APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Wenhao Zhang,Yuanhao Tang,Liangmin Yu,Xin-Yao Yu
Nickel-based metal oxides/hydroxides are promising electrocatalysts for oxygen evolution reaction. However, their electrocatalytic activity for hydrogen evolution reaction (HER) is very poor. Herein, taking Mo-incorporated nickel hydroxide (Mo-Ni(OH) 2 ) as an example, a facile, time-efficient, and low-temperature H 2 /N 2 plasma activation strategy is developed to activate the HER performance by constructing heterostructure. This kind of heterostructure is composed of metal, metal alloy, metal nitride , and oxygen vacancy-riched metal hydroxide with more exposed catalytically active sites, enhanced mass activity, and accelerated electron transport. The optimized plasma-activated Mo-Ni(OH) 2 (P-Mo-Ni(OH) 2 ) manifests superior HER performance to pristine Mo-Ni(OH) 2 and even comparable to the benchmark Pt/C catalyst in alkaline solution. Moreover, when assembling a two-electrode urea-assisted water electrolysis system by using P-Mo-Ni(OH) 2 as both cathode and anode, the assembled cell only need a small voltage of 1.36 V to achieve a current density of 10 mA cm −2 and exhibits extremely stable catalytic performance up to 1000 h.
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高影响因子
ACS Catalysis
·
2024
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IF 11.3
Yuexiang Li,Junliang Liu,Shuqi Li,Shaoqin Peng
Hydrogen production through electrochemical water splitting (EWS) presents a viable solution for addressing the fossil energy crisis. However, the commercial viability of this approach is impeded by the sluggish kinetics of the oxygen evolution reaction (OER). It is urgently needed to develop efficient, stable, and cost-effective OER electrocatalysts. Herein, we comprehensively design and investigate a phosphate ion and Fe3+ codecorating Ni(OH)2/NiOOH electrocatalyst (Pi-Fe:NiOH) for OER. This codecoration induces multiple synergistic effects, which include an increase in the interlayer water content for the internal OER, altering the OER mechanism, facilitating proton transport across the layers, and improving the stability of Pi-Fe:NiOH. Consequently, Pi-Fe:NiOH exhibits a high OER activity with overpotentials of 118 ± 1 and 222 ± 4 mV at current densities of 10 and 100 mA cm–2, respectively. More impressively, it maintains stable operation at a high current density of around 300 mA cm–2 for at least 500 h, much better than the Ni(OH)2/NiOOH electrocatalyst (NiOH) for less than 6 h at a current density below 200 mA cm–2. These findings offer insights for the design of anion–cation codoped hydroxide eletrocatalysts, paving a way for the development of efficient and stable OER electrocatalysts.
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Nanoscale
·
2014
·Vol. 6
·期 13
·7424-7429
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IF 6.739
Beibei Zhan,Changbing Liu,Huaping Chen,Huaxia Shi,Lianhui Wang,Peng Chen,Wei Huang,Xiaochen Dong
Three-dimensional graphene foam (3DGF) is a superior sensing material because of its high conductivity, large specific surface area and wide electrochemical potential windows. In this work, hexagonal Ni(OH)2 nanosheets are deposited on the surface of chemical vapor deposition-grown 3DGF through a facial hydrothermal process without any auxiliary reagents. The morphology and structure of the composite are characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectroscopy, and X-ray diffraction (XRD). Based on the Ni(OH)2/3DGF composite, a free-standing electrochemical electrode is fabricated. Being employed as a nonenzymatic glucose detection electrochemical electrode, it exhibits a high sensitivity (∼2.65 mA mM−1 cm−2), low detection limit (0.34 μM) and excellent selectivity with a linear response from 1 μM to 1.17 mM. The excellent sensing properties of the Ni(OH)2/3DGF electrode may be attributed to the synergistic effect of the high electrocatalytic activity of Ni(OH)2 nanosheets and the high conductivity and large surface area of 3DGF.
