International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 1
·498-505
·
IF 1.5
Jian Lu,Jianling Li,Zhixun Zhu,Yuguang Zhao,Cheng Chen,Feiyu Kang
Porous Co 3 Mo 3 N nanorods were prepared by hydrothermal process combined with ammonia annealing and applied as catalyst in Li-O 2 battery cell. The battery with the porous Co 3 Mo 3 N nanorods showed a higher initial discharge capacity of 7902.8 mAh/g c at current density of 100 mAh/g c than that with the pure Ketjen black. Moreover, the Co 3 Mo 3 N-based electrode displayed lower overpotential and better cycling performance than that of the carbon-only cathode. Such performance can be associated with the synergistic effects of high electrocatalytic activity and porous structure of the Co 3 Mo 3 N nanorods.
研究领域:
材料科学
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电化学
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储能
·
纳米材料
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
·
2022
·
IF 1.107
Zheng Jin,Suihan Cui,Cuiqing Jiang,Tijun Li,Chao Yang,Zhongzhen Wu
Reaction polarization of the Li(NixMnyCoz)O2 (NMC) cathode materials can be significantly alleviated by depolarization and pre-lithiation, which respectively produce electrolyte protective layer and double-layer lithium structure. These structures can not only prevent Ni ions from dissolution but also increase the discharge capacity. However, as the size of the regular NMC particles is relatively large, the effect of depolarization and pre-lithiation is not significant. This work tries to prepare NMC with nanoscale structure and high specific surface area by electrospinning, and studies the effect on NMC morphology caused by calcination atmosphere, oxidation temperature, decarburization temperature and calcination temperature. It is hoped that the polarization can be further eliminated by optimizing the size, and the proportion of double-layer lithium formed in the pre-lithiation can be increased. The results reveal that after several steps including pre-oxidation at 200°C, decarburization at 550°C and calcination at 750°C, nano lamellar structures with size of about 1–3 μm and thickness of about 30 nm can be produced under O2 flow of 200 SCCM. NMC with nano lamellar structures will further alleviate the polarization and produce a higher proportion of double-layer lithium structure by pre-lithiation, resulting in a significant improvement of the discharge capacity.
研究领域:
材料科学
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电化学
·
储能技术
·
纳米材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Tuo Zhao,Ying Yao,Yifei Yuan,Meiling Wang,Feng Wu,Khalil Amine,Jun Lu
The main bottleneck in the application of biomass-based carbon material in energy field is the development of an economical, nanoscale controllable and universal fabrication method . Herein, we demonstrate that a biomass-derived carbon consisting of loose carbon nanosphere clusters could serve as an ideal cathode material for high performance Li-O 2 batteries . The carbon nanomaterial can be prepared from both biomass derivatives and crude biomass by a low cost, facile and nanoscale controllable method. The open slit-shaped hierarchical pore structure endows the electrode sufficient active surface sites and mass transport channels that are not easily asphyxiated by the discharge products. The concentration of oxygenic groups and structure defects on the surface of obtained carbon materials is very low, which minimizes the side reactions associated with carbon decomposition. The unique pore structure and surface properties of the carbon electrode give rise to a superhigh specific capacity of 20,300 mA h g −1 and an extremely long cycle life which a cyclic capacity retention of 100% is maintained for 543 cycles with current density of 0.2 mA cm −2 at controlled discharge-charge depths of 500 mA h g −1 .
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Guixian Deng,Guifang Zhang,Xing Zhu,Qingjie Guo,Xiangbiao Liao,Xi Chen,Kongzhai Li
Reduction of CO 2 in presence of oxidative impurity ( e.g. , O 2 ) is more promising than utilization of pure CO 2 due to skyrocketing cost for purification of captured CO 2 from air or industrial exhaust gas. In this work, Ni-based catalysts are modified by CeO 2 and ZrO 2 to suppress negative effect of O 2 on reforming of CO 2 with methane, which show high CH 4 conversion (97 %) and CO 2 conversion (95 %) at 750 °C and can maintain high CO 2 conversion even with high O 2 content. The physicochemical characterizations on fresh and spent catalysts show that the interaction among Ni, CeO 2 and ZrO 2 results in well dispersion of smaller Ni particles, even after long-term testing. In situ DRIFTS results show that Ni/CeO 2 -ZrO 2 -SiO 2 catalyst shows advantage to activate CH 4 to generate active CH 3 *, promoting the formation of CO, and the CeO 2 -ZrO 2 solid solution improves the CO 2 adsorption, thereby reducing the competitive effect of CO 2 and O 2 .
