0.44 mg cm −2 ) was detrimental to ECH because of the side hydrogen evolution reaction (HER). Operation conditions (e.g. applied current and electrolyte concentration) would directly affect the cathode potential, which was an important indicator of the atomic H* generation. The optimal cathode potential was determined to be −0.85 V when the applied current was 10 mA in this study. The electrolyte concentration of 10–15 mM was able to provide sufficient atomic H* for ECH, while excessive input of electrolyte would favor HER but inhibit ECH. ECH at acidic and neutral/alkaline solution underwent different pathways for atomic H* generation and further affect the utilization of atomic H*. After 120 min reaction, >70% of atomic H* could be selectively used for ECH at initial pH of 4.0 and 5.0, while only ∼37% was used for ECH at initial pH of 7.0. This work correlated the reactivity of electrode with the atomic H* and cathode potential, which would provide strategies for ECH catalyst design and operation optimization.
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高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Jingwei Li,Lijuan Jiang,Shuai He,Licheng Wei,Rongfu Zhou,Jinming Zhang,Dingsheng Yuan,San Ping Jiang
Development of efficient, stable, and robust bifunctional electrodes is important for the practical and industrial application of water electrolysis technologies for renewable hydrogen production. Here, we report the fabrication of heterostructured Ni(OH)2 nanosheets/Ni3S2 nanoneedles grown on Ni foam, Ni(OH)2/Ni3S2/NF, as a highly active and mechanically strong bifunctional electrode for overall water splitting. The results indicate that heterostructured Ni(OH)2/Ni3S2 interfaces are the reactive center for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The redistribution of electrons and formation of the Niδ+ and Sδ− active species serve as the hydroxyl and proton acceptors and significantly promote the transformation of intermediate species and charge transfer processes in both the OER and HER. The Ni(OH)2/Ni3S2/NF electrode shows overpotentials as low as 252, 279, and 319 mV to reach 30, 50, and 100 mA cm–2, respectively, for OER and 48, 79, and 185 mV to achieve 10, 20, and 100 mA cm–2, respectively, for HER in 1.0 M KOH solution. An alkaline electrolyzer assembled by bifunctional Ni(OH)2/Ni3S2/NF electrodes displays cell voltages of 1.80 V to deliver 100 mA cm–2 and is stable for over 100 h. This study demonstrates promising potential of the Ni(OH)2/Ni3S2/NF bifunctional electrode for advancing water-splitting technologies.
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高影响因子
ChemElectroChem
·
2018
·Vol. 5
·期 17
·2376-2382
·
IF 4.446
Gang Yuan,Xiaopo Niu,Zhichao Chen,Li Wang,Xiangwen Zhang,Qingfa Wang
Graphical Ni 3 S 2 acts as a noble catalyst : A 3D porous, defect rich, and self-supported Ni 3 S 2 @Ni foam with core-shell structure is fabricated as electrocatalyst for methanol fuel cells. The electrocatalyst shows Pt-like activity, high poison tolerance, and long-term stability towards methanol oxidation in alkaline media. Direct methanol fuel cells are promising renewable energy devices for automobiles and portable electronic devices. The development of high effciency, poison tolerance, long-term stability, and noble metal-free electrocatalysts for methanol oxidation is still a major challenge. Herein, we develop a noble metal-free, 3D self-supported, defect-rich, hierarchical shell-core structured Ni 3 S 2 composite on Ni foam as electrocatalyst. This electrocatalyst shows a good activity, poison tolerance, and long-term durability towards methanol oxidation in alkaline media. It shows the lowest onset potential (−340 mV vs. Hg/HgO) among all the Ni-based catalysts reported up to date and a Pt-level specific activity. The methanol oxidation peak current of the electrocatalyst retains more than 97.5 % even after 5,000 voltammetry cycles in 0.5 M KOH+1 M CH 3 OH. The morphology and composition of the electrocatalysts before and after stability test were characterized by SEM, TEM, XRD, and XPS. The high activity, poison tolerance, and stability are attributed to the binder-free, directly grown Ni 3 S 2 shell on the Ni foam backbone, the lattice defect sites, and the synergetic effects between the in-situ formed active NiO x core and Ni 3 S 2 shell during methanol oxidation. This work indicates that the self-supported hierarchical shell-core Ni 3 S 2 @Ni foam electrocatalyst is a viable alternative for commercial Pt-based electrocatalyst applied in fuel cells.
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高影响因子
危险品化学品经营许可证（带存储）