Journal of Energy Storage
·
2025
·
IF 9.8
Ruiyang Tang,Hui Li,Yu Zhang,Yunbo Zhao,Yang Wu
Designing appropriate semiconductors for photo-assisted supercapacitor serves as a promising means to maximize solar energy use. The efficiency of photogenerated carrier separation is a key to improving the energy storage performance of semiconductor-based photoelectrodes. In this study, we applied dopant-defect engineering to fabricate MnCo 2 O 4 with N doping and oxygen vacancies containing (N-Ov-MCO) for use as a photo-assisted supercapacitor electrode. N doping promoted the generation and effective separation of photogenerated electron-hole pairs under light. In addition, the formed oxygen vacancy facilitates OH − adsorption on the N-Ov-MCO surface combined with DFT simulation findings. As a result, the specific capacitance of N-Ov-MCO (567.25 F g −1 ) at 1 A g −1 under illumination is 1.28 times greater than that of the original MCO. A red LED shone brighter under light when three N-Ov-MCO-based devices (N-Ov-MCO//AC) were linked in series, which demonstrated its practical potential. In the N-Ov-MCO//AC, the photogenerated electrons were introduced into the circuit via nickel foam, which aided in the charging process and the photogenerated holes along with OH − were involved in in the oxidation process. This study revealed that dopant-defect engineering efficiently improves the photo-assisted supercapacitor performance and offers a basis for the theory on practical applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ziying Ji,Ying Feng,Lu Liu,Wei Zheng,Meng Wu,Yuexia Li,Zhengming Sun,Guobing Ying
Energy storage devices are progressively advancing in the light-weight, flexible, and wearable direction. Ti 3 C 2 T x flexible film electrodes fabricated via a non-contact, cost-effective, high-efficiency, and large-scale inkjet printing technology were capable of satisfying these demands in our previous report. However, other MXenes that can be employed in flexible energy storage devices remain undiscovered. Herein, flexible V 2 CT x film electrodes (with the low formula weight vs Ti 3 C 2 T x film electrodes) with both high capacities and excellent photoelectric properties were first fabricated. The area capacitances of V 2 CT x film electrodes reached 531.3–5787.0 μF⋅cm −2 at 5 mV⋅s −1 , corresponding to the figure of merits (FoMs) of 0.07–0.15. Noteworthy, V 2 CT x film electrode exhibited excellent cyclic stability with the capacitance retention of 83 % after 7,000 consecutive charge–discharge cycles. Furthermore, flexible all solid-state symmetric V 2 CT x supercapacitor was assembled with the area capacitance of 23.4 μF⋅cm −2 at 5 mV⋅s −1 . Inkjet printing technology reaches the combination of excellent photoelectric properties and high capacities of flexible V 2 CT x film electrodes, which provides a new strategy for manufacturing MXene film electrodes, broadening the application prospect of flexible energy storage devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Liucheng Cao,Miao Chen,Yiming Zhang,Jingying Hu,Yi Wu,Ying Chen,Ruijia Wang,Haoyi Yuan,Fuxiang Wei,Yanwei Sui,Qingkun Meng,Lifeng Cheng,Shengqi Wang
Manganese-based cathodes are competitive candidates for state-of-the-art aqueous zinc-ion batteries (AZIBs) because of their easy preparation method, sufficient nature reserve, and environmental friendliness. However, their poor cycle stability and low rate performance have prevented them from practical applications. In this study, Mn 3 O 4 nanoparticles were formed in situ on the surface and between the interlayers of Ti 3 C 2 T x MXene, which was pretreated by the intercalation of K + ions. Ti 3 C 2 T x MXene not only provides abundant active sites and high conductivity but also hinders the structural damage of Mn 3 O 4 during charging and discharging. Benefiting from the well-designed K-Ti 3 C 2 @Mn 3 O 4 structure, the battery equipped with the K-Ti 3 C 2 @Mn 3 O 4 cathode achieved a maximum specific capacity of 312 mAh/g at a current density of 0.3 A/g and carried a specific capacity of approximately 120 mAh/g at a current density of 1 A/g, which remained stable for approximately 500 cycles. The performance surpasses that of most reported Mn 3 O 4 -based cathodes. This study pioneers a new approach for building better cathode materials for AZIBs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Peikuan Wang,Tianran Zheng,Shuyang Gan,Jiayu Miao,Jianfeng Yao
