Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Wang Dawei,Lin Fangxu,Luo Heng,Zhou Jinhui,Zhang Wenshu,Li Lu,Wei Yi,Zhang Qinghua,Gu Lin,Wang Yanfei,Luo Mingchuan,Lv Fan,Guo Shaojun
Using metal oxides to disperse iridium (Ir) in the anode layer proves effective for lowering Ir loading in proton exchange membrane water electrolyzers (PEMWE). However, the reported low-Ir-based catalysts still suffer from unsatisfying electrolytic efficiency and durability under practical industrial working conditions, mainly due to insufficient catalytic activity and mass transport in the catalyst layer. Herein we report a class of porous heterogeneous nanosheet catalyst with abundant Ir-O-Mn bonds, achieving a notable mass activity of 4 A mg Ir −1 for oxygen evolution reaction at an overpotential of 300 mV, which is 150.6 times higher than that of commercial IrO 2 . Ir-O-Mn bonds are unraveled to serve as efficient charge-transfer channels between in-situ electrochemically-formed IrO x clusters and MnO x matrix, fostering the generation and stabilization of highly active Ir 3+ species. Notably, Ir/MnO x -based PEMWE demonstrates comparable performance under 10-fold lower Ir loading (0.2 mg Ir cm −2 ), taking a low cell voltage of 1.63 V to deliver 1 A cm −2 for over 300 h, which positions it among the elite of low Ir-based PEMWEs.
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高影响因子
FUEL
·
2025
·
IF 7.5
Yan Tan,Xiao Liu,Yujia Zhang,Yiyang Rong,Xueying Wu,Ting Liu,Zizhen Ma,Huawei Zhang
In the current study, catalytic oxidation technology is among the most widely used methods for removing chlorinated volatile organic compounds (CVOCs). This article details the preparation of the Ag-Mn@ZSM-5 catalyst, which was prepared via the hydrothermal approach, followed by the incorporation of nano-Ag. The focus of the study is the catalytic oxidation of chlorobenzene (CB). Experimental results indicate that the hydrothermally synthesized nano-silver modified Ag-Mn@ZSM-5 catalyst, exhibiting a T90 of 290 °C, demonstrates superior performance compared to the Ag-Mn/ZSM-5 catalyst prepared via the traditional impregnation method, which has a T90 of 365 °C. As the operating airspeed increased from 7000 h −1 to 42000 h −1 , the removal efficiency of CB consistently remained above 90%, with stability maintained over a duration of 30 h. Furthermore, the catalyst exhibited excellent water resistance during a 12 h switching water test. Based on the characterization results, after loading Ag, the ratio of Mn 4+ and Mn 3+ on the surface of the Ag-Mn@ZSM-5 catalyst increases, the reducibility is enhanced, and the surface adsorbed oxygen species is increased, which is conducive to improving the catalytic activity. In addition, the Ag-Mn@ZSM-5 catalyst possesses an optimal pore structure, the proportion of mesoporous is 79.06%, suitable redox capacity, abundant acidic sites, and features a compact crystal stacking structure, which results in remarkable stability, catalytic activity, and space velocity resistance of the catalyst. These advantageous properties facilitate the adsorption and deep oxidation of CB. This study presents promising prospects for industrial applications and aims to offer innovative strategies for the treatment of chlorine-containing waste gases.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Yunqin Yang,QiuMing Liang,Tianwei Lei,Huan He,Tianquan Liang
The capacity of Co-free Li-rich Mn-based layered oxide decreases rapidly due to the irreversible lattice oxygen lose and the crystal structure change. The sodium modified cathode materials are synthesized via the sol–gel method and the electrochemical properties are investigated. Specifically, the first discharge capacity of Li 1.18 Na 0.02 Mn 0.54 Ni 0.26 O 2 is 150.5 mAh·g −1 at 2C, demonstrating a capacity preservation rate of 94.1 % after 100 cycles. And the diffusion coefficient of Li 1.18 Na 0.02 Mn 0.54 Ni 0.26 O 2 is 1.2152 × 10 -15 , which is better than 1.3798 × 10 -16 of the undoped material. This work demonstrates that appropriate Na + doping can stabilize the crystal structure, increase the lithium layer spacing and reduce the irrevocable escape of lattice oxygen within material.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruonan Guo,Zenghui Bi,Beidou Xi,Changsheng Guo,Heng Zhang,Ningqing Lv,Guangzhi Hu,Jian Xu
