JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Xudong Zhao,Xiangxi Wang,Lei Chen,Xianglong Kong,Zhi Li,Ying Zhao,Zhuoyan Wu,Tingyu Wang,Zhiliang Liu,Piaoping Yang
Exploring low-cost and high-activity transition metal-based electrocatalysts for oxygen evolution reaction (OER) is critical toward mass hydrogen generation by water splitting. Herein, a cheap Fe element doped flower-like nickel sulfides catalyst (Fe-NiS/NiS 2 ) is designed and synthesized through facile electrostatic adsorption and sulfuration methods. It is investigated that the Fe doping effectively induces the lattice contraction of nickel sulfides and regulates the phase composition and heterogeneous interfaces, thus enabling high intrinsic OER activity. The Fe-NiS/NiS 2 catalyst shows a high electrochemically active surface area of 150 cm 2 , a small overpotential of 361 mV at 100 mA cm −2 and a low Tafel slope of 61.5 mV dec -1 . Furthermore, the Fe-NiS/NiS 2 exhibits a very excellent structure and performance stability without current attenuation for 24 h at 1.50 V versus reversible hydrogen electrode. This work provides an important insight for the exploitation of low-cost and high-performance OER catalysts with cheap Fe element doping metal sulfides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Fanjia Sun,Xueqing Tian,Jianbing Zang,Rui Zhu,Zhiwei Hou,Youbin Zheng,Yanhui Wang,Liang Dong
Transition metal sulfides, recognized for their platinum-like activity, were prominent in electrolytic water hydrogen production research. In this context, we reported a NiS/NiS 2 heterostructure composite active center electrocatalyst optimized by Cr doping (Cr-NiS/NiS 2 @NF) based on the dual regulation of defect engineering and interface engineering. The electronic structure of Ni and S could be adjusted by Cr doping, and the creation of defects exposed more active sites. Meanwhile, the resulting NiS/NiS 2 heterogeneous interface acted as a composite activity center, enhancing the alkaline HER process rate. The Cr-NiS/NiS 2 @NF achieved 100 mA cm −2 at an overpotential of 172.8 mV. Density functional theory analysis confirms the significant decrease in the water dissociation potential barrier, attributable to the electron redistribution caused by Cr doping. The optimized heterointerface functioned as a composite activity center. Here, the Cr-NiS component effectively facilitated water dissociation, while the NiS 2 component primarily enhanced H 2 generation and desorption. The introduction of Cr significantly improved the electronic coupling at the bi-phase interfaces, thereby accelerating the transport of hydrogen intermediates. This study revealed the modulation of electron distribution at the Cr-doped nickel sulfide heterointerface, offering deep atomic-scale insights. These findings provide novel perspectives for the field of hydrogen production via water electrolysis.
研究领域:
材料科学
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催化化学
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能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Aifeng Liu,Guangshuo Wang,Hongwei Che
Ni-based metal-organic frameworks (Ni-MOFs) as electrode materials for hybrid supercapacitors face challenges including low actual specific capacity and poor cyclic stability due to their inherent low electrical conductivity and inadequate active site accessibility. Herein, Ni-BTC@NiS 2 heterostructures are designed and synthesized by in situ decoration of NiS 2 nanoparticles onto the surface of Ni-BTC microflowers employing a solvothermal reaction followed by a controlled partial sulfurization treatment. The optimized Ni-BTC@NiS 2 heterostructures as electrode materials demonstrate a maximum capacity value of 604 C g −1 at 1 A g −1 and an initial capacity retention of 91.1 % after 5000 cycles, both of which are significantly higher than those of pure Ni-BTC and NiS 2 electrodes. Furthermore, an assembled two-electrode hybrid supercapacitor device with Ni-BTC@NiS 2 as positive electrode can deliver an maximum energy density of 45.9 Wh kg −1 at 801 W kg −1 . Theoretical and experimental analyses indicate that the integration of Ni-BTC with NiS 2 enhances electronic states near the Fermi level, thereby improving electrical conductivity of Ni-BTC@NiS 2 heterostructures. Meanwhile, a built-in electric field exists at the Ni-BTC/NiS 2 interface, which not only accelerates interfacial charge transport but also enhances surface OH - adsorption, thereby significantly improving charge storage capability. In addition, the surface decoration of NiS 2 nanoparticles on N-BTC microflowers provide additional active sites. Our findings provide a promising strategy for further exploring the application potential of Ni-MOF-based heterostructures in advanced hybrid supercapacitors.
