Small
·
2019
·Vol. 15
·期 47
·1904688
·
IF 10.856
Jian Zhang,Renjie Cui,Chencheng Gao,Linyi Bian,Yong Pu,Xinbao Zhu,Xing'ao Li,Wei Huang
Atom-scale modulation of electronic regulation in nonprecious-based electrocatalysts is promising for efficient catalytic activities. Here, hierarchically hollow VOOH nanostructures are rationally constructed by partial iron substitution and systematically investigated for electrocatalytic water splitting. Benefiting from the hierarchically stable scaffold configuration, highly electrochemically active surface area, the synergistic effect of the active metal atoms, and optimal adsorption energies, the 3% Fe (mole ratio) substituted electrocatalyst (VOOH-3Fe) exhibits a low overpotential of 90 and 195 mV at 10 mA cm −2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, respectively, superior than the other samples with a different substituted ratio. To the best of current knowledge, 195 mV overpotential at 10 mA cm −2 is the best value reported for V or Fe (oxy)hydroxide-based OER catalysts. Moreover, the electrolytic cell employing the VOOH-3Fe electrode as both the cathode and anode exhibits a cell voltage of 0.30 V at 10 mA cm −2 with a remarkable stability over 60 h. This work heralds a new pathway to design efficient bifunctional catalysts toward overall water splitting.
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
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 38
·20217-20227
·
IF 8.867
Wenbin Li,Jianfeng Huang,Liangliang Feng,Liyun Cao,Yongqiang Feng,Haijing Wang,Jiayin Li,Chunyan Yao
The meticulous design of coating structures is an efficient approach for enhancing the cycle life and rate capability of electrode materials. Herein, crystalline VOOH-coated VS2 microflowers (c-VS2@VOOH) constructed from nanosheets are successfully prepared by a facile one-step hydrothermal method. The c-VS2@VOOH composite as a sodium ion battery anode material delivers an excellent cycling stability of 330 mA h g−1 after 150 cycles at 0.2 A g−1. In particular, c-VS2@VOOH can still afford a high reversible capacity of 356 and 224 mA h g−1 even at 0.5 and 1.0 A g−1, respectively. The high capacity, good stability and enhanced rate capability are mainly attributed to the highly efficient surface sensitization and protection by crystalline VOOH, which can improve sodium ion diffusion and suppress the pulverization of VS2 nanosheets.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xin Wu,Ruiqian Li,Jinming Liu,Baorui Yuan,Liangjun Song,Tengfei Xiang,Huizhu Yu,Rencheng Jin
Low-valence vanadium cathode materials provide excellent electrochemical performance for aqueous zinc-ion batteries (AZIBs) after in-situ oxidative phase transition. However, these materials generally suffer from slow phase transformation rates and poor cycle stability, which limit their potential and efficiency in large-scale energy storage applications. Herein, we report a dual-engineering technique contained oxygen vacancies and amorphous mesoporous structures to boost the performance of VOOH. This strategy effectively modulates the electronic structure in V-based cathode materials and increases their reactivity with the electrolyte, resulting in a nearly 2.4-fold improvement in the phase transition efficiency compared to VOOH without dual characteristics. The transition to ZVO maintains the doping of S elements and introduces interlayer Zn 2+ ions, which facilitate enhanced charge transfer and contribute to the stability of the cathode structure. The assembled AZIBs display superior rate capability (567 and 397 mAh g −1 at 0.1 and 5 A g −1 , respectively) and have an ultra-long cycle life (92% capacity retention over 2000 cycles at 5 A g −1 ). Additionally, the underlying electrochemical reaction mechanisms and determinant factors of the conversion processes have been meticulously investigated through ex-situ characterizations. This work provides new insights into the development of high-performance vanadium oxide-based cathodes for AZIBs.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xingrong Yin,Xiongwei Wu,Fangzhong Liu,Bei Long
The vanadium oxyhydroxide has attracted considerable attention as a cathode in aqueous zinc-ion batteries due to its changeable morphology and high theoretical capacity. However, poor conductivity and structural disintegration limit its further application. Herein, we prepare VOOH nanoparticles and apply them onto carbon cloth, followed by coating with poly(3,4-ethylenedioxythiophene) (VOOH@PEDOT). The PEDOT coating layer and carbon cloth substrate significantly mitigate volume change and enhance electrode conductivity during cycling. Benefiting from the improved charge transfer and structural stability, the optimized VOOH@PEDOT displays an excellent discharge capacity of 230 mA h/g and good cycle stability over 500 cycles at 1 A/g. Additionally, the energy storage mechanism is elucidated through ex-situ XRD analysis.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）