Journal of Materials Chemistry A
·
2025
·
IF 9.5
Chenyang Duan,Hao Zhang,Zhiwei Hu,Zhenya Li,Wenjie Bian,Chao Jing,Jian-Qiang Wang,Linjuan Zhang
Modulating the configurational entropy of materials is an effective strategy to develop efficient and robust electrocatalysts for the oxygen evolution reaction (OER) in clean energy technologies. However, the impact of configurational entropy on catalytic activity has received limited attention. In this study, we systematically investigate a class of alloy catalysts composed of Cr, Mn, Fe, Co, and Ni, as a function of Ni content to modulate the configurational entropy to 1.50R (high-entropy alloy, Ni-HEA), 1.23R (medium-entropy alloy, Ni-MEA), and 0.66R (low-entropy alloy, Ni-LEA), where R is 8.314 J (mol−1 K−1). In situ Raman spectroscopy reveals that increased configurational entropy facilitates the formation of the OER active γ-NiOOH phase on the alloy surface. This transition leads to a significant decrease in the OER overpotentials and Tafel slopes. The optimized Ni-HEA exhibits an overpotential of only 217 mV at 10 mA cm−2, and demonstrates prolonged operational stability for 600 hours under industrial conditions. This work enhances our understanding of the impact of configurational entropy on catalytic activity and offers a novel approach for the rational design of porous high-entropy catalysts with improved OER efficiency.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenyan Huang,Jiahao Hu,Yeqi Zhu,Jiahua Zhan,Rongdan Lei,Yuchen Sun,Kaiqi Chen,Siqi Lan,Rongqian Yao
As contemporary aerospace and radar-detecting technologies evolve, load bearing-microwave absorption integration of thermal protection materials for complex environment requirements are urgent. Well known for low density, good high-temperature resistance and superior tunable dielectric properties, polymer-derived ceramics (PDCs) promisingly meet most needs of high-performance aircraft thermal protection system (TPS). Aimed at promoting practical application, we integrate in-situ formed Ni 2 Si into lightweight SiC(rGO) nanocomposite PDCs via re-pyrolyzing coassembled nano-Ni/SiC(rGO) p /polycarbosilane-vinyltriethoxysilane-graphene oxide (PVG) blends to enhance their mechanical and electromagnetic wave (EMW) absorbing performances. Size effect on phase transition of Ni into Ni 2 Si (as brazing bonding agents) accompanied by volumetric expansion, ingeniously eliminates stretching stress from PVG precursor inward shrinkage for compact framework during re-pyrolysis. In-situ generated Ni/Ni 2 Si/C core-shell nanostructure (similar to nodular cast iron) has good chemical compatibility with β-SiC/SiO x C y /C free (rGO), thereby enables composites improved compactness and toughness. More interestingly, heterogeneous interfaces/defects among Ni, Ni 2 Si, carbon shell, β-SiC and SiO x C y /C free (rGO) matrix, effectively facilitate interfacial/dipole polarization for robust EMW absorption, and lightweight SiC(rGO, Ni 2 Si) Ni=4% nanocomposite PDCs exhibit outstanding fracture toughness of 6.56 MPa·m 1/2 and high compressive strength of 119.25 MPa. Such composite with structure-function integration maintain stable under butane blowtorch at ∼1300 °C, shedding light on a new route to mass-manufacture aerospace vehicle components.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yanqing Cong,Qiuang Zheng,Xiaoran Wang,Xinyue Li,Qiuyu Zheng,Shi-Wen Lv
It is of great significance for a clean energy system to develop novel non-noble catalysts toward the alkaline hydrogen evolution reaction (HER). Herein, CQDs-doped Ni(OH) 2 nanosheets generated on nickel foam were fabricated by a feasible method using Ni-MOF as precursor. Notably, the alkali etching treatment can open the spatial structure of Ni(OH) 2 and expose more active sites, thereby improving the electrocatalytic active surface area . Meanwhile, introduced CQDs can be acted as the charge carrier and accelerate the charge transfer. As a result, the Ni(OH) 2 -CQDs nanosheets showed excellent electrocatalytic performance in HER under alkaline condition, and an overpotential of 101 mV for OER over Ni(OH) 2 -CQDs/NF electrode can be realized at a current density of 10 mA/cm 2 . More significantly, embedding CQDs can effectively boost the photocatalytic activity of Ni(OH) 2 . Thus, light radiation can enhance the performance of Ni(OH) 2 -CQDs/NF electrode in HER, and the overpotential of Ni(OH) 2 -CQDs/NF electrode for HER can reduce to 90 mV under light irradiation . Furthermore, the Ni(OH) 2 -CQDs/NF electrode displayed great HER stability, and the possible mechanism of photo-assisted electrochemical HER was also proposed. All in all, current work will share some valuable insights into preparation and application of catalysts in HER.
