SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Mingxia Jiang,Yuyin Lin,Liyuan Xu,Zhihang Chen,Junxian Wu,Yong Yuan,Lihua Zhou
Extracellular respiratory bacteria (ERB) assume a significant role in biological and environmental remediation, so the rapid detection of ERB is essential to monitor its biological repair process. This study developed a microfluidic colorimetric biosensor for rapid and sensitive detection of ERB model strain Shewanella oneidensis MR-1. In the process of separation and enrichment of bacteria based on immune magnetic nanoparticles (MNPs), the biological signal is significantly amplified by the excellent peroxidase activity of flower-like CoOOH (FL-CoOOH). Firstly, immune MNPs, samples and immune FL-CoOOH were mixed and incubated within the microfluidic chip’s channel. Magnetic capture in the separation chamber yielded MNP-bacteria-CoOOH complex. Then, 3, 3′, 5, 5′-tetramethylbenzidine (TMB) substrate was added to make the FL-CoOOH nanozyme catalyze the formation of yellow product. Finally, the target bacteria in the microplate were quantitatively detected. Based on the excellent simulated enzyme activity and stability of FL-CoOOH, the detection can be completed within 45 min after the introduction of the microfluidic chip. The detection was 5×10 1 ∼5×10 6 CFU/mL. Compared with the previously reported colorimetric sensors for MR-1, the sensitivity was increased by 99.54 % to 23 CFU/mL. This study uniquely integrates optical sensors and microfluidic technology for rapid ERB detection with enhanced portability. The design of biosensor can facilitate further investigations into extracellular respiration mechanisms and rapid ecological environment restoration applications.
研究领域:
生物技术
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环境科学
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分析化学
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微流控
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高影响因子
Surfaces and Interfaces
·
2026
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IF 6
Yao Lu,Cheng Cheng,Xiangchi Guo,Jingzhi Wu,Jingru Qu,Shihai Cao
CoOOH/g-C3N4 Z-scheme heterojunction is synthesized for PMS activation. • Sustained Co2+/Co3+ redox cycle promotes stable PMS activation. • The synergistic catalytic system exhibits excellent pollutant removal capacity. To address the challenges of high carrier recombination rate and insufficient active sites in the photocatalytic activation of peroxymonosulfate (PMS) system, this study reports the in situ synthesis of a CoOOH/g-C 3 N 4 Z-scheme heterojunction via an interface regulation strategy, identified the synergistic “Z-scheme charge transfer-PMS activation” mechanism, and realized efficient degradation of sulfamerazine (SMR). Experimental characterization and theoretical calculation confirmed that the CoOOH and g-C 3 N 4 not only induce a Z-scheme charge transfer pathway to preserve strong redox capacity, but also elevate the oxygen vacancies concentration in CoOOH. Z-scheme heterojunction significantly enhances the visible light response capability and improves the separation and migration efficiency of photogenerated electron-hole pairs. Among the synthesized photocatalysts, CoOOH/CN-10 demonstrated the optimal catalytic performance. Radical trapping experiments revealed that the degradation process was primarily driven by electrons (e ⁻ ) and singlet oxygen ( 1 O 2 ), while superoxide radicals (•O 2 ⁻ ) and hydroxyl radicals (•OH) played a secondary role. This work not only presents an efficient catalyst for PMS activation but also provides valuable insights into the design of Z-scheme photocatalyst for aquatic pollutant remediation. Download: Download high-res image (227KB) Download: Download full-size image
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JOURNAL OF NANOPARTICLE RESEARCH
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2013
·Vol. 16
·期 1
·1-7
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IF 2.175
Wang Minmin,Ren Wanzhong,Zhao Yunan,Cui Hongtao
Nanostructured cobalt oxyhydroxide films were deposited on the indium tin oxide-coated glass substrates at room temperature by a unique chemical bath deposition process. The synthetic procedure included an oxidizing step using ammonium persulfate as oxidant and a deposition step using propylene oxide as precipitation agent. The obtained films were composed of 1.2–3.5 nm CoOOH particles and homogeneously distributed nano-cracks. The small-sized particles provided huge interface for the electrochemical reactions and the nano-cracks facilitated the access of electrolyte to the particles beneath the surface of films. Therefore, high specific capacitance of 520 F g −1 for the as-prepared film was achieved at the scan rate of 5 mV s −1 in 0.5 mol l −1 KOH aqueous solution. The films also presented other high electrochemical performances such as nearly 100 % Coulombic efficiency and high cycle stability of charge and discharge.
