INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Hanwei Zhao,Bowen Zhang,Enze Fan,Zhuanfang Zhang,Guohua Dong,Wenzhi Zhang,Liming Bai,Ming Zhao,Dong-Feng Chai,Xiaoming Huang
CoMoO 4 is a promising oxygen evolution reaction (OER) catalyst owing to its distinct crystallographic configuration and redox versatility. However, its practical applications remain limited by its suboptimal active site density and inefficient charge-transport mechanisms. To address these challenges, a one-step hydrothermal method is developed to introduce Al atoms into the CoMoO 4 framework, yielding an Al-doped electrocatalyst (Al–CoMoO 4 -1/NF) featuring enhanced functionality. Al–CoMoO 4 -1/NF achieves an OER current density of 10 mA cm −2 at an overpotential of 184 mV, demonstrating a Tafel slope of 55.6 mV dec −1 . In full water-splitting configurations, the Al–CoMoO 4 -1/NF(+)||Pt/C/NF(−) electrolyzer attains 10 mA cm −2 at 1.52 V, outperforming various nonprecious-metal-based systems. Al integration regulates ∗OH intermediate adsorption equilibrium and strengthens interactions with oxygenated species. Al incorporation considerably reduces charge-transfer resistance and accelerates reaction kinetics. The larger specific surface area of the Al-doped structure exposes more active sites and increases the electrode/electrolyte interfacial contact area, improving catalytic activity. These synergistic effects enhance intrinsic activity and mass-transport efficiency. Leveraging abundant Al for structural modulation, this study advances the rational design of high-performance, cost-efficient OER catalysts for sustainable energy conversion.
研究领域:
材料科学
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电化学
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
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2024
·Vol. 29
·期 6
·1369
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IF 4.2
Rui Yu,Xiaoyan Lu,Zhenjiang Lu,Yali Cao
The development of electrode materials with excellent performance serves as the key for researchers to enhance the energy density of supercapacitors. Cobalt molybdate (CoMoO4) nanomaterials have been regarded as one of the most prospective electrode materials for supercapacitors due to their high theoretical capacitance and excellent electrical conductivity. In this paper, three kinds of CoMoO4nanorods were prepared directly via simple and environmentally friendly solid-phase chemical reactions with solid inorganic salts as raw materials. According to X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) test results, different reagents had certain effects on the size and morphology of CoMoO4, and these affected its electrochemical performance. In particular, the samples prepared with Co(NO3)2·6H2O as raw material took on a more uniform micromorphology, with a better crystallinity. Simultaneously, electrochemical test results showed that the samples synthesized with Co(NO3)2·6H2O presented relatively good electrical conductivity and a large specific capacitance (177 F g−1). This may be due to the nitrates reacting more slowly during the reaction and the crystals having difficulty aggregating during growth. Therefore, the structure of the prepared CoMoO4nanomaterial was more uniform, and it was resistant to collapse during the charging and discharging process; thus, the capacitor presents the best performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Bo Yu,Guohua Jiang,Wangcong Xu,Cong Cao,Yongkun Liu,Na Lei,Uwamahoro Evariste,Pianpian Ma
The NiMoO 4 /CoMoO 4 nanorod arrays wrapped by Ni-Co-S nanosheets were successfully grown on the surface of carbon cloth (NCMOS@CC) by combining of hydrothermal and electrochemical deposition methods. And the as-prepared NCMOS@CC showed good flexibility. The obtained NCMOS@CC as electrode materials were tested in a three-electrode system, showing a pretty good specific capacitance of 778.1 F g −1 at a current density of 0.5 A g −1 and excellent rate capability using 1 M KOH as the electrolyte. The flexible asymmetric supercapacitors (FASCs) were further fabricated using NCMOS@CC as the positive electrode and activated carbon@carbon cloth (AC@CC) as the negative electrode. The fabricated FASCs exhibited a safe working range with a potential window of 0–1.6 V with a maximum energy density of 33.1 Wh Kg −1 at 0.25 A g −1 and maximum power density of 3195 W kg −1 at 4 A g −1 . The fabricated FASCs even bent at different angles still showed good flexibility and stable electrochemical properties . These performances enable the NCMOS@CC to be one of the potential flexible electrodes for using in flexible energy storage devices.
研究领域:
材料科学
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能源存储技术
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电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
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2020
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IF 5.604
T. Huang,X. Huang,C. Hu,J. Wang,H. Liu,Z. Ma,J. Zou,W. Ding
In this work, one-dimensional NiMoO 4 and CoMoO 4 nanorods are prepared and introduced into MgH 2 to improve its hydrogen storage properties. It is observed that the MgH 2 –NiMoO 4 system exhibits lower dehydrogenation temperature and faster kinetics than the MgH 2 –CoMoO 4 system and pure MgH 2 , indicating the superior promoting effect of NiMoO 4 over CoMoO 4 . Concretely, NiMoO 4 reacts with MgH 2 during the first dehydrogenation to in situ form Mg 2 Ni and Mo 0 , both of which are crucial factors for the following hydrogen cycling process. The ‘Mg 2 Ni/Mg 2 NiH 4 ’ mutual transformation upon hydrogen release/uptake is the well-known ‘hydrogen pump’ effect which boosts the hydrogen storage performance of MgH 2 . Moreover, theoretical calculations reveal the dual roles of Mo 0 played for the hydrogen storage in MgH 2 : i) it accelerates the hydrogen de/absorption of MgH 2 through weakening the Mg–H bonding; ii) it facilitates the mutual ‘Mg 2 Ni/Mg 2 NiH 4 ’ transformation as the formation energy of Mg 2 NiH 4 decreases under the influence of Mo 0 , which we call ‘facilitated hydrogen pump’ effect in this work. Ascribing to the collaborative action between Ni- and Mo- containing species, the hydrogen storage kinetics of MgH 2 has been accelerated.
研究领域:
材料科学
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纳米材料
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能源化学
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固态储氢
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金属氢化物
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催化材料
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理论计算
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）