Coatings
·
2024
·Vol. 14
·期 8
·1021
·
IF 2.9
Tao Jiang,Junjie Xu,Chuntao Ge,Jie Pang,Jun Zhang,Geir Martin Haarberg,Saijun Xiao
Molten salt electrophoretic deposition is a novel method for preparing coatings of transition metal borides such as TiB2, which has emerged in recent years. To broaden the applications of transition metal boride coatings prepared by this method, this paper investigates the corrosion resistance of TiB2coatings, produced through molten salt electrophoretic deposition, to liquid zinc. By applying a cell voltage of 1.2 V (corresponding to an electric field of 0.6 V/cm) for 1 h in molten NaF-AlF3, the nanoscale TiB2particles migrated to the cathode and were deposited on the graphite substrate, forming a smooth and dense TiB2coating with a thickness of 43 μm. Subsequently, after subjecting the TiB2-coated graphite to corrosion resistance tested in molten zinc for 120 h of continuous immersion, no cracks were observed on the surface or within the coating. The produced TiB2coating demonstrated excellent corrosion resistance. These research results suggest that the fully dense TiB2coating on the graphite substrate, produced through molten salt electrophoretic deposition, exhibits excellent corrosion resistance to liquid zinc.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2316788
·
IF 18.5
Mingyang Zhong,Yang Wang,Yihua Xie,Shouyi Yuan,Kai Ding,Elijah J. Begin,Yingjie Zhang,Junwei Lucas Bao,Yonggang Wang
Owing to the intrinsically high safety, low cost, natural abundance, and high energy density of Zn metal, aqueous Zn ion batteries (AZIBs) have become a promising candidate for large-scale energy conversion and storage. However, the practical application of AZIBs is hampered by the severe Zn dendrites growth and the poor low-temperature performance due to the elevated freezing point of aqueous electrolyte. Herein, the study proposes a new kind of room-temperature liquid Zn salt, which is called Zn coordinated ionic liquid (i.e., (EMIM) 5 Zn(OTF) 7 ), for all-temperature AZIBs. The aqueous electrolyte containing 0.261 mol kg −1 (EMIM) 5 Zn(OTF) 7 in Ethylene Glycol (EG) / H 2 O (6:4) exhibits ultralow freezing point below −100 °C. The liquid Zn salt and EG molecules not only modulate the solvation structure of Zn 2+ ion, reducing the coordinated H 2 O in the first solvation sheath, but also suppresses the parasitic side reaction. As a proof of concept, Zn || Zn symmetric cells and Zn || PANI full cells with the designed electrolyte achieve improved cycling stability and can operate under wide temperature (from −40 to 60 °C). Even with high Zn utilization ratio of 40%, long cycle life over 70 times with capacity retention of 80% is achieved.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2020
·Vol. 10
·期 39
·2002241
·
IF 25.245
Teng Lv,Juanxiu Xiao,Wei Weng,Wei Xiao
Fixation of carbon dioxide into advanced energy materials is an ideal protocol to address challenges in energy and environmental sustainability, with the efficiency of CO 2 fixation and the functionality of derived materials being the key-enabling factors. Herein, using a liquid zinc cathode for CO 2 fixation in molten salts, CO 2 is electrochemically converted to graphitic carbon shells over spherical Zn cores, namely, Zn@C. The liquid Zn serves as a depolarizer to facilitate the reduction of CO 2 , and also a soft template to direct the generation of core–shell Zn@C spheres. Density functional theory calculations reveal that the coexisting Zn can enlarge the interlayer gap of graphitic carbon and induce a strong electronic interaction with AlCl 4 − . Such a strong coupling between Zn and carbon hence offers an enhanced energy storage capability of the Zn@C. The present study provides suggestions for enhancing efficiency of CO 2 fixation and value-added utilization of nonferrous metals.
研究领域:
能源材料
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 28
·2302485
·
IF 29.4
Leilei Yin,Shuai Zhang,Mingzi Sun,Siyuan Wang,Bolong Huang,Yaping Du
For current single-atom catalysts (SACs), modulating the coordination environments of rare-earth (RE) single atoms with complex electronic orbital and flexible chemical states is still limited. Herein, cerium (Ce) SAs supported on a P, S, and N co-doped hollow carbon substrate (Ce SAs/PSNC) for the oxygen reduction reaction (ORR) are reported. The as-prepared Ce SAs/PSNC possesses a half-wave potential of 0.90 V, a turnover frequency value of 52.2 s −1 at 0.85 V, and excellent stability for the ORR, which exceeds the commercial Pt/C and most recent SACs. Ce SAs/PSNC-based liquid zinc–air batteries (ZABs) exhibit a high and stable open-circuit voltage of 1.49 V and a maximum power density of 212 mW cm −2 . As the catalyst of the air cathode, it also displays remarkable performance in flexible electronic devices. Theoretical calculations reveal that the introduction of S and P sites induces significant electronic modulations to the Ce SA active sites. The P and S dopings promote the electroactivity of Ce SAs and improve the overall site-to-site electron transfer within the Ce SAs/PSNC. This work offers a unique perspective for modulating RE-based SACs in a complex coordination environment toward superior electrocatalysis and broad applications in energy conversion and storage devices.
研究领域:
材料科学
·
电化学
·
能源存储与转化
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2023
·
IF 4.1
Peipei Liu,Meiling Fan,Yapeng Cheng,Hongfei Pan,Jin Liu,Haining Zhang
Porous carbon materials with nitrogen-coordinated transition metal active sites have been widely regarded as appealing alternatives to replace noble metal catalysts in oxygen-based electrochemical reaction activities. However, improving the electrocatalytic activity of transition-metal-based catalysts remains a challenge for widespread application in renewable devices. Herein, we use a simple one-step pyrolysis method to construct a Co nanoparticles/Co–Nx-decorated carbon framework catalyst with a near-total external surface structure and uniform dispersion nanoparticles, which displays promising catalytic activity and superior stability for oxygen reduction reactions in both alkaline and neutral electrolytes, as evidenced by the positive shift of half-wave potential by 44 and 11 mV compared to 20% Pt/C. Excellent electrochemical performance originates from highly accessible Co nanoparticles/Co–Nx active sites at the external surface structure (this is, exposing active sites). The thus-assembled liquid zinc–air battery using the synthesized electrocatalyst as the cathode material delivers a maximum power density of 178 mW cm–2 with an open circuit potential of 1.48 V and long-term discharge stability over 150 h.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 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）