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Free water based high capacity aqueous magnesium ion battery with nano-amorphized cathodic V6O13@Mg-MnO2 in the presence of Cl-

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CHEMICAL ENGINEERING JOURNAL 2025年 510卷

作者： Li, Xueting Suo, Caili Zhang, Bo Hu, Bin Huang, Jinwang Zhao, Yuxiang Zhang, Wanzhen Ji, Xiafang Li, Wu Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens & Highly Efficient Utilizat Sal Qinghai Prov Key Lab Resources & Chem Salt Lakes Xining 810008 Qinghai Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

In conventional aqueous magnesium-ion battery designs, strategies to enhance capacity have predominantly focused on expanding the electrochemical stability window. For instance, approaches such as water-in-salt electrolytes, deep eutectic solvents, and organic solvent additives have been employed to reduce water content in the electrolyte. These methods effectively broaden the electrochemical stability window, suppress hydrogen and oxygen evolution side reactions, and improve energy density, Coulombic efficiency, and cycle life. However, these strategies also face the problems of high manufacturing costs, complex manufacturing processes, and electrolyte stability. In this work, we hold the opinion that facilitating ion transfer in free water, rather than expanding the electrochemical window, is the appropriate way to improve battery capacity. The free-waterbased full cell was fabricated using overdischarge pretreatment of the cell with Mg-delta-MnO2 & Vert;VO2 in the presence of a trace amount of Cl- in a 2 mol L-1 MgNO3 electrolyte. During pretreatment, the Mg-delta-MnO2 cathode undergoes nano-amorphization and becomes coated with a conductive V6O13 crystalline layer, formed via the redeposition of vanadium ions dissolved from the anode. The resulting V6O13@Mg-MnO2 nanostructure features an increased surface area, abundant ion channels, and high electronic conductivity, significantly enhancing magnesium ion transfer. Additionally, Cl- helps reduce the desolvation barrier of magnesium ions, further improving electrochemical performance. As a result, The V6O13@ Mg-MnO2 & Vert;VO2/ V6O13 full cell exhibits an exceptionally low internal resistance of 0.288 Omega cm2, a capacity of 117.55mAh g-1 with 78.48 % Coulombic efficiency after 100 cycles, and stable performance over 700 cycles. This study confirms that optimizing magnesium ion transfer in free water is an effective approach for improving the performance of aqueous magnesiumion batteries.

关键词： Aqueous magnesium ion battery Free water Nano-amorphization Overdischarge pretreatment Ion transfer Manganese dioxide

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K0.5MnO2@MWCNT@Super P Composite Electrode for Potassium-Ion Battery Cathode

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RUSSIAN JOURNAL OF ELECTROCHEMISTRY 2024年第7期60卷 584-594页

作者： Yang, Shujie Min, Xin Fan, Hui Huang, Zhaohui Ma, Bin Yang, Bozhi Liu, Chaoqi Fang, Minghao China Univ Geosci Beijing Sch Mat Sci & Technol Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol China Engn Res CtrMinist Educ Geol Carbon Storage Beijing 100083 Peoples R China Qinghai Univ Qinghai Prov Engn Res Ctr High Performance Light M Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China

With the development of energy storage, potassium ion batteries (PIBs) have gradually become a suitable substitute for lithium-ion batteries. Where the layered transition metal oxides cathode materials of potassium ion batteries have attracted much attention due to their high theoretical capacity, unique two-dimensional potassium ion diffusion channels, simple preparation and low cost. In this work, we designed a K0.5MnO2@MWCNT@Super P (KMP) composite electrode with P3-type layered structure as the cathode in PIBs through coprecipitation-high temperature sintering method. The SEM results show that the prepared KMP composite electrodes are secondary particles formed by three-dimensional network structures and particles through point-line contact and point-point contact. As a result, the composite electrode with a 7 : 2 : 1 weight ratio of K0.5MnO2, conductive carbon (Super-P: MWCNT = 1 : 1) and PVDF delivers a high initial discharge capacity of 112.7 mA h g(-1) at a current density of 20 mA g-1 and 72.1 mA h g(-1) at 100 mA g(-1). And, it has a capacity retention of 44% at 100 mA g-1 after 50 cycles. The results show that the unique three-dimensional network structure not only improves the conductivity of K0.5MnO2 material, but also effectively alleviates the volume change caused by K+ in the charging and discharging process. This study provides a new way to develop layered cathode materials for high energy density potassium ion batteries.