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Journal of Energy Storage
·
2024
·
IF 8.9
Chongjun Zhao,Haimin Ou,Chunhua Zhao
Energy storage devices serve critical roles in both harvesting energy from new energy sources and supplying energy to consumers, and the performance of supercapacitors is heavily reliant on the performance of activated material, which is determined by the qualities achieved during the specified preparation process. Herein, due to the merit of isotropy of 0D carbon nanoparticles in structure and current transfer, spherical carbon aerogels (CA) with the size of ϕ ~ 100 nm are carbonized within 3 min in air in an open tube furnace, in which those waste epoxy resin blocks are chosen and reused as the carbon source. After the activation, the surface of activated CA (ACA) becomes rough, and its specific surface area reaches 1222.40 m 2 ·g −1 . The above ACA owns high electrochemical supercapacitor performance: Referring to the ACA-based electrode, a specific capacitance of 298.8 F·g −1 at 1 A·g −1 and 92.81 % retention after 20,000 cycles of repeated charge/discharge. As for its symmetric supercapacitor (SSC), it has good CV behavior even at 1000 mV·s −1 , accompanied by an energy density of 20.92 W h·kg −1 at the power density of 300 W·kg −1 , and 12.34 W h·kg −1 even at 12000 W·kg −1 .
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ACS Applied Materials & Interfaces
·
2025
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IF 8.2
Mingchen Xu,Xinfa Zhu,Gaoning Fan,Xiyu Jia,Yonghui Zhang,Mengjun Wang,Hongxing Zheng,Pengyu Zhou,Chao Fan
Visible photodetectors based on two-dimensional tin disulfide (SnS2) have attracted interest for applications in optical communication, information capture, and military reconnaissance owing to their high absorption efficiency, atomic-scale thickness, and nontoxicity. However, their intrinsic bandgap limits their spectral detection range, hindering further practical applications. Herein, we introduce VIII B-nickel (Ni) with a similar ionic radius to Sn to form Ni-doped SnS2 few-layers via micromechanical exfoliation. As the Ni-doping concentration increases, the bandgap decreases from 2.14 (SnS2) to 1.95 eV (Sn0.9Ni0.1S2). Subsequently, Ni-doped SnS2-based photodetectors are fabricated and characterized. These devices exhibit an extended spectral detection range and excellent performance, with a maximum responsivity of 2009 A W–1 and high normalized detectivity of 2.47 × 1012 cm Hz1/2 W–1. Furthermore, to suppress dark current and noise, SnS2/Ni-doped SnS2 homostructures and their corresponding photodetectors are fabricated. The built-in electrical field of the homostructure effectively reduces the dark current of the homostructure photodetector to 110 nA. Consequently, the responsivity is enhanced to 3350 A W–1 and the response time is reduced to 3.5 ms, outperforming most other 2D material–based and commercial photodetectors. And Ni-SnS2 VPDs show an application potential in imaging and visible-light communication systems. Thus, this study presents an effective approach to extend the detection spectrum of SnS2-based photodetectors and pave the way for their future applications.
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PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2092
·
IF 4.2
Zhi Lu,Shilin Li,Laiyuan Ning,Kun Tang,Yifan Guo,Long You,Chong Chen,Guangxin Wang
Developing high-performance and cost-competitive electrocatalysts have great significance for the massive commercial production of water-splitting hydrogen. Ni-based electrocatalysts display tremendous potential for electrocatalytic water splitting. Herein, we synthesize a novel NiFe-layered double hydroxide (LDH) electrocatalyst in nanosheets array on high-purity Ni foam. By adjusting the Ni/Fe ratio, the microstructure, and even the behavior of the electrocatalyst in the oxygen evolution reaction (OER), changes significantly. The as-obtained material shows a small overpotential of 223 mV at 10 mAcm−2as well as a low Tafel slope of 48.9 mV·dec−1in the 1 M KOH electrolyte. In addition, it can deliver good stability for at least 24 h of continuous working at 10 mAcm−2. This work proposes a strategy for engineering catalysts and provides a method for the development of other Ni-based catalysts with excellent performance.
