JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guoguo Wang,Qiuyue Chen,Jing Zhang,Xuguang An,Qian Liu,Lisi Xie,Weitang Yao,Xunping Sun,Qingquan Kong
As an eco-friendly and sustainable strategy, the electrochemical reduction of nitrite (NO 2 – ) can simultaneous generation of NH 3 and treatment of NO 2 – contamination in the environment. Herein, monoclinic NiMoO 4 nanorods with abundant oxygen vacancies self-supported on Ni foam (NiMoO 4 /NF) are considered high-performance electrocatalysts for ambient NH 3 synthesis by reduction of NO 2 − , which can deliver an outstanding yield of 18089.39 ± 227.98 μg h −1 cm −2 and a preferable FE of 94.49 ± 0.42% at −0.8 V. Additionally, its performance remains relatively stable during long-term operation as well as cycling tests. Furthermore, density functional theory calculations unveil the vital role of oxygen vacancies in promoting nitrite adsorption and activation, ensuring efficient NO 2 – RR towards NH 3 . A Zn-NO 2 – battery with NiMoO 4 /NF as the cathode shows high battery performance as well.
研究领域:
电催化
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 6
·4010-4017
·
IF 1.774
Ji Fengzhen,Pan Xuexue,Qin Juhua,Chen Xinman,Zha Qingbing
NiMoO 4 nanorods (NRs) were successfully fabricated on Ni foam with robust adhesion via a simple and cost-effective hydrothermal treatment, followed by a calcined process. In a three-electrode configuration with 3 mol L −1 KOH aqueous solution. The NiMoO 4 NRs supported on Ni foam as working electrodes achieve a high specific capacity of 1320 C g −1 at a charge and discharge current density of 2 mA cm −2 , and a desirable rate capability (884 C g −1 even at 10 mA cm −2 ) and a superior cycling ability with 88% capacity retention after 4000 cycles at 10 mA cm −2 . To enhance the energy density and enlarge the voltage window, the aqueous hybrid supercapacitor has subsequently been constructed by employing the NiMoO 4 and activated carbon electrodes as positive and negative electrodes, respectively, which delivered a high energy density of 52 Wh kg −1 at a power density of 725 W kg −1 . Impressively, the device indicates a long-term cycling stability with capacitance retention of 123% even after 9000 cycles in aa safe voltage range from 0 V to 1.45 V. These results definitely imply the promising prospect of NiMoO 4 NR electrodes for application in supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2020
·
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
·
纳米材料
·
能源化学
·
固态储氢
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金属氢化物
·
催化材料
·
理论计算
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·Vol. 60
·期 34
·14998-15011
·
IF 3.9
Yu Zhou,Jiang Qin-Fu,Song Sheng-Nan,Liu Jin-Shan,Dong Yu-Wei,Ren Yu
Developing an efficient non-noble metal catalyst to accelerate the oxygen evolution reaction (OER) is essential for enabling the widespread use of electrochemical water splitting. In this work, we proposed a strategy of anion–cation dual doping to fabricate Fe and S dual-doping NiMoO 4 one-dimensional nanorods on nickel foam (Fe-NiMoO 4 -S/NF) through a simple preparation method. The combination of experimental results and theoretical calculations demonstrates that the simultaneous incorporation of both Fe and S can effectively regulate morphology and electronic structure, enhance charge transfer, increase the exposure of active sites, and optimize the adsorption of OER intermediates. The optimized Fe-NiMoO 4 -S/NF reveals excellent OER activity and structure stability, achieving a low overpotentials of 255 mV at 50 mA cm⁻ 2 in alkaline solution (1.0 M KOH) and 292 mV at 50 mA cm⁻ 2 in simulated alkaline seawater (1.0 M KOH + 0.5 M NaCl). Furthermore, the Fe-NiMoO 4 -S/NF maintains robust stability at high current density for 100 h and has small Tafel slopes of 66.0 and 78.1 mV dec⁻ 1 in alkaline solution and simulated alkaline seawater, respectively. In addition, overall water splitting at 10 mA cm⁻ 2 is achieved with an exceptionally low cell voltage of 1.54 V using the Fe-NiMoO 4 -S || Pt/C configuration. Thus, this study provides a significant guideline for the development of non-noble metal OER electrocatalysts through anion–cation dual-doping strategy. Graphical abstract A novel Fe and S dual-doped NiMoO4 one-dimensional nanorods on nickel foam (Fe-NiMoO4-S/NF) were designed for boosting the oxygen evolution reaction activity.
研究领域:
电化学
·
材料科学
·
催化
·
纳米技术
·
能量转换
✓ 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）