JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Tao Tang,Le-Qing Fan,Xiao-Yun Fu,Long Chen,Shi-Hua Lin,Xin-Yuan Song,Li-Na Wang,Fu-Da Yu,Yun-Fang Huang,Lan-Fang Que,Ji-Huai Wu
The electrochemical performances of lithium-ion capacitors (LICs) are severely hindered by the mismatch in reaction kinetics between the anode and cathode. Herein, to enhance the anode conductivity and improve the Li + ion diffusion rate for better kinetic matching, Ti 3 C 2 T x (MXene) sheets, known for their high electrical conductivity and excellent mechanical properties, were selected as a support for ZnSe. Simultaneously, the carbonization of hexadecyl trimethyl ammonium bromide reactant generated a carbon coating on the ZnSe surface. The results indicate that Ti 3 C 2 T x and the in-situ generated carbon reduce the aggregation of ZnSe particles, leading to the formation of ZnSe/Ti 3 C 2 T x /C composite with a large specific surface area of 46.5 m 2 g –1 . The synergistic effect of Ti 3 C 2 T x and carbon enhances the Li + ion storage performance of the ZnSe anode, achieving a remarkable reversible discharge specific capacity of 1006.3 mAh g –1 after 450 cycles at 0.2 A g –1 , along with improved Li + ion transfer capability. Ethylene glycol-reduced graphene oxide (EG-RGO) was also prepared; it has a large average discharge specific capacity of 84.7 mAh g –1 at 0.1 A g –1 . An optimized ZnSe/Ti 3 C 2 T x /C//EG-RGO LIC achieves a prominent energy density of 119.4–34.5 Wh kg –1 at a power density of 156.8–15525.0 W kg −1 , along with an impressive cycling span, retaining 84.1 % of its capacity after 5000-cycle test at 0.5 A g –1 .
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xuewei Ba,Xinyu Lan,Huaikang Zhang,Cheng Cheng,Wenping Huang,Xinyu Han,Deqing Zhang,Yan Yu
Transition metal compounds have garnered significant attention due to their high specific surface area, tunable composition, and synergistic effects. These materials exhibit excellent electrochemical performance, making them some of the most promising candidates for pseudocapacitive applications. Herein, cobalt selenide (CoSe), nickel selenide (NiSe), and trinickel diselenide (Ni 3 Se 2 ) nanosheets were grown on nickel foam using a simple two-step hydrothermal method. The three-dimensional network structure of the CoSe/NiSe/Ni 3 Se 2 @NF composite material provides a larger specific surface area and more electrochemically active sites. This architecture facilitates rapid electron transfer, enhances electrochemical performance, and results in a high specific capacitance of 2300.65 F· g −1 at a current density of 1 A· g −1 . The asymmetric supercapacitor device, assembled with CoSe/NiSe/Ni 3 Se 2 @NF as the positive electrode and activated carbon as the negative electrode, demonstrates an energy density of 63.16 Wh·kg −1 at a power density of 805.73 W·kg −1 . These outstanding electrochemical properties suggest that CoSe/NiSe/Ni 3 Se 2 @NF composite materials hold great potential as an energy storage material.
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Small
·
2024
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IF 13
Xinyu Wang,Lei Yang,Huanyu Liang,Chunliu Zhu,Jing Shi,Jingyi Wu,Jingwei Chen,Weiqian Tian,Yue Zhu,Huanlei Wang
The poor cycling stability and rate performance of transition metal selenides (TMSs) are caused by their intrinsic low conductivity and poor structural stability, which hinders their application in potassium-ion batteries (PIBs). To address this issue, encapsulating TMSs within carbon nanoshells is considered a viable strategy. However, due to the lack and uncontrollability of internal void space, this structure cannot effectively mitigate the volume expansion induced by large K + , resulting in unsatisfactory electrochemical performance. Herein, peanut-shaped FeSe 2 @carbon yolk-shell capsules are prepared by modulation of the internal space. The active FeSe 2 is encapsulated within a robust carbon shell and an optimal void space is retained between them. The outer carbon shell promotes electronic conductivity and avoids FeSe 2 aggregation, while the internal void mitigates volume expansion and effectively ensures the structural integrity of the electrode. Consequently, the FeSe 2 @carbon anode demonstrates exceptional rate performance (242 mAh g −1 at 10 A g −1 ) and long cycling stability (350 mAh g −1 after 500 cycles at 1 A g −1 ). Furthermore, the effect of internal space modulation on electrochemical properties is elucidated. Meanwhile, ex situ characterizations elucidate the K + storage mechanism. This work provides effective guidance for the design and the internal space modulation of advanced TMSs yolk-shell structures.
