JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
Mohib Ullah Khan,Afaq Ullah Khan,Sameerah I. Al-Saeedi,Kamran Tahir,Abdulaziz A. Alanazi,Zainab M. Almarhoon,Talal M. Althagafi,Magdi E.A. Zaki,Hassan M.A. Hassan,Mingzai Wu
A binary composite of metal sulfides (MS) is directly synthesized on nickel foam through hydrothermal process, resulting in snow like nanosphere suitable for hybrid supercapacitors (HSCs). Herein, a ZnS/CdS binary composite has been grown directly on nickel foam using a simple hydrothermal method. The structural features, morphological characteristics and electrochemical performance of the composite are systematically investigated. Especially, the highest capacitance of 739–325 F/g at 1–10 A/g was attained with good rate performance. Moreover, a binder-less ZnS/CdS/NF composite achieved a high power of 5030 W/kg at 42 Wh/kg energy density by realizing an expanded voltage to 1.8 V with decent durability. Interestingly, a 92.84 % retention was noticed after 6500 cycles, which indicates high performance stability of the ZnS/CdS/NF||AC HSC. These outcomes reveal the promising prospect of all-metal sulfide utilization for next-generation energy storage devices.
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Water
·
2024
·Vol. 16
·期 22
·3235
·
IF 3
Qiao Xu,Fenfen Yan,Yujie Fan,Miao Gong
This work evaluated the alterations in the levels and types of polycyclic aromatic hydrocarbons (PAHs) within both liquid and solid products throughout the process of the catalytic supercritical water gasification of dewatered sewage sludge to examine the catalytic effect of various catalysts and the inhibit reaction pathways. The addition of Ni, NaOH, Na2CO3, H2O2, and KMnO4reduced the concentrations of PAHs, with Ni and H2O2showing the best performance. The concentrations of PAHs, especially higher-molecular-weight compounds in the residues, decreased sharply as the H2O2amount increased. At a 10 wt% H2O2addition, the levels of PAHs in the liquid and solid products were reduced by 91% and 88%, respectively. High-ring PAHs were not detected in the residues as the H2O2amount increased to an 8 wt%. H2O2addition evidently inhibits PAH formation by promoting the ring-opening reactions of initial aromatic compounds in raw sludge and inhibiting the polymerization of open-chain intermediate products. The addition of NaOH + H2O2or Ni + H2O2as combined catalysts significantly lowered PAH concentrations while increasing the H2yield. The addition of 5 wt% Ni + H2O2reduced PAH concentrations in the liquid and solid residues by 70% and 44%, respectively, while the H2yield escalated from 0.13 mol/kg OM to 3.88 mol/kg OM. Possible mechanisms associated with the reaction pathways of these combined catalysts are proposed.
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MOLECULES
·
2025
·Vol. 30
·期 1
·177
·
IF 4.6
Zhi Lu,Yifan Guo,Shilin Li,Jiaqi Ding,Yingzi Ren,Kun Tang,Jiefeng Wang,Chengxin Li,Zishuo Shi,Ziqi Sun,Hongbo Meng,Guangxin Wang
Water electrolysis is a promising path to the industrialization development of hydrogen energy. The exploitation of high-efficiency and inexpensive catalysts become important to the mass use of water decomposition. Ni-based nanomaterials have exhibited great potential for the catalysis of water splitting, which have attracted the attention of researchers around the world. Here, we prepared a novel Mo-doped NiFe-based layered double hydroxide (LDH) with a nanoarray microstructure on Ni foam. The doping amount of Mo can significantly change the microstructure of the electrocatalysis, which will further affect the oxygen evolution reaction (OER) performance of water splitting. This novel nanomaterial required only an overpotential of 227 mV for 10 mA cm−2and a Tafel slope of 54.8 mV/dec in 1 M KOH. Meanwhile, there was no Mo, and the NiFe-LDH needed 233 mV to attain to 10 mA cm−2. Compared to the NiFe-LDH without Mo, the NiFeMo-LDH nanosheet arrays exhibited enhanced activities with 17.1 mV/dec less Tafel in OER. The good performance of the electrocatalyst is ascribed to the special nanosheet arrays and the heterostructure of the Ni-Fe-Mo system. These features help to increase the active surface, enhancing the efficient charge transfer and the reactive activity in OER.