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PubMed
高影响因子
MATERIALS LETTERS
·
2014
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IF 2.269
Jing-He Yang,Chao Wang,Duo Yang,Xingyun Li,Peng Shang,Yamin Li,Ding Ma
The boron-doped α-Ni(OH) 2 nanoflowers (B-α-Ni(OH) 2 ) with high specific surface area (400 m 2 g −1 ) were synthesized by the one pot liquid-phase method using P123 (EO 20 PO 70 EO 20 ) as template and NaBH 4 as alkali and boron sources. The size of the B-α-Ni(OH) 2 nanoflowers is about 300 nm and there are many porous. The 50 nm nanoplates are the basic structure units of nanoflowers and thickness of the nanosheets is approximately 5 nm. The content of B is about 15% among the Ni, B, O elements and boron exists mainly in the form of BO 2 − , which was confirmed by XPS characterization. B-α-Ni(OH) 2 nanoflowers exhibit a high specific capacitance of ~2296 F g −1 at a charge and discharge current density of 3 A g −1 with excellent cycling ability. The high specific capacitance and remarkable rate capability are promising for applications of B-α-Ni(OH) 2 nanostructures as advanced electrochemical capacitor materials with both high energy and cycling ability.
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ELECTROCHIMICA ACTA
·
2015
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IF 4.504
Mingshu Xiao,Yanping Tian,Yuhua Yan,Kai Feng,Yuqing Miao
In order to lower the energy barrier and improve the energy efficiency for hydrogen production by splitting water, highly efficient OER catalysts are required. Here, we report the electrodeposition of Ni(OH) 2 /NiOOH in the presence of urea showing the improved electrocatalysis for the hydrogen production in KOH electrolyte. By potential scanning, the Ni(OH) 2 colloid in alkali solution was transformed into the deposited Ni(OH) 2 /NiOOH. The presence of urea facilitates to deposit Ni(OH) 2 /NiOOH with higher electron transfer than the absence of urea, leading to a higher electrocatalytic OER. As supporting electrolyte , KOH exhibits better performance on the electrodeposition of Ni(OH) 2 /NiOOH and their OER electrocatalysis than NaOH. The work shows the potential application using cheap, non-precious metal-based electrocatalysts to overcome the well-known bottlenecks limiting power density of hydrogen fuel cell and energy efficiency of splitting water.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
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IF 8.1
Yijie Yang,Yanjun Yu,Yuanhang Wu,Hongyi Chen,Jie Yang,Yu Luo,Yuan Hu,Congshu Huang,Hui Li,Jianzhi Wang
Designing ultrahigh energy density and mass-loading of electrocatalysts for hydrogen evolution is highly desirable but remains a great challenge. Herein, a 3D high-rise architectural structure consisting of dense Ni(OH) 2 nanoparticles on CuMoO 4 nanocube heterostructure arrays on Ni foam (Ni(OH) 2 /CuMoO 4 /NF) is developed via a hydrothermal reaction, calcination and electrodeposition method. Benefitting from the optimized electronic configuration, hierarchical high-rise architecture, and large specific surface area and mesoporous, the Ni(OH) 2 /CuMoO 4 /NF exhibits superior hydrogen evolution reaction (HER) activity in 1.0 M KOH solution. Ni(OH) 2 /CuMoO 4 /NF only requires low overpotential of 70 mV achieving a current density of 10 mA cm −2 with a low Tafel slope of 80 mV dec −1 , and superior long-term stability toward HER. This work provides a new structural design to high-rise architectural structures for efficient catalytic application.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yi Zhang,Hao Wang,Man Li,Xinhao Sun,Yan Zhang,Zhifeng Wang,Chunling Qin
