International Journal of Electrochemical Science
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2024
·
IF 1.3
Ying Geng,Chun-yong Zhang,Lin Zhu,Hao-yu Wang,Ji-rong Bai,Jing-jing Huang,Zhen-long Zhao
s Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co 3 O 4 @Mn 3 O 4 /Mn 2 O 3 catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec ‐1 , by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg -1 and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.
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Journal of Energy Storage
·
2024
·
IF 8.9
X.U. Yang,Z.H.E.N.G. Leizhi,L.I.U. Chengbao,C.H.E.N. Feng,Q.I.A.N. Junchao,Q.I.U. Yongbin,M.E.N.G. Xianrong,C.H.E.N. Zhigang
Due to its special electron configuration, large number of electrochemical reactive sites, and a high theoretical specific capacitance, Ni 0.85 Se has great application potential for supercapacitor electrodes. However, the poor charge driving ability and easy aggregation of Ni 0.85 Se hinder the full utilization of its electrochemical reactive site, thus limit its practical application. Here, nano-rod-like highly crystalline graphitic carbon nitride (CCN) was synthesized via molten salt assisted method, and then CCN/Ni 0.85 Se composite nanomaterials were synthesized by hydrothermal induction. Through various characterization and electrochemical tests, nano-rod-like CCN not only improves the poor electrical conductivity and incomplete surface reactive site exposure of bulk g-C 3 N 4 prepared by traditional thermal polymerization, but also improves the charge dynamics and enrich the electrochemical active sites of sheets Ni 0.85 Se, and improves the electrochemical activity of the composite. On the base of results, CCN/Ni 0.85 Se-7 has the best specific capacitance of 1234 F g −1 at 1 A g −1 , which is significantly higher than that of pure phase Ni 0.85 Se (841.2 F g −1 ) and CCN (34.4 F g −1 ). The CCN/Ni 0.85 Se-7//AC two-electrode device exhibited a maximum energy density of 29.11 Wh kg −1 , a maximum power density of 8499.86 W kg −1 , and good capacitance retention ability of 81.46 % after 2000 cycles.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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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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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xiaozhong Zhou,Xiaoyan Zheng,Hejie Lu,Hongling Deng,Zheyi Liu,Jiangwei Deng
Antimony oxides are of great promise for lithium storage due to their high theoretical capacity, but low intrinsic conductivity and large volume change during lithium-ion insertion/extraction lead to inferior cycling stability. Herein, Sb 6 O 13 nanocrystals were successfully embedded in three-dimensional (3D) honeycomb-like reduced holey graphene oxides (HrGO) sheets by H 2 O 2 -assisted solvothermal method, and the as-synthesized Sb 6 O 13 /HrGO composite was demonstrated to deliver superior electrochemical lithium-storage performance. During the preparation process, graphene oxides (GO) sheets were pretreated with H 2 O 2 to boost formation of in-plane nanoholes, which play crucial roles in both constructing Sb 6 O 13 /HrGO with unique 3D honeycomb-like structure and boosting lithium-storage kinetics. 3D interconnect HrGO sheets with honeycomb-like structure construct a stereoscopic conductive network skeleton for fast electron transfer and alleviating volume expansion of active components during charging/discharging process. Moreover, abundant in-plane nanoholes enable lithium ions to migrate cross graphene sheets, resulting in shortening diffusion distance and fastening diffusion kinetics. Thus, Sb 6 O 13 /HrGO electrode exhibited a high reversible capacity of 956.1 mA h g −1 (200 mA g −1 ) based on conversion-alloying mechanism and superior high-rate capability (493.4 mA h g −1 at 1000 mA g −1 ) for lithium storage. This work provides a facile, environmental-friendly and scalable strategy to fabricate composites with special structures for high-rate energy storage.
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Nano Energy
·
2025
·
IF 17.1
Xin Zhao,Qian Guo,Ce Gao,Shuangxi Nie,Runcang Sun
Most reported hydrogel electrolytes exhibit incompatible electrolyte-electrode interface, overhigh modulus, extreme environment inadaptation, high costs and toxic residual. Inspired by moisturizing and ductile properties from skin, this study presents a cost-effective, low-toxicity and self-healing hydrogel electrolyte composed of gelatin, lignin sulfonate and LiBr. The hydrogen bonds within hydrogel electrolyte were significantly weakened by LiBr, thereby exhibiting ultra-soft properties under the fracture stress of 8.5 kPa and strain of 1558 %, retaining an elongation of 1030 % after instantaneous self-healing, and remaining electrolyte-electrode interface stable. Additionally, abundant disordered hydrogen bonds and remarkable hydration capability of the hydrogel electrolyte endowed the ultra-high ionic conductivity (1.26 mS/cm at −50 °C) and adaptability under extreme environment. Notably, the assembled supercapacitor remains effectively electrochemical performance from severe dehydration to ambient environment. This work provides insights for design of flexible hydrogel electrolytes with excellent environmental adaption.