The function of heterogeneous catalyst in singlet oxygen ( 1 O 2 ) generation under acidic and neutral conditions and the effect of sulfate radical on the generation of 1 O 2 is still unclear. This study provided a novel generation pathway of 1 O 2 in the heterogeneous Mn single − atom catalyst (Mn SAC)/peroxymonosulfate (PMS) system. The MnN4 site with the ideal binding strength promoted the activation of PMS to generate sulfate radical (SO 4 •– ), which would be adsorbed on the carbon/nitrogen sites forming SO 4 •– (s) , reacting spontaneously to produce 1 O 2 . The presence of MnN4 and carbon/nitrogen structure sites could shift the oxidation process from a bulk–phase oxidation to a surface oxidation. This shift has important implications in terms of reaction rate and product distribution, as the dual reaction sites decrease the required migration distance for the active species to form 1 O 2 , avoiding the pointless consumption of active substances.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qibin Zhu,Long Chen,Yun Da
The Calcium looping thermochemical reaction directly driven by solar energy effectively addresses the problem of efficient energy storage of concentrated solar power plants (CSP) by shortening the energy conversion path. But new requirements are put forward for energy storage materials, including high solar radiation absorption, high cycling stability and fast kinetics. To meet these challenges, we have designed porous microsphere structures for the purpose of enhancing mass transfer and the capture of solar radiation. Additionally, Zr and Mn oxides with elevated Tammann temperatures were incorporated to stabilize the morphology and prevent sintering. The synthesized porous microspheres retained abundant mesoporous channels on the surface even after undergoing 20 cycles. The addition of Mn oxide significantly enhances solar spectral absorptivity, achieving an impressive 82.88 % absorbance. The incorporation of Mn and Zr oxides increased the sintering resistance, specific surface area and porosity of CaO/CaCO 3 , especially in the 10–100 nm range, which accelerated the CO 2 transport during carbonation. These enhancements significantly improve the chemical control stage of the carbonation reaction, as further supported by kinetic models. After 50 cycle experiments at 800 °C, the energy storage density of the sample remains at 1074 kJ/kg, which is 1.86 times that of the undoped CaCO 3 . This study provides a new way to design CaCO 3 materials suitable for CSP applications.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 36
·16000-16007
·
IF 2.7
Yao-Xing Han,Renagul Abdurahman,Yue Zhang,Shi-Ji Liu,Xiu-Zhen Yang,Xuan-He Guo,Rui Zhang,Xing-Hong Pan,Xue-Bo Yin
Copper in vegetables can enter the human body, and excessive copper may cause uncomfortable symptoms; thus, it is urgent to test copper ions for safety concerns. Herein, we prepared Zn2GeO4:Mn2+,In3+ (ZGO:Mn,In) persistent luminescent nanoparticles (PLNPs) and then grafted glutathione for the determination of copper ions. ZGO:Mn,In was prepared by doping In3+ in ZGO:Mn to improve the emission at 532 nm under excitation at 258 nm. The doping amount, temperature, time, and pH were carefully optimized for a stronger emission intensity than ZGO:Mn. The fractional densities and energy band gaps were calculated by density functional theory, revealing the excitation enhancement mechanism of ZGO:Mn,In. The surface of ZGO:Mn,In was modified with carboxyl groups for linking glutathione to specially identify Cu2+ ions. The identification resulted in the aggregation-induced quenching of PLNPs’ emission. Thus, the sensor exhibited good selectivity for copper ions, and the composite was successfully applied to the detection of copper ions in serum and vegetable samples.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ziming Wang,Fangbing Liu,Dongyu Pei,Hanbo Wang,Sheng Wan,Yan Wang,Mingrui Yu,Kechang Li,Haiyan Lu
As environmental and carbon emission issues become increasingly severe, electrochemical energy storage systems have gained attention. Compared to traditional supercapacitors, zinc-ion hybrid capacitors (ZIHCs) are not only environmentally friendly but also cost-effective. MnO 2 , with its low cost, eco-friendliness, high theoretical capacity, and stable crystal structure, is considered a promising positive electrode material. In this study, the morphology of MnO 2 was optimized using electrodeposition. During cycling, zinc ions reversibly intercalate and extract from MnO 2 , forming a cactus-like nanoflower structure. This structure is loose and porous, providing ample reaction space for active materials. The assembled device exhibits excellent performance in both energy density (85.68 Wh kg −1 ) and stability (91.60 %).
