JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xiaowei Kong,Xiaoliang Zhou,Yu Tian,Xiaoyan Wu,Jun Zhang,Wei Zuo
Development of cost-effective and efficient electrochemical catalysts for the fuel cells electrode is of prime importance to emerging renewable energy technologies . Here, we report for the first time the novel La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3−δ (LCFNb) perovskite with good potentiality for the electrode material of the symmetrical solid oxide fuel cells (SSOFC). The Sc 0.2 Zr 0.8 O 2−δ (SSZ) electrolyte supported symmetrical cells with impregnated LCFNb and LCFNb/SDC (Ce 0.8 Sm 0.2 O 2−δ ) electrodes achieve relatively high power outputs with maximum power densities (MPDs) reaching up to 392 and 528.6 mW cm −2 at 850 °C in dry H 2 , respectively, indicating the excellent electro-catalytic activity of LCFNb towards both hydrogen oxidation and oxygen reduction. Besides, the MPDs of the symmetrical cells with LCFNb/SDC composite electrodes in CO and syngas (CO: H 2 = 1:1) are almost identical to those in H 2 , implying that LCFNb material has similar catalytic activities to carbon monoxide compared with hydrogen. High durability in both H 2 , CO and syngas during the short term stability tests for 50 h are also obtained, showing desirable structure stability, and carbon deposition resistance of LCFNb based electrodes. The present results indicate that the LCFNb perovskite with remarkable cell performance is a promising electrode material for symmetrical SOFCs.
研究领域:
材料科学
·
电化学
·
能源材料
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燃料电池
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催化化学
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DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-8
·
IF 3.578
Yu Miao,Sun Haoxuan,Huang Xiaona,Yan Yichao,Zhang Wanli
Recently, reported perovskite solar cells (PSCs) with high power conversion efficiency (PCE) are mostly based on mesoporous structures containing mesoporous titanium oxide (TiO 2 ) which is the main factor to reduce the overall hysteresis. However, existing fabrication approaches for mesoporous TiO 2 generally require a high-temperature annealing process. Moreover, there is still a long way to go for improvement in terms of increasing the electron conductivity and reducing the carrier recombination. Herein, a facile one-step, in situ, and low-temperature method was developed to prepare an Nb:TiO 2 compact-mesoporous layer which served as both scaffold and electron transport layer (ETL) for PSCs. The Nb:TiO 2 compact-mesoporous ETL-based PSCs exhibit suppressed hysteresis, which is attributed to the synergistic effect of the increased interface surface area caused by nano-pin morphology and the improved carrier transportation caused by Nb doping. Such a high-quality compact-mesoporous layer allows the PSCs assembled using optimized 2% Nb-doped TiO 2 to achieve a remarkable PCE of 19.74%. This work promises an effective approach for creating hysteresis-less and high-efficiency PSCs based on compact-mesoporous structures with lower energy consumption and cost.
研究领域:
材料科学
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光伏技术
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纳米材料
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能源化学
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半导体器件
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表面工程
✓ 已验证
DOI
高影响因子
Results in Surfaces and Interfaces
·
2025
·
IF 4.4
Xin Liu,Jinshan Zhang,Xin Wang,Xu Zheng,Yong Du,Meichen Pan,Chen Liu,Hisahiro Einaga,Hajime Hojo,Pengwei Huo
With the increasingly stringent requirements for the treatment of industrial nitrogen oxides (NO x ), ammonia selective catalytic reduction (NH 3 -SCR) has emerged as the most widely adopted denitrification technology in industrial settings. A series of CeNbO x nano-catalyst with varying Nb compositions were synthesized via the solvothermal method for NH 3 -SCR. All the CeNbO x samples presented considerable NO x conversion, exceeding 80% within a broad temperature window of 200-350°C. In addition, the optimal sample shown high stability and strong resistance to SO 2 /H 2 O at 225°C. The influence of Nb element on structural properties of the CeNbO x samples was investigated and elucidated using multiple characterization techniques. The NH 3 -SCR process was further studied by in situ infrared Fourier transform spectroscopy ( in situ FTIR ), temperature-programmed reduction with H 2 (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS), which revealed that the improved NO x conversion can be attributed to the role of Nb in suppressing the crystal growth of CeO 2 , promoting the adsorption of oxygen species, increasing the distribution of Ce and improving the redox ability.