This work successfully synthesizes a new type of multi-layered flexible hybrid electrode (Cu/Ni(OH) 2 /np-Ni) composing of bimetallic components, hierarchical porous structure and outstanding glucose electrocatalytic performance. The synthesis strategy includes a facile two-step approach, i.e. the Ni(OH) 2 nanolayer in-situ grows on a nanoporous Ni (np-Ni) network (Ni(OH) 2 /np-Ni) via deionized water immersion and then the metallic Cu dendrites are uniformly deposited on Ni(OH) 2 /np-Ni. Moreover, due to the hierarchical porous structure as well as synergetic effect of Ni(OH) 2 and Cu dual electroactive components, the Cu/Ni(OH) 2 /np-Ni hybrid electrode electrodeposited with 1 min delivers wider linear range of 18 mM and higher sensitivity of 1.629 mA mM −1 cm −2 . The electrode possesses excellent interference immunity, reproducibility as well as long-time stability. In addition, the mechanism of electrochemical sensors for detecting glucose under alkaline conditions is briefly introduced. Accordingly, the flexible Cu/Ni(OH) 2 /np-Ni electrode material shows promise for further development as a contender for wearable glucose sensors.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Man Zhao,Liwu Qiang,Meng Bai,He Xiao,Li Zhang,Junming Zhang,Tianjun Hu,Baoliang Lv,Shengxiang Wang,Jianfeng Jia
Rational design of Ni-based electrocatalysts for methanol electrooxidation reaction (MOR) and in-depth understanding of their catalytic mechanism remain a challenge. Herein, carbon dots/graphene heterostructure is constructed to load Ni(OH) 2 and the role of carbon dots focuses on regulating distribution and electronic property of Ni(OH) 2 . Regulation mechanism of carbon dots on Ni(OH) 2 for optimizing MOR activity are revealed by in-situ Raman, in-situ FTIR, operando electrochemical impedance spectroscopy, X-ray absorption fine structure (XAFS) spectroscopy, and so on. It’s found carbon dots could disperse Ni species and regulate their distribution configuration. Appropriate amount of carbon dots promotes the formation of highly dispersed CDs&Ni(OH) 2 type. Because of strong interaction between Ni(OH) 2 and CDs, coordination environment and local electronic structure of Ni in Ni-CDs/G can be regulated by carbon dots, leading to phase-ratio variation of α-Ni(OH) 2 /β‑Ni(OH) 2 and d-band center shift of Ni(OH) 2 . For the best Ni-4CDs/G electrocatalyst, more formed α-Ni(OH) 2 lead to d-band center downshift from the E F level and optimized its adsorption of methanol. Ni-4CDs/G shows the specific activity of 299.2 mA cm −2 and mass activity of 3756.5 mA mg −1 at peak current. In water splitting test, lower initial overpotential of 140 mV is found in methanol electrolysis than that in water electrolysis. This opens a new door to regulate the metal-based electrocatalysts by CDs and will inspire more people to explore CDs-based materials for electrocatalytic application.