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ACS Photonics
·
2024
·
IF 6.5
Qinxue Yin,Xiao Xing,Qiaoyan Hao,Zeyu Zhang,Chunwei Wang,Xingyu Yue,Ziwei Li,Wenjing Zhang,Yuxin Leng,Juan Du
Valleytronics, focusing on the charge carriers occupying valleys (local energy extrema) of the energy bands in semiconductors, demonstrates an additional degree of freedom besides the spin and charge. Usually, the inequivalent valley “states” in transition metal disulfides (TMDs) could be manipulated by external magnetic fields by controlling the valley-polarized carriers in spin-coupled valleys. Here, we found that the valley polarization of the photocurrent in ε-InSe could be intrinsically manipulated without the external field by the all-optical contactless method. The transient circular photogalvanic effect (CPGE)-induced photocurrent revealed by terahertz emission could be reversed only by selected pumping carriers from vertically split valence bands into different Rashba valleys. The switchable Rashba valley polarization, i.e., the optical orienting valley degree of freedom, could be fulfilled by the synergetic effects between the momentum-dependent Zeeman-like field due to the emergent nonzero Berry curvature and the Rashba splitting. Our results suggest that the spontaneous symmetry breaking could degenerate the given valley in ε-InSe and give a new roadmap for the manipulation of the valley degree of freedom intrinsically.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
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IF 15.7
Song Zhilong,Fan Linfeng,Lu Shuaihua,Ling Chongyi,Zhou Qionghua,Wang Jinlan
Directly generating material structures with optimal properties is a long-standing goal in material design. Traditional generative models often struggle to efficiently explore the global chemical space, limiting their utility to localized space. Here, we present a framework named Material Generation with Efficient Global Chemical Space Search (MAGECS) that addresses this challenge by integrating the bird swarm algorithm and supervised graph neural networks, enabling effective navigation of generative models in the immense chemical space towards materials with target properties. Applied to the design of alloy electrocatalysts for CO 2 reduction (CO 2 RR), MAGECS generates over 250,000 structures, achieving a 2.5-fold increase in high-activity structures (35%) compared to random generation. Five predicted alloys— CuAl, AlPd, Sn 2 Pd 5 , Sn 9 Pd 7 , and CuAlSe 2 are synthesized and characterized, with two showing around 90% Faraday efficiency for CO 2 RR. This work highlights the potential of MAGECS to revolutionize functional material development, paving the way for fully automated, artificial intelligence-driven material design.
