INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Tao Cong,Xiaoyu Wang,Xifeng Ding
Metal–air batteries, with high energy density and eco-friendliness, are crucial for sustainable energy. Although abundant and low-cost, spinel oxides, ideal for metal–air batteries, suffer from low conductivity, hindering electron transport and slowing electrocatalytic kinetics. In this work, NiCo2O4 (NCO) was embedded on carbon nanotubes (CNTs) via a hydrothermal method to form a composite catalyst (NCO-1CNTs), and subsequent annealing in nitrogen enhanced oxygen vacancy concentration in the spinel structure. In 0.1 M KOH, NCO-1CNTs achieves outstanding oxygen evolution reaction (OER) performance (η10 = 427 mV) and oxygen reduction reaction (ORR) performance (jL = 5.1 mA cm–2), surpassing NCO by 16.6% and 82.1%. The enhanced catalytic activity is attributed to the high conductivity of carbon nanotubes, which accelerates electron transfer. Additionally, carbon nanotubes prevent spinel oxide aggregation, increase active sites, and form a porous structure, enhancing oxygen species transport. Moreover, annealing NCO-1CNTs in a nitrogen atmosphere induces the spinel component to generate more oxygen vacancies, boosting catalytic performance. The resulting zinc–air battery delivers a power density of 68 mW cm–2 and exhibits stable performance over 100 h of charge–discharge cycling. This study delivers a low-cost, high-activity, stable bifunctional cathode catalyst, signaling great promise for commercial rechargeable zinc–air batteries.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 7
·1-9
·
IF 1.81
Nguyen Hung H.,To Nguyen V.,Tran Thu V.,Nguyen Ky V.,Luong Son T.,Nguyen Nga N. T.,Hoang Chung V.,Nguyen Hieu S.,Nguyen Nghia V.
The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g −1 at the current density of 50 mA g −1 , and the capacity was reduced to 29 mAh g −1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g −1 at 50 mA g −1 ; the capacity was lowered to 119 mAh g −1 after 100 cycles. The capacity of the composite at 100 mA g −1 , 200 mA g −1 and 300 mA g −1 was ca. 123 mAh g −1 , 93 mAh g −1 and 62 mAh g −1 , respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-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
Journal of Zhejiang University-SCIENCE A
·
2020
·Vol. 21
·期 1
·74-84
·
IF 1.49
Fang Yang-yang,Wang Xiao-zhong,Chen Ying-qi,Dai Li-yan
The Knoevenagel condensation reaction has wide applications ranging from the manufacture of basic chemicals to pharmaceutical intermediates. In this study, we developed an efficient and magnetic bimetallic NiCo 2 O 4 nanocatalyst by co-precipitation. When used in the Knoevenagel condensation between various benzaldehydes and malononitrile, the catalyst exhibited excellent catalytic performance with 99% conversion and 99% selectivity under mild conditions. It can be easily recovered with a magnet and recycled for 20 runs without significant loss of activity. We expect that the catalyst will find large-scale industrial applications.
研究领域:
催化化学
·
纳米材料科学
·
有机合成方法学
·
绿色化学
·
工业催化
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2020
·Vol. 63
·期 8
·1470-1477
·
IF 2.302
Gong LiuTing,Xu Miao,Ma RenPing,Han YingPing,Xu HongBo,Shi Gang
Transition metal oxide is a promising candidate for future supercapacitors due to its pronounced electrical properties and low cost. Unfortunately, the poor cycle stability and low capacitance due to the small lattice spacing and strong volume expansion in dense transition metal oxide impede its practical applications seriously. Herein, a nanoporous electrode of metal oxide has been prepared via the solvothermal and subsequent calcination process of MOF-74 (MOF=metal-organic framework), which shows outstanding cycle reversibility, excellent capacitance. Because of large surface areas with a nanoporous structure which is beneficial to the ion transport and relief to volume expansion. Three samples with different divalent metals (MOF-74-Ni, MOF-74-NiCo 2 and MOF-74-Co) were prepared by hydrothermal method. After a facile annealing process, the NiO, NiCo 2 O 4 and Co 3 O 4 with the large surface area and porous structure were easily obtained and further the electrochemical properties were investigated. As a result, the NiCo 2 O 4 electrode exhibits obviously high specific capacity (684 F/g) and excellent cycling stability (86% retention after 3000 cycles) compared with the monometallic oxides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ling-Xia Yun,Xin-Ran Shi,Tian-Bao Chen,Yu-Hang Gu,Meng Qiao,Hang-Tian Zhang,Jie-Xin Wang
