Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·259-267
·
IF 10.733
Congcong Dang,Yu Wang,Biao He,Weibin Zhang,Feng Dang,Hongchao Wang,Yong Du
Searching for highly efficient and low cost electrocatalysts is an urgent challenge to provide high capacity and long cycle life Li–O2 batteries (LOBs). In this work, the highly efficient electrocatalytic properties of MoSi2 were first demonstrated using particles prepared by a solid–state reaction method. The surface was activated, playing a dominant role in the electrocatalytic performance. After acid etching to remove SiO2 impurities arising from the surface oxidation, MoSi2 exhibited excellent bifunctional electrocatalytic properties for LOBs. Mo6+ on the surface contributed to the initial low overpotentials of 0.45 V (3.2 V for the OER and 2.75 V for the ORR) and transformed into Mo4+ for a long cycle life. As a consequence, outstanding rate capabilities of 12 708 mA h g−1 at 100 mA g−1 and 10 794 mA h g−1 at 800 mA g−1, and excellent cycle durability of 215 and 90 cycles at a limited capacity of 1000 mA h g−1 at 200 and 500 mA g−1, respectively, were obtained for the MoSi2 cathode.
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
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiang Zhang,Xiudong Yu,Haishun Liu,Weiming Yang,Xiang Xiong,Changjiu Chen,Yu Xie
This research unveils the remarkable capability of surface-activated Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 metallic glass (SA-MG) in rapidly decolorizing the acid orange II (AO II) azo dye solution. The novel chemical surface activation (CSA) process forms a heterogenous Cu-rich layer with nanoscale Cu particles on the Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 metallic glass (MG). Despite the limited number of newly formed particles and their partial coverage of the MG surface, the SA-MG can completely decolor the AO II solution in just one minute, a speed more than 25 times faster than the as-received MG. This enhanced performance is attributed to the local galvanic-cell-enhanced bimetal Fenton-like reactions and the activated surface topography. Furthermore, the activated MG surface can form caducous flakes and a sizeable new surface area that might favor surface self-cleaning and dye adsorption. The surface-activated Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 metallic glass ribbons exhibited a high degradation rate constant k (1.4∼7.4) and good reusability (13 cycles with k higher than 1.2). This discovery presents a rapid and cost-effective surface activation for Fe-based MG, offering a promising strategy for rapidly treating printing and dying wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Haichuan He,Congcheng Yang,Liu Deng,Li Luo,Yahui Jiang,Liqiang Wang,Yi Zhang,Minghui Yang,You-Nian Liu
CO 2 -to-formate electrosynthesis with high selectivity and stability has been a long-sought objective. Unfortunately, most catalysts undergo structural and valence state changes due to surface oxidation during operation or storage, resulting in decreased catalytic performance. Herein, we report a efficient and stable BiIn@Cu-foam electrode through the in-situ regeneration of Bi 0 active sites to renew the surface activation. The electronic structure of Bi site can be regulated by introducing In, thereby enhancing the adsorption strength of *OCHO. The optimized electrode exhibits over 90% FE formate at a wide potential window (−0.9–−2.2 V), and formation rate for 3.15 mM cm −1 h −1 . Especially, the electrode can maintain the high performance at continuously electrolysis for more than 300 h, or for more than 50 cycles, even repeated operation and storage for more than 2 years. This work provides a promising candidate and new insight to construct industrially viable stable Bi-based catalyst for formate electrosynthesis.
研究领域:
材料科学
·
电化学
·
能源转化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bowen Zhao,Shuai Zeng,Xindong Qin,Zhengkun Li,Shiming Zhang,Haifeng Zhang,Zhengwang Zhu
Minor element addition will be considered to modulate the atomic structures of materials to achieve surface activation for enhancing catalytic capability. Herein, Ag minor alloying enhances the catalytic behaviors of Cu-Zr-Al MGs in degrading dye molecules due to in situ formed Cu-Ag nanocomposites as highly efficient and stable catalysts. The higher degradation efficiency and faster reaction rate for Cu 46 Zr 44.5 Al 7.5 Ag 2 ribbons than those of Cu 47.5 Zr 46 Al 6.5 ribbons are accurately achieved more than 99% efficiency and 0.32 min −1 reaction rate within 20 min after 30th run. The thermal activation energy barrier (ΔE) of 5.97 kJ mol −1 for Cu 46 Zr 44.5 Al 7.5 Ag 2 ribbons is lower than that of 8.47 kJ mol −1 for Cu 47.5 Zr 46 Al 6.5 ribbons. The enhanced capability can be attributed to the corrosion engineering and electrochemical principle, the inclusion of Ag as a cathode contributes to forming a micro-electric couple with Cu as an anode to generate a variety of active copper-based nanocomposites due to surface modification. More importantly, introducing Ag atom can promote the enrichment of Cu-Ag nanocomplexes on the surface of ribbons in order to provide stronger surface activity and faster electron transfer to further improve catalytic performance. These findings are expected to help open up new functional applications of CuZr-based MGs in environment field.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 6
·期 6
·1801690
·
IF 4.713
Lincai Wang,Jiaxuan Li,Xiangsen Zhao,Weiju Hao,Xiaohua Ma,Shengji Li,Yanhui Guo
The development of efficient and earth-abundant water-splitting electrocatalysts is of great importance for energy conversion and storage technologies. In this study, surface-activated amorphous Fe x B catalysts, Fe–B–O@Fe 2 B and Fe–B–O@FeB 2 , are synthesized and remarkable activity for the oxygen evolution reaction (OER) is achieved, e.g., Fe–B–O@FeB 2 delivering a current density of 10 mA cm −2 at overpotential of 260 mV with Tafel slope of 57.9 mV dec −1 for OER in alkaline electrolyte. Iron oxide/hydroxide and oxidized borate species on the surface of Fe x B are found to have a synergistic effect on promoting the OER activity of the sample. Moreover, it is found that the OER active oxidization layer of iron boride is less active toward hydrogen evolution reaction.
研究领域:
材料科学
·
能源技术
✓ 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）