JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Hongzhi Wang,Xiangcheng Shen,Weiguo Zhang,Suwei Yao
The synthesis of low-cost transition metal bifunctional electrocatalysts that can replace noble metals is crucial for realizing high efficiency hydrogen production from industrial water splitting. Herein, a novel binder-free amorphous/crystalline NiFeS@Ni 0.85 Se bifunctional electrocatalyst material has been fabricated on nickel foam (NF) via a straightforward two-step electrodeposition method. The electrode features a unique structure in which NiFeS nanosheets of uniform size grow on Ni 0.85 Se microspheres, thus providing more active sites. It exhibits a minimal overpotential of 63 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and 311 mV at 100 mA cm −2 for oxygen evolution reaction (OER). Impressively, when assembled into an electrolytic cell, the electrocatalyst can reach 10 mA cm −2 at just 1.51 V and remains stable for 220 h. Additionally, at 1.68 V, the catalyst reaches 50 mA cm −2 and maintains stable operation for 140 h, demonstrating outstanding water splitting potential. This paper presents a composite material that combines the crystalline and amorphous states, allowing them to complement each other and jointly promote catalytic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanyan Wu,Ying Li,Mengke Yuan,Hongru Hao,Xiaojiao San,Zhe Lv,Lingling Xu,Bo Wei
Earth-abundant catalysts for both Oxygen evolution reaction (OER) and Hydrogen evolution reaction (HER) are highly required for electrochemical water splitting. Transition metal sulfides have been considered as efficient catalysts for both OER and HER, but their real active species in operation condition are still controversial. Herein, self-supported Ni 3 S 2 /FeNi 2 S 4 nanosheets (Ni-Fe-S) are synthesized and in-situ Raman measurement is conducted to monitor the phase transformation under realistic conditions. Combined with a series of ex-situ technologies , it can be concluded that, Ni-Fe-S nanosheets function as pre-catalysts which undergo dynamically structural reconstruction during electrolysis. The active species are determined to be γ-NiOOH for OER and metallic Ni 0 for HER in 1 M KOH media, respectively. As-converted products only need overpotentials of 50 mV for HER and 201 mV for OER to achieve the current density of 10 mA cm - 2 , respectively. A two-electrode electrolyzer can afford a current density of 10 mA cm - 2 at a low cell voltage of 1.55 V. This work provides new perspectives to recognize the catalytic evolution process of nickel-based sulfides for water splitting and sheds light on the rational design of bifunctional materials in energy devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hong Wang,Huimin Jiang,Chang Gao,Yanzhen Qiu,Hui Guo,Jingpeng Zhang,Mohammed A. Amin,Jianjian Lin
With the development and progress of society, there is an increasing demand for hydrogen energy. Developing efficient, low-cost catalysts for electrolytic hydrogen production is a challenging but significant task. In this work, we successfully achieved the in-situ growth of FeS/Fe 5 Ni 4 S 8 heterostructure catalyst on the surface of iron foam through a one-step solvothermal method. The heterostructure can produce more lattice defects. Additionally, the unique synergistic effect between Ni and Fe, along with rapid electron transfer kinetics at the heterointerface, collectively enhancing the electrocatalytic performance of the FeS/Fe 5 Ni 4 S 8 heterostructure nanomaterials. In 1 M KOH electrolyte, this catalyst achieves low overpotentials of only 181 mV and 193 mV for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), at the current density of 10 mA cm -2 , with Tafel slopes of 23.14 mV dec -1 and 88.21 mV dec -1 . After 200 h of OER and overall water splitting stability testing, the current density remains stable, providing insights into exploring efficient NiFe-based electrocatalysts.