Regarding the environmental and ecological hazards of waste plastics, the unexploited polyester resources promise to produce valuable chemicals and fuels by electrocatalytic upcycling in combination with alkaline hydrolysis. Herein, we propose a universal approach to synthesize carbon supported NiCo 2 O 4 nanoparticles (NPs) utilizing high gravity technology combined with heat treatment for electrocatalytic valorization of polyethylene terephthalate (PET). This route enables instantaneous and continuous precipitation of the composites including Co-NH 3 complex and Ni hydroxide on carbon in a rotating packed bed (RPB) reactor, and achieves ultrasmall and ligand-free NiCo 2 O 4 NPs (6 nm) with significantly improved dispersity after heat treatment. The as-prepared NiCo 2 O 4 NPs/C converts PET-derived EG to formate with a promising faradaic efficiency (FE) of over 90 % and a high productivity of about 4.5 mmol·cm −2 ·h −1 at 1.5 V (vs RHE). Furthermore, this strategy can also be extended to the preparation of other supported ternary oxide NPs for efficient electro-oxidation of PET hydrolysate.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Huanhuan He,Jia Zheng,Jian Su,Lian Xia,Yue Tang,Yuangen Wu
A novel aptamer LFA (Apt-LFA) strip is first constructed for ethyl carbamate (EC) detection, in which cationic polyethyleneimine (PEI) and anionic polyacrylamide (APAM) are used as double-capture agents. The black NiCo 2 O 4 nanoparticles (NCO NPs) encapsulated by EC1-34 aptamer are employed as recognition probes. The added EC will bind to EC1-34 aptamer on the probes, so that the test-line (T-line) immobilized with APAM can electrostatically capture the exposed NCO NPs. The control-line (C-line) sprayed with PEI can capture the excessive black recognition probes. The peroxidase-like activity of bimetallic NCO NPs is employed as signal amplification to improve the sensitivity of Apt-LFA strip. The naked eye discernible concentration of EC is 5 μg L −1 and the detection limit (LOD) is as low as 1.36 μg L −1 . The Apt-LFA strip has the advantages of strong stability, simplicity and low cost, which provide a new method for EC detection and offer a new way for designing LFA.
研究领域:
分析化学
·
纳米技术
·
即时检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xinying Han,Yutong Shan,Rui Wang,Shiyu Wang,Yang Zhao,Huan Wang
To satisfy the pressing demands for heavy metal ions (HMIs) detection, A novel sensor was developed to detect lead (Pb 2+ ) ions based on oxygen vacancy-rich NiCo 2 O 4 (NCO) nanoparticles and polyaniline (PANI) nanowires. The NCO/PANI nanocomposite was synthesized via a synergistic salt-assisted carbonization activation and conductive polymers doping strategy, which simultaneously introduced abundant oxygen vacancies and optimized the heterostructure interface. The NCO nanoparticles coupled with imine functional groups (-N=) on PANI create synergistic adsorption-catalytic sites for Pb 2+ . The sensitivity of the NCO/PANI-modified glassy carbon electrode (GCE) reached an impressive value of 14.96 μA·μM −1 , representing increases of 2.5-fold, 4.14-fold, and 24.9-fold compared to that of the NCO-modified GCE (5.99 μA·μM −1 ), PANI-modified GCE (3.616 μA·μM −1 ), and bare GCE (0.6 μA·μM −1 ), respectively. This performance results from oxygen vacancies accelerated electron transfer, redox pair interactions (Co 2+ /Co 3+ , Ni 2+ /Ni 3+ ), and enhanced Pb 2+ adsorption by complexation and pore confinement. The sensing platform achieves an ultralow detection limit of 0.001 μM (S/N = 3) and exhibits robust anti-interference against common coexisting interferences (Cd 2+ , Cu 2+ , Fe 2+ , Ni 2+ , Zn 2+ , Fe 3+ bisphenol A, catechol, hydroquinone, resorcinol), with satisfactory recovery (101 %–106.2 %) and excellent long-term stability in real water samples. This work not only establishes a robust foundation for optimizing material selection but also expands the horizon for the development of electrochemical sensing platforms.
研究领域:
材料科学
·
环境监测
·
电化学
·
纳米技术
·
分析化学
✓ 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）