JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Wenwu Zhao,Xionghuan Yang,Ying Gu,Siqing Li,Yanqiang Hu,Yanfeng Tang,Minmin Wang
The development of highly efficient and stable electrocatalysts is crucial for the practical application of water splitting in renewable energy production. The Ni-Fe Phosphate electrocatalyst was synthesized through a simple and scalable electrodeposition method. This study presents a comprehensive investigation into the surface reconstruction engineering of an amorphous Ni-Fe phosphate electrocatalyst for enhancing its performance in alkaline water splitting. The reconstructed electrocatalyst exhibits significantly improved activity in alkaline water splitting. As expected, a low cell voltage of 1.86V was used to drive water splitting at 300 mA cm −2 , while the electrodes maintained high stability during 180 h continuous full water splitting at 70 mA cm −2 . This work provides insights into the mechanisms underlying the enhanced performance of the reconstructed Ni-Fe Phosphate based electrocatalyst and offers a promising approach for the design of advanced electrocatalysts for water splitting.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenxin Wang,Jiangjiang Zhang,Jinsheng Rong,Lanli Chen,Shiqiang Cui
Reducing the size of catalysts and tuning their electronic structure and interfacial properties are key to enhancing catalytic performance. Herein, a series of quantum-sized Co-based nanodot composites, including Co 3 O 4 /C, CoS 2 /C, CoN/C, and CoP/C, were synthesized using chemical vapor deposition (CVD) methods. By means of experimental measurement and theoretical calculation, CoP/C exhibited more robust electrochemical response than other Co-based compounds in electrochemical oxidation of N 2 H 4 (HzOR) and hydrogen evolution reaction (HER). The catalytic activities of CoP/C can be further enhanced by introducing Co vacancies on the surface of CoP/C (labeled as Co 1−x P/C). The results demonstrated that Co 1−x P/C not only exhibited notable electrochemical responses at an ultra-low N 2 H 4 concentration of 0.67 μM, showcasing its potential for ultra-sensitive N 2 H 4 detection but also realized HzOR instead of the oxygen evolution reaction (OER) half-reaction, thereby lowering the overpotential to 2.0 mV at 10.0 mA cm −2 . Finally, a Zn-hydrazine (Zn-Hz) battery was fabricated as a promising energy conversion device, showing the exceptional practical value of Co 1−x P/C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhuang Wang,Mian Li,Bin Fu,Wenping Cao,Xiangjie Bo
Although cobalt nitride (CoN)-based nanomaterials have been widely designed as advanced oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR) catalysts, the continuous consumption of lithium-ion batteries (LIBs) has led to a high price of cobalt metal. Therefore, in the future, recycling valuable Co elements from spent devices and boosting their service efficiency will inevitably promote the utilization of Co-based materials in water splitting and zinc-air batteries (ZABs). Herein, we realize the Co recycling from spent LIBs by a simple hydrometallurgy method. Under the assistance of hexamethylenetetramine and polystyrene spheres, after the hydrothermal and pyrolysis treatment in the NH 3 atmosphere, the as-reclaimed cobalt oxalates were successfully transformed into novel three-dimensional (3D) CoN nanoflowers (denoted as CoN NFs). Benefiting from the unique 3D flower-like architectures, intrinsic high conductivity, large surface area, uniformly dispersed CoN nanoparticles, and the synergistic effect between Co 3 N and CoO phases, the 3D flower-like CoN NFs exhibited excellent OER catalytic activity. The performance was much better than commercial RuO 2 in the 1.0 M KOH solution. Furthermore, the CoN NFs-based water splitting cell needed a voltage of 1.608 V to achieve the current density of 10 mA cm −2 , which is even 16 mV smaller than that of Pt/C||RuO 2 benchmark (1.624 V). Meanwhile, the CoN NFs-derived ZAB exhibited a high peak power density of 107.3 mW cm −2 (vs. 103.2 mW cm −2 of Pt/C-RuO 2 -based ZAB) and a low charge–discharge voltage gap (0.93 V vs. 1.43 V of Pt/C-RuO 2 -based ZAB). Due to the excellent structural and elemental stabilities, the corresponding water splitting cell and ZAB had outstanding durability. This work successfully explored an advanced industrial chain from recycling Co metal in spent devices to designing the high-efficiency HER/OER/ORR electrocatalysts for advanced water splitting devices and ZABs. This will further promote the value-added utilization of valuable Co metal in various energy storage or conversion devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shan Xu,Dongxu Jiao,Xiaowen Ruan,Zhaoyong Jin,Yu Qiu,Jinchang Fan,Lei Zhang,Weitao Zheng,Xiaoqiang Cui
