ChemistrySelect
·
2025
·Vol. 10
·期 35
·e03319
·
IF 2
Simombela Mikunga,Chanez Maouche,Peter Phiri,Shuang Wang,Chao Cheng,Juan Yang
The development of cost-effective, high-performance oxygen reduction reaction (ORR) electrocatalysts is pivotal for advancing energy conversion technologies such as metal–air batteries and fuel cells. Herein, we report a facile and efficient strategy to synthesize Mn nanoparticles loaded on N-doped hierarchically porous carbon framework (Mn/N-C) through utilizing ZIF-8 as a carbon/nitrogen precursor and MnCl 2 ·4H 2 O as the Mn source. The synthesis integrates mechanical grinding with an NaCl-assisted pyrolysis process, where molten NaCl acts as a dynamic template and intercalation agent to prevent structural collapse during carbonization, thereby creating a 3D porous architecture with coexisting micro-, meso-, and macropores. Physicochemical characterization reveals that the Mn/N-C-2 sample exhibits a high specific surface area (1770 m 2 /g), abundant defects, and uniform dispersion of Mn nanoparticles within the N-doped carbon matrix. Electrochemical evaluations demonstrate that Mn/N-C-2 catalyst possesses a higher half-wave potential ( E 1/2 ) of 0.836 V and a larger limiting current density ( J L ) of 5.54 mA/cm 2 , surpassing other control samples and most reported Mn-based catalysts and comparable to that of commercial Pt/C. When integrated into Zn–air batteries (ZABs), Mn/N-C-2-based ZABs deliver an open-circuit voltage of 1.49 V and a peak power density of 150.51 mW/cm 2 , outperforming benchmark Pt/C-based counterparts. This work offers a cost-effective electrocatalyst for ORR and can be used instead of noble metals in ZABs. Graphical Mn/N-C electrocatalysts are fabricated by a NaCl-assisted pyrolysis strategy. The optimized Mn/N-C-2 catalyst exhibits a large specific surface area, hierarchically porous architecture and high content of active N, presenting an E 1/2 of 0.836 V for ORR. When integrated into ZABs, it delivers an open-circuit voltage of 1.49 V and a peak power density of 150.5 mW/cm 2 .
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Sustainable Energy & Fuels
·
2024
·Vol. 8
·期 4
·826-836
·
IF 5
Jingyi Kong,Hanling Guo,Yuan Li,Min Gong,Xiang Lin,Liang Zhang,Dongrui Wang
Aqueous Zn metal batteries are a promising candidate for low-cost, safe, and sustainable energy storage systems. Nonetheless, the practical application of such batteries is still impeded by the inferior Zn anode performance and instability of the cathode. Herein, we investigate the performance of an aqueous Zn‖LiMn2O4 (Zn‖LMO) hybrid battery with a bi-salt (ZnSO4 and Li2SO4) electrolyte modified with a low dosage of poly(ethylene glycol) (PEG200) and MnSO4. The PEG additive effectively inhibits water decomposition, mitigates Zn metal corrosion, and promotes the in-plane growth of hexagonal Zn flakes. As a result, the reversibility of Zn plating/stripping and the long-term cyclability of the Zn‖LMO hybrid battery can be substantially enhanced in the modified electrolyte. Specifically, in our optimized electrolyte ZL-8% PEG-0.1 Mn, the Zn‖LMO hybrid battery exhibits an initial capacity of 91.2 mA h g−1 and a capacity retention of 50% in 500 cycles at 2C, along with improved coulombic efficiency and self-discharge behavior. This dual-additive strategy can be used to design low-cost, highly reversible, safe, and long-cycling Zn–Li hybrid-ion batteries for practical applications.