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产品关联
DOI
高影响因子
Open Ceramics
·
2025
·
IF 2.8
Chengjian Li,Frank Kern,Lianmeng Liu,Christopher Parr,Andreas Börger,Chunfeng Liu
Garnet-type Li₇La₃Zr₂O₁₂ (LLZO) is a promising solid electrolyte for all-solid-state batteries due to its high ionic conductivity and excellent thermal stability. However, production of high performance LLZO remains constrained by the reliance on high-purity reagents and complex synthesis routes. This study presents a cost-effective strategy to prepare high-performance Ta- and Nb-doped LLZO using commercially sourced raw materials via conventional solid-state reaction. Two lithium precursors, Li 2 CO 3 and LiOH·H₂O, were systematically compared to evaluate their impacts on formation and performances of LLZO. LiOH-derived powders showed higher phase purity and finer morphology, while Li 2 CO 3 -derived powders offered better processability. While the LLZNO-LOH sample achieved 94.4% relative density and 0.78 × 10⁻ 3 S/cm conductivity, LLZTO-LCO also reached 0.75 × 10⁻ 3 S/cm with a relative density of 94.1%. All sintered samples exhibited phase-pure cubic garnet structures. These findings demonstrate the industrial feasibility of LLZO production, paving the way for its practical deployment in next-generation solid-state batteries.
研究领域:
材料科学
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电化学
·
固态化学
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储能技术
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陶瓷材料
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 32
·27094-27101
·
IF 3.289
Xiao Yu,Ling Xin,Yong Liu,Wenxia Zhao,Baojun Li,Xiang Zhou,Hui Shen
One of the main drawbacks with applying the most promising electrode materials in lithium-ion batteries is their intrinsic poor electronic conductivity. Many approaches which include mixing them with good electrical conductors have been developed to solve this problem, yet they do not improve the lattice electronic conductivity within the crystal. Here we present a one-step hydrothermal route for fabricating the core–shell heterostructures through sequential growth of the core and shell materials. The cores are Nb-doped TiO2 rods with improved conductivity that can deliver high capacity, yet the Nb2O5 nanosheets shells can act as a protective layer to prevent electrode dissolution and maintain the electrode integrity over long term cycles and contribute additional lithium storage capacity. When employed as an anode material in lithium-ion batteries, it exhibits an outstanding cycle stability of 189 mA h g−1 at 170 mA g−1 for more than 700 cycles. This work provides an important strategy to improve the conductivity of the host and construct a protective layer by simply adding a guest ion in reaction.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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无机化学
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固态化学
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电池技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Mengyuan Qiu,Yongzhi Xiong,Wei Zhao,Dong Ouyang,Zongxuan Wu,Tangtianxiang Liang,Changzhou Chen,Shengchun Hu,Hao Sun
Designing low-cost, high-performance electrocatalysts for the electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to produce 2,5-furandicarboxylic acid (FDCA) remains a significant challenge. Herein, we report a novel post-pyrolysis phosphidation method for preparing Nb- and Fe-doped CoP-based catalysts. Nb-CoP@NC delivers a current density of 91.79 mA cm⁻² at a potential of only 1.50 V vs. RHE, achieving nearly 100 % HMF conversion, 98.3 % FDCA selectivity, and 95.6 % Faradaic efficiency (FE). Structural and surface analyses via XRD and XPS reveal that Nb doping significantly modulates the electronic structure of CoP, generating Nb 5+δ active species, which show superior catalytic activity for HMFOR compared to Fe 3+δ . This work not only highlights the pivotal role of Nb doping in enhancing catalytic performance but also provides a general and facile strategy for constructing efficient bimetallic CoP-based catalysts for biomass-derived HMF oxidation.