Efficient production of green hydrogen energy is crucial in addressing the energy crisis and environmental concerns. The oxygen evolution reaction (OER) poses a challenge in conventional overall water electrolysis due to its slow thermodynamically process. Urea oxidation reaction (UOR) offers an alternative anodic oxidation method that is highly efficient and cost-effective, with favorable thermodynamics and sustainability. Recently, there has been limited research on bifunctional catalysts that exhibit excellent activity for both OER and UOR reactions. In this study, we developed a selenium and iron co-doped nickel sulfide (SeFe-Ni 3 S 2 ) catalyst that demonstrated excellent Tafel slopes of 53.9 mV dec −1 and 16.4 mV dec −1 for OER and UOR, respectively. Density Functional Theory (DFT) calculations revealed that the introduction of metal (iron) and nonmetallic elements (selenium) was found to coordinate the d-band center, resulting in improved adsorption/desorption energies of the catalysts and reduced the overpotentials and limiting potentials for OER and UOR, respectively. This activity enhancement can be attributed to the altered electronic coordination structure after the introduction of selenium (Se) and iron (Fe), leading to an increase in the intrinsic activity of the catalyst. This work offers a new strategy for bifunctional catalysts for OER and UOR, presenting new possibilities for the future development of hydrogen production and novel energy conversion technologies. It contributes towards the urgent search for technologies that efficiently produce green hydrogen energy, providing potential solutions to mitigate the energy crisis and protect the environment.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 39
·16015-16024
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IF 5.7
Jiawen Hu,Linwen Jiang,Hang Liu,Jiawei Jin,Lei Jia,Anhua Wu,Xiaofeng Zhang
Further enhancing the effective absorption bandwidth (EAB) and the harsh-environment stability of high-entropy alloy (HEA) electromagnetic-wave absorbing (EMA) materials is of great practical significance and broad application prospects. A new type of sulfur (S)-dissolved HEA EMA material was developed in this work. The flaky FeCoNiCuSx (x = 0, 0.05, 0.10, 0.20) HEAs were successfully prepared by a mechanochemical process. The phase structure, magnetic properties, corrosion resistance, oxidation resistance and EMA performances of the FeCoNiCuSx HEAs were investigated in detail and it was found that the introduction of S significantly optimized the impedance matching and achieved excellent EMA performances. The results showed that S10 (FeCoNiCuS0.10) had a minimum reflection loss (RL) of −65.20 dB and a wide EAB of 6.89 GHz. And the S20 (FeCoNiCuS0.20) achieved an ultra-wide EAB of 7.00 GHz and an RL of −55.40 dB in the C-band. In addition, the FeCoNiCuSx HEAs also exhibited excellent corrosion resistance. This work not only demonstrated the potential application of S-dissolved HEAs in the EMA field in harsh environments, but also provided new ideas for optimizing the electromagnetic impedance matching of HEAs.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Yuqiao Zhao,Geyuan Jiang,Suqing Zeng,Lisha Sun,Haipeng Yu,Dawei Zhao
Ultrathin devices represent a significant advancement in materials science and technology, playing a crucial role in wearable electronics, smart healthcare, and human-computer interaction. However, achieving mechanical durability, interface stability, and performance trade-offs remains challenging. Herein, the study reports a scalable layer-by-layer exfoliation strategy for the rapid and patterned fabrication of ultrathin cellulose ionogel devices, employing a solvent-induced assembly of cellulose molecules and active substances. The resulting freestanding devices, with a thickness of 12.46 µm—approximately one-ninth the thickness of human hair, exhibited desirable mechanical tensile strength (6.5 MPa), high pressure sensitivity (75.82 kPa −1 ), low impedance characteristics (5.83 Ω at 1 kHz), and outstanding interfacial stability, as evidenced by the ability to endure 500 cycles of tape stripping. Furthermore, due to effective self-healing and controllable induced peeling characteristics, the study is able to conduct the patterned fabrication of various ultrathin devices without the limitation of active materials. This peeling strategy based on sustainable resources offers a valuable solution for designing and optimizing ultrathin electronic devices without requiring substantial time or cumbersome processing.