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BIOELECTROCHEMISTRY
·
2018
·
IF 3.789
Qiang Yuan,Y. Huang,Debao Liu,Minfang Chen
Biodegradable beta-tricalcium phosphate (β-TCP) particle reinforced magnesium metal matrix composites (Mg-MMC) have attracted increasing interest for application as implant materials . This investigation was conducted to study the effect of cooling rate on the microstructure and corrosion behavior of a biodegradable β-TCP/Mg-Zn-Ca composite. The composite was fabricated under a series of cooling rates using a wedge-shaped casting mold. The microstructure of the composite was examined by optical and scanning electron microscopy, and the corrosion behavior was investigated using an electrochemical workstation and immersion tests in a simulated body fluid (SBF). Faster cooling rates were shown to refine the secondary phase and grain size, and produce a more homogenous microstructure. The refined microstructure resulted in a more uniform distribution of β-TCP particles, which is believed to be beneficial in the formation of a stable and compact corrosion product layer, leading to improved corrosion resistance for the composite.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Nan Hu,Hongyu Qin,Xiangyou Chen,Yanping Huang,Jing Xu,Huibing He
Aqueous zinc-ion batteries (AZIBs) have attracted extensive attention because of their eco-friendliness, intrinsic safety, and high theoretical capacity. Nevertheless, the long-standing Zn anode issues such as dendrite growth, hydrogen evolution, and passivation greatly restrict the further development of AZIBs. Herein, a metal–chelate interphase with high Zn affinity is constructed on the Zn metal surface (TA@Zn) via dipping metallic Zn into a tannic acid (TA) solution to address the aforementioned problems. Benefiting from the abundant hydrophilic and zincophilic phenolic hydroxyl groups of TA molecules, the metal–chelate interphase shows strong attraction for Zn2+ ions, guiding uniform zinc deposition as well as decreasing Zn2+ migration barrier. Therefore, the TA@Zn anode displays an extended lifespan of 850 h at 1 mA cm−2, 1 mAh cm−2 in the Zn|Zn symmetrical cell, and a high Coulombic efficiency of 96.8% in the Zn|Ti asymmetric cell. Furthermore, the Zn|V2O5 full cell using TA@Zn anode delivers an extremely high capacity retention of 95.9% after 750 cycles at 2 A g−1. This simple and effective strategy broadens the interfacial modification scope on Zn metal anodes for advanced rechargeable Zn metal batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chenxu Wang,Zhimou Wang,Jie Yu,Ke Lu,Wentao Bao,Gang Wang,Banghua Peng,Wencai Peng,Feng Yu
MOFs are traditionally synthesized via intermittent synthesis, but its synthesis process is time consuming. Furthermore, many organic solvents used in the synthesis of MOF materials severely pollute the environment. Therefore, in this work, different types of Zn-MOFs were synthesized using a microchannel reactor with various proportions of MeOH and H 2 O as solvents. Unlike the direct mixing method, the microchannel reactor could synthesize Zn-MOF structures under any solvent proportion, and different solvents had a great influence on Zn-MOF morphology. Density functional theory (DFT) calculations were conducted to explain why Zn-MOFs with varied morphologies could be synthesized in different solvents. The calculation results showed that 2-methylimidazole was easier to coordinate with the zinc ions in the MeOH solvent due to its low free energy; thus, it was easier to form three-dimensional structures. However, in the H 2 O solvent, growth stopped due to a sudden increase in free energy in the coordination process, so a two-dimensional structure appeared in the aqueous solution. Finally, Zn-MOFs with more mesoporous structures had better adsorption performance. At 1 atm and 298 K, MOF-FNP-MeOH and MOF-FNP-H 2 O performed the maximum CO 2 adsorption capacity of 3.28 mmol·g −1 and 4.09 mmol·g −1 , respectively.