关键词： potassium-ion batteries cathode material MWCNT P3-type layered structure three-dimensional network structure

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Superhydrophobic magnesium hydroxide layer with self-healing behavior and long-term anti-corrosion property via surface modification with insufficiently hydrolyzed silane

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PROGRESS IN ORGANIC COATINGS 2024年 187卷

作者： Qian, Yulong Wang, Ruirui Zhang, Shipeng Suo, Ling Zhao, Yuxiang Ma, Yue Peng, Jiaoyu Ji, Lianmin Zhang, Bo Li, Wu Chinese Acad Sci Qinghai Inst Salt Lakes Key Lab Comprehens & Highly Efficient Utilizat Sal Qinghai Provl Key Lab Resources & Chem Salt Lakes Xining 810008 Qinghai Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

The long-term anti-corrosion of superhydrophobic materials is essential to its practical application, as well as the self-healing behavior which can significantly increase the lifetime of the superhydrophobic surfaces in corrosive environment. Magnesium hydroxide, as a non-toxic, eco-friendly, and low-cost material, has been applied to fabricate robust superhydrophobic layer through electrodeposition under the structure direction of xanthan gum in our reported works. In this work, we designed a method of fabricating superhydrophobic magnesium hydroxide layer with self-healing ability through a special silane modification method. 1H,1H,2H,2H-perfluorodecyltriethoxysilane was treated into a hybrid of both hydrolysate and amounts of unhydrolyzed small units. The remained unhydrolyzed units hydrolyzed during the corrosion process, and modified the exposed magnesium hydroxide again. In this way, the lifetime of the superhydrophobic surface is significantly prolonged (624 h). The prepared superhydrophobic magnesium layer also demonstrates excellent water repellency (contact angle, 157.33 +/- 4.78 degrees;sliding angle, 3.80 +/- 1.05 degrees), self-cleaning property, robustness (adhesion, 5B;linear abrasiveness, 2400 mm), and high inhibition efficiency (99.9991 %). This study put a foot further to the application of low-cost and eco-friendly superhydrophobic materials with long lifetime in the field of metal anti-corrosion.

关键词： Superhydrophobic Magnesium hydroxide Self-healing behavior Long -term anti-corrosion Silane Surface modification

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Interactions among ecosystem service key factors in vulnerable areas and their response to landscape patterns under the National Grain to Green program

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LAND DEGRADATION & DEVELOPMENT 2024年第2期35卷 898-915页

作者： Zuo, Yafan Gao, Jiawen He, Kangning Beijing Forestry Univ Sch Soil & Water Conservat Beijing Peoples R China China Acad Transportat Sci Beijing Peoples R China Beijing Forestry Univ Sch Soil & Water Conservat Beijing 100083 Peoples R China

A deeper understanding of the interactions between ecosystem services (ESs) and the drivers of the landscape patterns behind them is critical to how ecological restoration projects in ecologically sensitive and fragile areas are planned and managed. However, few studies have explored the response patterns of ESs to changes in landscape patterns from a geospatial perspective. This study aimed to reveal the relationship between key ESs and landscape pattern responses at spatial scales and to propose the optimization of ecological restoration measures in response to ES trade-offs problem. The InVEST and CASA models were used to assess the spatial and temporal characteristics of five key ESs in the Beichuan River Basin since the completion of the National Grain to Green program (2000-2020), selected five key factors are as below: habitat quality (HQ);net primary productivity (NPP);water supply (WS);soil conservation (SC);and water conservation (WC). Geographically weighted regression (GWR) models were used to reveal the trade-offs and synergies between ESs and the driving mechanisms of landscape patterns from a geospatial perspective. The results showed that landscape connectivity in the study area improved and landscape fragmentation decreased during 2000-2020, accompanied by the increase in HQ, SC, and WC, while NPP and WS decreased. The trade-offs between ESs appeared mainly between NPP and other ESs, with the NPP-WS pair trade-off being the strongest. Spearman correlation analysis, geographic detectors, and GWR revealed that the dominant landscape pattern indices affecting ESs showed good agreement. The interaction of the two landscape pattern indices had stronger explanatory power for the variation in ESs than any single landscape pattern index. The patch density index, as the most important landscape pattern index affecting NPP and WS, should be the primary consideration in future landscape planning to reconcile the contradiction between WS and NPP. Because of the

关键词： alpine hilly areas geographically weighted regression InVEST model trade-off and synergy