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Surfaces and Interfaces
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2024
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IF 5.7
Jiyan Li,Meichen Liu,Min Qiao,Fei Wang,An Li
Solar-driven interfacial evaporation co-generation (SDIE-CG) technology can effectively solve problems such as low latent heat utilization in the evaporation process, which provides a reliable solution to the problem of hydropower shortage in remote areas. Herein, we report a tea residue microcrystalline cellulose (TMCC) aerogel (abbreviated as TCA), in which TMCC is regenerated by dissolution through the co-solvent method, and microcrystalline cellulose is rearranged by the directional slow freezing technique to get a TCA with a directional aligned pore structure, resulting in a good mechanical and salt-resistant property. Due to the internal doping of carbon black particles, the TCA has an average ultra-high absorbance of 97.46 %. The evaporation rate of TCA is up to 3.066 kg m −2 h −1 under 3 kW m −2 illuminations. The maximum output voltage of the TCA is 44.801 mV under 2 kW m −2 illuminations through the introduction of a suitable wind-assisted hydropower generation device. In addition, the TCA can effectively purify the wastewater containing traditional Chinese medicine, and the chemical oxygen demand (COD) value in wastewater shows a significant decrease after treatment. It is worth noting that TCA can maintain structural integrity and stable evaporation performance in saltwater under extreme pH conditions (2
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jiasheng Huang,Jiaxin Dang,Heng Xu,Xin Zhang,Liusheng Xiao,Da Zheng,Jianxin Wang,He Miao,Jinliang Yuan
To address the low energy efficiency of zinc-air batteries (ZABs), this work proposes a novel methanol-assisted ZAB (M-ZAB). The battery employs the multi-component metal sulfide as the cathode, where the cathodic charging reaction of oxygen evolution reaction (OER) is replaced by the methanol oxidation reaction (MOR). The multi-component metal sulfide is synthesized by converting the medium-entropy alloy of NF-CoFeNiCuAl into the corresponding sulfide (NF-CoFeNiCuAl-S) through a simple hydrothermal method. NF-CoFeNiCuAl-S retains the high OER/MOR activity of NF-CoFeNiCuAl while exhibiting significantly improved oxygen reduction reaction (ORR) catalytic performance. NF-CoFeNiCuAl-S demonstrates the OER and MOR potentials of 1.49 V and 1.372 V at 100 mA cm⁻², respectively, and an ORR potential of 0.66 V at 10 mA cm⁻². Aqueous and flexible ZABs based on NF-CoFeNiCuAl-S achieve the peak power densities of 210.3 and 180.6 mW cm⁻², respectively, along with excellent cycling stability. Compared to traditional ZABs without methanol in the electrolyte, M-ZAB shows a reduction in the charge-discharge voltage gap by 471 mV (@100 mA cm -2 ) and an improvement in energy efficiency by 14%.
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CORROSION SCIENCE
·
2025
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IF 8.5
Huan Guo,Bingzhu Wang,Ruifeng Li,Cheng Su,Jixiang Dai,Yong She,Yongzhong Zhao,Jianjun Sha
Aiming at forming a stable ablation layer for hafnium-based ultrahigh-temperature ceramics under ablation environment, in this work, the Ta-based ceramic was introduced into the Hf-based ceramic, and the effect of Hf/Ta molar ratios on the ablation response behavior and mechanism of (Hf, Ta)B 2 -(Hf, Ta)C-SiC ceramics was investigated. It was found that the introduction of Ta could form a continuous and dense ablation layer. When Hf/Ta= 0.9:0.1, the ceramic composite presented excellent ablation resistance, and the linear ablation rate was −0.083 μm/s, which was only 5.85 % of that of Hf-based ceramics (HfB 2 -HfC-SiC). The excellent ablation resistance attributed to that the ablation products (Ta 2 O 5 and Hf 6 Ta 2 O 17 ) could strongly bonded to the substrate, which was conducive to enhance the stability of the ablation layer.
