JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 50
·期 6
·3030-3036
·
IF 1.774
Yang Qiuhe,Yuan Yongfeng,Chen Qiang
With SiO 2 spheres as the template and PPy as carbon precursor, a layer of amorphous carbon has been tightly coated on NiCoO 2 -CoOOH hollow burr nanospheres, forming a unique double-shelled hollow burr nanospheres structure. Carbon@NiCoO 2 -CoOOH presents a high discharge capacity (1334 mAh g −1 at a current density of 100 mA g −1 ), a stable cycling performance (912 mAh g −1 at the 600th cycle at 200 mA g −1 ), and a desirable rate capability when used as anode material for lithium-ion batteries. The outstanding electrochemical performance results from the synergy effect of the hollow burr nanosphere and the amorphous carbon shell. The hollow burr nanosphere endows NiCoO 2 and CoOOH with a high electrochemical activity and a good accommodation capability to volume change. The amorphous carbon shell remarkably reinforces the structure stability and electronic conductivity of NiCoO 2 and CoOOH.
研究领域:
材料科学
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纳米技术
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能源存储
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Dan Li,Zuquan Gan,Cailin Zhang,Xiuqiu Wang,Mingzhen Zheng,Xiaoyun Gao,Yue Huang,Youjun Fan,Shuifeng Zhang,Fuqin Zheng,Wei Chen
The exploration of sustainable approaches for plastic waste disposal has emerged as an urgent imperative task. This research presents an innovative and eco-friendly electrochemical route to degrade plastic waste, ethylene glycol (EG), into value-added formate. To this end, an interesting hollow FeOOH/CoOOH heterostructure is successfully fabricated for EG oxidation. The difference in work functions between FeOOH and CoOOH results in the establishment of a built-in electric field (BEF), which is beneficial for the adsorption of EG and *OH. As a result, the FeOOH/CoOOH demonstrates outstanding catalytic performance in the EG oxidation reaction (EGOR) with an exceptionally low potential of only 1.32 V at 10 mA cm -2 and a high Faraday efficiency of 92.19% for formate generation. Glycollic acid is identified as a pivotal intermediate in the EGOR by in-situ infrared spectroscopy. Theoretical computations disclose that the FeOOH/CoOOH heterostructure not only causes an upward shift of the d-band center but also largely enhances the *OH adsorption, thus speeding up the cleavage of the inert C-C bond and markedly facilitating the conversion of EG to formate. This research not only enriches the fundamental comprehension of the EGOR but also provides deep insights for the rational design of highly selective and active EGOR catalysts.
研究领域:
电化学
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催化
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材料科学
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环境科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Lili Zhao,Jiawei Zhou,Peipei Li,Shu Huang,Xiaohua Zhu,Youyu Zhang,Meiling Liu,Shouzhuo Yao
Human immunoglobulin G (HIgG) plays a significant role in diagnosing infections and monitoring autoimmune diseases. However, the development of sensitive and reliable sensing platforms remains a challenge. Based on the Ag 2 S/SnO 2 composites, a dual-mode sensing platform was developed using multifunctional CoOOH nanoflakes for the sensitive detection of HIgG through photoelectrochemistry (PEC) and colorimetry. In the PEC mode, Ag 2 S QDs boost the PEC activity of SnO 2 NFs and facilitate the subsequent antibody immobilization. Ascorbic acid (AA) captures holes in Ag 2 S/SnO 2 to enhance the photocurrent. CoOOH, acting as a secondary antibody label, forms a sandwich structure with the electrode. The loading of HIgG and CoOOH-Ab2 due to specific recognition of antigen-antibody, leads to the quenching of PEC signal. Various amounts of HIgG will bind with different amounts of CoOOH-Ab2, displaying a linear response within the range of 100 pg/mL∼10 μg/mL, with the detection limit of 2.2 pg/mL. In the colorimetric mode, CoOOH efficiently catalyzes the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB), and various amount of the sandwich biocomplexes formed with different HIgG levels lead to distinct color changes for visual detection. The linear response range is 500 pg/mL∼9.375 μg/mL with a lower detection limit of 0.29 ng/mL. The two independent modes with different mechanisms, based on the same PEC electrode, can validate each other and provide more scientific and reliable results in response to the targets. Thus, this dual-mode sensing platform for targets-induced signaling changes presents a novel strategy for bioanalysis and detection.