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Lithium-functionalized TEMPO-oxidized cellulose nanofiber as a novel binder and its impact on the ionic conductivity performance of lithium-ion batteries

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CELLULOSE 2024年第16期31卷 9681-9698页

作者： Ma, Jianzhe Nan, Hui Yang, Guijun Li, Zhike Wang, Jianhao Zhou, Jingyuan Xue, Caihong Wang, Xianlan Xu, Shiai Qinghai Univ Sch Mech Engn Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China Qinghai Univ Sch Chem Engn Xining 810016 Peoples R China Qinghai Beijie New Mat Technol Co LTD Xining 810021 Peoples R China East China Univ Sci & Technol Sch Mat Sci & Engn Shanghai Key Lab Adv Polymer Mat Shanghai 200237 Peoples R China

Flexible lithium-ion batteries (LIBs) are receiving widespread attention, and how to obtain the high flexibility, safety, and energy density of LIBs at the same time are one of the main challenges in the field of flexible electronics. The multi-network structure formed by cellulose nanofiber (TOCNF) not only provided sufficient mechanical support and excellent flexibility for the electrode but also promoted uniform distribution of conductive agents and active materials. In this work, we prepared an eco-friendly TOCNF binder from wheat straw, using a method involving 2, 2, 6, 6-tetramethylpiperidinyl-1-oxyl oxidation and high-intensity ultrasonic treatment. Additionally, we enhanced the performance of TOCNF by introducing Li+ through ion exchange, resulting in lithium-functionalized cellulose nanofibers (TOCNF-Li), which were employed as a novel binder for LiFePO4 cathodes. The findings show that, when employing TOCNF-Li binder, batteries were able to obtain an initial discharge capacity of 163 mAh g-1 at 0.1 C rate and maintained 93.2% of the initial reversible capacity after 400 cycles at 2 C rate. Notably, at 5 C rate, the discharge capacity reached 133.7 mAh g-1, with a capacity decay of only 16.1%. TOCNF-Li played a role in increasing Li+ content, opening a new pathway for Li+ transport, consequently enhancing Li+ diffusion efficiency and charge-discharge performance. Overall, TOCNF-Li serves as a novel, environmentally friendly, and efficient binder for flexible LIBs.

关键词： TEMPO-oxidized cellulose nanofibers Water-based binder Flexible electrode Lithium-ion batteries

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Co-doped P3 type K0.5Mn1-xCoxO2 (x≤0.5) cathodes for long cycle life potassium ion battery

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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 2024年 188卷

作者： Yang, Shujie Min, Xin Yang, Bozhi Liu, Xiaobao Yan, Chen Liu, Yangai Mi, Ruiyu Wu, Xiaowen Huang, Zhaohui Fang, Minghao Ma, Bin China Univ Geosci China Engn Res Ctr Minist Educ Geol Carbon Storage Beijing Key Lab Mat Utilizat Nonmet Minerals & Sol Sch Mat Sci & TechnolNatl Lab Mineral Mat Beijing 100083 Peoples R China Qinghai Univ Qinghai Prov Engn Res Ctr High Performance Light M Qinghai Prov Key Lab New Light Alloys Xining 810016 Peoples R China

Potassium-ion batteries (PIBs) are a promising alternative to lithium-ion batteries for large energy storage systems due to their abundant potassium resources and low cost. However, the electrochemical properties of cathode materials, specifically the layered transition-metal oxides, hinder the practical application and development of PIBs. To overcome this challenge, further research is needed to improve the performance of cathode materials. This work presents the preparation of a series of K0.5Mn1-xCoxO2 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) materials by doping with Co ions. As cathode materials, P3-K0.5Mn0.8Co0.2O2 shows better rate capacity and cycle performance, delivering a higher initial discharge capacity of 108.4 and 44 mAh g-1 at current rate of 20 and 200 mA g-1, respectively, compared to K0 & sdot;5MnO2. Furthermore, the as-obtained P3-K0.5Mn0.8Co0.2O2 delivers a capacity of 62 mAh g-1 even at 400 mA g-1 and maintains the discharge capacity of 34.2 mAh g-1 after 200 cycles. The addition of suitable cobalt content enhances structural stability and ion transportation kinetics, ultimately improving the rate performance and cyclic stability during K+ insertion/extraction. These results could provide a new idea for the design and development of cathode materials for potassium ion batteries.