Because of its wide range of material sources, high specific surface area, and advantageous electrochemical characteristics, cellulose biochar derived from natural lignocellulosic raw materials has been extensively applied as electrodes for energy storage materials. To produce carbon materials with improved qualities, lignocellulosic substrates often need to be pretreated, activated, and modified. In this study, corncob was processed with bisulfite to break down its recalcitrant structure, followed by direct use of the pretreated substrate to avoid the post-pretreatment washing step and take full advantage of the generated lignosulfonate (LS) in the next pyrolysis process. The residual LS in the pretreated sample not only increased the specific surface area of the corncob-biochar, but also introduced the heteroatom S. The biochar obtained through pyrolysis at 900 °C with KOH activation from unwashed pretreated corncob (ABU-900) had a specific surface area of 3130 m 2 /g, and it displayed a high coulombic efficiency of 94.1% after 5000 cycles in a three-electrode system. Owing to the successful introduction of heteroatoms, an asymmetric supercapacitor device (ABU-900//activated carbon) delivered an excellent specific capacitance of 141.2 F/g at a current density of 1 A/g and an energy density of 43.7 Wh/kg with a power density of 619 W/kg. This work offers a new and simple route for preparing cellulose biochar-based electrodes from lignocellulose waste.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kai Wang,Wenjun Wang,Yan Wang,Miao Wang
The rapid growth of electric vehicles raises an unmet need to enhance high-temperature performance and safety of Li-ion battery (LIB). Herein, polyethylene glycol/polyvinylidene fluoride (PEG/PVDF) core @ polybutylene succinate (PBS) shell separator with cooling and thermal shutdown functions was fabricated using a one-step coaxial electrospinning method. The separator exhibited superior electrochemical performance even at room temperature due to good wettability and high porosity. When battery temperature rises as discharging, PEG with 50 °C melting point (m.p.) will melt to store heat temporarily. Thus, the separator with cooling function can effectively enhance ion conductivity to alleviate specific capacity drop and polarization voltage increase. As temperature decreases after battery discharging, the separator will release thermal energy to prepare for the next working cycle. When thermal runaway happens and raises temperate above 100 °C rapidly, the PBS shell will melt at 110 °C without skeleton thermal shrinkage. Separator pores can be blocked by the melted PBS and Li + ions transfer can be inhibited in time to prevent disastrous consequence. Thus, dual phase change of the separator provides a novel and effective strategy for synergistic performance and safety enhancement of high temperature LIB.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yueyue Ma,Ling Li,Yiman Zhu,Yajing Zhu,Ruqian Lian,Wenming Zhang
Herein, a composite of N -doped carbon coated phosphating cobalt hollow nanofibers (N/C@CoP-HNFs) was synthesized by electrospinning, phosphating, and carbon coating processes. When employed as multifunctional electrode materials for potassium-ion batteries (PIBs) and lithium-sulfur (Li-S) batteries, the N/C@CoP-HNFs demonstrated notable electrochemical properties. Specifically, it delivered an initial specific capacity of 420.4 mA h g −1 at a current density of 100 mA g −1 , with a sustained capacity of 190.8 mA h g −1 after 200 cycles in PIBs, and a specific capacity of 1448 mA h g −1 at a current density of 0.5C in Li-S batteries, which is considered relatively high for these types of battery technology. This good performance may due to the combination of the carbon nitrogen layer and cobalt phosphide bilayer hollow tube structure, which is conducive to telescoping the diffusion length of ions and electrons and buffer volume variation, and effectively inhibits the shuttle effect. Density functional theory (DFT) calculations were also used to explore the energy storage mechanism of the material. The possible adsorption sites and corresponding adsorption energy of K + were analyzed, and the advantages of the material were explored by calculating the diffusion barrier and state density. The theoretical simulations further validated the strong adsorption capability of CoP for polysulfides. This work is expected to provide new ideas for new energy storage materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenhao Peng,Xin Min,Shiping Luo,Aijuan Xie