研究领域:
材料科学
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能源化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Rongbin Lin,Xiaoliang Zhang,Hai Li,Jinchun Tu,Cong Li,Zaowen Zhao,Weiwei Li,Lei Ding
Seawater electrolysis offers a viable strategy for the large-scale production of clean hydrogen. However, the oxygen evolution reaction (OER) catalysts is often compromised by the competitive chloride evolution reaction and the associated corrosion in seawater environments. Herein, we present a novel NiFe-S aerogel (AG) electrocatalyst featuring a porous 3D-network structure and a core–shell architecture. This catalyst demonstrates outstanding OER performance, achieving a low overpotential of 260 mV at 100 mA cm −2 , a Tafel slope of 55 mV dec -1 , and remarkable stability exceeding 500 h at 500 mA cm −2 in alkaline natural seawater. Through combined experimental and computational analyses, we discovered that the self-reconstructed crystalline-amorphous (Ni,Fe)OOH/NiFeS 2 heterojunction is pivotal to the outstanding performance of the NiFe-S AG electrocatalyst. The unique heterostructure facilitates electron transfer and down shifts the d-band center of the active sites, optimizing the adsorption strength of oxygen-containing intermediate species. Moreover, the stability is augmented by increased Fe and Ni vacancy formation energies, and higher affinity for OH – over Cl - , hence attenuating the corrosion from Cl - and suppressing the leaching of active sties. This work highlights the significance of the crystalline-amorphous heterojunction in aerogel catalyst and offers new insights into the design of efficient electrocatalysts for seawater oxidation.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jiayi Zhang,Yu Zeng,Tanyang Xiao,Song Tian,Jing Jiang
Electrolysis of infinite seawater is a promising and sustainable approach for clean hydrogen production. However, it remains a big challenge to accomplish corrosion-resistant and chlorine-free seawater electrolysis at low power input. Herein, the bimetallic nickel–iron sulfide-based electrocatalytic nanoarrays are constructed by a facile hydrothermal sulfidation of redox-etched iron foam (IF), which manifests an effective and reliable strategy for the sulfion oxidation reaction (SOR) to assist alkaline seawater electrolysis for the achievement of energy-saving hydrogen production and value-added sulfion upcycling. The resulting NiFeSx/FeNi3/IF required 0.353 and 0.415 V vs RHE for SOR at current densities of 50 and 100 mA cm–2, which are considerably lower than the theoretical potential of the oxygen evolution reaction (OER, 1.23 V vs RHE). In situ spectroscopy analysis demonstrated efficient sulfion oxidation on the surface of NiFeSx/FeNi3/IF. Furthermore, the NiFeSx/FeNi3/IF-assembled electrolyzer delivered a greatly reduced cell voltage of 0.92 V at 50 mA cm–2 and maintains excellent durability for 30 h, achieving high Faradaic efficiency for both hydrogen production and sulfion degradation. In addition, under natural sunlight (660.4 W m–2), only a 0.947 V voltage of the solar panel smoothly powers the SOR-coupled seawater electrolysis for green hydrogen production and economic sulfur recovery.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
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2022
·
IF 8.047
Qinglin Han,Yuhong Luo,Guihua Liu,Yanji Wang,Jingde Li,Zhongwei Chen
Transition metal phosphides (TMPs) and sulfides (TMSs) are widely-reported electrocatalysts for hydrogen evolution reaction (HER) in alkaline media. However, the origin of their high HER catalytic activity remains unclear. Herein, the transition of Ni x Fe 1-x P and Ni x Fe 1-x S in catalyzing HER reaction is systematically investigated by X-ray photoelectron spectroscopy and in-situ Raman technique. It was found that, during HER reaction, dissolution of S and P occurs and is accompanied with dynamic evolution of the catalyst surface. The dissolution of P in Ni x Fe 1-x P leads to in-situ generation of α-FeOOH species, whereas Ni x Fe 1-x S is found partially transformed into γ-FeOOH phase. Density functional calculations reveal that the α-FeOOH (1 1 1) surface exhibits more delocalized electrons offering promoted HER reaction kinetics over γ-FeOOH (0 1 0), and thus contributes the improved activity of Ni x Fe 1-x P pre-catalyst. This study unveils the distinct origin of HER activity of TMPs and TMSs, providing potential guidance for the rational design of active HER electrocatalysts.
