ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Danfeng Jiang,Zhenyu Chu,Jingmeng Peng,Jingyi Luo,Yangyang Mao,Pengqi Yang,Wanqin Jin
Currently, most metal oxides- or hydroxides-based and non-enzymatic sensors require a high alkali concentration in the working environment. Here, we designed a novel non-enzymatic sensor based on a 3D nanostructured Co(OH) 2 /rGO film to address this issue. The architecture of the hybrid film was in-situ constructed by the dense assembly of 200 nm flower-like Co(OH) 2 crystals bridged by rGO nanosheets . This structure possessed an extremely large specific surface area and an excellent conductivity which were beneficial for adsorbing OH to produce oxidative CoOOH or CoO 2 , even in a low alkaline condition. This material was able to mimic the functionality of glucose oxidase to oxidize glucose to gluconolactone and exhibited a good sensitivity at a wide alkaline range from 5 × 10 −3 to 1 mol L −1 NaOH solution. Moreover, this sensor showed a wide linear range, excellent selectivity, reproducibility and stability for real blood analysis.
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ACS Nano
·
2025
·
IF 16
Qu Jiang,Sihong Wang,Ziyang Sheng,Chaoran Zhang,Haoyue Zhang,Haofei Wu,Pan Liu,Peng Fan,Fang Song
Traditional electrochemical redox assessments offer insights into material properties for charge storage and catalytic kinetics but often fail to link these to specific surfaces, obscuring the structure–performance relationship. Here, we reveal the facet-dependent electrochemical redox behaviors and their connection to oxygen evolution reaction (OER) catalysis using Co(OH)2 nanosheets and nanorods as models. By correlating redox charge storage capacity and kinetics with distinct exposed surfaces, we uncover diffusion-controlled redox processes on the basal surface and non-diffusion-controlled behavior on the lateral surface and further utilize the distinct redox charging kinetics to differentiate the two. Integrated microscopic, spectroscopic, and electrochemical analyses reveal redox-active regions with a thickness of ∼12 Co atoms on the lateral surface and 85% Co atom equivalent extension on the basal surface, yielding benchmark redox charge capabilities of 3.04 mC cm–2 for the lateral surface and 0.35 mC cm–2 for the basal surface. By linking the surface-specific redox charges to catalytic performances, we find that the catalytic activity correlates with the lateral surface exclusively, corresponding well with previous demonstration of the catalytic reactivity of the lateral surface and the inertness of the basal surface. This work clarifies dynamic, heterogeneous, and anisotropic redox behaviors and offers a fast, reliable, and simplified method to probe the facet-specific redox and catalytically active surfaces electrochemically.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Zufeng Qiu,Kexin Yang,Zijian Huang,Hongsheng Zhao,Zhiwei Lin,Qin Kuang,Zhaoxiong Xie
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has emerged as a superior technique for detecting small molecules, owing to the strategic utilization of inorganic nanomaterial matrices. Despite the impressive capabilities of various novel matrices, the underlying interaction mechanisms between inorganic matrices and analytes remain largely unexplored. In this study, we synthesized Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, Co 3 O 4 /Co(OH) 2 heterojunctions, and Co 3 O 4 +Co(OH) 2 composites via a facile one-pot method. Amino acids were selected as model analytes for performance evaluation. Notably, the Co 3 O 4 /Co(OH) 2 heterojunctions significantly enhanced signal intensity and lowered detection limits to the parts-per-billion (ppb) level, outperforming Co 3 O 4 nanocubes, Co(OH) 2 nanosheets, and Co 3 O 4 +Co(OH) 2 composites. The detection results for environmental pollutants, especially in solutions containing real samples, highlight the outstanding performance of the heterojunction material as a matrix. Further characterization indicates that the formation of the heterojunction enhances nanoparticle dispersion and promotes the separation of photogenerated electron-hole pairs. Consequently, more photogenerated charge carriers can be transferred to the target analytes, facilitating their charging ability and ultimately enhancing signal intensity in MALDI-TOF MS. These results clearly demonstrate that the enhanced photocatalytic performance directly drives the improvement of MALDI-TOF MS performance, excluding interference from other factors. Thus, this study successfully combines photocatalytic mechanisms with MALDI-TOF MS mechanisms, providing new insights into the enhancement of MALDI-TOF MS performance. Additionally, it offers a new detection method for environmental pollutants.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4439-4448