研究领域:
催化
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电化学
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生物质转化
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材料科学
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绿色化学
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产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 6
·1299
·
IF 3.1
Xiukun Jiang,Yan Xin,Bijiao He,Fang Zhang,Huajun Tian
Lithium iron phosphate (LiFePO4, LFP), an olivine–type cathode material, represents a highly suitable cathode option for lithium–ion batteries that is widely applied in electric vehicles and renewable energy storage systems. This work employed the ball milling technique to synthesize LiFePO4/carbon (LFP/C) composites and investigated the effects of various doping elements, including F, Mn, Nb, and Mg, on the electrochemical behavior of LFP/C composite cathodes. Our comprehensive work indicates that optimized F doping could improve the discharge capacity of the LFP/C composites at high rates, achieving 113.7 mAh g−1at 10 C. Rational Nb doping boosted the cycling stability and improved the capacity retention rate (above 96.1% after 100 cycles at 0.2 C). The designed Mn doping escalated the discharge capacity of the LFP/C composite under a low temperature of −15 °C (101.2 mAh g−1at 0.2 C). By optimizing the doping elements and levels, the role of doping as a modification method on the diverse properties of LFP/C cathode materials was effectively explored.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 34
·22070-22081
·
IF 4.036
Xin Fu,Ruisong Li,Yucang Zhang
This study explores an aerosol-assisted method to prepare an efficient support for the Pt catalyst of polymer electrolyte membrane fuel cells (PEMFCs). Titania nanoparticles and mesoporous niobium-doped titania nanoparticles were prepared by aerosol-assisted self-assembly using titanium(IV) isopropoxide and niobium(V) ethoxide as the titanium and niobium sources for application as non-carbon supports for the platinum electrocatalyst. The structural characteristics and electrochemical properties of the supports were investigated by transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, inductively coupled plasma optical emission spectrometry, and dynamic light scattering. The Brunauer–Emmett–Teller method was used to calculate the specific surface areas of the samples, and the pore size distribution was also examined. The results demonstrated that under a radial concentration gradient, the aerosol droplets self-assembled into a spherical shape, and mesoporous supports were obtained after subsequent removal of the surfactant cetyltrimethylammonium bromide by annealing and washing. The hydrothermal technique was then used to deposit platinum on the TiO2-based supports. The electrical conductivity of the non-carbon support was enhanced by the strong metal–support interaction effect between the platinum catalyst particles and the porous niobium-doped TiO2 support. The half-wave potential, electrochemical surface area, mass activity, and specific activity of the obtained Pt/Nb-TiO2 catalyst all surpassed those of commercial Pt/C.
研究领域:
材料科学
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电化学
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催化
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纳米技术
·
能源材料
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 3
·560
·
IF 3.057
Yan Ji,Cankai Zhou,Feng Lin,Bingjing Li,Feifan Yang,Huali Zhu,Junfei Duan,Zhaoyong Chen
The garnet Li7La3Zr2O12(LLZO) has been widely investigated because of its high conductivity, wide electrochemical window, and chemical stability with regards to lithium metal. However, the usual preparation process of LLZO requires high-temperature sintering for a long time and a lot of mother powder to compensate for lithium evaporation. In this study submicron Li6.6La3Zr1.6Nb0.4O12(LLZNO) powder―which has a stable cubic phase and high sintering activity―was prepared using the conventional solid-state reaction and the attrition milling process, and Li stoichiometric LLZNO ceramics were obtained by sintering this powder―which is difficult to control under high sintering temperatures and when sintered for a long time―at a relatively low temperature or for a short amount of time. The particle-size distribution, phase structure, microstructure, distribution of elements, total ionic conductivity, relative density, and activation energy of the submicron LLZNO powder and the LLZNO ceramics were tested and analyzed using laser diffraction particle-size analyzer (LD), X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Electrochemical Impedance Spectroscopy (EIS), and the Archimedean method. The total ionic conductivity of samples sintered at 1200 °C for 30 min was 5.09 × 10−4S·cm−1, the activation energy was 0.311 eV, and the relative density was 87.3%. When the samples were sintered at 1150 °C for 60 min the total ionic conductivity was 3.49 × 10−4S·cm−1, the activation energy was 0.316 eV, and the relative density was 90.4%. At the same time, quasi-solid-state batteries were assembled with LiMn2O4as the positive electrode and submicron LLZNO powder as the solid-state electrolyte. After 50 cycles, the discharge specific capacity was 105.5 mAh/g and the columbic efficiency was above 95%.Keywords:solid-state electrolyte;submicron powder;garnet;lithium-ion conductivity;solid-state batteries
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Yuzhen Dang,Yurong Wu,Zhe Xu,Runguo Zheng,Zhiyuan Wang,Xiaoping Lin,Yanguo Liu,Sha Liu,Leijie Zhang,Dan Wang
P2-type manganese-based cathode materials are notable for their high theoretical capacity and open prismatic channels. However, rapid capacity decay caused by harmful irreversible phase transformations (P2-O2) and oxygen release in the high-voltage region (>4.2 V) limits their commercial application. Here, a co-doping strategy with lithium and niobium is proposed to enhance the structural stability at both room-temperature (RT) and low-temperature (LT) over extended cycles. The X-ray absorption near-edge spectra and first-principles calculations reveal that Li doping elevates the valence states of transition metals, thereby enhancing the reversibility of anionic redox reactions. Additionally, Nb doping leads to the formation of a rock-salt-like phase on the surface, which improves the stability of the electrode/electrolyte interface. In situ X-ray diffraction and differential electrochemical mass spectrometry show that Li and Nb co-doping prevents the P2-O2 phase transition, suppresses gas release, and enhances long-cycle stability. The P2-Na 0.67 Ni 0.24 Mn 0.64 Li 0.1 Nb 0.02 O 2 (NNMLNb) exhibits a reversible specific capacity of 127.4 mAh g −1 and 101.5 mAh g −1 at -20 °C and -30 °C, respectively. Remarkably, the sample cycles stably for 1200 cycles with a discharge capacity of 85 mAh g −1 , corresponding 90 % capacity retention. This work provides a novel strategy to improve the cycling life of sodium-ion batteries at both RT and LT.