研究领域:
电化学
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材料科学
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催化作用
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2023
·
IF 9.3
Yujun Han,Xin Zeng,Yuhang Liu,Shuanzhen Shi,Pan Xiong,Tongzhou Wang,Xiangmin Pan,Jihong Li,Wenbin Hu,Yida Deng
Electrochemical water splitting, hailed for its cost-effectiveness and eco-friendliness in hydrogen energy production, faces a significant impediment in the form of the oxygen evolution reaction (OER), characterized by inherently slow kinetics. Addressing this challenge, the utilization of crystalline-amorphous (c-a) heterostructures , offering precise interface modulation, emerges as a promising solution. In this study, we report the synthesis of a robust electrode comprising of crystalline Ni 4.5 Fe 4.5 S 8 nanospheres integrated with amorphous NiFeS nanosheets (denoted as NiFeS-TH) using a hydrothermal approach. Remarkably, this electrode exhibits exceptional performance in alkaline electrolytes , requiring a mere overpotential of 420 mV to attain a current density of 2 A/cm 2 . This enhanced OER performance is attributed to the substantial electrochemically active surface area and the presence of compressive strain at the interfaces. These profound insights into heterostructure design hold the potential to revolutionize the tailoring and optimization of OER efficiency.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuan-Yuan Feng,Gao Deng,Xiang-Yu Wang,Meng Zhu,Qing-Nan Bian,Ben-Shuai Guo
Searching for efficient, stable and low-cost nonprecious catalysts for oxygen and hydrogen evolution reactions (OER and HER) is highly desired in overall water splitting (OWS). Herein, presented is a nickel foam (NF)-supported MoS 2 /NiFeS 2 heterostructure , as an efficient electrocatalyst for OER, HER and OWS. The MoS 2 /NiFeS 2 /NF catalyst achieves a 500 mA cm −2 current density at a small overpotential of 303 mV for OER, and 228 mV for HER. Assembled as an electrolyzer for OWS, such a MoS 2 /NiFeS 2 /NF heterostructure catalyst shows a quite low cell voltage (≈1.79 V) at 500 mA cm −2 , which is among the best values of current non-noble metal electrocatalysts. Even at the extremely large current density of 1000 mA cm −2 , the MoS 2 /NiFeS 2 /NF catalyst presents low overpotentials of 314 and 253 mV for OER and HER, respectively. Furthermore, MoS 2 /NiFeS 2 /NF shows a ceaseless durability over 25 h with almost no change in the cell voltage. The superior catalytic activity and stability at large current densities (>500 mA cm −2 ) far exceed the benchmark RuO 2 and Pt/C catalysts. This work sheds a new light on the development of highly active and stable nonprecious electrocatalysts for industrial water electrolysis .
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-9
·
IF 4.122
Xu Peiman,Li Jingwei,Luo Jiaxian,Wei Licheng,Zhang Dawei,Zhou Dan,Xu Weiming,Yuan Dingsheng
Earth-abundant and efficient bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly significant for renewable energy systems. However, the performance of existing electrocatalysts is usually restricted by the low electroic conductivity and the limited amount of exposed active sites. In this work, (Fe 0.2 Ni 0.8 ) 0.96 S tubular spheres supported on Ni foam have been prepared by a sulfuration of FeNi layered double hydroxide spheres grown on Ni foam. Benefiting from the unique tubular sphere architecture, the rich inner defects and the enhanced electron interactions between Fe, Ni and S, this electrocatalyst shows low overpotential of 48 mV for HER at 10 mA cm −2 in 1.0 mol L −1 KOH solution, which is one of the lowest value of non-previous electrocatalyts for HER in alkaline electrolyte. Furthermore, assembled this versatile electrode as an alkaline electrolyzer for overall water splitting, a current density of 10 mA cm −2 is achieved at a low cell voltage of 1.56 V, and reach up to 30 mA cm −2 only at an operating cell voltage of 1.65 V.