研究领域:
生物化学
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分析化学
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纳米技术
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免疫学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 7
·1-8
·
IF 5.479
Zhou Jiao,Ling Yu,Li Nian Bing,Luo Hong Qun
The authors describe a fluorometric and resonance Rayleigh scattering dual-mode scheme for detection of the activity and inhibition of alkaline phosphatase (ALP). The method utilizes (a) CoOOH nanoflakes, which have high resonance Rayleigh scattering activity and can strongly adsorb ssDNA, and (b) Co(II)-dependent DNAzyme assisted signal amplification. ALP specifically catalyzes the hydrolysis of ascorbic acid-2-phosphate to produce ascorbic acid which reduces CoOOH nanoflakes to Co(II) ion. The Co(II)-dependent DNAzyme is then activated by Co(II) ion, and this results in the cleavage of a substrate labeled with both a fluorophore and a quencher. Following hydrolysis, fluorophore and quencher become separated and the fluorescence measured at excitation/emission wavelengths of 490/518 nm recovers, while the RRS signal at 405 nm decreases. The method works on the 0.2 to 2000 U L −1 ALP activity range, and the detection limit is 0.05 U L −1 . The method was used to validate the mechanism of the action of two classical ALP inhibitors (EDTA and Na 3 VO 4 ). Conceivably, it can also be applied to screen for ALP inhibitors.
A bioprobe composed of cobalt oxyhydroxide (CoOOH) nanoflakes as the substrate and carrier, and Co 2+ -dependent DNAzyme containing guanine ribonucleotide (rG) and uracil ribonucleotide (rU) for circularly signal amplification is used for fluorometric determination of alkaline phosphatase (ALP) activity.
研究领域:
分析化学
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生物化学
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纳米技术
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Shi Gang Liu,Lei Han,Na Li,Yu Zhu Fan,Yu Zhu Yang,Nian Bing Li,Hong Qun Luo
The development of ratiometric fluorescent strategy is very significant and challenging in bioanalysis. Herein, graphitic carbon nitride (g-C 3 N 4 ) nanosheets and cobalt oxyhydroxide (CoOOH) nanoflakes are exploited for ratiometric fluorescence assay of alkaline phosphatase (ALP) activity. In the g-C 3 N 4 /CoOOH nanohybrid, g-C 3 N 4 nanosheets serve as a signal unit and the CoOOH nanoflakes function as a recognition element, and initially, the fluorescence of g-C 3 N 4 is quenched by the CoOOH nanoflakes. In the absence of target, the CoOOH nanoflakes of the nanohybrid system are able to oxidize o-phenylenediamine (OPD), and the resultant oxidation product (OxOPD) quenches the blue emission of g-C 3 N 4 and meanwhile emits orange fluorescence which acts as another signal element. However, an efficient redox reaction between ascorbic acid (AA) and CoOOH can cause decomposition of the CoOOH nanoflakes, and additionally, ALP can catalytically hydrolyze L-ascorbic acid-2-phosphate (AAP) to generate AA. Thus, in the presence of target, the CoOOH nanoflakes are destroyed by AA preferentially and the OPD is rarely oxidized to OxOPD, accompanied with strong blue emission of g-C 3 N 4 and weak orange fluorescence from OxOPD. Target-dependent dual-signal change made the ratiometric assay possible, and also AA-induced signal variation was investigated and attributed to the stronger reducing capacity of AA than OPD. The ratiometric sensing platform for ALP activity assay provides a new perspective for the applications of two-dimensional nanomaterials to develop novel and sensitive biosensors.
研究领域:
生物化学
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分析化学
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纳米技术
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Chuan-hua Yang,Yujie Cui,Zhengxi Chen,Yiluo Hu,Xuejun Pan,Siping Ji,Feng-zhi Jiang
Peroxymonosulfate (PMS)-based advanced oxidation processes (PMS-AOPs) currently face issues regarding transition-metal ion valence conversion and practical application in water treatment. To address them, we synthesized a CoOOH catalyst with a unique three-dimensional porous flower-like morphology for PMS activation to degrade 17α-ethinylestradiol (EE2) in wastewater. By adding PMS to CoOOH in small amounts, 95.68 % of EE2 (3 mg/L) was degraded within 9 min. The catalytic efficiency of CoOOH was considerably higher than those of a material synthesized via the conventional precipitation method and commercial Co 3 O 4 . CoOOH also exhibited a wide pH adaptability range, good cyclic stability, and a low cobalt ion leaching concentration. It demonstrated excellent PMS activation performance, chemical stability, and safety. Mechanistic studies revealed that numerous surface hydroxyl groups and abundant oxygen vacancies in CoOOH facilitated efficient electron transfer, rapidly achieved the Co 3+ /Co 2+ redox cycle, and generated a large amount of highly oxidative nonradical ( 1 O 2 ) and radical (•O 2 − ) species, thereby efficiently degrading organic pollutants. Finally, by combining PMS-AOPs with membrane separation, a CoOOH/PTFE membrane–PMS system was fabricated for continuous EE2 degradation in lake water; it could operate continuously for 24 h in treating 1.25 L of Dianchi Lake water (Kunming, Yunnan) containing 3-mg/L EE2 while maintaining an EE2 removal rate of 92.35 %. The synthesized CoOOH/PTFE catalytic membrane facilitated transition-metal ion redox cycling and efficient organic-pollutant degradation as well as enabled convenient catalyst recovery, thereby reducing secondary pollution in the degradation process. Overall, this research provides a feasible strategy for the practical application of PMS-AOPs.
