RSC Advances
·
2025
·Vol. 15
·期 7
·5305-5315
·
IF 4.6
Zhaojun Tan,Shuaihui Guo,Wen Wang,Gang Li,Zhenwei Yan
Precise catalyst design is essential in the electrolysis of water to deliver clean energy, where the challenge is to construct highly active sites at the electrocatalyst interface. In this study, CoPVP/NFF (NiFe foam) and Mo–CoPVP/NFF precursors were synthesized sequentially in a hydrothermal procedure using NiFe foam as substrate with the ultimate formation of a NiFeCoMoS/NFF electrocatalyst by vulcanization at 350°. The NiFeCoMoS/NFF system exhibits a complex 1D–2D–3D composite structure with 1D nanoparticles attached to a 2D nano-paper on the surface of the 3D NiFe foam. The overpotentials associated with hydrogen and oxygen evolution by NiFeCoMoS/NFF are 123 mV and 245 mV, respectively, at a current density of 10 mA cm−2. A three-electrode system using NiFeCoMoS/NFF as working and counter electrode has been assembled that can generate current densities of 100 mA cm−2 at voltages of 1.87 V. Theoretical (DFT) calculations have shown that NiFeCoMoS/NFF exhibits favorable H adsorption energetics and a low OER reaction barrier. This study has identified a viable means of enhancing the efficiency of water electrolysis by regulating catalyst surface structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yanyan Wu,Ying Li,Mengke Yuan,Zhe Lü,Lingling Xu,Bo Wei
Developing efficient and nonprecious electrocatalysts for oxygen evolution reaction (OER) is crucial for the hydrogen generation via water splitting. Here we report the direct growth of heterostructural Ni 2 P–Fe 2 P hybrid electrocatalysts on NiFe foams. The redox engineered NiFe foam (rNF) significantly enhances the OER performance. Among prepared catalysts, Ni 2 P–Fe 2 P/rNF performs the highest OER activity, driving the current densities of 10 and 100 mA cm −2 at low overpotentials of 218 and 270 mV in 1 M KOH, respectively. Meanwhile, it can maintain 100 mA cm −2 for 24 h without obvious degradation. The morphology and composition of NFP/rNF after OER test were carefully studied. This work suggests that self-supported bimetal phosphides of NFP/rNF is an efficient and durable electrode material for water oxidation .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 5
·1423-1436
·
IF 2.392
Liu Jun-ru,Li Zhi-bo,Chen Ben,Chou Kuo-chih,Zhang Guo-hua
In order to improve the low ductility of the Mo-Ni alloy, Fe is added and the effects of Ni/Fe mass ratio on the densification behavior, microstructure evolution and mechanical properties of alloy were investigated. The experimental results show that when iron is added to 95Mo-5Ni alloy, the formation of brittle intermetallic phase δ -MoNi at the grain boundary is avoided. Meanwhile, the grain growth of Mo is also effectively inhibited in the sintering process. However, the addition of iron reduces the degree of densification of alloy since the activation effect of Ni is superior to that of Fe. From the experimental results, it could be concluded that the maximum hardness and bending strength are achieved by 95Mo-1.5Ni-3.5Fe alloy, which are HV 614 and 741 MPa, respectively. Combined with the analyses of bending fracture mechanism, the improvement relative to Mo-Ni alloy is likely attributed to the inhibition of the brittle phase.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
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
·
材料科学
·
催化作用
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 8
·1347
·
IF 5.719
Wen Jiang,Lingling Dong,Shuanghui Liu,Shuangshuang Zhao,Kairu Han,Weimin Zhang,Kefeng Pan,Lipeng Zhang
Lithium-sulfur batteries exhibit great potential as one of the most promising energy storage devices due to their high theoretical energy density and specific capacity. However, the shuttle effect of the soluble polysulfide intermediates could lead to a severe self-discharge effect that hinders the development of lithium-sulfur batteries. In this paper, a battery separator has been prepared based on NiFe2O4/Ketjen Black (KB) modification by a simple method to solve the shuttle effect and improve the battery performance. The as-modified separator with the combination of small-size KB and NiFe2O4nanoparticles can effectively use the physical and chemical double-layer adsorption to prevent polysulfide from the shuttle. Moreover, it can give full play to its catalytic effect to improve the conversion efficiency of polysulfide and activate the dead sulfur. The results show that the NiFe2O4/KB-modified separator battery still maintains a discharge capacity of 406.27 mAh/g after 1000 stable cycles at a high current density of 1 C. Furthermore, the coulombic efficiency remains at 99%, and the average capacity attenuation per cycle is only 0.051%. This simple and effective method can significantly improve the application capacity of lithium-sulfur batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Luya Shen,Haoyang Li,Xi Yang,Shaoyuan Li,Yuelong Yu,Jijun Lu,Fengshuo Xi,Wenhui Ma,Rong Deng
The environmentally friendly recycling of end-of-life (EoL) photovoltaic modules is a crucial pathway to achieving “carbon neutrality.” However, currently, most efforts are primarily focused on the recovery of valuable metals, neglecting the utilization of TPT (Tedlar/PET/Tedlar) plastic backsheet. This work develops a two-stage pyrolysis process for TPT decomposition and which can convert into high-value nanocarbon materials and hydrogen under the catalysis of Ni and Fe nanometal particles. The pyrolysis behavior of TPT backplates was systematically investigated, the gas chromatography results reveal that the pyrolysis products primarily consisted of CO 2 , CO, CH 4 , CH 3 CHO, and other small molecules, alongside sizeable residual compounds under the catalytic degradation process. The resulting hydrocarbons play an important role as carbon sources in the formation of carbon nanomaterials and hydrogen generation. The study thoroughly discusses the effects of different catalyst on pyrolysis gas species and components, fixed carbon content, and nanocarbon morphology. Molecular dynamics simulations based on the reactive force field (ReaxFF) was performed to analyze the pyrolysis products. Finally, a gas–liquid-solid physical model was proposed to interpret the growth process of the carbon nanomaterials under Ni-Fe nanometallic catalysis.