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PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3966
·
IF 4.2
Zhi Lu,Shilin Li,Yuxin Wang,Jiefeng Wang,Yifan Guo,Jiaqi Ding,Kun Tang,Yingzi Ren,Long You,Hongbo Meng,Guangxin Wang
Water splitting is an important approach to hydrogen production. But the efficiency of the process is always controlled by the oxygen evolution reaction process. In this study, a three-dimensional nickel–molybdenum binary nanoarray microstructure electrocatalyst is successfully synthesized. It is grown uniformly on Ni foam using a hydrothermal method. Attributed to their unique nanostructure and controllable nature, the Ni-Mo-based nanoarray samples show superior reactivity and durability in oxygen evolution reactions. The series of Ni-Mo-based electrocatalysts presents a competitive overpotential of 296 mV at 10 mA·cm−2for an OER in 1.0 M KOH, corresponding with a low Tafel slope of 121 mV dec−1. The three-dimensional nanostructure has a large double-layer capacitance and plenty of channels for ion transfer, which demonstrates more active sites and improved charge transmission. This study provides a valuable reference for the development of non-precious catalysts for water splitting.
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Small
·
2024
·
IF 13
Zhipeng Liu,Jinling Xue,Yibin Fan,Yinshi Li
Rational design of efficient and non-noble metal bifunctional catalysts for alkaline overall water splitting (OWS) electrochemical reactions is of top priority in the development of hydrogen-based energy. Constructing catalysts with unique structures to optimize the intrinsic activity is a promising strategy. In this work, a newly developed Ni 3 Co 3 Mo 100 -BTC-15h catalyst consisting of Ni nanoparticles enriched on the surface along with a core-shell porous structure is prepared via a hydrothermal process. Due to the unique composition and Ni-enriched core–shell structure, the Ni 3 Co 3 Mo 100 -BTC-15h catalyst exhibits enhanced electrocatalytic properties for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. Under the dual tuning and intermetallic phase, the Ni 3 Co 3 Mo 100 -BTC-15h catalyst deliver a lower overpotential of 151 mV and ≈ 136 mV exceeding commercial catalysts for OER and HER. When the Ni 3 Co 3 Mo 100 -BTC-15h is used as bifunctional catalyst for OWS in a two-electrode alkaline electrolyzer, a cell voltage of 1.62 V is required to drive 10 mA·cm −2 comparable to that of commercial Pt/C and RuO 2 catalysts. This work proposes a potential strategy for optimizing the electrocatalytic performance of non-noble metal catalysts for OWS.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Bohao Kong,Hefeng Yuan,Zhehao Liu,Zizai Ma,Xiaoguang Wang
Engineering platinum-free catalysts for hydrogen evolution reaction (HER) with high activity and stability is essential for electrochemical hydrogen production . In this paper, we report the synthesis of cobalt-doped AlNi 3 /NiO (Co-AlNi 3 /NiO) electrode with three-dimensional nanoporous structure via chemical dealloying method. Density functional theory (DFT) calculations reveal that Co-AlNi 3 /NiO can accelerate water adsorption / dissociation and optimize adsorption–desorption energies of H* intermediates, thus improving the intrinsic HER activity. Both the introduction of Co and Al can efficiently ameliorate the electronic density around Ni sites of NiO and AlNi 3 , which can effectively reduce the energy barrier towards Volmer–Heyrovsky reaction and thus synergistically promote the hydrogen evolution. Benefiting from the large electrochemical active surface area , high electrical conductivity and electronic effect, the nanoporous Co-AlNi 3 /NiO catalyst exhibits remarkable HER activity with an overpotential of 73 mV at a current density of 10 mA cm −2 in alkaline condition, outperforming most of the reported non-precious metal catalysts . The nanoporous Co-AlNi 3 /NiO catalyst can operate continuously over 1000 h at high current densities with a robust stability. This work provides a new vision for the development of low-cost and efficient electrocatalysts for energy conversion applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xiaoqin Wang,Qiaoqin Li,Yong Zhang,Yufei Yang,Zhi Cao,Shanxin Xiong