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Mengyuan Song,Changhao Tian,Chunguang Chen,Tao Huang,Aishui Yu
Lithium-oxygen batteries show great energy storage potential due to their high energy density . However, it is difficult for conventional liquid electrolytes to form a stable solid electrolyte interface (SEI) on cathode surface to ensure long-term stable cycling of lithium-oxygen batteries . Herein, LiBOB is added to the LiTFSI-based electrolyte to solve the above-mentioned problems. By introducing LiBOB into LiTFSI single-salt electrolyte system, the electron delocalization of the BOB − anion induces the dissociation equilibrium of the lithium salt to occur positively and the formed electrolyte exhibits good ionic conductivity . Different amounts of LiBOB show different characteristics in electrochemical performance. Trace amounts of LiBOB as an additive increase the solvation of Li + and improve the discharge capacity of the cell. Furthermore, the synergistic effect of the LiTFSI-LiBOB dual-salt electrolyte forms a protective SEI when LiBOB has a larger proportion of lithium salts in the electrolyte, resulting in comparable cycling performance. This work demonstrates a promising approach to design electrolytes for long-term stable cycling of lithium-oxygen batteries.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Guangjin Chen,Cuiwei Li,Huaiming Jia,Hao Li,Siyuan Li,Bo Gong,Linan An,Kepi Chen
Five equimolar multicomponent oxides were synthesized by replacing one of five cations in (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Hf 0.2 )O 2 with Ca 2+ . The results reveal that except for the one in which Ce 4+ replaced by Ca 2+ , the other four components can form single-phase high-entropy fluorite oxides (HEFOs) at different temperatures, which indicates that Ce 4+ is very important for the formation of single-phase HEFOs. The sintering behavior, lattice parameter and properties containing density, porosity, flexural strength and thermal conductivity of the four single-phase HEFOs were investigated. With the change of substituted ions, grain size, relative density, flexural strength and thermal conductivity of the materials vary greatly, which are correlated to the size disorder and mass disorder of these materials. The results of this paper provide a reference for the composition designing and performance tailoring of equimolar HEFOs.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2023
·
IF 12.9
Yanfen Fang,Dengyu Ying,Huibin Niu,Yan Xu,Shaobin Wang,Ran Duan,Huaiyong Zhu,Chaoyuan Deng,Chuncheng Chen,Yingping Huang
Although metal-rich biochar (M-BC) is widely used in soil remediation and pollution control, the activation mechanism of molecular oxygen (O2) by M-BC still needs to be clarified due to the low metal loading. In this study, we enhanced the manganese content of low-temperature manganese-rich biochar (Mn-BC) by treating it with hydrogen peroxide (H2O2), resulting in the formation of MnBC-Hx (where x represents the volume of H2O2 used in mL). MnBC-H5 was particularly effective in activating O2, leading to the successful degradation of phenol and dyes. Characterizations showed that the MnII in the outer layer of MnC2O4·2H2O nanoparticles evenly dispersed over Mn-BC was oxidized to MnIII by H2O2. This process was accompanied by the removal of coordinated H2O, resulting in the formation of MnIIIC2O4 on MnBC-H5. Under visible light irradiation, MnIII can bind to O2 to form MnIIIOOH species, which facilitates the transfer of charges and generates superoxide radicals (·O2–) that effectively degrade organics. Notably, MnIII of MnBC-H5 remains stable after the organic degradation reaction. This study will not only provide a theoretical basis for developing environmentally friendly biochar-based catalysts but also promote the study of the environmental effects of biochar.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·636-641
·
IF 3.1
Fu Zerui,Wang Shu,Yu Haohan,Nie Meilin,Feng Xilan,Zuo Xintao,Fu Lichao,Liu Dapeng,Zhang Yu
Li-O 2 battery(LOB) has an ultrahigh specific capacity(3500 W·h/kg), however, its slow kinetics of oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) at cathode often leads to a high overpotential, a limited discharge capacity, and a poor cycling performance. Therefore, it is important to design and prepare cathode materials with a excellent catalytic activity. In this study, CeO 2 nanoparticles(NPs) supported on reduced graphene oxide(rGO) have been prepared and employed as cathode. Compared with either CeO 2 NPs or rGO, CeO 2 /rGO cathode greatly improves the discharge capacity(10644 mA·h/g at a current density of 100 mA/g) and the cycling performance(95 cycles at 200 mA/g with a limited capacity of 500 mA·h/g) by virtue of the good conductivity of rGO and the oxygen storage/release capability of CeO 2 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
·
IF 5.4
Tingfei Yang,Na Chen,Anqi Li,Anrui Feng,Yihan Li,Yaru Qin,Xue Qin,Chenglong Shi
P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 cathode material is considered as an ideal cathode material for sodium-ion batteries due to its high capacity. However, it has P2-O2 phase transition, which leads to fast capacity decay. This paper investigates the effect of Zn/Al co-substitution on their chemical-electrical properties. The experimental results show that this strategy successfully transforms the unfavorable P2-O2 phase transition that occurs in the material during cycling into a reversible P2-OP4 phase transition, and the reversible capacity and capacity retention of the P2-type cathode material are significantly improved. It maintains a high energy density of up to 444 Wh·Kg −1 in the first five charge/discharge cycles, facilitating the future practical implementation and commercialization of the material.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qiang Zhou,Yi Wan,Xinyu Wang,Qinhua Zhang,Haonan Zhang,Chong Qi,Ziyu Liu,Hao Yang,Tao Xing,Mingqing Wang,Mingbo Wu,Wenting Wu
