INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·Vol. 47
·期 33
·14916-14929
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IF 7.139
Hongzhi Wang,Chunxiao Wang,Weiguo Zhang,Suwei Yao
Developing non-noble metal catalysts with excellent electrocatalytic performance and stability is of great significance to hydrogen production by water electrolysis, but there are still problems of low activity, complex preparation and high cost. Herein, we fabricated a novel Ni 3 S 2 /Ni(OH) 2 dual-functional electrocatalyst by a one-step fast electrodeposition on nickel foam (NF). While maintaining the electrocatalytic performance of Ni 3 S 2 , the existence of heterostructure and Ni(OH) 2 co-catalyst function greatly improves the overall water splitting performance of Ni 3 S 2 /Ni(OH) 2 –NF. Hence, It shows a low overpotential of 66 mV at 10 mA cm −2 for HER and 249 mV at 20 mA cm −2 for OER. The dual-functional electrocatalyst needs only 1.58 V at 20 mA cm −2 when assembled two-electrode electrolytic cell. Impressively, the electrocatalyst also shows outstanding catalytic stability for about 800 h when 20 and 50 mA cm −2 constant current was applied, respectively which demonstrates a potential electrocatalyst for overall water splitting.
研究领域:
材料科学
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电化学
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能源催化
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纳米材料
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可持续能源
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功能材料
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界面化学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Qingnan Wu,Ming Wen,Shipei Chen,Qingsheng Wu
Ni(OH) 2 /CNTs/Ni(OH) 2 lamellar-crossing-nanostructure with a single lamellar spacing of ∼5 nm was effectively constructed through two-phase-interface reaction process followed by the CNTs crossed among the lamellar-nanostructured Ni(OH) 2 . The resultant nanocomposite can offer large active surface areas and short diffusion paths for electrons and ions, and is investigated as a potential pseudocapacitor electrode material for electrochemical energy storage applications. Electrochemical data demonstrate that the as-prepared nanocomposite exhibits a high specific capacitance of ∼1600 F g −1 at the scan rate of 1 mV s −1 in 6 M KOH solution at normal pressure and temperature, which is great higher than Ni(OH) 2 (∼1200 F g −1 ). Furthermore, Ni(OH) 2 /CNTs/Ni(OH) 2 nanocomposite shows a higher energy density (∼125 Wh kg −1 , 2 A g −1 ) and has a slightly decrease of 5% in specific capacitance after 1000 continuous charge/discharge cycles.
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高影响因子
Chemistry-An Asian Journal
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2024
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IF 3.5
Xinxin Dai,Zhen Tang,Xinyuan Yan,Shiyi Tao,Shanshan Wang,Yi Liu,Jiafeng Cao,Xiaolong Deng,Xin Bo
The exploring and developing non-precious transition metal-based catalysts for practical water electrolysis with the low cost, high efficiency and easy macroscopic preparation was still a challenge. Herein, Ni 3 S 2 /Ni(OH) 2 heterojunction with different sulfuration time was proposed and hydrothermally synthesized using a simple two-step approach, which served as a bifunctional electrocatalyst for water splitting in alkaline solution at industrial temperature. Among these catalysts, Ni 3 S 2 /Ni(OH) 2 -5h displayed the smallest overpotentials (237 mV@100 mA cm −2 and 360 mV@100 mA cm −2 ) for OER and HER at room temperature, along with low Tafel slopes of 62.0 mV dec −1 and 80.8 mV dec −1 respectively. Furthermore, working at high temperature Ni 3 S 2 /Ni(OH) 2 -5h exhibited even lower overpotential of 82 mV@100 mA cm −2 at 70 °C for OER and 325 mV@100 mA cm −2 at 60 °C for HER. The excellent performance was ascribed to the heterojunction accelerating the charge transfer, hierarchical interconnected structure promoting the mass transfer and the synergistic effect between the components of Ni 3 S 2 and Ni(OH) 2 . This work could provide a promising route for promoting the electrocatalytic performance of Ni-based catalyst with a simple sulfuration method for industrial water splitting, which could expand to other non-noble metal-based materials for enhancing the electrocatalytic activities.