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Peng Zhao,Jingwei Liu,Wei Zhu,Jie Meng,Zhuang Li,Jinwei Qin,Xiaohui Wang,Haiqin Wan,Chao Yao,Lin Dong
Catalytic combustion is one of effective ways to remove short-chain alkanes. In this study, we elaborately designed a novel catalyst of in situ Co-Mn decorated LaMnO 3 perovskite for ethane catalytic combustion, in which extra Mn and Co species were introduced via acidic KMnO 4 and Co(NO 3 ) 2 solution precipitation method. The addition of Mn and Co could not only slightly etch LaMnO 3 , thereby increasing specific surface area and redox property, but also generate new active phase CoMn 2 O 4 , thus accelerating reaction. Among all the as-prepared catalysts, CMO/LMO-0.5 exhibited admirable ethane removal efficiency with a T 90 of 365 °C, a reaction rate of 0.46 mmol·g −1 ·h −1 , a TOF value of 0.64 mmol·g −1 ·h −1 , and excellent hydrothermal stability and reusability. Moreover, according to in situ DRIFTS, a possible pathway was proposed. This work can rationalize an alternative approach to develop an active catalyst for short-chain alkanes catalytic combustion or other catalytic systems.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Tian Tian,Peixin Zhu,Chun He,Ya Xiong,Jingyun Fang,Shuanghong Tian
As initial and important reactive species, surface O 3 complexes are rarely investigated in catalytic ozonation, which might be one cause of dispute in mechanistic understanding. Herein, In-situ DRIFTS and premixing-standing experiments confirmed the generation of long-lived Mn-O 3 * complexes upon O 3 adsorption on surface Lewis acid sites of α-MnO 2 . In α-MnO 2 /O 3 system, the oxidation rate of various pollutants showed a good linear correlation with their redox potentials, as well as the energy gap between the pollutants and Mn-O 3 * complexes. Joint catalytic mechanism experiments and density functional theory calculations revealed that the oxidation of pollutants was boosted mainly because there was fast nonradical intermolecular electron transfer from the HOMO of pollutants to the LUMO of Mn-O 3 * complexes. This study illustrates the significance of surface Mn-O 3 * complex in catalytic ozonation and discloses an efficient nonradical catalytic ozonation process that is resistant to pH fluctuation and matrix interference.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yaoyu Yan,Shuchen Sun,Jing Wei,A. Shubo,Faxin Xiao,Ganfeng Tu
Electrolytic manganese residue (EMR), a hazardous solid waste from electrolytic manganese metal (EMM) production, poses serious environmental risks due to its complex mineralogy and heavy metal mobility. However, it also holds potential as a secondary resource. We establish an end-to-end waste-to-materials flowsheet—sulfuric-acid curing → water leaching → impurity removal → one-step conversion—that selectively recovers Mn from EMR and upgrades it to phase-pure, high-value Mn₃O₄ nanomaterials. The effects of curing temperature and acid dosage on the leaching behaviors of Mn, Fe, Al, and Si were systematically investigated. At 240 °C and an acid dosage of 2.5 times the stoichiometric requirement, Mn leaching efficiency reached 95.35 %, while Si leaching remained below 50 % due to silicate encapsulation and gelation. Kinetic modeling using the shrinking core model revealed that Mn dissolution was primarily controlled by product-layer diffusion, with an apparent activation energy of 14–18 kJ·mol −1 . FTIR, XRD, SEM–EDS, and BET analyses showed that acid curing disrupted the dense silicate matrix and increased surface area from 9.4 to 55.6 m 2 ·g −1 . Mn 2+ in the purified leachate was directly precipitated and oxidized using an NH₃·H₂O–H₂O₂–EDTA system, producing uniformly sized Mn₃O₄ nanoparticles. Rather than a stand-alone synthesis, the impurity-tolerant process with defined operating windows is the core contribution, with the Mn₃O₄ product validating this waste-to-value pathway. This integrated route offers a scalable framework for hazardous-waste valorization while clarifying sulfuric-acid-curing transformation and leaching kinetics, advancing sustainable metal recovery.