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ChemistrySelect
·
2026
·Vol. 11
·期 38
·e74780
·
IF 2.3
Yuan Bai,Pengfei Fan,Weiting Huang,Xinyu Gan
A reusable magnetic cellulase (CEL) immobilized composite, MF@CS-LDHs@CEL, was developed by integrating α-FeOOH–Fe 3 O 4 magnetic nanoparticles (MF), chitosan (CS), and zinc–aluminum layered double hydroxides (LDHs) with CEL for the removal of Congo red (CR) from aqueous media. The optimal CEL immobilization conditions were an initial enzyme concentration of 3 mg/mL, a glutaraldehyde concentration of 4%, a cross-linking time of 2 h, an immobilization pH of 5.0, and an immobilization temperature of 50°C. Under optimized operational conditions (50 mL of 100 mg/L CR solution, 50°C, pH 5.0, 300 min reaction time, and 30 mg of adsorbent), the experimental maximum adsorption capacity of MF@CS-LDHs@CEL for CR reached 140.64 mg/g. The material maintained an 87.66% CR removal efficiency even after eight consecutive reuse cycles. The adsorption data were best described by the Redlich–Peterson isotherm ( R 2 = 0.99591) and pseudo-second-order kinetic models ( R 2 > 0.999), suggesting heterogeneous adsorption involving strong adsorbate–surface interactions. The removal of CR was primarily associated with hydrogen bonding, electrostatic interactions, and anion-exchange processes acting in combination. In addition, MF@CS-LDHs@CEL exhibited favorable adsorption performance, convenient magnetic separation, and good reusability, demonstrating its potential as an adsorbent for treating dye-containing wastewater. Graphical A recyclable magnetic cellulase composite, MF@CS-LDHs@CEL, is developed for Congo red (CR) removal from wastewater. It reaches an adsorption capacity of 140.64 mg/g and retains 87.66% removal after eight reuse cycles. CR uptake is mainly associated with hydrogen bonding, electrostatic interactions, and anion exchange, while magnetic separation allows straightforward recovery and reuse.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Fuyu Jiang,Peilin Liu,Yuhang Liu,Xi Chen,Jian Li,Yiyang Bi,Yuchun Wan,Wanqiang Liu
A hydrogen-bond-regulated PVA/CMC quasi-solid-state electrolyte with EG/H 2 O solvent was designed to realize antifreezing and dendrite-free aqueous Zn-ion batteries. • The synergistic polymer network and EG effectively reduced free-water activity, optimized Zn 2+ solvation, and enabled uniform Zn deposition. • COMSOL simulations and experimental analyses confirmed that the quasi-solid-state electrolyte homogenized the interfacial electric field and suppressed dendrite growth. • The Zn||Zn symmetric cell achieved a long cycling lifespan of 1100 h at room temperature and 1700 h at −30 °C. Aqueous zinc-ion batteries (AZIBs) have attracted extensive attention owing to their intrinsic safety, low cost, and environmental benignity. However, the practical application of AZIBs is severely hindered by the freezing of aqueous electrolytes at low temperatures and by uncontrolled Zn 2+ deposition, which induces dendrite growth. Herein, a freeze-resistant quasi-solid-state gel electrolyte is proposed, in which poly (vinyl alcohol) (PVA) and carboxymethyl cellulose (CMC) form a robust three-dimensional network via hydrogen bonding and chain entanglement. Ethylene glycol (EG) regulates the solvation environment by confining free water molecules, thereby depressing the freezing point and stabilizing the Zn 2+ solvation structure, enabling efficient ion transport at low temperatures. COMSOL Multiphysics (COMSOL) further confirms that the quasi-solid-state electrolyte effectively homogenizes the electric field distribution, suppresses dendrite growth, and mitigates interfacial corrosion. Benefiting from these synergistic