研究领域:
环境科学
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化学工程
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催化
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水处理技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-8
·
IF 5.479
Liu Shi Gang,Luo Dan,Han Lei,Li Nian Bing,Luo Hong Qun
A hybrid material composed of guanine-rich single stranded DNA (G-rich ssDNA) and cobalt oxyhydroxide (CoOOH) nanosheets is used as a nanoprobe for fluorometric turn-on detection of ascorbic acid (AA). The CoOOH nanosheets function as a recognition component for AA. The G-rich ssDNA is used to produce a G-quadruplex, and the G-quadruplex/thioflavin T (ThT) complex acts as a fluorescent reporter. In the absence of AA, p-phenylenediamine (PPD) is oxidized to form oxPPD which has a dark red color. It causes the fluorescence of the G-quadruplex/ThT complex to be quenched. However, in the presence of AA, the CoOOH nanosheets of the nanoprobe are preferentially reduced by AA. Hence, PPD is not oxidized, and fluorescence is not quenched. A fluorometric turn-on method was developed based on these findings. It has a detection limit of 94 nM and works in the concentration range from 1 to 10 and 20 to 80 μM. This method was applied to the determination of AA in (spiked) fruit juice samples.
Schematic presentation of a fluorescent assay of ascorbic acid (AA) is established using a nanoprobe composed of guanine-rich single stranded DNA (G-rich ssDNA) and cobalt oxyhydroxide (CoOOH) nanosheets. It is based on competitive reduction of CoOOH by p-phenylenediamine (PPD) and AA. Thioflavine T (ThT) induces the formation of fluorescent G-quadruplex/ThT complex. The oxidized form of PPD (oxPPD) can quench the fluorescence via fluorescence resonance energy transfer (FRET), but AA suppresses quenching.
研究领域:
分析化学
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生物传感器
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纳米技术
·
荧光光谱
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Xiangzhi Dong,Yingying Wang,Peng Kang
Alkaline water electrolysis (AWE) offers a cost-effective pathway for green hydrogen production. However, AWE performance is often limited by the membrane. Herein, we synthesized in situ ZrO2/CoOOH-x nanoparticles and employed them as both the catalyst and filler for an AWE composite membrane, which achieved highly efficient water electrolysis. Furthermore, the ZrO2/CoOOH-10 membrane demonstrated optimal hydrophilicity with a contact angle of 38.9°, a surface roughness of 149 nm, an area resistance of 0.2 Ω cm2, and a hydroxide conductivity of 278.4 mS cm–1. In an AWE electrolyzer with NiFe foam/NiMo foam electrodes as the anode and cathode, respectively, the ZrO2/CoOOH-10 membrane reached 1777 mA cm–2 at the cell voltage of 2.0 V in 30 wt % KOH (80 °C), while maintaining stable operation for 150 h. Mechanistic studies revealed that CoOOH had dual synergistic effects on AWE performance: (1) enhanced hydrophilicity and (2) improved ionic conductivity and electrocatalytic activity. This work establishes a new method for designing multifunctional membranes, significantly advancing the development of AWE.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xian-Jun Niu,Yin-Lei Ma,Jun-Ya Gao,Zhi-Hua Lu,Ji-Sen Li
Rational design and construction of low-cost and efficient catalysts with robust structures are significant toward oxygen evolution reaction (OER), but their scalable synthesis remains a grand challenge. Herein, we report a combustion-assisted strategy for in situ growth of a RuO 2 /CoOOH heterojunction on cobalt foam, which can serve as both metal source and catalyst support. This simple route is favorable to large-scale industrial applications for hydrogen production in the future. Due to the synergistic effect of catalytically active phases, abundant heterointerfaces, and 3D porous structures, the targeted catalyst shows outstanding catalytic OER performance with a lower overpotential of 190 mV to reach a current density of 10 mA cm −2 , smaller Tafel slope of 47.5 mV dec −1 , and long-term durability for 50 h in 1.0 M KOH solution. When assembled as the anode toward full water splitting, the electrolyzer is capable of offering 10 mA cm −2 at a cell voltage of 1.47 V along with remarkable operational stability. Moreover, the device can be powered by a 1.5 V AA battery, wind, and solar energies, respectively. This work offers a feasible, rapid, and scalable approach for fabricating efficient robust catalysts for oxygen electrocatalysis.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Rong Gan,Qin Zhao,Yiling Ran,Quanlei Ma,Guidan Cheng,Ling Fang,Yan Zhang,Dingsheng Wang