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IF 2.817
Huang Xiangjin,Li Jianwen,Xie Chunsheng,Zhang Huasheng,Wei Shoulian,Lai Wenfeng,Xian Shaoling,Huang Sicong
Herein, a nanocomposite comprising polyvinyl pyrrolidone (PVP) and cobalt(II) hydroxide (Co(OH) 2 ) nanoparticles (PVP–Co(OH) 2 ) was synthesized via a hydrothermal method and used for detection of Cu(II) ions. Using PVP grafted nanosized Co(OH) 2 as a surfactant could decrease the aggregation and reduce the particle size. The conducted morphology investigations showed that PVP–Co(OH) 2 nanocomposite was composed of small spherical particles with a diameter of 40–80 nm that could accelerate mass diffusion and favor the deposition-stripping process of Cu(II) ions. High catalytic activity of Co(OH) 2 and good affinity of PVP to Cu(II) ions synergistically enhances sensing performance of the PVP–Co(OH) 2 nanocomposite-modified electrode than Co(OH) 2 - and PVP-modified electrodes. A linear response was obtained for Cu(II) ion concentration over a range of 1.0–90.0 μg/L, with a detection limit of 0.26 μg/L (S/N = 3). The proposed electrode exhibited good performance in terms of selectivity, stability, and reproducibility. It was also employed to detect Cu(II) ions in water and food samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yu Tian,Xiaoru An,Xiaonan Du,Dalei Chang,Hong Li,Yue Hua,Xiuling Zhang,Jingsen Zhang,Lanbo Di
α-Co(OH) 2 has important applications in environmental, energy and catalysis applications. However, a complicated and harsh process is required for its production. Therefore, it is necessary to develop a rapid, facile, and green approach for the controllable synthesis of α-Co(OH) 2 . In this study, we successfully synthesized α-Co(OH) 2 supported on multiwalled carbon nanotubes (MWCNT) (α-Co(OH) 2 /MWCNT) by the plasma treatment of a mixture of cobalt nitrate and MWCNT in water without adding any other chemical reagents. The controllable synthesis of α-Co(OH) 2 was achieved only by adjusting the plasma conditions and support functionalization. The reduction of p -nitrophenol (4-NP) as a model using NaBH 4 was used to evaluate the performance of the obtained α-Co(OH) 2 /MWCNT catalysts. The results revealed that the sample prepared with 15 min of plasma treatment using H 2 /Ar as the working gas (α-Co(OH) 2 /MWCNT-15) had a good crystalline phase structure and showed excellent 4-NP reduction performance with a reaction rate constant as high as 1.97 min −1 . Structural characterization and electrochemical analyses of the different catalysts indicated that α-Co(OH) 2 /MWCNT-15 contains abundant defects, a large layer spacing, and abundant lattice sites for hydrogen adsorption, which are conducive to the adsorption of more active hydrogen species and 4-NP, and thus lead to significantly accelerated catalytic reduction of 4-NP.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenzhuo Li,Yuanyuan Chen,Yufeng Wang,Mengyi Wang,Lei Cheng,Lixian Sun,Puxuan Yan
Compared with micro-nano powder, the integral catalyst shows the advantage of easy recovery in practical applications. Aerogel exhibit a lightweight and porous skeletal structure, making it one of the excellent carrier options in integral catalyst. Here, the novel aerogel composite is prepared by sol-gel and freeze-drying, in which including chitosan, cellulose, carbon nanofiber and micron composite catalyst. Then, nano Co 2 B is in-situ loaded onto the surface of micron flower shaped Co(OH) 2 , forming the catalyst. The results show the hydrogen generation rate of Co 2 B@Co(OH) 2 is 8117.7 mL min −1 g −1 , higher than most of the published literatures, which is attributed to crystal and amorphous interface, nano structure and mass transfer pathway. Meanwhile, the hydrogen generation rate of the aerogel composite is 6022.8 mL min −1 g −1 , showing high exposure rate of active sites (74.2 %) and low mass loss rate (7.3 %), due to the chemical cross-linking between chitosan and glutaraldehyde, and porous and fibrous network skeleton formed between different components. The natural polymer-based aerogel exhibits the combined advantages of being biodegradable, recyclable, and serving as self-assembled micro-nano powder catalysts.