effects, Zn||Zn symmetric batteries deliver a prolonged cycling lifespan of 1100 h at 1 mA cm –2 and 1 mAh cm –2 , which is 12 times longer than that of the ZnCl 2 electrolyte. Notably, an ultralong lifespan of 1700 h is achieved at -30 °C. Furthermore, the Zn||V 2 O 5 full cell exhibits outstanding cycling stability over 2000 cycles at 1 A g –1 . This work provides a promising strategy for designing antifreezing electrolytes and stabilizing Zn anodes for high-performance AZIBs under extreme conditions. Download: Download high-res image (278KB) Download: Download full-size image
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Nature Communications
·
2026
·
IF 18.1
Ren Lijuan,Hu Xiuli,Wang Shuyu,Shi Jiaqi,Gong Jiaxing,Wang Manyun,Zhou Ji,Wang Jianzu,Lv Xian-Wei,Bielawski Christopher W.,Geng Jianxin
Zinc−air batteries are promising devices for use in safe and cost-effective energy storage applications. However, their practical utility is hindered by sluggish oxygen evolution and oxygen reduction reactions. We show that hybridizing electronically coupled Co single atoms and a CoPd alloy within a three-dimensional macroporous N-doped carbon (CoPd/Co@3D NC) enables high-performance N 2 H 4 -assisted zinc−air batteries, where the oxygen evolution reaction is replaced with the thermodynamically more favorable hydrazine oxidation reaction. Experimental and theoretical data reveal that electronic coupling between the Co single atoms and the CoPd alloy mutually modifies their electronic structures, which, in turn, weakens oxygen adsorption on the Co single atoms and enhances N 2 H 4 adsorption on the Pd sites. The electronic-coupling effect accelerates the rate-limiting steps of the oxygen evolution and hydrazine oxidation reactions. Consequently, N 2 H 4 -assisted zinc−air batteries employing CoPd/Co@3D NC exhibit a small charging/discharging voltage gap of 0.52 V at 100 mA cm −2 , a peak specific power of 151 mW cm −2 , and a specific capacity of 810 mAh g −1 at 10 mA cm −2 ; these values are competitive when compared to those exhibited by conventional zinc−air batteries.
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Asian Journal of Organic Chemistry
·
2026
·Vol. 15
·期 7
·e70484
·
IF 2.3
Yuwan Yang,Jinhong Xiao,Zhenfeng Feng,Chunyan Deng,Yongjian Qiu,Shuman Chang,Yanxiu Zheng,Lin Lei,Yaju Chen
The integration of CO 2 capture and conversion into a single heterogeneous catalyst represents a pivotal step toward sustainable carbon resource utilization. Herein, we report a facile synthesis of porous hyper-crosslinked polymers (Salen(Zn)-iHCP) containing salen(Zn) complex and multi-ionic sites via a one-pot Friedel–Crafts alkylation and quaternization strategy. This strategy elegantly overcomes the porosity limitations typically encountered during direct polymerization of charged ionic monomers. The resulting Salen(Zn)-iHCP features a high specific surface area, good CO 2 -selective affinity, and a uniform distribution of proximal Lewis acidic Zn(II) centers and nucleophilic Br − sites. Owing to the synergistic effect between the Zn and Br − sites, coupled with a good CO 2 adsorption capacity, Salen(Zn)-iHCP exhibits high catalytic activity for the cycloaddition of CO 2 with various epoxides in the absence of any additives and solvents. At 100°C and 1.0 MPa, Salen(Zn)-iHCP2 achieves 99% conversion of epichlorohydrin with 97% yield of corresponding cyclic carbonate. Notably, Salen(Zn)-iHCP2 maintains high activity even using simulated flue gas (15% CO 2 in 85% N 2 ) as the carbon source and demonstrates robust recyclability over five cycles. This work provides a promising strategy for constructing high‑performance heterogeneous catalysts for integrated CO 2 capture and conversion.
