Journal of Energy Chemistry
·
2021
·
IF 9.676
Shuai Wang,Fanyang Huang,Zhengfeng Zhang,Wenbin Cai,Yulin Jie,Shiyang Wang,Pengfei Yan,Shuhong Jiao,Ruiguo Cao
Metal organic frameworks (MOFs) have been extensively investigated in Li-S batteries owing to high surface area, adjustable structures and abundant catalytic sites. Nevertheless, the insulating nature of traditional MOFs render retarded kinetics of polysulfides conversion, leading to insufficient utilization of sulfur. In comparison, conductive MOFs (c-MOFs) show great potential for promoting polysulfides transformation due to superb electronic conductivity. In this work, a nickel-catecholates based c-MOF, Ni-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene), is designed to regulate surface chemistry of self-supported carbon paper for advanced Li-S batteries. Taking advantage of the porous structure and high conductivity, the as-prepared Ni-HHTP is conducive to synergising strengthening the chemisorption of polysulfides and accelerating the reaction kinetics in Li-S batteries, significantly mitigating the polysulfides diffusion from the non-encapsulated sulfur cathode, therefore promoting polysulfides transformation in Li-S batteries. This work points out a promising modification strategy for developing advanced sulfur cathode in Li-S batteries.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Yong Li,Xiang Yu,Yu Fan,Guangxun Zhang,Songtao Zhang,Zhenyang Meng,Ziming Qiu,Yi-chun Su,Yangyang Sun,Nian-Tzu Suen,Hsiao-Chien Chen,Rongmei Zhu,Yecan Pi,Huan Pang
Two-dimensional (2D) conjugated metal–organic frameworks (c-MOFs) have attracted extensive interest in electrochemical fields due to their inherent electrical conductivity. However, the severe interlayer stacking still poses barriers toward their potential applications. The reliable synthesis of ultrathin c-MOF nanosheets is crucial yet remains challenging. Herein, we demonstrate an electrochemical exfoliation approach to obtain ultrathin nanosheets from layer-stacked c-MOF crystals. Our results reveal the electric field-induced ion intercalation mechanism and provide a viable method for the synthesis of ultrathin M-HHTP (M = Ni, Cu, Co; HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) nanosheets. To prove utility, the obtained Ni-HHTP nanosheets as urea oxidation reaction (UOR) catalysts achieve an ultrahigh current density of 165.7 mA cm–2 at 1.35 V versus a reversible hydrogen electrode and nearly 100% selectivity of N-products. Experimental characterization and theoretical calculations reveal that the fully exposed square planar NiO4 active centers effectively reduce the energy barrier of C–N bond cleavage for UOR and suppress the parasitic oxygen evolution reaction.
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
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 2
·396-405
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IF 7.779
Wei Shuang,Ya Wang,Fuyou Chen,Yujun Wu,Zhengyu Bai,Lin Yang
Metal–organic framework materials have numerous significant merits for use as electrodes in sodium-ion batteries, such as multiple active sites and porous structures. However, the masked active sites and pores limit their performances. Herein, we rationally selected Ni-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) with a stable structure, and adopted thermal treatment prior to its carbonization to open blocked pores and expose multiple active sites. As expected, after thermal treatment at a low temperature of 250 °C, the obtained Ni-HHTP-250 sample still retained the intrinsic crystal skeleton and crystal type, and exposed more actives sites and pores than those of pristine Ni-HHTP. The obtained Ni-HHTP-250 as an electrode material for sodium-ion batteries exhibits a large reversible discharge capacity of 420 mA h g−1 at 0.1 A g−1 along with a fine rate capability of 200 mA h g−1 at 2.0 A g−1. Mechanism studies show that both the Ni ions and organic ligands in the Ni-HHTP-250 sample are active sites. The H2O molecules and the –OH subgroups in the pores masking the active site can be removed after heat treatment. Hence, the excellent electrochemical performance is largely due to the open porous structure and exposed active sites, resulting in rapid Na+ diffusion and relatively high electronic conductivity. This work offers an innovative idea for preparing high-performance electrodes of metal-ion batteries.
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
危险品化学品经营许可证（带存储）