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CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Siyuan Yin,Song Li,Muying Sun,Zhongsheng Wen,Juncai Sun
Transition metal oxides (TMOs) are promising high-capacity anodes for Li-ion batteries, but their low initial Coulombic efficiency (ICE) hinders practical application. Here, a Ni/Mn 3 O 4 composite was prepared via ball milling, where nano-Ni dispersion enhanced phase transition, increasing ICE from 39.7 % to 57.8 %. Nano-Ni reduced charge transfer resistance and enhanced pseudocapacitance contribution, improving kinetics. DFT calculations revealed Ni’s catalytic role in lowering the Li O bond-breaking energy barrier and suppressing irreversible phase transitions. TEM confirmed Ni-promoted Mn 3 O 4 phase transformation and accelerated early-stage reaction kinetics. This study provides a strategy for designing conversion-type anodes with high ICE and kinetics.
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DIAMOND AND RELATED MATERIALS
·
2025
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IF 5.1
Jiangyu Wu,Jianghua Wu,Yuwen Xue,Yunwu Zheng,Jingyan Liu,Xu Lin,Fulin Yang,Yuan Zou,Can Liu
This study develops an environmentally friendly method to create S/P dual-doped porous carbon (WSC-SP-800) from walnut shells for supercapacitor electrodes. Compared with the raw carbon materials, WSC-SP-800 exhibits higher specific surface area, richer microporous and mesoporous structures, as well as superior electrochemical performance. The specific surface area rises from 1533.40 m 2 g −1 to 3061.96 m 2 g −1 , and the capacitance increases from 156 F g −1 to 417 F g −1 at a current density of 0.5 A g −1 . Additionally, WSC-SP-800 maintains a capacitance of 270 F g −1 even at a high current density of 10 A g −1 . When assembled into a symmetric supercapacitor, it achieves an energy density of 13.15 Wh kg −1 at a power density of 250 W kg −1 and retains 100 % of its capacity after 5000 cycles. This work not only achieves cost-effective, high-performance energy storage with environmentally benign characteristics but also establishes a novel paradigm for the valorization of biowaste through heteroatom engineering, providing a sustainable pathway for supercapacitor development.
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APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Zhaoxiang Qi,Yan Zhang,Junzi Huang,Wenjun Zhang,Ying Wang,Ying Qi,Shu Yin,Hongyu Mi,Yahong Xie
The integration of environmental remediation with green hydrogen production bifunctional water electrolysis in hypersaline industrial effluents requires catalysts that simultaneously address efficiency-stability trade-offs. This study presents a self-supported P-SnCoFe-LDH/NF architecture engineered through dual-ion co-doping, demonstrating unprecedented performance in chloride-rich alkaline oilfield wastewater. The optimised catalyst achieves overpotentials of 253 mV for oxygen evolution reaction (OER) and 187 mV for hydrogen evolution reaction (HER) at 10 mA cm −2 with 12-h stability, representing a 4 and 41 % performance retention improvement over conventional CoFe-LDH in aggressive media. Mechanistic studies reveal dual electronic modulation: Sn-doping induces d-band center downshifting while P-incorporation generates electron-deficient metal centers. This synergy establishes optimal adsorption–desorption equilibrium, evidenced by 21 % reduced OER charge transfer resistance and 56 % enhanced HER Volmer kinetics. The symmetric electrolyser (P-SnCoFe-LDH/NF||P-SnCoFe-LDH/NF) maintains <2 % voltage decay during continuous operation. This work presents a new paradigm for multifunctional electrocatalysis in complex aqueous matrices.
