ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Kui Yan,Ruixin Chen,Qi Ling,Ziwei Zhao,Zihan Zhou,Xuan Li,Jianguo Lv,Chunbin Cao,Gang He,Zhaoqi Sun,Miao Zhang
This research presents an innovative approach to the in-situ fabrication of Mn-doped NiFe 2 O 4 (Mn-NiFe 2 O 4 ) nanosheet arrays directly on nickel foam substrates. The formation of precursors on the nickel foam substrates is achieved through spontaneous corrosion, followed by a thermal treatment to form the Mn-NiFe 2 O 4 nanosheet arrays. The material's structure and morphology were thoroughly examined, revealing that the addition of Mn transforms the nanoporous structure on the nickel foam into a nanosheet structure. The average thickness of the nanosheets is 30 nm, and their primary composition is Mn-doped NiFe 2 O 4 . The resulting highly porous structure of these nanosheets provides numerous active sites and effective electron and ion diffusion channels, thereby increasing charge density and mechanical stability. Electrochemical assays show that the areal-specific capacity of the synthesized electrode material reaches 4.34 C cm −2 (areal-specific capacitance is 8.68 F cm −2 ) at 1 mA cm −2 . Notably, the constructed hybrid supercapacitor achieves a power density of 544 µW cm −2 at an energy density of 390 µWh cm −2 . Furthermore, capacitance retention is 95.2% after 5000 charging cycles. Additionally, the assembled device delivers robust and sustained energy output for LED displays and electric toy cars. This method streamlines the production flow of electrode materials, reducing energy consumption while significantly enhancing the areal capacitance of supercapacitors. The assembled hybrid supercapacitor structure diagram and the assembled devices provide power sources for electric toy cars and LED displays.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Maolin Yang,Tingting Yang,Mingjie Dong,Zhongyuan Huang,Yuguang Pu,Lei Jin,Rui Wang,Yuxi Luo,Tao Zeng,Yonglin Tang,Jun Chen,Rafal E. Dunin-Borkowski,Ziwei Chen,Yu Qiao,Yinguo Xiao
Mn-rich layered oxides (MRLOs) are promising low-cost cathode materials for sustainable sodium-ion batteries (SIBs). However, the low Mn 4+ /Mn 3+ redox potential limits their energy densities, and the Jahn-Teller distortion that occurs surrounding Mn 3+ at low voltages destabilizes the structure. Additionally, complex ordered structures inherently present in MRLOs hinder Na + migration. In this study, new types of cation ordering structures are discovered in common MRLOs. By regulating oxygen vacancy formation, the transition from short-range to long-range cation ordering is disrupted, effectively mitigating cooperative Jahn-Teller distortion and achieving a 95.3% capacity retention over 1 000 cycles at 8 C. The maximum entropy method (MEM) analysis is performed based on neutron diffraction data, which visualizes significantly optimized Na + diffusion pathways in long-range disordered cathode with enhanced Na + diffusion kinetics. Furthermore, the formation of oxygen vacancy elevates the Mn 4+ /Mn 3+ redox potential, resulting in a competitive energy density of 626 Wh kg −1 within 1.5–4.5 V in a half-cell configuration. This work offers a multiscale approach to precise elucidation of the cathode crystal structure and provides a feasible pathway to optimize sodium-ion cathodes by disrupting long-range cation ordering, ultimately facilitating substantial improvements in electrochemical performance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xingjie Lu,Jie Liu,Jiayi Chen,Wenjing Wang,Bingrui Ma,Wenxiang Xia,Yizhen Tang
Cu-Mn electronic coupling stabilizes spinel manganese ion sieves. • Cu doping reduces first-cycle Mn dissolution from 3.33% to 0.21%. • Cu-HMO retains 96.8% of lithium uptake after ten regeneration cycles. • Cu substitution raises Mn-vacancy formation energy by 0.403 eV. • Cu doping strengthens lithium binding from −3.515 to −4.556 eV. Manganese-based lithium ion sieves suffer from Mn dissolution and structural degradation during acid regeneration. Herein, Cu-doped HMO (Cu-HMO) was developed to simultaneously enhance Li + adsorption and structural stability. Cu incorporation preserved the spinel Mn O framework while increasing the specific surface area and regulating the Mn valence distribution. XPS revealed decreased Mn 3+ and increased Mn 4+ fractions accompanied by low-valence Cu species, indicating Cu Mn electronic coupling that suppresses Jahn-Teller distortion and Mn 3+ disproportionation. Cu-HMO exhibited a maximum Li + adsorption capacity of 49.15 mg/g at 298 K and maintained superior performance in the presence of various competing ions. During ten adsorption-desorption cycles, Cu-HMO exhibited improved capacity retention and markedly reduced Mn dissolution, with the first-cycle Mn dissolution rate decreasing from 3.33% for HMO to only 0.21% for Cu-HMO, corresponding to a reduction of approximately 94%. Density functional theory (DFT) calculations showed that Cu substitution increased the Mn-vacancy formation energy by 0.403 eV and strengthened Li adsorption from −3.515 to −4.556 eV. These results demonstrate that Cu-induced electronic regulation provides an effective strategy for constructing stable and selective manganese ion sieves. Download: Download high-res image (208KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Boyan Fu,Yunzhi Kang,Baixi Xia,Hongji Liu