Transition metal oxides (TMOs) and sulfides (TMSs) have garnered significant attention as promising electrode materials for supercapacitors due to their complementary properties, including high conductivity, abundant active sites, and structural stability. The rational design and facile synthesis of TMO-TMS hybrid materials with unique architectures are critical to achieving high-performance energy storage devices. This study presents a novel CuMn 2 O 4 @CuMn 2 S 4 core-shell nanostructure developed on a nickel foam substrate through hydrothermal and sulfurization processes. The CuMn 2 O 4 core offers robust structural support and high conductivity, while the CuMn 2 S 4 shell enhances electrochemical activity and ion diffusion. The synthesized material, CuMn 2 O 4 @CuMn 2 S 4 NF-2, achieved a specific capacitance of 760.5 F·g −1 at 1.0 A·g −1 , demonstrating superior electron transfer resistance ( R ct =2.06 Ω) and excellent cycling stability, retaining 85.2 % of capacitance after 5000 cycles. Furthermore, an asymmetric supercapacitor (ASC) with CuMn 2 O 4 @CuMn 2 S 4 NF-2 as the positive electrode and activated carbon as the negative electrode delivered a maximum energy density of 35.31 Wh·kg −1 at a power density of 750 W·kg −1 and retained 75.5 % capacitance after 5000 cycles. This study underscores the significant potential of integrating oxide and sulfide materials in a single architecture, offering a promising pathway for designing high-performance energy storage systems that capitalize on the synergistic properties of both material types.
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BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Bo Yin,Hai Tian,Haiyong He,Kam Loon Fow,Honglei Zhang,George Z. Chen,Di Hu
Biomass-derived carbon for supercapacitors faces the challenge of achieving hierarchical porous carbon with graphitic structure and specific heteroatoms through a single-stage thermal process that minimises resource input. Herein, molten base carbonisation and activation is proposed. The process utilises the inherent moisture of Moso bamboo shoots, coupled with a low amount of KOH, to form potassium organic salts before drying. The resultant potassium salts promote in-situ activation during single-stage heating process, yielding hierarchical porous, large specific surface area, and partially graphitised carbon with heteroatoms (N, O). As an electrode material, this carbon exhibits a specific capacitance of 327F g −1 in 6 M KOH and 182F g −1 in 1 M TEABF 4 /AN, demonstrating excellent cycling stability over 10,000 cycles at 2 A/g. Overall, this study presents a straightforward process that avoids pre-drying of biomass, minimises base consumption, and employs single-stage heating to fabricate electrode carbon suitable for supercapacitors.
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Nano Energy
·
2024
·
IF 16.8
Shanyong Chen,Tao Luo,Xiaoqing Li,Kejun Chen,Qiyou Wang,Junwei Fu,Kang Liu,Chao Ma,Ying-Rui Lu,Hongmei Li,Kishan S. Menghrajani,Changxu Liu,Stefan A. Maier,Ting-Shan Chan,Min Liu
Metal-nitrogen-carbon single-atom catalysts (SACs) have emerged as promising candidates for electrocatalytic CO 2 reduction reaction. However, the perpendicular d z 2 orbital within planar metal site mainly interacts with *COOH, resulting in inferior CO 2 activation. Inspired by reaction-driven active configuration, here we propose to upshift nickel single-atom away from nitrogen-carbon substrate, prominently promoting the interaction between CO 2 and other d orbitals besides d z 2 . Theoretical and experimental analyses reveal that upshifting nickel site away substrate induces d xz , d yz , and d z 2 to hybridize with CO 2 , expediting CO 2 conversion to *COOH. The planar and out-of-plane Ni-N sites are formed on carbon nanosheet (Ni 1 -N/C NS ) and curved nanoparticle (Ni 1 -N/C NP ), respectively, which is verified by X-ray absorption fine structure spectroscopy. Impressively, the Ni 1 -N/C NP presents CO Faradaic efficiency of 96.4 % at 500 mA cm −2 and energy conversion efficiency of 79.8 % in flow cell, outperforming Ni 1 -N/C NS and most SACs. This work highlights the simulation of reaction-driven active sites for efficient electrocatalysis .