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 34
·345706
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IF 3.874
Leqiu He,Yan Wang,Yajie Guo,Guobing Li,Xubin Zhang,Wangfeng Cai
Novel core−shell nanostructure electrodes benefit from the excellent properties of their constituent materials, as well as the synergy between them. However, it is challenging to fabricate such structures efficiently. In this study, NiSe nanorods were fabricated using Ni foam as the conductive substrate and reactant via a one-step hydrothermal process, and Ni(OH)2 nanosheets were coated on the surface of the nanorods via one-step electrodeposition. The effect of the structure and morphology on the properties of the material was explored using scanning electron microscopy, x-ray diffraction, and electrochemical technology. The obtained core−shell NiSe/Ni(OH)2 exhibited an areal capacity of 1.89 mAh cm−2 at a current density of 5 mA cm−2. The assembled NiSe/Ni(OH)2//AC hybrid supercapacitor exhibited excellent energy and power densities, indicating that NiSe/Ni(OH)2 has great potential for use as a battery-type electrode in energy storage systems.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2026
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IF 5.8
Xinpu Yang,Zhanwen Wang,Siqi Chen,Yuan He,Gang Wang,Xiping Yang,Mingxia Lu
A Ni(OH)2/reduced graphene oxide (rGO) nanocomposite with a well-defined hexagonal nanosheet morphology was synthesized via a one-step hydrothermal approach using graphene oxide (GO) and nickel sulfate hexahydrate (NiSO4·6H2O) as precursors. Crucially, a commercial-level high mass loading of 8 mg·cm–2 was successfully achieved on the electrode. Structural analysis confirmed that the incorporation of rGO effectively prevents the agglomeration of Ni(OH)2 nanosheets, while forming an interconnected three-dimensional (3D) conductive network. This unique structure enhances the overall electrical conductivity and facilitates rapid ion diffusion even under heavy mass loading conditions. Electrochemical characterization in a three-electrode system revealed that the composite synthesized with a GO concentration of 1 mg·mL–1 (NG-1) exhibited remarkable rate capability across current density ranging from 0.5 to 5 A·g–1. At a current density of 0.5 A·g–1, it delivered a superior specific capacity of 369.5 C·g–1. When assembled into an asymmetric supercapacitor with activated carbon (AC), the hybrid device delivered a specific capacitance of 101.6 F·g–1 (174.4 C·g–1) at 0.5 A·g–1. More remarkably, it demonstrated exceptional cycling stability with 102.2% initial capacitance retention after 10,000 charge–discharge cycles at 2 A·g–1, confirming the excellent electrochemical stability of the NG-1 electrode. Notably, the assembled device attained an energy density of 36.12 Wh·kg–1 at a power density of 400 W·kg–1, significantly surpassing conventional electrochemical double-layer capacitors. The Ni(OH)2/rGO nanocomposites developed in this work combine facile synthesis with outstanding electrochemical properties, providing a promising material solution for high-power energy storage applications.
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高影响因子
Nanoscale
·
2018
·Vol. 11
·期 3
·1058-1064
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IF 7.233
Yu Ding,Ying Li,Yuanyuan Xue,Boqiang Miao,Shuni Li,Yucheng Jiang,Xien Liu,Yu Chen
Atomically thick ultrathin nanomeshes (NMs) possessing the inherent advantages of both two-dimensional nanomaterials and porous nanomaterials are attracting increasing interest in catalysis and electrocatalysis. Herein, we report a direct chemical synthesis of atomically thick Ni(OH)2-NMs by a NaBH4 assisted cyanogel hydrolysis method, which overcomes the shortcoming of the post-etching method for NM synthesis. Various physical characterization methods show that the as-synthesized Ni(OH)2-NMs have 1.7 nm thickness, a big surface area, abundant nanoholes, and numerous surface/edge atoms with low-coordination numbers. The as-synthesized Ni(OH)2-NMs show a better electrocatalytic performance for the urea oxidation reaction than conventional Ni(OH)2 nanoparticles without holes in the alkaline electrolyte, including a lower onset oxidation potential, faster reaction kinetics, and higher mass activity.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Weijun Liang,Senlin Wang,Yanxiu Zhang,Jian Gu,Kaida Zhu,Jing Zhong,Xinru Wang
β-Ni(OH) 2 with good crystallinity is grown on the surface of the flower-like α-Ni(OH) 2 to form a 3D α@β-Ni(OH) 2 material by a two-step hydrothermal method . The synthesized β-Ni(OH) 2 is nanometer size and strong alkali stability, while the α-Ni(OH) 2 has a large specific surface, high specific capacity and good electrical conductivity , so there are multiple synergistic effects between the β-Ni(OH) 2 coating and the α-Ni(OH) 2 core. Coupled with a 3D flower-like structure, the obtained α@β-Ni(OH) 2 electrode shows a high capacity of 431 mAh g −1 at a current density of 1 A g −1 . Furthermore, we use the α@β-Ni(OH) 2 electrode and the activated carbon (AC) electrode to assemble an asymmetric supercapacitor (ASC) device. This ASC shows the excellent energy density of 53 Wh kg −1 at a power density of 875 W kg −1 and capacity retention rate of 78% after 5000 cycles. Finally, metal hydride (MH) is used to replace the AC negative electrode, and a cell with a high energy density of 100.17 Wh kg −1 at a power density of 424.75 W kg −1 is obtained. The results show that α@β-Ni(OH) 2 electrode has better electrochemical performance than commercial electrodes and has application prospects in energy storage.