研究领域:
材料科学
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电化学
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DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Jiajia Zhang,Yongfei Li,Xue Gong,Yi Wang,Wensheng Fu
Green tea is a popular beverage and is widely consumed due to its taste and antioxidative polyphenols. Herein, a smartphone-based colorimetric reader using cobalt oxyhydroxide (CoOOH) nanorings has been successfully applied to detect antioxidants in green tea with high reliability and robustness. By exploiting the oxidase-mimicking activity, the as-synthesized CoOOH nanorings replaces natural enzymes to directly catalyze oxidate colorless 3,3 ´ ,5,5 ´ -tetramethylbenzidine (TMB), while antioxidants can disintegrate CoOOH, leading to an antioxidant concentration-dependent color change. Benefiting from the CoOOH nanorings-based colorimetric strategy, a smartphone-assistant nanosensor was devised for portable and visual detection of antioxidants in green tea. The proposed method can be extended to visual detection of a diverse range of diseases by responding to their specific antioxidant, and thus provide a pivotal disease toolbox that is compatible for development at the point-of-care.
研究领域:
分析化学
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食品科学
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纳米技术
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DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Wang Sihong,Jiang Qu,Ju Shenghong,Hsu Chia-Shuo,Chen Hao Ming,Zhang Di,Song Fang
Unraveling the precise location and nature of active sites is of paramount significance for the understanding of the catalytic mechanism and the rational design of efficient electrocatalysts. Here, we use well-defined crystalline cobalt oxyhydroxides CoOOH nanorods and nanosheets as model catalysts to investigate the geometric catalytic active sites. The morphology-dependent analysis reveals a ~50 times higher specific activity of CoOOH nanorods than that of CoOOH nanosheets. Furthermore, we disclose a linear correlation of catalytic activities with their lateral surface areas, suggesting that the active sites are exclusively located at lateral facets rather than basal facets. Theoretical calculations show that the coordinatively unsaturated cobalt sites of lateral facets upshift the O 2p -band center closer to the Fermi level, thereby enhancing the covalency of Co-O bonds to yield the reactivity. This work elucidates the geometrical catalytic active sites and enlightens the design strategy of surface engineering for efficient OER catalysts.
研究领域:
材料科学
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催化
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电化学
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Huilin Niu,Lili Gao,Mingming Liu,Yuqi Zou,Jiaoli Wang,Guowen Hu,Jun Jin
Enhancing carrier separation and transport efficiency to achieve efficient water oxidation reaction is an important issue in photoelectrochemical (PEC) water splitting field, and introducing hole transfer layer (HTL) is an effective strategy to improve it. However, the difficulty of charge transfer between HTL and oxygen evolution catalyst (OEC) is a problem unresolved. To ameliorate the situation, we choose CoOOH as HTL and the metal–organic coordination compound constructed by 4,5-Imidazoledicarboxylic acid (IA) and Co/Ni ions as OEC. Using the interfacial coordination bonds as carrier transfer channels, the holes were rapidly extracted from HTL to OEC containing abundant active sites and participate in oxidation reaction. In consequence, the unique design results in a photocurrent density of 2.97 times that of α-Fe 2 O 3 at 1.23 V RHE for the IACN/CoOOH/Fe 2 O 3 . This study reveals how the advisable design of photoanode promotes interfacial charge transfer and provides a valuable reference for the design of composite photoanode.