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Journal of Materials Chemistry A
·
2026
·
IF 9.2
Xue Liu,Miao Wang,Dongyang Xie,Hongyan Zhuo,Wenmiao Chen,Yuexing Zhang,Yanli Chen
As a promising energy storage technology, zinc-air/iodide hybrid batteries (ZAIHBs) require efficient bifunctional catalysts capable of simultaneously mediating both oxygen reduction reaction (ORR) and iodide oxidation reaction (IOR). Herein, we demonstrate a spin-orbital and hybridized energy level strategy by constructing heteroatom-doped carbon nanotube-supported iron phthalocyanine polymers (S/N-CNT@PFePc). Zero-field cooling (ZFC) measurements reveal that both S and N-doping on the axial position induces a spin-state transition from low-spin to intermediate-spin in the Fe centers, stemming from the broken symmetry of crystal field. Moreover, density functional theory (DFT) calculations justify that axial S coordination causing a closer energy level between the intermediates (*OH and *I) and Fe 3dz2 orbital, enabling promoted electron transfer compared to N-doping. As a result, the spin-orbital regulation in S-CNT@PFePc achieved a record-low charge–discharge voltage gap ORR-IOR potential gap of 0.34 V (ΔE = Ej=10IOR- E1/2ORR). Impressively, when implemented in ZAIHBs, the S-CNT@PFePc-based cathode delivers an exceptional energy efficiency of 70% with remarkable stability, retaining 66% efficiency after 500 hours - among the best performances reported for hybrid battery systems. Furthermore, the flexible solid-state ZAIHBs incorporating this catalyst demonstrate excellent mechanical robustness and cycling stability, underscoring their practical applicability.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Shuhan Chen,Jichang Sun,Pengyu Meng,Liansheng Li,Qinghua Liang
Aqueous zinc ion hybrid capacitors (ZIHCs) typically pair a battery-type Zn anode with a capacitor-type porous carbon cathode. Their capacity is conventionally thought to be limited by the intrinsic electric double-layer (EDL) capacitance and pseudocapacitance arising from the porous structure and surface chemistry of the cathode. This longstanding view has constrained the achievable energy density of ZIHCs. In this work, we challenge this paradigm by demonstrating that charging at high voltage substantially enhances the capacity of commercial cathodes in a 2 M ZnSO 4 electrolyte. Leveraging this insight, we develop two simple strategies to significantly increase the energy density of ZIHCs. An ex situ approach nearly doubles the capacity of a commercial cathode, yielding an order of magnitude increase in the specific energy E total based on the total active mass of anode and cathode when integrated into a Zn-limited configuration. Alternatively, an in situ strategy, which directly charges the device to a high voltage, achieves comparable enhancement while simplifying fabrication. Both strategies deliver exceptional cycling stability (over 60,000 cycles at 5.0 A g −1 ) and are successfully validated in pouch cell prototypes. Overall, this work provides a deeper mechanistic understanding and offers simple, low-cost routes to high-energy-density aqueous ZIHCs.
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ADVANCED POWDER TECHNOLOGY
·
2026
·Vol. 37
·期 9
·105408
·
IF 4.5
Xiaoying Huang,Mingliang Xiang,Xiao Jin,Min Nie,Wei Xu,Rie Umetsu,Qing Yang,Yanan Chen,Jun-Qiang Wang,Yan Zhang
With the rapid advancement of power electronics toward high-frequency and miniaturization, there is an urgent demand for soft magnetic composites (SMCs) that possess both high permeability and low core loss. Herein, a novel Cr-O&(Ni,Zn)Fe 2 O 4 synergistic hybrid insulation was synthesized on FeSiBCCr amorphous powders via sequential hydrothermal and chemical co-precipitation methods. The oxygen partial pressure during annealing was optimized using 0.8 wt.% carbon powder to enhance the crystallinity and magnetic properties of the ferrite insulating coating. The resulting SMCs exhibited a saturation magnetization ( M s ) of 140.0 emu/g and an effective permeability ( μ e ) of 35.03. Notably, the core loss P 50mT/1MHz was reduced to 2143.10 mW/cm 3 , which is 50.72% lower than that of the core sample prepared by using raw powder without ferrite insulating coating. This synergistic hybrid insulation effectively suppresses inter-particle eddy currents and reduces domain wall pinning, offering a high-performance solution for high-frequency power electronics.
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