The detection of H 2 S, a highly toxic and corrosive gas prevalent in industrial processes, is imperative for safety and environmental monitoring. This necessitates the development of sensors exhibiting excellent sensitivity, quick response/recovery time, and superior selectivity. In this work, hollow and porous nanowires were fabricated via an ultrasound-assisted electrospinning method. By synergistically combining A-site deficiency engineering and B-site doping, a sensing material with high specific surface area and increased surface-adsorbed oxygen was achieved at a Mn doping level of 0.2. Operating at 130 °C, the gas-sensing material displays a high response of 113.5 toward 100 ppm H 2 S, approximately 15 times greater than that of pure LaFeO 3 along with rapid response/recovery time, respectively. The sensor also exhibits outstanding repeatability, selectivity, long-term stability, and humidity resistance. Moreover, it maintains remarkable sensing performance even at temperatures as high as 500 °C, indicating its potential for applications across a broad temperature range. Combined with theoretical calculations and experimental studies, the superior gas-sensing properties originate primarily from the synergistic effect between the nonstoichiometric behavior induced by A-site defects and the lattice distortion along with the increased active sites resulting from B-site doping. These findings pave the way for developing high-performance H 2 S sensing materials.
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CHEMICAL ENGINEERING & TECHNOLOGY
·
2026
·Vol. 49
·期 2
·e70167
·
IF 1.6
Jing Peng,Yin Huang,Haoran Lei,Xiuhua Wang
We successfully engineered a cactus-like Co 2 P nanocatalyst for overall water splitting by incorporating manganese to modulate its electronic structure. Incorporating Mn into Co 2 P enhances both HER and OER through optimized surface adsorption, leading to faster kinetics and improved catalytic efficiency. The Mn-Co 2 P catalyst delivers outstanding alkaline HER performance, requiring just 51 mV to drive 10 mA cm −2 while showing no degradation during a 48-h stability test. Notably, the OER overpotential is just 283 mV at 50 mA cm −2 with remarkable durability. Remarkably, when utilized as dual-function electrodes in a complete water electrolysis system, the Mn-Co 2 P-based system delivers 10 mA cm −2 at a low cell voltage of 1.523 V, along with brilliant long-term stability.
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高影响因子
LANGMUIR
·
2026
·
IF 4.4
Chao Ge,Yunlan Gu,Bin He,Yanqing Wang,Yawen Tang,Tongfei Li
The advancement of catalysts that are both platinum-group-metal (PGM)-free and iron-free is essential for the oxygen reduction reaction (ORR), which is kinetically slow, particularly in anion-exchange membrane fuel cells (AEMFCs). One of the primary obstacles lies in achieving adequate activity and stability within the membrane electrode assembly (MEA) under real-world hydrogen-air operating conditions. Herein, an effective MnN4 site encased within N-doped carbon nanofibers (denoted as MnN4@N-CNFs) is designed for efficient ORR electrocatalysis. Benefiting from the electronic structure modulation of MnN4 moieties through strong interfacial coupling with the carbon matrix, and structural advantages of the 3D hierarchical porosity synergizing with N-doped carbon-MnN4 coordination systems, the as-resultant MnN4@N-CNFs demonstrate a high half-wave potential of 0.89 V, outstanding durability, and impressive methanol tolerance under alkaline environments, outperforming commercial Pt/C and a diversity of reported counterparts. Notably, the engineered catalyst demonstrates remarkable fuel cell performance with a peak power density of 222.0 mW cm–2 during practical AEMFC operation, while maintaining stable operation for over 15 h, representing a 3-fold enhancement over conventional Pt/C-based counterparts. This study establishes fundamental design principles for high-efficiency AEMFCs through atomic-level engineering of precisely coordinated metal–N–C active sites, providing a robust framework for next-generation electrocatalyst development.