研究领域:
材料科学
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能源化学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Shixue Liu,Zhuo Jiao,Chengcai Li,Tong Xu,Guojin Liu,Hailin Zhu,Yuhai Guo,Xueliang Jiang,Jiuming Li,Xiang Yin
Combining membrane separation with advanced oxidation technology can make the membrane self-cleaning, extending its service life. However, the preparation of composite membranes with excellent catalytic ability, self-cleaning performance, and stability remains a key research direction. In this study, a PTFE composite membrane with peroxymonosulfate activation self-cleaning ability was successfully prepared by in-situ growth of CoOOH and ZIF-67 on the surface of a l -DOPA/PEI modified PTFE membrane. The as-prepared membrane is superhydrophilic and has significant superoleophobic surfaces underwater, the separation efficiency of the as-prepared membrane for multiple oil-water emulsions exceeded 98.4 %. Meanwhile, the effective degradation of several organic dyes under visible light was simulated, with still high degradation efficiency (>99 %) after 10 cycles. Overall, this study puts forward a approach towards self-cleaning membranes based on PTFE material; the resulting composite membrane's high separation efficiency, stability under repeated use conditions as well as its self-cleaning ability position it as an attractive candidate for long-term wastewater purification applications.
研究领域:
材料科学
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环境工程
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高影响因子
RSC Advances
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2020
·Vol. 10
·期 65
·39909-39915
·
IF 3.119
Lin-Nan Zhou,Lan Yu,Cai Liu,Yong-Jun Li
Binary cobalt and nickel phosphides have been widely developed owing to their remarkable activities for the oxygen reduction reaction (OER) as well as their low cost. However, the OER active sites of binary cobalt and nickel phosphides are still controversial. Here, we use a CoNiP nanocage as a model catalyst and systematically investigate the correlation between the composition and the OER activity, clarifying how the ratio of CoOOH/NiOOH affects the OER activity. With the increase of the atomic ratio of Ni/Co (y/x, 0 < y/x < 3.5), the amount of NiOOH generated during the OER always increases; and the CoOOH initially increases and subsequently decreases, showing a similar changing tendency to the OER activity of CoNiP. When y/x = 1.5, CoNiP has the best OER activity with an overpotential of 278 mV at a current density of 10 mA cm−2 and a low Tafel slope of 67 mV dec−1. All tested CoNiP catalysts show better catalytic activity than pure CoP, indicating that the catalytic activity of CoNiP should be attributed to the synergistic effect of CoOOH and NiOOH rather than exclusively to CoOOH or NiOOH. This study clarifies the origin of the catalytic activities of CoNiP, helpful for designing high-efficiency CoNiP catalysts.
研究领域:
材料科学
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电化学
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Hao Chen,Jia Song,Xin Long,Huanhua You,Yanhong Weng,Danni Liu,Yuanfeng Liao,Jiujun Zhang,Jing-Li Luo,Xian-Zhu Fu
It remains challenges to efficiently convert carbon-based fuels such as methanol from CO 2 into electrical energy while without CO 2 greenhouse gas emission. Herein, a CO 2 -emission free direct methanol fuel cell (DMFC) has been realized through using unique Pt-CoOOH/nickel foam anode with high electro-catalytical selectivity, activity and stability. The DMFCs demonstrate simultaneous production of 18 mol of formate for every 1 kWh of electricity output with peak power density of 49.3 mW cm −2 and high selectivity of formate value-added chemicals up to 96 %. Moreover, this simple procedure does not consume energy while output electricity compared to the traditional formate production. It either does not use the toxic feedstock of CO and the reaction conditions are very mild. The in-situ Raman test indicates that CoOOH acts as an auxiliary active site to promote the conversion of *HCO to *HCOOH and improve the selectivity of formate. In-situ IR tests and density functional theory (DFT) calculations confirm that methanol tends to be oxidized selectively into formate rather than complete-oxidizing into CO 2 . This study achieves clean and efficient utilization of carbon-based fuels to co-generate electrical energy and value-added chemicals while no CO 2 greenhouse emission, even realize the “negative carbon” cycle.