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International Journal of Electrochemical Science
·
2025
·
IF 2.4
Gaosheng Nie,Xiongfei Sun,Liyin Xu,Ke Wu,Zilong Wei,Shuwu Liu
MOF-derived cobalt oxides (CoO x ) have attracted extensive attentions due to their excellent theoretical specific capacitances, permanent porosity and controllable structures. However, the inherent poor conductivity of single-component cobalt oxide, and the structural collapse, pore loss and agglomeration during pyrolysis process are still the main factors to limit the performance of CoO x . Structure design of 3D hierarchical porous heterostructure composites through 0D/1D/2D materials is an effective strategy for boosting the capacitive performance of CoO x . Herein, the rationally designed 3D hierarchically porous CoO x /MWCNTs/rGO ternary hybrid composite was constructed through high-temperature pyrolysis of a facile self-assembled 0D/1D/2D Co-MOF/MWCNTs/GO precursor. Indeed, The CoO x /MWCNTs/rGO electrode exhibited an excellent specific capacitance of 520 F g −1 at 0.5 A g −1 , outstanding rate capability of 80.77 % capacitance retention even at 20 A g −1 , and ideal durability with about 8.4 % capacitance decay after 10000 cycles. Moreover, the CoO x /MWCNTs/rGO exhibited a maximum energy density of 14.6 Wh kg −1 with a power density of 41.2 W kg −1 .
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Yuyang Li,Peng Wang,Qiaofu Shi,Fucheng Hu,Xinwei Zhang,Xue Xu,Jun Zhang,Jie Zheng,Yunze Long
Hydrogen production via seawater electrolysis, leveraging sustainable energy sources such as offshore wind or solar energy, has immense application potential. However, the abundance of chloride ions (Cl − ) in seawater leads to the generation of chlorine gas and hypochlorite at the anode during electrolysis, posing a severe threat of corrosion of the catalyst and electrolytic equipment. Herein, we synthesize a NiMo-based catalyst adorned with surface-anchored graphene quantum dots (GQDs). This catalyst possesses excellent Cl − exclusion capabilities. The Mo–NiS/Se@GQDs core–shell nanorod catalyst requires only 170 mV of overpotential to attain a current density of 10 mA cm −2 and operates stably for 200 h without degradation across a broad current density range from 100 to 400 mA cm −2 . This remarkable electrocatalytic stability arises from the dynamic and efficient repulsion of Cl − at the catalytic interface, as proven by the post-reaction analysis of Cl − distribution within the catalyst. Furthermore, a potentiodynamic polarization test revealed that the Mo–NiS/Se@GQDs catalyst has high corrosion potential (0.66 V) and low corrosion current density (122.93 μA cm −2 ), underscoring its excellent corrosion resistance. This research presents a novel approach to mitigate Cl − corrosion during hydrogen production through seawater electrolysis, laying a solid foundation for advancing sustainable energy conversion technologies.
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2024
·Vol. 31
·期 6
·1502-1513
·
IF 3.1
Yang Bo-lin,Kuang Chang-liu,Liu Zheng-long,Yu Chao,Deng Cheng-ji,Ding Jun
ZrB 2 -based ceramic composites were prepared by spark plasma sintering using ZrB 2 powder prepared by molten salt method as raw material and SiC and nano-graphite as additives. The effects of nano-graphite addition on the physical properties and oxidation resistance of ZrB 2 -based ceramic samples were investigated. The results show that the addition of an appropriate amount of nano-graphite can effectively improve the density of ZrB 2 -based ceramic composites and improve the physical properties of the materials. The flexural strength of the ceramic sample with 8 vol.% nano-graphite reached 418.54 MPa, which was 53.14% higher than that of ZrB 2 –SiC ceramic material (273.31 MPa), and its oxidation resistance was also significantly improved. It demonstrats that the addition of an appropriate amount of nano-graphite can effectively improve the physical properties and oxidation resistance of ZrB 2 –SiC ceramic composites. Via prolonging its service life in application and promoting the development of ZrB 2 -based ceramic composites, it is of great significance for clean steel smelting.
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