关键词： Potassium -ion batteries Layered transition -metal oxides Co doping Conductive carbon Cycle stability

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Hydrogeochemical signatures, quality and driving forces of phreatic groundwater in a typical headwater region of the Yellow River watershed

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APPLIED WATER science 2025年第5期15卷 1-16页

作者： Liu, Kui Yan, Huijun Wang, Wanping Wang, Shengbin Wang, Zhigang Xiao, Yong Guo, Bo Wang, Jie Zhang, Shilong Zhang, Guoqiang Yang, Shaokang Liu, Yu Kunming Engn Corp Ltd Power China Kunming 650051 Peoples R China Southwest Jiaotong Univ Fac Geosci & Engn Chengdu 611756 Peoples R China Qinghai Inst Geol Environm Monitoring Xining 810008 Peoples R China Qinghai Prov Land Remediat & Ecol Restorat Ctr Xining 810008 Peoples R China Key Lab Environm Geol Qinghai Prov Xining 810001 Peoples R China Bur Qinghai Environm Geol Prospecting Xining 810001 Peoples R China Qinghai 906 Engn Survey & Design Inst Co Ltd Xining 810007 Peoples R China Qinghai Engn Res Ctr Geoenvironm Protect & Geohaza Xining 810007 Peoples R China Xiamen Inst Environm Sci Xiamen 361006 Peoples R China

Groundwater chemistry is essential for water supply to both human community and ecosystems. This study focuses on a typical headwater region of the Yellow River watershed, aiming to get insights into the hydrogeochemical characteristics and governing factors of phreatic groundwater in the large river watershed. Phreatic groundwater exhibits slightly alkaline properties in this alpine headwater region. The majority of the sampled groundwater is relatively fresh. Groundwater hydrochemical facies are predominantly of Ca-HCO3 type, gradually evolving to MgCa-Cl type, and then to Na-Cl along the groundwater flow path. Groundwater hydrochemical composition is primarily governed by sulfates dissolution, silicates weathering, and cation exchange reactions in natural processes. Agricultural practices and municipal sewage contribute nitrogen and chemical constituents into phreatic aquifers, resulting in increased salinity and the progressive deterioration of phreatic groundwater quality. Approximately 25% of sampling groundwater exceeded the recommended limit for NO3-, and around 20% surpassed the limit for F-. These exceedances could potentially pose health risks to the population due to oral exposure. Groundwater exhibits significant variation in hydrochemical quality, with EWQI values ranging from 26 to 185. The majority (75%) of sampled groundwaters have the EWQI values less than 100, and are suitable for direct human consumption. Considering the rising population density in the alpine headwater region of large river watershed worldwide, the ongoing monitoring of groundwater supplies is essential to detect any potential toxic substances that may arise from human activities.

关键词： Groundwater quality Hydrochemistry Nitrate Fluoride Human activity Alpine headwater region

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Clinical efficacy and safety study of vNOTES for benign ovarian tumors in obese patients

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SCIENTIFIC REPORTS 2025年第1期15卷 1-6页

作者： Wang, Fei Liu, Yuqin Xing, Yue Wang, Dongdong Bai, Xue Li, Linlin Ma, Chunhua Sun, Yongjuan Bai, Yufang Wang, Liehong Qinghai Univ Sch Clin Med Xining 810000 Qinghai Peoples R China Qinghai Red Cross Hosp Dept Gynaecol & Obstet Xining 810000 Qinghai Peoples R China Qinghai Univ Dept Gynaecol & Obstet Affiliated Hosp Xining 810000 Qinghai Peoples R China

To evaluate the clinical efficacy and safety of transvaginal natural orifice transluminal endoscopic surgery (vNOTES) for treating benign ovarian tumors in obese patients. A retrospective analysis was conducted on the clinical data of 35 obese patients who underwent vNOTES for benign ovarian tumor resection and 41 obese patients who underwent multi-port laparoscopic surgery (MPLS) during the same period from January 2021 to June 2024 at qinghai Red Cross Hospital. Key parameters such as operative time, intraoperative blood loss, intraoperative and postoperative complications, hospitalization duration, postoperative anal exhaust time, postoperative visual analog scale (VAS) score, and SF-36 score were analyzed. No statistical differences were observed between the two groups regarding baseline characteristics such as age, body mass index (BMI), tumor diameter, parity, and history of pelvic surgery. The vNOTES group exhibited shorter operative times compared to the MPLS group, with no significant differences in tumor pathology, intraoperative blood loss, or tumor rupture rates. Postoperatively, the vNOTES group had shorter hospital stays, fewer postoperative complications, lower 24-hour postoperative VAS scores, and higher three-month postoperative SF-36 scores compared to the MPLS group. No differences were found between the groups concerning anal exhaust time, sexual satisfaction rate, or 24-hour postoperative VAS scores. vNOTES is a safe and feasible surgical method for treating benign ovarian tumors in obese patients, offering advantages such as no abdominal incisions and quicker postoperative recovery.