研究领域:
环境科学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yaqin Rong,Shuai Li,Junjian Niu,Zhongde Wang,Xiaogang Hao,Chengwen Song,Tonghua Wang,Guoqing Guan
Radioactive cesium ( 137 Cs) ions exhibit high-energy gamma radiation and long half-life. When they enter water body, serious environmental problems and damage to the human body are always generated. Herein, an electroactive composite membrane was facilely prepared by uniformly deposition of nickel hexacyanoferrate (NiHCF) nanoparticles on the surface and inner wall of coal-based tubular carbon membrane (CTCM) for rapid and selective separation of Cs + from wastewater. This NiHCF incorporated CTCM tube exhibited an extremely high removal rate (over 99.99%) over a long period. Meanwhile, it also demonstrated extreme Cs + selectivities even in the solutions with high coexisting ion concentrations (e.g., Cs + :Na + = 1:99, Cs + :K + = 1:99). The rapid and selective Cs + uptake/release should be attributed to the better dispersion of NiHCF nanoparticles with high selectivity to Cs + in the CTCM tube, which reduced the mass transfer distance, increased fluid turbulence and accelerated mass transfer rate. It is expected that such a NiHCF incorporated CTCM tube could be a promising alternative of conventional materials for the separating of radioactive Cs + ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 23
·8442-8448
·
IF 4.052
Ailing Yan,Hao Wan,Gen Chen,Ning Zhang,Wei Ma,Xiaohe Liu,Yijun Cao,Renzhi Ma
To realise the gradual replacement of noble metal-based materials for electrocatalytic energy conversion, numerous studies need to be focused on the compounds based on inexpensive 3d transition metals (such as Fe and Co). For achieving energetic electrocatalysis, elaborately designed nanostructures are urgently desired. Here, we reported a facile approach for the preparation of a NiFe oxide/phosphide (Ni2/3Fe1/3O/Ni4/3Fe2/3P) heterostructure with a 2-dimensional (2D) nanoflake-like morphology. Based on the combined advantages of composition and structure, the 2D Ni2/3Fe1/3O/Ni4/3Fe2/3P nanoflakes were characterized to exhibit a high activity for the electrocatalytic water oxidation, surpassing that of individual Ni2/3Fe1/3O or Ni4/3Fe2/3P nanoplates. This result may offer a great possibility of delicatedly designing nanostructures for highly efficient electrochemical energy conversion.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuang Gao,Zhenxing Wang,Yan Chen,Yimu Wang,Qiyuan Fu,Changhao Feng
The efficient and rapid detection of triethylamine (TEA) is crucial in the field of gas sensors. Sensors fabricated using doped ternary metal oxides demonstrate high response, good stability, excellent gas selectivity, and reproducibility. In this study, NiFe 2 O 4 nanofibers doped with different concentrations of Yttrium (Y/Ni = 0 at%, 1.5 at%, 2.5 at%, 3.5 at% and 4.5 at%) were synthesized via electrospinning, and gas sensors fabricated from these materials were systematically analyzed for their gas-sensing performances. The results indicated that the gas-sensing properties of Y-doped NiFe 2 O 4 nanofibers were improved. Gas sensors based on Yttrium-doped NiFe 2 O 4 nanofibers with a Y/Ni ratio of 2.5 % (referred to as 2.5 % Y-NFO) exhibited the best performance, exhibiting a gas response of 39.3 for the detection of triethylamine at a concentration of 100 ppm at 125 °C. This response was about 3.1 times higher than pure NiFe 2 O 4 nanofibers. Additionally, the response time of 2.5 % Y-NFO is only 2 s, which is much faster than other reported TEA sensors. In addition, these gas sensors exhibit excellent repeatability, selectivity, and humidity resistance. Finally, the underlying mechanism responsible for the enhanced gas-sensing properties is comprehensively discussed. This study presents a simple, stable, and effective route for synthesizing Y-NiFe 2 O 4 nanofibers, thereby achieving excellent sensing performance for TEA detection.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Su Li,Jinkai Qiu,Zijun Bian,Bin Shao,Zhicheng Liu,Cheng Lian,Honglai Liu,Jun Hu