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高影响因子
Materials
·
2026
·Vol. 19
·期 7
·1370
·
IF 3.7
Yi Luo,Nan Li,Lingjing Yang,Jinlong Wei,Yuantao Yang,Wentao Wang,Yang Zhao,Ruidong Xu,Xuanbing Wang
The high energy consumption of lead anodes in zinc production is caused by the slow oxygen evolution reaction (OER). We made a La-Mn co-doped β-PbO2anode using electrodeposition to solve this issue. The XRD and XPS results show that adding La shrinks the lattice and changes the electron structure. This helps Mn4+change into active Mn3+and creates more active oxygen on the surface, making the reaction easier. EIS tests show that the charge transfer resistance (Rct) decreased by 4.2 times, decreasing from 147.6 Ω to 34.72 Ω at 1.0 V. The Bode phase peak also moved to a lower frequency (from 122 Hz to 0.215 Hz), proving that the electrochemically active surface area (ECSA) increased significantly. At the industrial current of 50 mA cm−2, the anode shows a low overpotential of 840 mV and a Tafel slope of 265 mV dec−1. This improved performance saves 187.10 kWh of energy per ton of zinc. Therefore, the LaMn-β-PbO2anode is a promising and energy-saving option for industrial zinc production.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122002
·
IF 7.5
Qian Zhang,Shiyun Xu,Qingjun Fan,Jiaojiao Zhang,Xiaofeng Zhou,Tianran Sheng,Fuying Hao,Liangquan Sheng,Zhaodi Liu,Huajie Xu
Lattice strain is commonly acknowledged as an effective strategy for tuning the catalytic activity of transition metals, yet its direct impact on Fenton-like reactions remains not fully understood. Herein, we introduce compressive strain into CoMn 2 O 4 via thermal expansion effects in conjunction with a component regulation strategy to enhance peroxymonosulfate (PMS)-based Fenton-like activation. Structural analysis reveals that the compressively strained features enhance metal-oxygen bond coupling and induces the formation of a substantial amount of oxygen vacancies, which promote PMS adsorption and interfacial charge transfer. The obtained CoMn 2 O 4 (2:1)/PMS system demonstrates efficient and stable removal of organic pollutants via dominant nonradical pathways ( 1 O 2 ), and the reaction kinetics was enhanced from 0.078 min −1 to 0.264 min −1 , and the removal rate for sulfadiazine (SD) was as high as 99.8% within 30 min after five cycles. Furthermore, the remarkable feasibility of the CoMn 2 O 4 (2:1)/PMS system for practical wastewater treatment in real river water and pharmaceutical effluents was demonstrated, particularly through the development of a catalytic membrane filtration system and an in-situ floating water treatment device. This study offers new insights into the design of high-performance PMS activation catalysts via lattice strain engineering.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Ye Qian,Yimeng Zhu,Shiyin Zhao,Jiarui Du,Yang Bai,Songjian Zhao,Xin Min
Chlorine species represent a major challenge for the catalytic oxidation of chlorine-containing volatile organic compounds (CVOCs) such as chlorobenzene (CB) because they readily deactivate catalysts. However, the underlying deactivation pathway remains incompletely understood, leaving a clear knowledge gap. Elucidating this pathway is therefore crucial for the rational optimization of CVOCs oxidation technologies. In this work, the structure-activity relationships of fresh MnO 2 , chlorine-poisoned MnO 2 -Cl, and regenerated MnO 2 -Cl-R were systematically investigated by integrating catalytic performance tests and kinetic analysis with comprehensive physicochemical characterization. The results show that chlorine species deteriorate the structural integrity of MnO 2 and disrupt the uniformity of elemental distribution through physical aggregation and chemical interactions, thereby reducing the accessibility and exposure of active sites. Mechanistically, during CB oxidation, chlorine poisoning decreases Mn dispersion and the ordering of oxygen species and lowers the fraction of high-valence Mn, collectively weakening the intrinsic oxidative capability of the active sites and causing performance loss. Regeneration removes a portion of surface chlorine deposits, alleviates manganese aggregation, and partially restores lattice‑oxygen participation, leading to an activity level between those of the fresh and poisoned catalysts. Nevertheless, complete recovery is not achieved: the stability of Mn Cl bonding, coupled with limitations arising from side reactions during regeneration, prevents full removal of chemically bound chlorine and leaves residual poisoning. Overall, this study clarifies the chlorine-poisoning pathway on MnO 2 and provides guidance for designing chlorine-tolerant catalysts and optimizing CVOCs catalytic oxidation processes.