研究领域:
能源材料
·
电化学
·
电池技术
·
材料科学
·
固态化学
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产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200827
·
IF 9.14
Qimin Peng,Xiaoling Zhuang,Longgui Wei,Luyan Shi,Tayirjan Taylor Isimjan,Ruobing Hou,Xiulin Yang
Graphical A thorny challenge : A nanothorn-like superhydrophilic Nb−CoSe 2 /CC (CC=carbon cloth) catalyst is fabricated through a facile in-situ hydrothermal selenization and Ar annealing strategies. The catalyst illustrates an excellent oxygen evolution activity (297 mV at 200 mA cm −2 ), outstanding long-term durability, and good overall water splitting performance (1.93 V at 500 mA cm −2 ). Developing cost-effective, highly active, and robust electrocatalysts for oxygen evolution reaction (OER) at high current density is a critical challenge in water electrolysis since the sluggish kinetics of the OER significantly impedes the energy conversion efficiency of overall water splitting. Here, a 1D nanothorn-like Nb−CoSe 2 /CC (CC=carbon cloth) structure was developed as an efficient OER catalyst. The optimized Nb−CoSe 2 /CC catalyst exhibited remarkable OER performance with the low overpotentials of 220 mV at 10 mA cm −2 and 297 mV 200 mA cm −2 and a small Tafel slope (54.1 mV dec −1 ) in 1.0 m KOH electrolyte. More importantly, the Nb−CoSe 2 /CC electrode displayed superior stability after 60 h of continuous operation. In addition, cell voltages of 1.52 and 1.93 V were required to achieve 10 and 500 mA cm −2 for the electrolyzer made of Nb−CoSe 2 /CC (anode) and the Pt/C (cathode). Density functional theory (DFT) calculations combined with experimental results revealed that incorporating niobium into the CoSe 2 could optimize the adsorption free energy of the reaction intermediates and enhance the conductivity to improve the catalytic activity further. Additionally, the super-hydrophilicity of Nb−CoSe 2 /CC resulting from the surface defects increased the surface wettability and facilitated reaction kinetics. These results indicate that Nb−CoSe 2 /CC intrinsically enhances OER performance and possesses potential practical water electrolysis applications.
研究领域:
电化学
·
材料科学
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催化
·
能量转换
·
纳米技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Shi Qinhao,Qi Ruijuan,Feng Xiaochen,Wang Jing,Li Yong,Yao Zhenpeng,Wang Xuan,Li Qianqian,Lu Xionggang,Zhang Jiujun,Zhao Yufeng
The application of sodium-based batteries in grid-scale energy storage requires electrode materials that facilitate fast and stable charge storage at various temperatures. However, this goal is not entirely achievable in the case of P2-type layered transition-metal oxides because of the sluggish kinetics and unfavorable electrode|electrolyte interphase formation. To circumvent these issues, we propose a P2-type Na 0.78 Ni 0.31 Mn 0.67 Nb 0.02 O 2 (P2-NaMNNb) cathode active material where the niobium doping enables reduction in the electronic band gap and ionic diffusion energy barrier while favoring the Na-ion mobility. Via physicochemical characterizations and theoretical calculations, we demonstrate that the niobium induces atomic scale surface reorganization, hindering metal dissolution from the cathode into the electrolyte. We also report the testing of the cathode material in coin cell configuration using Na metal or hard carbon as anode active materials and ether-based electrolyte solutions. Interestingly, the Na||P2-NaMNNb cell can be cycled up to 9.2 A g −1 (50 C), showing a discharge capacity of approximately 65 mAh g −1 at 25 °C. Furthermore, the Na||P2-NaMNNb cell can also be charged/discharged for 1800 cycles at 368 mA g −1 and −40 °C, demonstrating a capacity retention of approximately 76% and a final discharge capacity of approximately 70 mAh g −1 .
研究领域:
材料科学
·
电化学
·
储能技术
·
电池技术
✓ 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）