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高影响因子
Materials Today Physics
·
2024
·
IF 10
Yuping Duan,Meiqi Li,Yuan Guo,Ning Zhu,Huifang Pang,Chenxu Dou
High-entropy alloys, as a novel type of absorber, exhibit exceptional electromagnetic modulation capabilities and significant potential for electromagnetic wave absorption. In this work, the FeCoNiCrMn high-entropy alloy absorbent prepared through a mechanical alloying process demonstrates a dual-phase solid solution structure comprising face-centered cubic (FCC) and body-centered cubic (BCC) phases. By varying the manganese (Mn) content in the system, it is possible to enhance the degree of crystallinity, maintain the integrity of the crystal structure, and effectively control the relative proportion of the BCC phase within the overall phase composition. This adjustment improves the brittleness of the sheet-like particles, reduces particle size, and significantly lowers the permittivity. When the molar ratio of Mn is 0.6, the sample exhibits improved impedance matching due to the optimal permittivity and permeability. Notably, the impedance matching and attenuation constant can also be balanced. At 6.42 GHz, the FeCoNiCr 0.4 Mn 0.6 alloy powder achieves the maximum reflection loss of −48.49 dB at a matching layer thickness of 3 mm. When the matching thickness is reduced to 2 mm, it can effectively cover a frequency range of 8.7–14.1 GHz (effective absorption bandwidth of 5.4 GHz), along with a wide absorption bandwidth and high absorption efficiency.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiaxing Song,Jiabao lv,Yuhan Pan,Jingyu Wang,Jun Wang,Ang Cao,Angjian Wu,Paul T. Williams,Qunxing Huang
Conventional catalytic pyrolysis of waste plastics for H 2 production faces challenges due to excessively high reaction temperatures. This study introduced a NiCeOx/β catalyst for low-temperature H 2 production from polyethylene (PE), aiming to enhance H 2 yield through nonthermal plasma (NTP) and catalytic active sites. Experimental results confirmed the efficacy of NTP in promoting collision between high-potential-energies active species and plasma-catalyst interactions, identifying acidic sites as primary catalytic active sites. Both experiments and density functional theory (DFT) calculations confirmed NiO and CeO 2 particles as metallic active sites, exhibiting thermodynamic and kinetic benefits for primary products from PE pyrolysis. Under optimal conditions, the highest H 2 yield and selectivity respectively reached 32.71 mmol/g and 82.10 % at a PE/(NiCeOx/β) ratio of 1:4, reaction temperature of 400 °C, and NTP discharge power of 210 W. The NiCeOx/β catalyst facilitated low-temperature pyrolysis of waste plastics, enhancing H 2 selectivity and yield.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Mingchong Sui,Fangqing Wang,Caichi Liu,Qiuyan Hao,Ying Li,Hui Liu,Limin Liang
Cobalt–iron layered double hydroxide (CoFe LDH) is considered an advanced electrocatalyst toward the alkaline oxygen evolution reaction (OER), yet its poor stability is still a huge challenge. Here, based on an innovative spontaneous redox reaction (SRR) method, we synthesize a gold-nanoparticle-decorated CoFe LDH heterostructure on nickel foam (Au/CoFe LDH/NF) at room temperature. The heterostructure catalyst not only exhibits a low overpotential of 233 mV at 10 mA cm–2 but also displays 400 h stability without any degradation at ∼200 mA cm–2. The experimental and density functional theory (DFT) calculations validate that Au/CoFe LDH/NF with strong electronic coupling at the interface optimizes the electronic structure, reducing the OER energy barrier. In situ Raman spectra demonstrate that the transfer of electrons from Au nanoparticles to CoFe LDH alleviates the structural distortion of the catalyst during the OER, which is responsible for the strengthened stability.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Junyi Chen,Jing Wang,Dongsheng Lou,Yingying Xiang,Tongming Sun,Yanfeng Tang,Minmin Wang
FeOOH with excellent catalytic properties for oxygen evolution and also considered to be a true active site has attracted great interest in recent years. However, the intrinsic low conductivity limits its catalytic performance. Herein, a one-dimensional core-shell NiMoO4/FeOOH heterojunction with high OER activity and stability was developed. At current densities of 10 and 100 mA cm-2, low overpotentials of 194 and 266 mV are need to drive oxygen evolution, meanwhile, the electrode exhibits high catalytic kinetics with small Tafel slopes of 53.4 mV dec-1 and excellent stability over 100 hours. Further analysis showed that the ultrathin FeOOH layer (~5 nm) uniformly covered the surface of NiMoO4 nanorods, acting as an active species and facilitating the surface change transfer to the interior. The internal NiMoO4 cores, on the other hand, provides reliable electron transmission as a highly conductive medium, and can effectively overcome the low conductivity of FeOOH. DFT calculations further manifest the strong electronic interactions between NiMoO4 and FeOOH species. The NiMoO4 core serves as mass transport of active materials is beneficial to tune the adsorption energy of OH- on the surface of electrocatalysts.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Uddin Sk Raihan,Jingqi Zhang,Jingbo Chao,Qing Hu,Frederic Coulon,Xiao Jin Yang
Chlorinated phenols are highly toxic to human and ecosystem and their biological degradation is difficult. In this work, a novel MgAlNi alloy catalyst was developed for rapid chemical degradation of p-chlorophenol (4-CP) in water under mild conditions via in situ hydrodechlorination ( i HDC) without external hydrogen gas supply. A complete conversion of 0.195 mM 4-CP to phenol was achieved within 15 min with a reaction rate constant of 7.65 h −1 , 19.4 times higher than that of the traditional Raney Nickel (AlNi alloy) catalyst. The excellent performance of MgAlNi alloy catalyst is attributed to enhanced H 2 generation by Mg etching, surface self-reconstruction by growth of in situ layered double hydroxide ( i LDH) nanosheets of 0.08–1 nm, exposed active sites of AlNi intermetallic compounds Al 3 Ni 2 and Al 3 Ni. The findings of this study provide new insights into broader applications of nanoconfinement catalysis to environmental remediation and open a new domain of in situ nanoconfinement catalysis ( i NCC).
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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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