研究领域:
能源科学
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环境科学
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
·
IF 21.1
Yuwei Xiong,Chen Deng,Wei Ji,Yifei Sun,Richen Lin
Although cobalt (Co) and phosphorus (P) are widely employed to enhance the electrooxidation performance of Ni-based electrocatalysts, their synergistic roles in regulating metal-site activation and interfacial reconstruction during 5-hydroxymethylfurfural (HMF) oxidation remain unclear. Herein, by comparatively studying the electrochemical behavior and structural evolution of Ni-P/NF and Ni 0.8 Co 0.2 -P/NF during the HMF oxidation reaction (HMFOR), we identify a Co-P synergistic reconstruction mechanism that governs the dynamic formation of active interfaces. Ni 0.8 Co 0.2 -P/NF delivers a low onset potential of 1.33 V (vs. RHE) in 50 mM HMF-containing alkaline electrolyte and achieves a high current density of 900 mA cm −2 at 1.60 V (vs. RHE), with a Faradaic efficiency of 97 % toward FDCA. Mechanistic studies reveal that Co modulates the initial electronic structure of Ni sites, while P stabilizes the evolution of Co species into CoOOH under reaction conditions. The in situ generated CoOOH dynamically couples with neighboring Ni sites, thereby promoting the low-potential reconstruction of Ni 2+ into active NiOOH. In situ Raman spectroscopy further confirms the formation of a stable NiOOH/CoOOH composite active interface during HMFOR, which accounts for the reduced onset potential and accelerated reaction kinetics. This work highlights the importance of coupling static electronic modulation with dynamic electrochemical reconstruction, providing mechanistic insights for the rational design of multicomponent electrocatalysts for biomass-derived 5-hydroxymethylfurfural electrooxidation.
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高影响因子
Materials Express
·
2019
·Vol. 9
·期 7
·741-748
·
IF 1.465
Chi Kuan-Neng,Hu Rong,Yang Yun-Hui
In this work, a neoteric photoelectrochemistry (PEC) sensor on account of perylenediimide (PDI) by coupling with ascorbic acid (AA) responsive decomposition of cobalt oxyhydroxide (CoOOH) nanosheets was developed. PDI is a kind of organic photoelectric material with strong photoelectrochemical
properties in aqueous solution. When the surface of the PDI is modified by CoOOH, the photoelectric properties of the PDI could be effectively decreased. However, when AA is present, CoOOH is reduced to Co2+ while the photoelectric properties of PDI are restored. The photoelectric
sensor constructed thereby exhibits high selectivity and transient response, and is simple in operation, low in cost and short in time, and provides a novel detection method for small molecule ascorbic acid. In the case of a signal-to-noise ratio of 3, the detection limit is 33.4 nM. This
paper opens a new PEC method to detection of AA.
研究领域:
分析化学
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生物传感
·
材料科学
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DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 28
·2754-2760
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IF 3.532
Yuling Li,Xiaotong Wu,Zixuan Wu,Mingmin Zhong,Xiaoping Su,Youai Ye,Yan Liu,Lei Tan,Yong Liang
The identification of synthetic antioxidants has considerable significance in food safety. Here, we described the development of a colorimetric sensor array for rapid detection of eight antioxidants in food through the redox reaction between CoOOH and antioxidants in the presence of colorimetric signal indicators. The CoOOH nanoflakes exhibited high catalytic oxidation activity and can independently catalyze oxidation signal indicators showing different colors. The color reaction was inhibited to different degrees in the presence of antioxidants, which resulted in distinct signal response patterns for their discrimination. The method showed good linearity in the range from 50 to 1000 nM for butylated hydroxytoluene (BHT), butylhydroxyanisole (BHA), propyl gallate (PG) and tert-butyl hydroquinone (TBHQ). Moreover, different proportions of antioxidants were located in the middle pattern of each single antioxidant, and showed certain linear relationships among different concentration ratios. Finally, the proposed colorimetric sensor array was used for practical applications where TBHQ and BHT were detected in biscuits and sausages, and BHA and PG were detected in fried pork kebabs, respectively. The results were further confirmed by high-performance liquid chromatography, which demonstrated the great potential of the colorimetry sensor array for practical applications.
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PubMed
高影响因子
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