A novel synthesis approach of N-doped porous carbon (NPC)/NiO composites possessing some honeycomb-shaped nanoporous carbon and plentiful NiO nanosheets is exploited. First NPC/Ni composites are achieved with NPC yield of 52.9% through a catalytic pyrolysis method, using coal-based polyaniline particles prepared by an in-situ polymerization method as a carbon and nitrogen source, and nickel particles as a catalyst, respectively. Next NPC/NiO composites are achieved unexpectedly with plentiful NiO nanosheets and N content of 1.00 wt% after a liquid oxidation process. In NPC/NiO composites, porous carbon mainly presents in the amorphous state, while the incorporated nitrogen mainly presents in the form of pyrrolic N (92.9 at.%) and oxidized N (7.1 at.%). Plentiful NiO nanosheets are embedded in the pores or on the NPC surface. 33.3 at.% Ni 2 O 3 components exist in the surface of NiO nanosheets. NPC/NiO composites possess not only rich micropores, but also significant mesopores and nanoscale macropores. The BET specific surface area, BET average pore width and BJH adsorption average pore diameter are 627.5 m 2 /g, 2.0 nm and 5.1 nm, respectively. NPC/NiO composites demonstrate a high specific capacitance of 404.1 F/g at 1 A/g, and a good cycling stability maintaining high specific capacitance of 212.4 F/g (84.3% of the initial capacitance) at 5 A/g after 5000 cycles of charge and discharge, attributed to some honeycomb-shaped nanopores of carbon and large specific surface area of NiO nanosheets, and the synergistic effects between electric double-layer capacitance of NPC and pseudocapacitance of NiO. This study may provide a novel approach for the value-added applications of low-rank coal.
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JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 47
·期 6
·3248-3253
·
IF 1.579
Chen Jun-Liang,Liu Chengyan,Miao Lei,Gao Jie,Zheng Yan-yan,Wang Xiaoyang,Lu Jiacai,Shu Mingzheng
With excellent high-temperature stability (up to 1000 K) and favorable electrical properties for thermoelectric application, TiNiSn-based half-Heusler (HH) alloys are expected to be promising thermoelectric materials for the recovery of waste heat in the temperature ranging from 700 K to 900 K. However, their thermal conductivity is always relatively high (5–10 W/mK), making it difficult to further enhance their thermoelectric figure-of-merit ( ZT ). In the past decade, introducing nano-scale secondary phases into the HH alloy matrix has been proven to be feasible for optimizing the thermoelectric performance of TiNiSn. In this study, a series of TiNiSn-based alloys have been successfully synthesized by a simple solid-state reaction. The content and composition of the heterogeneous phase (TiNi 2 Sn and Sn) is accurately regulated and, as a result, the thermal conductivity successfully reduced from 4.9 W m −1 K −1 to 3.0 Wm −1 K −1 (750 K) due to multi-scale phonon scattering. Consequently, a ZT value of 0.49 is achieved at 750 K in our TiNiSn-based thermoelectric materials. Furthermore, the thermal stability of TiNiSn alloys is enhanced through reducing the Sn substance phase.
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NANO
·
2018
·
IF 1.1
Xiaojun Tao,Shuang Wang,Yanbao Zhao,Zhiwei Li
In this paper, a facile one-pot bottom-up approach for the preparation of graphene and Ni/graphene nanostructures at normal pressure and low temperature (150 ∘ C) has been developed. The graphene and Ni/graphene nanostructures were prepared by reducing hexachloro-benzene (C 6 Cl 6 ) with potassium in n -tetradecane (C 1 4 H 3 0 ) solution without the presence of a catalyst. Meanwhile, the effect of Ni content on the specific surface area (SSA) of the final products was investigated. The testing results display that the as-prepared samples have large SSA and high C/O ratio, implying that the designed synthesis method is simple and efficient. To evaluate the adsorption performances of the samples, we select organic dye rhodamine B (RhB) as the model organic contaminant in aqueous solutions. The experimental results show that the samples possess high adsorption capacity ( q max mg g − 1 ) , ultrafast adsorption rate ( > 9 9 %, 2 min), high adsorption efficiency ( ≥ 9 9 . 8 %) and good chemical stability in a wide pH range (2–11), high salt tolerance ( > 8 0 mg mL − 1 ) , and good reusability ( > 9 9 . 5 %, 9 cycles) for dye RhB from water. In particular, the samples exhibit a good property for the treatment of the raw industrial wastewater (RIW).
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