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IONICS
·
2024
·
IF 2.4
Wu Fang,Ge Jin-Long,Zhu Yujun,Jiao Yuhong,Wu Zhong,Feng Chao,Zhao Yupei,Li Qiu
The development of high-performance and cost-effective electrocatalysts toward the oxygen evolution reaction (OER) is remarkably desirable but challenging. Herein, we design and fabricate a sea urchin-like S-doped Ni(OH) 2 electrocatalyst on nickel foam using a simple hydrothermal method, followed by treatment with Na 2 S solution. The introduction of S not only modulates the electronic structure of Ni(OH) 2 , but also improves the electronic conductivity, thus enhancing the OER performance of Ni(OH) 2 . Owing to the free-standing feature, modified electronic structure, and sea urchin-like structure, the optimized S-Ni(OH) 2 –30 min delivers excellent OER performance with overpotentials of 306 and 392 mV at 10 and 100 mA cm −2 , respectively, Tafel slope of 89.2 mV dec −1 , and stability for 30 h at 50 mA cm −2 . This work demonstrates the importance of incorporating S in Ni(OH) 2 to optimize the electronic structure for improving OER activity and provides a promising pathway to synthesize Ni(OH) 2 -based electrocatalysts.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Bingchen Li,Zexiong Cui,Yufeng Tao,Jin Xiong,Jinbo Gao,Lihua Liu,Shiwei Song,Pengfei Tian
The slow kinetics of the cathodic hydrogen evolution reaction (HER) present a significant obstacle for alkaline water electrolysis. Consequently, developing non-precious metal HER catalysts with high activity and stability remains a challenge. This study reports a heterostructure catalyst composed of Mo-doped amorphous Ni(OH) 2 nanosheets modified Fe 3 O 4 crystal nanoparticles (Mo-NiOH@Fe 3 O 4 ). This unique structure exhibits a three-dimensional, coral-like structure, which significantly increases the electrochemically active surface area and exposes more active sites to the electrolyte. The incorporation of Mo-doped amorphous Ni(OH) 2 enriches electron density around Fe atoms, modulating their electronic state and optimizing intrinsic activity. As an alkaline hydrogen evolution catalyst, Mo-NiOH@Fe 3 O 4 requires overpotentials of only 23.7 and 140.6 mV to achieve 10 and 100 mA cm −2 , respectively, demonstrating exceptional catalytic activity. Furthermore, it shows negligible performance degradation at 100 mA cm −2 and maintains stability for over 120 h. This work demonstrates that a heterostructure strategy, integrating Mo-doped amorphous Ni(OH) 2 with Fe 3 O 4 , provides a reasonable route for developing low-cost, high-performance HER catalysts.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2025
·Vol. 58
·期 38
·385502
·
IF 3.2
Qixiong Zhang,Jiujun Zhu,Yafei Hou,Qi Yang,Hai Jiang,Jing Cuan,Weiping Li
Dielectric capacitors offer fast charge/discharge rates and high-power density but are limited by low energy density, requiring bulky stacking. Although single-layer composites attempt to combine both high dielectric constant and breakdown strength, a trade-off often limits their effectiveness. To resolve this conflict, sandwich-structured composites spatially separate polarization and insulation functions into different layers. However, the abrupt dielectric contrast at interlayer interfaces often results in localized electric field distortion, undermining breakdown reliability. In this work, we develop filler-gradient composites by varying the loading of Ni(OH)2 nanosheets to construct transitional interlayers. This design mitigates electric field imbalance in conventional sandwich structures, enhancing dielectric constant, breakdown strength, and energy density. The results demonstrate that the filler-gradient structure facilitates uniform electric field distribution and enhanced interfacial polarization, resulting in a high energy density of 21.1J cm−3 at 685.5MV m−1, and discharge efficiency of 70.1%.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jiao Chen,Hongye Qin,Yaping Pan,Jinli Wu,Jianan Liu,Wanying Lin,Jun Jiang,Enzuo Liu,Junwei Sha,Fang He,Liying Ma,Naiqin Zhao
It is necessary and challenging to develop platinum-based electrocatalysts with low Pt content and high performance for industrial development in a suitable strategy. Herein, ultralow Pt (0.35 wt%) loading Ni(OH) 2 nanosheets (named as 2-Pt/Ni(OH) 2 ) with cataphracted structure is synthesized on nickel foam by one-step hydrothermal process. It only needs an overpotential of 34 mV to achieve a current density of 10 mA cm -2 without any significant decrease for 40 hours. This excellent performance of hydrogen evolution reaction (HER) is attributed to the fact that the cataphracted structure not only has a larger active area and more active sites, but also effectively limits the size of Pt nanoparticles to 2~3 nm, which results in a higher active quality. In addition, the relatively simple and easily operational one-step method can reduce the Pt content to 0.35 wt% significantly. This facile strategy opens up new approaches in the rational design and synthesis of low loading Pt electrocatalysts with eminent electrocatalytic activity for industrial production.
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