The often-overlooked anions in raw materials have been less explored in terms of their promotion of the oxygen evolution reaction (OER) from the perspective of interfacial microenvironment regulation. In this study, we obtained the catalyst (CoOOH-NO 3 – ) by a one-step electrochemical reconstruction method, in which anion adsorption onto the active catalyst can optimize the interfacial microenvironment to promote OER under alkaline conditions. This is because the issue of excessive OH – adsorption within the inner compact layer of CoOOH can be ameliorated by the adsorption of anions, making it easier for active sites to branch OH – , thereby regulating the interfacial microenvironment. It was validated through a series of experiments that after tuning the interfacial microenvironment, reduction in the contact angle on the electrode surface facilitates the release of O 2 , promotes Co transformation to a higher oxidation state (Co(IV)) and lowers the onset potential for the reaction. Furthermore, the one-step synthesis method, along with the strategy of microenvironment regulation, applies to various metal salts (chlorides, acetates). Our research introduces a non-chemical synthesis method for the direct use of metal salts, providing a rational approach and insight for understanding how anion adsorption regulates interfacial microenvironment to enhance catalytic activity.
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
Energy Technology
·
2024
·
IF 3.6
Yongchao Hao,Ling Wang,Shuling Cheng,Huiya Cheng,Qianyun He,Lizhi Yi
Developing an efficient oxygen evolution reaction (OER) catalyst is the footstone of many electrochemical energy conversion devices. Herein, a cobalt–manganese bimetallic metal–organic framework (MOF) is developed as an efficient OER catalyst (denoted as Co 3 Mn 1 BDC). The Co 3 Mn 1 BDC nanosheets demonstrate advantages in specific surface area, pore size distribution comparing with monometallic Co BDC and Mn BDC. The performance investigations demonstrate that the doping of Mn in Co-based MOFs facilitates the electrochemical area, charge transfer efficiency, reaction kinetics, and turnover frequency. As a consequence, the Co 3 Mn 1 BDC exhibits a low overpotential of 289 mV at current of 10 mA cm −2 and a favorable Tafel slope of 56.8 mV dec −1 on glassy carbon electrode, which is better than IrO 2 . When the catalyst is loaded on Ni foam, the overpotential and Tafel slope are further decreased to 231 mV and 50.8 mV dec −1 . Moreover, the Raman spectrum confirms that the Co 3 Mn 1 BDC can be transformed into active CoOOH, suggesting the bright prospect in electrocatalysis devices as “precatalyst”.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chengming Long,Sirui Liu,Di Wang,Zhaoqi Lu,Qiulan Zhang,Qiong Gao,Mingyi Zhang,Xinzhi Ma
Photoelectrochemical hydrogen production technology holds promise for directly and swiftly generating green hydrogen, which is pivotal for human welfare; however, it faces challenges posed by the energetically sluggish oxygen evolution reaction (OER). Cobalt-based nitrides are considered excellent photoelectrochemically active in the OER (PEOER) catalysts, and their conductivity and photoconversion efficiency remain relatively low. This paper presents the fabrication of Ni-alloyed Co4N nanowire arrays on carbon cloth ((Co1–xNix)4N NWAs/CC) as PEOER catalysts. By analyzing advanced in situ Raman and X-ray photoelectron spectroscopy (XPS) results, we discovered that Ni not only enhances the conductivity of the catalyst but, more importantly, also creates more photoexcited Co2+ OER centers and favors its reconstruction to CoOOH to charge PEOER. Furthermore, nitrogen plays a critical role in transforming pyridinic nitrogen into other forms of nitrogen to stabilize the catalyst’s structure. These advantages endow (Co0.74Ni0.26)4N NWAs/CC with remarkable PEOER enhancement (988%), which drives the standard current density of 10 mA cm–2 with only a 283 mV overpotential along with good durability. This research provides insights into the PEOER mechanisms of cobalt-based transition metal nitrides, providing a way for designing next-generation PEOER catalysts.
研究领域:
材料科学
·
催化化学
·
可再生能源
✓ 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）