研究领域:
材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yuzhen Zhang,Huajun Zhou,Peihua Zhao,Kai Yuan,Rui Zhou,Yongping Qu,Yanzhong Wang
The oxygen evolution reaction (OER) is a complex four-electron transfer process that poses a significant challenge to the efficient production of hydrogen through water splitting. However, developing non-noble metal electrocatalyst with excellent OER performance is still a big challenge. Herein, we propose a new strategy for the in-situ growth of two-dimensional amorphous/crystalline thiophene-based Ni-Fe metal–organic frameworks (MOFs) using Ni-Fe foam (NFF) as metal source and current collector, and thiophene-2,5-dicarboxylic acid (TDC) as corrosion agent and ligand. TDC was ionized at high temperature to produce H + ions that etch NFF to release Ni 2+ and Fe 2+ ions, which were coordinated with TDC to in situ synthesize two-dimensional Ni-Fe thiophenedicarboxylate coordination polymer (NiFe-TDC) nanobelts on NFF. The unique structure and synergistic effect of Ni and Fe ions of NiFe-TDC 0.05 result in the excellent OER performance with an overpotential of 224 and 256 mV at current densities of 10 and 100 mA cm −2 , respectively, and it can run stably for 100 h at a current density of 100 mA cm −2 , indicating the outstanding stability. Furthermore, NiFe-TDC 0.05 remains the excellent OER performance with an extremely low potential of 196 and 271 mV at current densities of 10 and 100 mA cm −2 in seawater with 1 mol L -1 (M) KOH, respectively. The assembled NiFe-TDC 0.05 || Pt/C water electrolysis cell achieves a current density of 100 mA cm −2 at a low voltage of 1.78 V. The work provides a new method to prepare two dimensional MOFs for efficient water oxidation.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Haodong Sun,Lulu Zheng,Yaru Xi,Shangru Zhai,Qingda An,Zuoyi Xiao
Biomass-based carbon electrode material with hierarchical porous structure is considered as a promising candidate for supercapacitor applications, which could enhance the electron transfer and shorten the ion diffusion pathways. However, the low energy density of carbon-based materials seriously affects their wide applications. Herein, 3D N-doped hierarchical porous carbon coupled with nickel-iron sulfide nanoparticles (Fe 5 Ni 4 S 8 /FeS@N-HPC) is fabricated by a simple pyrolysis process . The 3D N-doped interconnected porous structure with large specific surface area provides more channels for ion transport and electron transfer. The nickel-iron sulfide nanoparticles in the porous carbon offer numerous sites for reduction and oxidation occurring to improve the charge storage for supercapacitors. Consequently, the synthesized Fe 5 Ni 4 S 8 /FeS@N-HPC electrode exhibits excellent electrochemical properties. The optimized Fe 5 Ni 4 S 8 /FeS@N-HPC composite fabricated under 800 °C displays an excellent capacitance of 2812.4 F g −1 (734.56 C g −1 ) at a current density of 0.5 A g −1 . Beside, the Fe 5 Ni 4 S 8 /FeS@N-HPC-800//active carbon asymmetric supercapacitor shows an energy density of 76.8 W h kg −1 at a power density of 395.03 W kg −1 and superior cycling stability of 93.24% over 10,000 charge-discharge cycles. Our work presents a novel approach to the construction of high-performance electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 71
·19032-19037
·
IF 5.16
Pengkun Wei,Xuemin Li,Jing Li,Jinwu Bai,Chuanjia Jiang,Lu Liu
Graphical Caught the sun : For the first time, ternary nickel iron sulfide nanospheres have been successfully fabricated through a two-step solvothermal approach with the help of glucose (See Figure). Subsequently, the electrochemical performance and electrocatalytic activity of Ni 0.5 Fe 0.5 S 2 /C were evaluated for application in dye-sensitized solar cells The incorporation of a foreign metal into a material may adjust the surface electronic structure and promote charge transfer, which then ultimately improves electrical conductivity and electrocatalytic performance because of the possible charge delocalization between the metal cations. As a result, for the first time, ternary nickel iron sulfide nanospheres have been successfully fabricated through a two-step solvothermal approach with the help of glucose (Ni 0.5 Fe 0.5 S 2 /C). Subsequently, the electrochemical performance and electrocatalytic activity of Ni 0.5 Fe 0.5 S 2 /C were evaluated by electrochemical impedance spectroscopy, Tafel polarization and cyclic voltammetry, indicating high electrical conductivity and great electrocatalytic activity. Ni 0.5 Fe 0.5 S 2 /C was employed as a counter electrode for dye-sensitized solar cells, and exhibited higher power conversion efficiency (6.79 %) than the device with Pt CE (6.31 %) under full sunlight illumination (100 mW cm −2 , AM 1.5G).
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）