关键词： vNOTES Obesity Benign ovarian tumor Clinical efficacy Retrospective analysis

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Large-scale photovoltaic farms significantly change the vegetation diversity and biomass through influencing soil moisture and physiochemical properties

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VADOSE ZONE JOURNAL 2025年第2期24卷

作者： Yue, Shengjuan Wu, Wei Yuan, Bo Ye, Deli Bai, Wenwen Qinghai Univ Sch Civil Engn & Water Resources Xining Peoples R China Qinghai Univ Lab Ecol Protect & High Qual Dev Upper Yellow Rive Xining Peoples R China Qinghai Univ Key Lab Water Ecol Remediat & Protect Headwater Re Minist Water Resources Xining Peoples R China Xian Univ Technol State Key Lab Ecohydraul Northwest Arid Reg China Xian Peoples R China Xian Univ Sci & Technol Coll Geol & Environm Xian Peoples R China Huanghe Hydropower Dev Co Ltd Xining Peoples R China

Large-scale deployment of photovoltaic (PV) farms alters the surrounding microclimate. Microclimate changes and engineering buildings have caused significant changes in vegetation, although the mechanisms behind change have yet to be thoroughly investigated. The goal of this study was to investigate the vegetation diversity, soil physicochemical properties, and their correlation in large-scale PV farms in the qinghai desert area. The results showed that species richness and the Shannon-Wiener index were significantly reduced under the PV panel (p < 0.05), while Simpson and Pielou's index were not significantly different between the PV farm and the control area (p > 0.05). The biomass increased under the PV panel. PV panels increased soil water content while significantly decreasing available phosphorus (p < 0.05). Canonical correspondence analysis showed that available phosphorus content influenced the distribution pattern of plant communities. Redundancy analysis showed that soil water content has a significant impact on plant diversity in qinghai desert regions. This study has guiding significance for vegetation restoration and management of PV farms in desert areas.

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Effects of degree of milling on bran layer structure, physicochemical properties and cooking quality of brown rice

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FOOD CHEMISTRY 2025年 462卷 140847页

作者： Li, Juan Yang, Shuai Zhong, Zhiming Xia, Tianli Zhou, Wenju Tu, Zhaoxin Chen, Zhengxing Wang, Hong Dai, Zhihua Jin, Gangqiang Du, Yan Jiangnan Univ State Key Lab Food Sci & Technol Wuxi 214122 Jiangsu Peoples R China Jiangnan Univ Natl Engn Res Ctr Cereal Fermentat & Food Biomfg Wuxi 214122 Jiangsu Peoples R China Quzhou Koolmill Sino Cereal Machinery Co Ltd Quzhou 324002 Zhejiang Peoples R China Jiangnan Univ Jiangsu Prov Engn Res Ctr Bioact Prod Proc Wuxi 214122 Jiangsu Peoples R China Jiangnan Univ Sch Food Sci & Technol Lihu Rd 1800 Wuxi 214122 Peoples R China

Effects of varying degree of milling (DOM) (0-22%) on the bran layer structure, physicochemical properties, and cooking quality of brown rice were explored. As the DOM increased, bran degree, protein, lipid, dietary fiber, amylose, mineral elements, and color parameters (a* and b* values) of milled rice decreased while starch and L* value increased. Microscopic fluorescence images showed that the pericarp, combined seed coat-nucellus layer, and aleurone layer were removed in rice processed at DOM of 6.6%, 9.2%, and 15.4%, respectively. The pasting properties, thermal properties, and palatability of rice increased as the DOM increased. Principal component and correlation analysis indicated that excessive milling lead to a decline in nutritional value of rice with limited impact on enhancing palatability. Notably, when parts of aleurone cell wall were retained, rice samples exhibited high cooking and sensory properties. It serves as a potential guide to the production of moderately milled rice.

关键词： Brown rice Milling degree Tissue layer Structure Nutrition Cooking quality

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