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Journal of Energy Chemistry
·
2024
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IF 14
Shicheng Deng,Songfan Wang,Yuanyuan Wang,Qian Xiao,Yuena Meng,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Zhi Zheng,Sixin Wu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from severe carrier recombination, limiting the photovoltaic performance. Unfavorable energy band alignment at the p-n junction and defective front interface are two main causes. Herein, oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the defects. With optimized oxygen incorporation conditions, the carrier separation and collection behavior at the front interface of the device is improved. In particular, it is found that oxygen incorporated absorber exhibits increased band bending, larger depletion region width, and suppressed absorber defects. These indicate the dynamic factors for carrier separation become stronger. Meanwhile, the increased potential difference between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier transport. As a consequence, the champion efficiency of CZTSSe solar cells has been improved from 9.74% to 12.04% with significantly improved open-circuit voltage after optimized air-annealing condition. This work provides a new insight for interface engineering to improve the photoelectric conversion efficiency of CZTSSe devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hui Zhang,Jiatong Li,Yajun Zhu,Xiangbing Zeng,Chengbing Chen,Huigang Zhang,Jinyun Liu
Large theoretical capacity silicon (Si) anode for lithium-ion (Li-ion) battery is hindered by its large volumetric change and structural collapse during cycling. Here, we report a strategy that in-situ embedding Si nanoparticles (Si NPs) into flower-like selenides, then coating with carbon layer, forming a Si@ZnSe/CoSe@C anode. Engineered frame structure provides an optimized condition for alleviating volumetric of Si, and thereby improving stability. Additionally, carbon layer not only immobilize Si NPs, but also improves the conductivity. The Si@ZnSe/CoSe@C anode shows a capacity of 563 mAh g −1 after 150 cycles at 0.1 A g −1 , and a Coulombic efficiency as high as 99.4 % after cycling 800 times at 0.2 A g −1 . A 50 °C-tolerable performance is also obtained, showing a potential for applications. We believe that the composite design presented here offers a general method for developing high-performance energy-storage materials even though they intrinsically have large-volumetric change and low conductivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ao Zhou,Wenwen Cai,Weijian Guo,Jizhen Ma,Yueqing Wang,Jintao Zhang
Designing highly effective, low-cost bifunctional electrocatalysts without noble metals for overall water splitting remains a significant challenge. In this work, interfacial coupling of Ce-doped CoSe 2 nanoneedle arrays with MXene (Ce-CoSe 2 /MXene) is developed via the facile hydrothermal and selenization methods. The extensive specific surface area and favorable hydrophilicity of Ti 3 AlC 2 , combined with the optimized electronic structure and abundant active sites from Ce-doping and selenization, contribute to the exceptional bifunctional electrocatalytic performance of the Ce-CoSe 2 /MXene electrode. Specifically, this heterostructure achieves a low hydrogen evolution reaction (HER) overpotential of 34 mV at 10 mA cm −2 , an oxygen evolution reaction (OER) overpotential of 279 mV at 100 mA cm −2 , and an overall water splitting (OWS) potential as low as 1.45 V at 10 mA cm −2 . In-situ Raman spectroscopy reveals that surface reconstruction would improve catalytic activity and stability. Theoretical calculations indicate that the Ce-CoSe 2 /MXene can improve the adsorption of intermediates and facilitate HER/OER process by lowering the kinetic barrier, thereby enhancing electrocatalytic activity. This research marks a substantial advancement in the development of low-cost, efficient electrocatalysts for overall water splitting.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiao-Man Cao,Yi-Feng Shao,Yan-Cun Dong,Qingguo Zhang,Hao Ge,Daliang Liu,Qiong Wu,Zhi-Jia Sun
The unique structure and strong interaction of multiphase hybrid materials have garnered significant attention as prospective candidates for electrode materials in the realm of energy storage. The present study presents a rational design of a functional NiSe 2 -CoSe 2 /N, B double-doped carbon hybrid composite (NCS/C NB ), resulting in the emergence of various novel cooperative regulatory mechanisms involving: (i) the heterogeneous structure of NiSe 2 and CoSe 2 generates built-in electric fields to increase electron mobility; (ii) the incorporation of polyatomic double-doped carbon (N, and B) expedites electron transfer rate; intriguingly, (iii) ionic liquids not only serve as polyatomic dopants in the reaction system but also influence the microstructure of the composite. Benefiting from these synergistic effects, the NCS/C NB hybrid exhibits remarkable charge storage capacity and rapid electrochemical kinetics, driven by its multi-fold hollow structure and multicomponent cooperative modulation. The capacity (682 C g −1 at 1 A g −1 ) and rate performance of NCS/C NB surpass those of other monometallic selenides (NiSe 2 /N, B co-doped carbon (NS/C NB ) and CoSe 2 /N, B co-doped carbon (CS/C NB )) within the same system. In the meantime, an asymmetric device using NCS/C NB as the cathode material performs admirably, displaying an exceptional energy density (51.3 Wh kg −1 at 1.28 kW kg −1 ). The present research provides valuable perspectives for the innovative design and fabrication of advanced electrode materials exhibiting exceptional electrochemical properties. We firmly believe that hollow structures featuring multiple cooperative regulatory mechanisms and abundant folds will garner significant attention.