Photocatalytic oxidation of methane to methanol is a promising process under mild conditions, nevertheless confronting great challenges in achieving high yield and selectivity of methanol simultaneously. Herein, we propose a strategy for the proper amount of hydroxyl radicals (•OH) generation from O 2 by rational design of Au nanoparticles and oxygen vacancies (OVs) co-decorated ZnO photocatalysts. For photocatalytic methane oxidation at ambient temperature, a high CH 3 OH yield of 6.3 mmol·g −1 ·h −1 with a nearly 100 % selectivity has been achieved over the optimized Au 2.5 -def-ZnO (2.5 wt% Au and OVs co-decorated ZnO) photocatalyst, exceeding most reported literatures. Mechanism investigations revealed that Au nanoparticles and OVs synergistically promoted charge separation, improved the adsorption and activation of CH 4 and O 2 , facilitating the selective generation of •OH from O 2 . Combined with the aqueous phase system, the over-oxidation of CH 3 OH was effectively inhibited, thereby achieving high yield and high selectivity of CH 3 OH simultaneously. This work provides some guidance for the design of high-performance photocatalysts for photocatalytic selective oxidation of methane to methanol.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tianchang Miao,Ximeng Lv,Fangshuai Chen,Gengfeng Zheng,Qing Han
Achieving O 2 photoreduction to H 2 O 2 with high selectivity control and durability while using easily accessible catalyst requires new synthesis strategies. Herein, we propose an asymmteric Sb coordination active center strategy of introducing anthraquinone (AQ) and heptazine to form local N 3 − Sb − O coordination by a rapid and simple explosive crystallization approach, resulting in a mesoporous conjugated heptazine-amide-AQ polymer coordinated Sb (HAAQ-Sb). It is demonstrated that the N 3 − Sb − O coordination effectively suppresses the charge recombination and acts as the highly active site for O 2 adsorption. Moreover, as-introduced AQ units initiate low-barrier hydrogen transfer through a reversible redox process that triggers highly-efficient H 2 O 2 production. A superior apparent quantum yield of 20.2 % at 400 nm and a remarkable solar-to-chemical conversion efficiency of 0.71 % are achieved on the optimal HAAQ-Sb, which is the highest among C 3 N 4 -based photocatalysts at present. This asymmetric coordination concept and material design method provide new perspectives for the research of novel catalysts toward artificial photosynthesis.
研究领域:
材料科学
·
光催化
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 5
·1133
·
IF 4.6
Yuansong Zhou,Fengyu Gao,Lei Yi,Junyi Wang,Honghong Yi,Xiaolong Tang
In an O 2 -containing environment, achieving efficient selective catalytic reduction of nitrogen oxides (NOx) by carbon monoxide (CO) using non-noble metal catalysts remains a formidable challenge. To balance the catalytic oxidation of CO and the catalytic reduction of NOx, we need to develop a catalyst with strong reductibility and weak oxidizability for the CO selective catalytic reduction of NOx (CO-SCR) reaction in the presence of O 2 . In this study, we synthesized the CoCeOx-PVP catalyst via a coprecipitation method and employed various characterization techniques, including BET, SEM, XRD, Raman, XPS, H 2 -TPR, and O 2 -TPD. The analysis results indicate that the addition of polyvinylpyrrolidone (PVP) alters the surface structure of the catalyst, increases the particle size, and enhances the concentration of surface oxygen vacancies. These structural effects facilitate electron circulation and accelerate the migration of oxygen species, thereby improving the catalytic reduction performance of the catalyst and increasing the conversion rate of NOx. At 250 °C and with 5 vol% O 2 , the conversion rates of NOx and CO can attain 98% and 96%, respectively, accompanied by a remarkable N 2 selectivity of 99%. Following a sustained reaction period of 6 h, the conversion efficiencies of both NOx and CO remain above 95%. However, during extended testing periods, as the oxygen vacancies are progressively occupied by O 2 , the oxygen vacancies generated through the reduction of NO with CO fall short of sustaining the CO-SCR reaction over the long haul. Subsequently, the oxidation reactions of NO and CO come to dominate, resulting in a decline in the NOx conversion rate. Notably, the CO conversion rate still maintains 100% at this point. Based on the results of in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) experiments, we proposed a reaction mechanism for the CO-SCR process over the CoCeOx-PVP catalyst under O 2 -containing conditions. This study provides an effective strategy for the application of non-noble metal catalysts in the field of CO-SCR. Although maintaining long-term activity of the catalyst remains a challenge in the presence of O 2 , the catalyst in this study exhibits a slower deactivation rate compared to traditional non-noble metal catalysts.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）