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Materials
·
2025
·Vol. 18
·期 15
·3633
·
IF 3.2
Hengfen Shen,Hao Du,Peng Li,Mei Wang
As an efficient clean energy technology, water electrolysis for hydrogen production has its efficiency limited by the sluggish oxygen evolution reaction (OER) kinetics, which drives the demand for the development of high-performance anode OER catalysts. This work constructs bimetallic (Al, Mn) co-doped nanoporous spinel CoFe 2 O 4 (np-CFO) with a tunable structure and composition as an OER catalyst through a simple two-step dealloying strategy. The as-formed np-CFO (Al and Mn) features a hierarchical flaky configuration; that is, there are a large number of fine nanosheets attached to the surface of a regular micron-sized flake, which not only increases the number of active sites but also enhances mass transport efficiency. Consequently, the optimized catalyst exhibits a low OER overpotential of only 320 mV at a current density of 10 mA cm −2 , a minimal Tafel slope of 45.09 mV dec −1 , and exceptional durability. Even under industrial conditions (6 M KOH, 60 °C), it only needs 1.83 V to achieve a current density of 500 mA cm −2 and can maintain good stability for approximately 100 h at this high current density. Theoretical simulations indicate that Al and Mn co-doping could indeed optimize the electronic structure of CFO and thus decrease the energy barrier of OER to 1.35 eV. This work offers a practical approach towards synthesizing efficient and stable OER catalysts.
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高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 27
·2300746
·
IF 27.8
Yaoshen Niu,Zilin Hu,Bo Zhang,Dongdong Xiao,Huican Mao,Lin Zhou,Feixiang Ding,Yuan Liu,Yang Yang,Juping Xu,Wen Yin,Nian Zhang,Zhiwei Li,Xiqian Yu,Hao Hu,Yaxiang Lu,Xiaohui Rong,Ju Li,Yong-Sheng Hu
Na-ion batteries (NIBs) are promising for grid-scale energy storage applications. However, the lack of Co, Ni-free cathode materials has made them less cost-effective. In this work, Mg 2+ is successfully utilized to activate the oxygen redox reaction in earth-abundant Fe/Mn-based layered cathodes to achieve reversible hybrid anionic and cationic redox capacities. A high first charge capacity of ≈210 mAh g −1 with balanced charge–discharge efficiency is achieved without O-loss, showing a promising energy cost of $2.02 kWh −1 . Full cell against hard carbon anode without pre-sodiation shows energy density exceeding ≈280 Wh kg −1 with a decent capacity retention of 85.6% after 100 cycles. A comprehensive analysis of the charge compensation mechanisms and structural evolution is conducted. Voltage and capacity loss resulting from partially reversible Fe 3+ migration to the Na layer is confirmed, shedding light on further improvements for low-cost NIB cathodes in application scenarios.
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