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Journal of Materials Chemistry A
·
2025
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IF 9.5
Fayun Wei,Fanghua Liang,Yanrui Zhao,Zhuyu Ji,Ruiqing Li,Hui Liu,youchao Kong,Honggang He,Weichun Huang,Chunyan Cao,Wei Zhang,Bin Fei,Mingzheng Ge,Tingting Yan
High-capacity conversion-type anodes with high volume expansion and low conductivity face limitations in meeting the high energy density demands of lithium-ion batteries. Herein, MOF-derived CoSe2/ZnSe bimetallic selenide nanoparticles are confined in layered Ti3C2Tx MXene (CoSe2/ZnSe@MX) as electrodes for high-performance lithium-ion batteries by in-situ self-assembly and selenization strategy. The interconnected conductive MXene networks not only can provide highways for charge transfer, but also can effectively accommodate the large volume expansion, improving the structural stability. Meanwhile, the bimetallic CoSe2/ZnSe nanoparticles with heterostructures and Se vacancies offer abundant redox reaction sites, promote Li-ions diffusion, and enhance Li-ions adsorption. Thus, the CoSe2/ZnSe@MX electrodes exhibit a remarkable capacity of 830.8 mAh g-1 at 0.1 A g-1, high-rate capability of 290.8 mAh g-1 at 5 A g-1, and superior cycling stability with 63.1% capacity retention after 2000 cycles. Furthermore, the full cell was demonstrated practical applicability with a high capacity of 156 mAh g-1 at 0.1 C. This facile technique is promising to construct high-performance energy storage devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
He Zhou,Dezhi Kong,Ningning Chu,Hui Wang,Jie Xu,Ye Wang,Tingting Xu
The development of sustainable energy technologies relies on the exploitation of efficient and durable electrocatalysts for water splitting at high current densities. Our work presents a novel bifunctional catalyst, denoted as NM@NC/CC, which combines the benefits of NiSe 2 -MoSe 2 heterojunctions with nitrogen-enriched porous carbon derived from metal-organic frameworks (MOFs). The integration of these components is designed to harness their combined advantages, which include enhanced electron transfer, improved mass and gas evolution dynamics, and an increased number of catalytically active sites. These features collectively optimize the energetics for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). As a result, the catalyst facilitates rapid kinetics for the overall water-splitting process. The NM@NC/CC demonstrates low overpotentials, requiring only 91 mV for the HER and 280 mV for the OER to reach a current density of 10 mA cm −2 . Even at higher current densities of 100 mA cm −2 for HER and 50 mA cm −2 for OER, the overpotentials are only 159 mV and 350 mV, respectively. Additionally, a two-electrode setup using this catalyst achieves a current density of 10 mA cm −2 with a minimal cell voltage of 1.56 V. The insights gained from this study will contribute to the advancement of electrocatalysts for energy conversion technologies.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Jianpu Lin,Shengjie Zhang,Lingfeng Du,Baiquan Zhang,Xiongtu Zhou,Yongai Zhang,Chaoxing Wu
The wavelength tunable and environmentally friendly InP quantum dots are considered one of the most powerful alternatives to cadmium-based quantum dots, and the luminescent devices prepared with them also show great potential. There is still room for improvement in the synthesis methods and device applications of InP based quantum dots. In this work, we report one pot synthesis route for InP/ZnSe/ZnSeS/ZnS green QDs based on tris(dimethylamino)phosphine (DMP) phosphorus by using the strategy of multi shell coating and gradient heating to reduce surface defects of quantum dots. The shell structure, dosage, and growth temperature have all been taken into account in order to explore better performance of InP QDs. The synthesized green quantum dots have 86 % PLQY and a full width at half maximum of 36 nm. In addition, the synthesized green InP quantum dots are applied in AC QLED devices. The experimental results show that the luminescence intensity is affected by the driving voltage and frequency, which is similar to the working mode of non-carrier-injected emitting devices. And there is a matching value between the voltage and frequency.
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