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INTERMETALLICS
·
2025
·
IF 4.8
Liangcai Du,Xiaoqing Liu,Qianqian Kong,Lichao Gong,Zhenhua Yao
Understanding the intricate phase transformations and their impact on the mechanical properties holds paramount importance in developing high entropy alloys (HEAs) with ideal properties, yet it remains challenging and underexplored. In this study, a series of novel CrFeMnNi (2-x) Ti x (x = 0, 0.5, 1, and 1.5 at.%) HEAs were meticulously designed based on the established Valence Electron Concentration (VEC) rule, with the VEC values systematically varied as the atomic composition (Ni, Ti) changed. The microstructure, phase transformation behavior, mechanical properties, and strengthening mechanisms were systematically investigated. We found that the HEA powders exhibited phase behavior consistent with the VEC rules. The spark plasma sintered (SPSed) HEA bulk samples exhibited a phase transformation attributed to the precipitation of Cr and Mn within the matrix, resulting in the formation of the σ phase. Quantitative calculation of the strengthening mechanisms revealed that grain boundary strengthening and precipitation strengthening were the primary contributors to the high strength of the HEA bulk samples. These findings not only advance the utilization of the VEC rules in HEA material design but also contribute to the understanding of the phase behavior and mechanical properties of HEAs, facilitating the design of high performance HEAs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiawei Li,Yunpeng Wang,Changzhou Chen,Xinyu Cao,Liancen Li,Yihao Xu,Ruyu Zhang,Jinli Chen,Minsheng Lu,Douyong Min,Guangfu Qian
To address the intrinsic activity and stability limitations of nickel-based heterojunction catalysts in the urea oxidation process (UOR) and the hydrogen evolution reaction (HER) under strongly alkaline conditions, a sulfur-doped lignin-derived carbon-encapsulated NiCo@MoO 2 heterostructure (NiCo@MoO 2 /SC) as a bifunctional catalyst is engineered. The physical properties, electrochemical characterization, and simulation results demonstrate that the built-in electric field at the triphasic interface synergistically optimizes the electronic structure of NiCo@MoO 2 /SC, enhancing the UOR process by rapidly generating the NiOOH active site. Meanwhile, charge redistribution in this heterostructure activates ortho‑carbon in the sulfur-doped carbon as HER active sites, significantly enhancing the HER process. Consequently, NiCo@MoO 2 /SC delivers exceptional catalytic activity in both UOR ( E 10/500/1000 = 1.26/1.38/1.40 V) and HER ( E −10/−500/−1000 = −27/−216/−288 mV). Besides, the carbon-encapsulated strategy improves corrosion resistance to enhance chemical stability, while the micro-nano array structure with the superhydrophilic/superaerophobic surfaces facilitates gas-liquid desorption to boost mechanical stability, enabling stable operation at ±1000 mA cm −2 for 100 h, even in a two-electrode system. This study proposes a viable approach to designing efficiency bifunctional electrocatalysts for urea electrolysis, while broadening the prospects of high-value utilization in biomass-derived carbon materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhong Wang,Xinjia Tan,Chuhan Wang,Guojian Li,Shuang Yuan
Ni/NiO is regarded as an ideal candidate material to replace noble metal catalysts due to its good corrosion resistance and excellent hydrogen evolution activity. However, the poor stability of Ni/NiO catalyst in the process of long-term water electrolysis limits its large-scale application. In this study, a facile hydrothermal method was used to successfully synthesize highly active and stable nanoparticulate Mo–Ni/NiO catalysts. Density functional theory (DFT) shows that Mo doping can optimize the charge transfer of Ni/NiO, reduce the d-band center and accelerate the H* dissociation from the catalyst surface. COMSOL numerical simulation further confirmed that the granular structure can enhance the ion concentration and promote H 2 generation. Electrochemical tests showed that the overpotential of Mo–Ni/NiO was only 45 mV when the current density was 10 mA cm −2 in 1 M KOH solution, which was much lower than 158 mV of Ni/NiO. Furthermore, Mo–Ni/NiO exhibited superior stability when operated at a current density of 10 mA cm −2 for 150 h with a reduction of overpotential of only 2 mV. This work provides a simple method for improving the HER activity of catalysts with Mo doping, which provides a new idea for designing catalysts with high activity, excellent stability and low cost.
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