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高影响因子
Journal of Energy Storage
·
2026
·
IF 10.7
Yang Wang,Jing Wang,Jiahuan Luo,Chuanhao Luo,Xu Deng,Ying Liu,Huihui Zhao,Jiayi Ren,Yubiao Xu,Shaojie Zhu,Wanting Shi,Zhenjun Liu,Hao Liu,Rui Hao,Ning Fu
Aqueous zinc‑iodine batteries (AZIBs) are considered promising candidates for large-scale energy storage owing to their high theoretical energy density and intrinsic safety. However, the practical performance is severely limited by sluggish I 2 redox kinetics and the shuttle effect of soluble polyiodide. In this work, a curvature engineering strategy is developed for Mn-N 4 single-atom sites, in which the introduction of C I bonds induces a surface-contracted structure, leading to the formation of a Mn-NC-I configuration. This structural modulation breaks the geometric symmetry of the Mn-N 4 sites and redistributes the local electronic density, enabling directional halogen-bond interactions with polyiodide. As a result, I 2 are effectively anchored, polyiodide shuttling is suppressed, and the I 3 − /I − conversion kinetics are significantly accelerated. Benefiting from enhanced I 2 confinement, and catalytically active Mn centers, the Mn-NC-I/I 2 cathode delivers a high reversible capacity of 148.4 mAh g −1 at 0.1 A g −1 , excellent rate capability, and an ultralow capacity decay rate of 0.0016% per cycle over 20,000 cycles at 10 A g −1 . This study elucidates the critical role of curvature engineering in regulating Mn-N 4 mediated I 2 redox chemistry and provides a viable design principle for high-performance single-atom catalysts in AZIBs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Yuqin Jia,Zhiguo Cai,Haifeng Weng,Yulong Zhao,Zhongtian Zeng,Shilong Han,Lei Zhu,Fanguang Zeng,Yihan Ling,Xiaoyan Cai,Liang Mao
Spin engineering via Mn doping precisely steers Co spin state in NiCo 2 O 4 , beyond the conventional d-band center regulation. • Mn-NCO exhibits a low overpotential of 265 mV at 10 mA cm -2 and outstanding durability over 500 h in alkaline electrolyte. • Mn acts as a spin switch to optimize *O adsorption, lowering rate‑limiting barrier from 2.84 to 1.64 eV. • Practical potential is demonstrated via a stable AEM water electrolyzer, bridging fundamental research and application. While regulating the d -band center is a widely adopted strategy for optimizing oxygen evolution reaction (OER) electrocatalysts, it often lacks the precision required for selectively lowering the high energy barrier of the rate-determining step (e.g., *O → *OOH). This work introduces a spin engineering approach via manganese (Mn) doping to effectively tailor the electronic structure of NiCo 2 O 4 (NCO). The Mn-doped NCO porous microspheres, synthesized through a facile solvothermal-oxidation route, deliver outstanding OER performance in 1.0 M KOH, requiring an overpotential of only 265 mV to achieve 10 mA cm −2 current density and maintaining exceptional stability for 500 h. Moreover, the catalyst shows great promise in an anion exchange membrane water electrolyzer. Density functional theory calculations disclose that Mn serves as a “spin switch”, promoting a transition of Co active sites from high-spin (magnetic moment ∼2.4 μB) to low-spin (∼1.9 μB) states. This spin-state modulation selectively weakens the adsorption of the critical *O intermediate, thereby markedly reducing the energy barrier of the rate-determining step from 2.84 eV to 1.64 eV, without significantly perturbing other intermediates. This work not only reports a highly active OER electrocatalyst but also illuminates the pivotal role of spin-state manipulation, offering a new paradigm for designing high-performance electrocatalytic materials. Mn doping serves as a spin switch in NiCo 2 O 4 electrocatalyst, modulating the active Co site from high spin to low spin state to optimize *O adsorption and significantly lower the rate-determining step energy barrier from 2.84 to 1.64 eV. Download: Download high-res image (244KB) Download: Download full-size image
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Ning-Ya Wang,Yi-Hong Liu,Xiao-Jie Jiang,Hui-Li Guo,Li-Xiao Wang,Bei-Bei Li,Xue Liu,Xiao-Bo Zheng,Jing-Yu Pang,Dong-Bin Dang,Yan Bai
The catalytic activity of single-atom catalysts (SACs) is strongly influenced by their local coordination environment. In this study, a series of Mn-N-C SACs with tunable coordination structures were synthesized via pyrolysis of Mn-doped metal-organic frameworks (MOFs) at different temperatures. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption spectroscopy (XANES and EXAFS) confirmed the atomic dispersion of Mn and the formation of Mn-N 4 moieties as the active sites. Among the catalysts, Mn-NC-1000°C with high Pyridine-N content exhibited the best performance, achieving a maximum Faradaic efficiency (FE) of 94.9% for CO at –0.47 V vs. RHE in an H-type cell, along with a current density of ∼15 mA . cm −2 . And in a flow cell, the current density increased significantly to ∼100 mA . cm −2 while maintaining high CO selectivity (FE CO =95%) and operational stability (24 h). The density functional theory (DFT) studies further reveal that the Mn-NC-1000°C with high Pyridine-N content effectively reduces the reaction barriers for the formation of *COOH and thus accelerates the reduction of CO 2 .This work provides a controllable strategy for regulating the coordination microenvironment of SACs and offers valuable insights for the development of efficient CO 2 electroreduction system.
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