The dry reforming of carbonate with methane (CaDRM) can be one of the breakthrough technologies to address the challenge of mitigating inevitable CO 2 emissions into value-added chemicals but remains great challenges for efficient catalysts design. In this study, we break the trade-off between the catalytic activity and the carbon deposit by tailoring the d-band center of Ni through Fe doping, which matches the energy level of CH 4 * dehydrogenation but is far away from that of the over cleavage of CH* . In this light, the porous spherical Fe x Ni/Al 2 O 3 catalysts with Ni 3 Fe alloy nanoaggregates are obtained through a one-step spray drying method. The optimized Fe 0.6 Ni/Al 2 O 3 catalyst shows an excellent catalytic activity with a superior CO selectivity of 91.75 % at a complete CaCO 3 conversion at 700°C, and successfully prevents the carbon deposit to maintain its excellent stability. Moreover, the extremely low activation energy of 45.2 kJ/mol and the good porosity of Fe x Ni/Al 2 O 3 ensure its fast dynamics. Therefore, this tailoring d-band center approach through the formation of alloy catalysts supplied a novel strategy for effectively cracking hydrogen species while avoiding over cleavage of CH x * in the thermal catalysis, which promoted the CaDRM technology to be a promising solution for carbon neutrality in industrial sectors in near future.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Yang Peng,Xu Zhao,Yiqun Shao,Xin Yue,Zhuofeng Hu,Shaoming Huang
Spinel-type nickel ferrite (Ni x Fe 3-x O 4 , x≤1) is a widely used electrocatalyst for the oxygen evolution reaction (OER). Due to the lower hybridization of metal- d and oxygen- p orbitals, the OER process on Ni x Fe 3-x O 4 follows the sluggish adsorbate evolution mechanism (AEM). Generally, activating the lattice oxygen to trigger the lattice-oxygen-mediated mechanism (LOM) can enhance the OER activity. Herein, to trigger the LOM pathway while maintaining high stability, iron foam (IF)-supported Ni 0.75 Fe 2.25 O 4 (NiFeO) with geometrical defects of [NiO 6 ] (nickel cation coordinated with six oxygen anions) units and higher ratio of Fe to Ni cations in octahedral sites ( d -NiFe HR O/IF) is prepared by ion-exchanging with polar aprotic solvent followed by annealing. As a result, as-synthesized d -NiFe HR O/IF exhibits excellent activity (at 295 mV overpotential to achieve 100 mA cm −2 ), fast kinetics (Tafel slope of only 34.6 mV dec −1 ), and high stability (maintaining a current density of 100 mA cm −2 over 130 h) for the OER. The theoretical calculations reveal that the construction of octahedral defect in Ni x Fe 3-x O 4 enhances the overlap of Fe- d and O- p orbitals, which can activate the lattice oxygen. Therefore, increasing the ratio of Fe to Ni will further improve the lattice oxygen redox activity, and thus trigger the fast LOM pathway, ultimately facilitating the OER process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ran Qiao,Kai Zhang,Shuaichong Wei,Hongtao Bai,Zisheng Zhang,Jingde Li,Guihua Liu
Highly active and stable electrocatalysts are essential to facilitate the oxygen evolution reaction (OER) during alkaline water splitting. Herein, a titanium dioxide supported NiFe-based OER electrocatalyst (NiFe/TiO 2 ) was developed through simple impregnation reduction method. The introduction of TiO 2 support not only enhances the catalyst stability, but also induces the formation of NiFe alloy pre-catalyst layer on the oxide surface. In situ Raman revealed that the NiFe alloy was partially transformed into highly active NiOOH species in OER process. In situ infrared and theoretical calculations confirm the promoted formation of *OOH intermediate on NiFe/TiO 2 surface and thus accelerates the OER. The NiFe/TiO 2 catalyst achieves excellent OER activity delivering 10 mA cm −2 at low overpotential of 240 mV in 1.0 M KOH. The anion exchange membrane water electrolyzer with NiFe/TiO 2 achieves 500 mA cm −2 with cell voltage of 1.72 V, and good stability is maintained for 300 h. This study advances the effort of developing efficient and durable alkaline OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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