研究领域:
材料科学
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储能技术
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电化学
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纳米材料
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金属有机框架（MOFs）
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 1
·1805298
·
IF 13.325
Li An,Jianrui Feng,Yu Zhang,Rui Wang,Hanwen Liu,Gui-Chang Wang,Fangyi Cheng,Pinxian Xi
Developing bifunctional efficient electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is in high demand for the development of overall water-splitting devices. In particular, the electrocatalytic performance can be largely improved by designing positive nanoscale-heterojunction with well-tuned interfaces. Herein, a novel top-down strategy is reported to construct the oxide/sulfide heterostructures (N-NiMoO 4 /NiS 2 nanowires/nanosheets) as a multisite HER/OER catalyst. Starting with the NiMoO 4 nanowires, nitridation in a controlled manner enables activation of Ni sites in NiMoO 4 and then yields oxide/sulfide heterojunction by directly vulcanizing the highly composition-segregated N-NiMoO 4 nanowires. The abundant epitaxial heterogeneous interfaces at atomic-level facilitate the electron transfer from N-NiMoO 4 to NiS 2 , which further cooperate synergistically toward both the hydrogen and oxygen generation in alkali solution. Furthermore, with N-NiMoO 4 /NiS 2 grown carbon fiber cloth as the engineering electrode, the assembled N-NiMoO 4 /NiS 2 –N-NiMoO 4 /NiS 2 system can deliver a current density of 10 mA cm −2 with the cell voltage of 1.60 V in the water-splitting reaction. This current density is 3.39 times higher than that of the Pt–Ir set (2.95 mA cm −2 ). The excellent catalytic performance offered of N-NiMoO 4 /NiS 2 nanowires/nanosheets presents a great example to demonstrate the significance of interface engineering in the field of electrocatalysis.
研究领域:
电催化
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材料科学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 42
·1703779
·
IF 12.124
Li An,Yuxuan Li,Mingchuan Luo,Jie Yin,Yong-Qing Zhao,Cailing Xu,Fangyi Cheng,Ying Yang,Pinxian Xi,Shaojun Guo
The exploration of highly efficient nonprecious metal bifunctional electrocatalysts to boost oxygen evolution reaction and oxygen reduction reaction is critical for development of high energy density metal-air batteries. Herein, a class of CuS/NiS 2 interface nanocrystals (INs) catalysts with atomic-level coupled nanointerface, subtle lattice distortion, and plentiful vacancy defects is reported. The results from temperature-dependent in situ synchrotron-based X-ray absorption fine spectroscopy and electron spin resonance spectroscopy demonstrate that the lattice distortion of 14.7% in CuS/NiS 2 caused by the strong Jahn–Teller effect of Cu, the strong atomic-level coupled interface of CuS and NiS 2 domains, and distinct vacancy defects can provide numerous effective active sites for their excellent bifunctional performance. A liquid Zn-air battery with the CuS/NiS 2 INs as air electrode displays a large peak power density (172.4 mW cm −2 ), a high specific capacity (775 mAh g Zn −1 ), and long cycle life (up to 83 h), making the CuS/NiS 2 INs among the best bifunctional catalysts for Zn-air battery. More remarkably, the flexible CuS/NiS 2 INs-based solid-state Zn-air batteries can power the LED after twisting, making them be promising in portable and wearable electronic devices.
研究领域:
材料科学
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电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 39
·20985-20992
·
IF 8.867
Tian Tian,Lan Huang,Lunhong Ai,Jing Jiang
Exploring highly efficient and low cost electrocatalysts for the hydrogen evolution reaction (HER) remains a significant challenge in the renewable energy area. In this study, we report a novel metal–organic framework (MOF)-engaged microwave sulfurization strategy to synthesize pyrite-structured nickel disulfide microspheres (NiS2 HMSs) with a well-defined hollow morphology and surface anion modification. The resulting NiS2 HMSs exhibit excellent performance for electrocatalyzing the HER with expected activity and durability. The optimized NiS2 HMSs need only 219 mV to offer a current density of 10 mA cm−2 for the HER in alkaline medium, and compare favorably to previously reported Ni-based nonprecious electrocatalysts and even outperform most of the nickel sulfide-based electrocatalysts. This work will open a new avenue for the preparation of various surface anion-rich metal sulfides from the corresponding MOFs for electrocatalytic water splitting.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hao Guo,Licheng Tang,Qianqiu Tian,Ying Chu,Bin Shi,Xucai Yin,Hua Huo,Xiaopeng Han,Chengxiang Yang,Chu Wang,Kangkang Tang,Chang Wang,Xiaohong Zhang,Jianyong Wang,Long Kong,Zhouguang Lu
Transition-metal sulfides are key cathode materials for thermal batteries used in military applications. However, it is still a big challenge to prepare sulfides with good electronic conductivity and thermal stability. Herein, we rapidly synthesized a Co-doped NiS2 micro/nanostructure using a hydrothermal method. We found that the specific capacity of the Ni1–xCoxS2 micro/nanostructure increases with the amount of Co doping. Under a current density of 100 mA cm–2, the specific capacity of Ni0.5Co0.5S2 was about 1565.2 As g–1 (434.8 mAh g–1) with a cutoff voltage of 1.5 V. Owing to the small polarization impedance (5 mΩ), the pulse voltage reaches about 1.74 V under a pulse current of 2.5 A cm–2, 30 ms. Additionally, the discharge mechanism was proposed by analyzing the discharge product according to the anionic redox chemistry. Furthermore, a 3.9 kg full thermal battery is assembled based on the synthesized Ni0.5Co0.5S2 cathode materials. Notably, the full thermal battery discharges at a current density of 100 mA cm–2, with an operating time of about 4000 s, enabling a high specific energy density of around 142.5 Wh kg–1. In summary, this work presents an effective cathode material for thermal battery with high specific energy and long operating life.
研究领域:
材料科学
·
电化学
·
储能技术
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）