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BULLETIN OF MATERIALS SCIENCE
·
2025
·Vol. 48
·期 1
·1-9
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IF 2.1
Qi Wenqian,Deng Bo,Mao Hui
Despite the low levels of copper ions in aquatic environments, excessive concentrations of copper ions can eventually cause serious harm to animals and humans as they are biologically enriched and ecologically cycled. Herein, an appropriate and selective separating material for copper ions with low concentrations needs to be developed. In the present work, bayberry tannin-modified chitosan fibres (TMF) were fabricated for selective removal of Cu 2+ . The adjacent phenolic hydroxyl groups at the B ring of tannin enable them to chelate with heavy metal ions, while the fibre structure of chitosan is conducive to the extended distribution of the active sites. It showed an adsorption capacity of 14.98 mg g –1 for Cu 2+ at 303 K, which was higher than that of most conventional adsorbents and activated carbon. Moreover, in the presence of co-existing heavy metal ions, including Ni 2+ , Cd 2+ , Fe 3+ and Cr 3+ , we found that TMF showed highly selective adsorption of Cu 2+ , with Cu 2+ concentrations as low as 5 mg l –1 . The TMF can be robustly recycled through acid treatment with 96.6% desorption efficiency.
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MOLECULES
·
2024
·Vol. 29
·期 6
·1362
·
IF 4.2
Zisheng Shi,Wei Chen,Yin Hu,Fen Zhang,Lingling Wang,Dan Zhou,Xuanye Chen,Sugang Meng
In recent years, oxygen vacancy (VO) engineering has become a research hotspot in the field of photocatalysis. Herein, an efficient GQDs/BiOCl-VOheterojunction photocatalyst was fabricated by loading graphene quantum dots (GQDs) onto BiOCl nanosheets containing oxygen vacancies. ESR and XPS characterizations confirmed the formation of oxygen vacancy. Combining experimental analysis and DFT calculations, it was found that oxygen vacancy promoted the chemical adsorption of O2, while GQDs accelerated electron transfer. Benefiting from the synergistic effect of oxygen vacancy, GQDs, and dye sensitization, the as-prepared GQDs/BiOCl-VOsample exhibited improved efficiency for RhB degradation under visible-light irradiation. A 2 wt% GQDs/BiOCl-VOcomposite effectively degraded 98% of RhB within 20 min. The main active species were proven to be hole (h+) and superoxide radical (·O2−) via ESR analysis and radical trapping experiments. This study provided new insights into the effective removal of organic pollutants from water by combining defect engineering and quantum dot doping techniques in heterojunction catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Fang Liu,Dazhi Gao,Fangqing Wang,Pengcheng Shen,Yang Liu,Shiqing Zhang,Ying Li,Jun Zhang,Yanming Xue,Chengchun Tang
The electrocatalytic oxygen reduction reaction (ORR) is crucial for energy conversion systems such as fuel cells and metal-air batteries . Boron carbon nitrogen (BCN) is a novel functional material with a high specific surface area , excellent corrosion resistance , and outstanding electrochemical stability. These properties make BCN an effective ORR catalyst and a promising support for metal catalysts . This study leveraged the strong interaction between BCN and metals to anchor platinum nanoparticles (Pt NPs) onto the BCN surface (Pt/BCN), significantly enhancing the durability of traditional Pt/C catalysts in ORR. The half-wave potential of Pt/BCN is 0.927 V, higher than Pt/XC-72R (0.857 V) and commercial Pt/C (0.879 V). Notably, after 10,000 durability test cycles, the mass activity (MA) of Pt/XC-72R and commercial Pt/C decreased by 67 % and 75 %, respectively. Even after 50,000 cycles, Pt/BCN exhibited only a 54 % decrease in MA. Experimental data and density functional theory calculations confirmed increased electron transfer from Pt to the BCN support, indicating a strong electronic metal-support interaction (EMSI) between Pt and BCN. This strong EMSI effectively anchored the Pt NPs, preventing migration and aggregation during the ORR process. Consequently, our research introduces a novel electrocatalyst support material with significant potential for ORR and broader applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jianfei Li,Qichang Wang,Wenjie Zhang,Kai Zhang,Dekui Shen
The coupling of cobalt and cobalt phosphides has been demonstrated to be an efficient strategy to enhance the catalytic activity for hydrogen evolution reaction (HER). Herein, the lignin-based carbon encapsulated cobalt/cobalt phosphides heterojunctions (Co/Co 2 P@LGC) was synthesized successfully on the lignin-based carbon by carbothermal reduction integrated with post-phosphidation. The strong coupling interaction in the heterostructure promoted the establishment of a distinct synergy effect between Co and P atoms, resulting in the redistribution of electronic structure. The outstanding porous sheet structure of lignin-derived carbon facilitated the exposure of more accessible active sites and self-dopants were conducive to the formation of more carbon defects. As expected, the best catalysts, Co/Co 2 P@LGC-450 exhibited excellent HER performance in 0.5 M H 2 SO 4 , which afford a current density of 10 mA/cm 2 with only 150 mV and a Tafel slope of 86 mV dec −1 , as well as a robust stability for 120 h at 10 mA cm −2 . This research not only presented a facile method for heterostructure electrocatalysts preparation, but also offered crucial insights into the lignin valorisation.
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