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高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Taozhu Li,Yu Liang
The application of NiTi alloys in the electrooxidation of urea is primarily based on their unique electrochemical activity and stable chemical properties. It has been found that during electrochemical cyclic voltammetry treatment, a Ni(OH)2 layer with high catalytic activity can be formed on the surface of NiTi alloys, which significantly enhances the efficiency of urea electrooxidation. Electrochemical studies reveal that NiTi@Ni(OH)2 exhibits voltage-dependent selectivity between urea oxidation and water oxidation. When the applied potential is less than 1.47 V, the electrode undergoes urea oxidation; in contrast, when the applied potential exceeds 1.54 V, the electrode reaction switches to water oxidation. That is, the selectivity between urea oxidation and water oxidation can be achieved by adjusting the applied potential, which provides a new approach for the selectivity control of electrochemical reactions.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Hengrui Qiu,Shengli An,Xuejiao Sun,Huimin Yang,Yongqiang Zhang,Wenxiu He
Due to the unconventional properties of MWCNTs-GONRs (multiwalled carbon nanotubes-graphene oxide nanoribbons), we have tried to use it as a carbon resource for supercapacitors . MWCNTs-GONRs/Ni(OH) 2 electrode was obtained by hydrothermal method . Velvet α-Ni(OH) 2 was prepared above NF (nickel-foam) loaded with MWCNTs-GONRs. This layered design can effectively promote the diffusion of ions and increase the active site for MWCNTs-GONRs/Ni(OH) 2 electrode, thus enhancing the electrochemical performance. The electrode exhibits extraordinary electrochemical performances in electrochemical testing, such as supernal specific capacitance (1713.2 F g −1 ) and prominent working time. In addition, supercapacitors was assembled with MWCNTs-GONRs/Ni(OH) 2 and active carbon as materials. Which represents a prominent energy density (41.23 Wh kg −1 ), high power (6.80 kW kg −1 ) and prominent cycling stability property (95.18%, 3000 times). The electrode prepared in this work provides a clue to enlighten people for energy storage.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
·
IF 2.6
Li Gang,Ren Haifang,Geng Chunping,Wu Xiang
Electrical energy storage devices (EES) play an important role in the development of portable electronic devices, power grids, and electric vehicles. Supercapacitors (SCs) become the focus of the EES field due to their high power density and high energy density. ZnCo 2 O 4 ternary metal oxides show considerable potential as electrodes for SCs. In this work, Ni(OH) 2 and PPy materials are combined on the surface of ZnCo 2 O 4 samples. The synthesized products possess a specific capacitance of 1256 C/g at 1 A/g and an energy density of 69 Wh/kg at 1350 W/kg. Moreover, the assembled device retains 81% of its capacity after being fully charged and discharged 10,000 times.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuyu Li,Fang Luo,Yuhua Xie,Chaofeng Chang,Ming Xie,Zehui Yang
Urea oxidation reaction (UOR) is a promising substitution of oxygen evolution reaction (OER) in overall water splitting technology because of the lower theoretical potential; thereby, a win-win benefit is achieved due to the simultaneous hydrogen generation and water purification . The efficient UOR catalysis substantially depends on the exposed active sites and mass transfer resistance, especially at high current density to meet the requirement of industrial water splitting technology. In this work, we have synthesized α-Ni(OH) 2 porous nanoflowers (α-Ni(OH) 2 –PNF) using ZIF-67 as template. Ascribing to the Kirkendall effect , nanopores are created on α-Ni(OH) 2 nanosheets benefiting for the formation of abundant oxygen vacancies as well as drop-off in mass transfer resistance during UOR catalysis. Meanwhile, the binding strength between active site and CO 2 , rate-determining step of UOR, is weakened by oxygen vacancies; as a result, only 1.477 V vs. RHE is demanded for α-Ni(OH) 2 –PNF to catalyze UOR with 100 mA cm −2 , 67 mV lower than α-Ni(OH) 2 nanosheets. Besides, an exceptional stability is also achieved for α-Ni(OH) 2 –PNF with negligible degradation during 20 h catalysis.
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高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 11
·1151-1156
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IF 0.975
Min Shi,Yanhong Li,Hongtao Cui
A facile strategy for the preparation of composites with homogeneous distribution of multi-walled carbon nanotubes (MWCNTs) in Ni(OH) 2 was proposed. The electrostatic attraction between positively charged Ni(OH) 2 monolayer nanosheets and negatively charged MWCNTs was utilised to self-assemble the composites. The results of electrochemical measurement on the composite containing 30 wt% MWCNTs indicated that the homogeneous composition of MWCNTs in composite significantly reduced the electrical resistance and promoted the electrochemical utilisation of Ni(OH) 2 . As a result, the composite presented high electrochemical performance: having specific capacitance of 1568.8 F g −1 at low current density of 2.4 A g −1 and keeping a relatively high specific capacitance of 781.8 F g −1 at high current density of 81.7 A g −1 . Based on the results in this works, it is hoped that the adopted strategy could provide a promising idea for the preparation of composites with homogeneous distribution of individual components.
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高影响因子
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