ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Borong Wu,Yonghuan Ren,Daobin Mu,Xiaojiang Liu,Feng Wu
The electrochemical performance of LiNi 0.5 Mn 1.5 O 4 is investigated in a sand-like carbonate electrolyte containing 4 wt.% lithium metasilicate (Li 2 SiO 3 ). The capacity fading rate of the LiNi 0.5 Mn 1.5 O 4 electrode working in the sand-like electrolyte (2-5 V) is reduced to 0.171 mAh g −1 per cycle, quite smaller than the value of 0.613 mAh g −1 per cycle in the electrolyte without Li 2 SiO 3 . The capacity of 159.5 mAh g −1 is delivered at 0.5 C after 118 cycles while it is only 99.4 mAh g −1 for the Li 2 SiO 3 -free counterpart. Cyclic voltammetry, scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopic measurements are conducted to explore the modification mechanism. It is found that the anodic stability of the sand-like electrolyte is improved compared to the base electrolyte. The Li 2 SiO 3 precipitates on the electrode surface make contribution to the performance enhancement of the cathode at high potential.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mingjie Zheng,Zhixing Chen,Yongkun Lun,Bin Liu,Wangjian Zhai,Qinyu He
Degrading the A-ring of tetracycline (TC) requires a photocatalyst with either a very negative conduction band edge (CBE) or a very positive valence band edge (VBE). In this work, a SrTiO 3 -based composite with a Sr/W ratio of 7.5% (CSWT75) was prepared by hybridizing the following components: n-type semiconductor Sr 2 WO 5 with CBE of –2.10 V, n-type semiconductor SrWO 4 with a VBE of 4.42 V, and p-type semiconductor Sr 3 WO 6 with CBE of–1.26 V, resulting in formation of z-scheme and p-n heterojunctions. Over CSWT75, the photodegradation rate of the B, C, and D rings of TC was 100% in 60 min and that of A ring was 98% in 90 min. The reaction rate constant of CSWT75 was found to be 3.4-fold that of the as-prepared pure SrTiO 3 . It is found that a high positive VBE potential like that of SrWO 4 4.42 V is more effective on degrading A-ring than a negative CBE potential −0.81 of SrTiO 3 , but less effective than a negative CBE potential −1.26 V of Sr 3 WO 6 . This study identified two new semiconductors with highly negative CBEs. This work also implys that a z-scheme structured composite hybridizing homeotype-semiconductors with very negative CBE favors in degrading A ring of TC.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2017
·Vol. 53
·期 11
·1805-1808
·
IF 6.319
Jin Han,Guan-Nan Li,Feng Liu,Minqiang Wang,Yan Zhang,Linyu Hu,Chunlong Dai,Maowen Xu
Novel K3V2(PO4)3 and three-dimensional conductive network K3V2(PO4)3/C nanocomposites are successfully fabricated and further evaluated as cathode materials for potassium-ion batteries for the first time. The K3V2(PO4)3/C nanocomposite exhibits a high-potential platform of 3.6–3.9 V and a good capacity retention of at least 100 cycles. This work may provide new insight into developing cathode materials for potassium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Wenxuan Zhang,Chuqian Xiao,Yuhang Li,Chunzhong Li
5-Hydroxymethylfurfural (HMF) electrooxidation for 2,5-furandicarboxylic acid (FDCA) production has become a sustainable method for value-added products at the anode. Here, an amorphous NiMo composite oxide supported on nickel foam (NF) is fabricated for HMF electrooxidation (HMFOR) via one-step electrodeposition. The synthesized NiMo/NF delivers 98.3% FE toward FDCA at 1.5 VRHE and maintains FE above 90% during 10 h. In situ Raman spectroscopy proves the formation of the active species Ni3+-OOH during the reaction process. Due to the introduction of high-valent Mo6+, the Ni3+ active species can be stabilized and the adsorption of aldehyde in HMF can be promoted during the reaction process, thus enhancing the FDCA electrosynthesis performance.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2022
·Vol. 16
·期 6
·8269-8280
·
IF 10.269
Wu Hao,Song Ziyu,Wang Xingxing,Feng Wenfang,Zhou Zhibin,Zhang Heng
Effective passivation of aluminum (Al) current collector at high potentials (> 4.0 V vs. Li/Li + ) is of essence for the long-term operation of lithium-based batteries. Unfortunately, the non-aqueous liquid electrolytes comprising lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and organic carbonates are corrosive toward Al current collector at high potentials (> 4.0 V vs. Li/Li + ), despite their intriguing features (e.g., good chemical stability and high ionic conductivity). Herein, we propose the utilization of N,N-dimethyl fluorosulfonamide (DMFSA) as electrolyte solvent for suppressing Al corrosion in the LiTFSI-based electrolytes. It has been demonstrated that the electrolyte of 1.0 M LiTFSI-DMFSA shows decent ionic conductivities (1.76 mS·cm −1 at 25 °C) with good fluidities (2.44 cP at 25 °C). In particular, the replacement of organic carbonates (e.g., ethylene carbonate and ethyl methyl carbonate) with DMFSA leads to significant suppressed Al corrosion. Morphological and compositional characterizations utilizing scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) reveal that DMFSA favors the formation of insoluble species (i.e., aluminum fluoride (AlF 3 )) on the surface of Al electrode, which effectively inhibits continuous exposure of fresh Al surface to electrolyte during cycling. This work provides not only a deeper understanding on the Al corrosion in LiTFSI-based electrolyte but also an elegant path to stabilize the Al current collector at high potentials (> 4.0 V vs. Li/Li + ), which may give an impetus into the development of lithium-based batteries.
研究领域:
电化学
·
材料科学
·
储能技术
·
腐蚀科学
·
电池技术
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Kangwen He,Chi Chen,Shuangjia Weng,Xing Xu,Zhoule Gu,Hongqiao Li,Yang Xia,Yinfeng Wang,Hailing Peng,Xiaoxiao Lu
Ultra-high Ni quaternary cathodes (LiNi x Co y Mn z Al 1-x-y-z O 2 , 1 x 0.8) demonstrate superior cycling stability, positioning them as promising Ni-rich cathode candidates for next-generation lithium-ion batteries. However, increasing demand for higher energy density necessitates higher operation potential, which in turn exacerbates intrinsic challenges, such as poor chemical stability and diminished thermal stability. To address these challenges, an yttrium (Y) modification strategy has been carried out to enhance structural and interfacial stability. Compared to pristine, Y-modified samples show enhanced high-potential and high-temperature performances. In detail, it reveals a specific capacity of 228.5 mAh g −1 within an extended potential window of 3.0–4.5 V and retains 90.7% of its capacity after 200 cycles. When operated at an elevated temperature of 55 °C, it also presents a good capacity retention of 80.4%. The role of Y dopant has been systematically investigated using advanced techniques such as density functional theory (DFT) and in-situ experiments. Results indicate that Y primarily substitutes Ni sites, thereby stabilizing the oxygen framework to enhance cycling stability at a higher operation potential or elevated temperature. Moreover, the formation of surface-coated solid electrolyte layers effectively suppresses interfacial side reactions, contributing to improved cyclability under high-potential and high-temperature conditions.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）