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Small
·
2021
·Vol. 17
·期 35
·2101720
·
IF 13.281
Yijie Wang,Aoshuang Li,Chuanwei Cheng
Developing highly active, cost-effective, and durable bifunctional oxygen electrocatalysts is an important step for the advancement of rechargeable Zn–air batteries (ZABs). Herein, an efficient bifunctional oxygen electrocatalyst of ultrathin Co(OH) 2 nanosheets supported on nitrogen-doped carbon nanoflake arrays (named as Co(OH) 2 @NC), is reported, which yields excellent bifunctional activity, i.e., a low overpotential of 285 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER), a high half-wave potential (0.83 V) for oxygen reduction reaction (ORR), and a low potential gap (Δ E ) of 0.69 V. The excellent bifunctional catalytic performance can be ascribed to the concerted efforts of cobalt hydroxide toward OER and nitrogen-doped carbon for ORR. The Co(OH) 2 @NC nanoflake arrays is further used as binder-free air cathodes for rechargeable Zn–air batteries, exhibiting a high specific capacity of 798.3 mAh g Zn −1 , improved stability (a working life of >70 h at 5 mA cm −2 ), as well as a reduced long-term charging voltage, which outperforms the counterparts of NC nanoflake arrays and Pt/C-based air cathodes. One step further, the Co(OH) 2 @NC nanoflake arrays on carbon cloth are directly used as binder-free air cathodes for flexible, solid-state ZABs, showing excellent performance under deformation as well.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Tongzhou Li,Xiao Lin,Hongjie Zhang,Feng Xie,Wen-Feng Lin,Zhigang Shao
Direct seawater electrolysis (DSE) is extremely promising for green hydrogen production as it avoids using scarce freshwater resources, but it faces inherent challenges including slow hydrogen evolution reaction (HER) kinetics at the cathode, active-site blockage by insoluble Mg 2 + /Ca 2+ hydroxides precipitation and chloride corrosion. Herein, we report a high performance HER electrode based on Pt@Co(OH) 2 nanoarrays supported on Nickel foam for DSE, where the dual-catalytic sites on Pt and Co adsorbed *H and *OH, respectively, efficiently promoting water dissociation. The electronic interaction between Pt and Co facilitated the desorption of *H and inhibited the adsorption of Cl - on the electrode. Moreover, positively charged Pt@Co(OH) 2 nanoarrays significantly suppressed Mg 2+ /Ca 2+ migration to the electrode surface, and the ordered pore structure enabled efficient bubble-induced removal of possible precipitation. A pH-asymmetric electrolyzer was assembled with the cathode that achieved a benchmark current density of 100 mA cm −2 with a low voltage of 1.675 V at 80 ℃, and it operated continuously for 1000 h at 100, 200, 500, 800 and 1000 mA cm −2 without significant degradation. This work provides a synergistic strategy to simultaneously overcome the persistent challenges of reactivity and stability of the cathode in DSE, enabling sustainable industrial-scale green hydrogen production.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xitao Li,Meilin Jia,Yanting Lu,Nan Li,Yan-Zhen Zheng,Xia Tao,Meilan Huang
BiVO 4 as a promising candidate photoanode material for PEC water splitting has been paid much attention due to its low cost, nontoxicity, high stability and narrow band gap energy of 2.4 eV. However, owing to its short carrier diffusion length and poor charge separation consequence, the achieved efficiency of the BiVO 4 photoanode is still limited. Herein, we addressed this issue by loading Co(OH) 2 onto as-prepared BiVO 4 to fabricate Co(OH) 2 /BiVO 4 heterojunction photoanode via a simple solution impregnation method, in which Co(OH) 2 as a modifier can increase interface charge separation efficiency from 44% of BiVO 4 to 92% of Co(OH) 2 /BiVO 4 . As a result, the water-splitting photocurrent density was significantly enhanced from 1.57 mA/cm 2 of BiVO 4 to 4.52 mA/cm 2 of Co(OH) 2 /BiVO 4 at 1.23 V vs. RHE under 1-sun illumination. Further, the Co(OH) 2 /BiVO 4 photoanode was assembled in tandem with a single sealed carbon-based PSC , and the resulting PV-PEC device showed a high STH efficiency of 4.6% and decent stability. The produced H 2 and O 2 gases were determined as ∼68 μmol/cm 2 /h and ∼34 μmol/cm 2 /h, respectively, corresponding to the 2:1 ratio of water splitting reaction with a faradaic efficiency of ∼98%.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Mengjiao Zhu,Jing Kong,Qing Li,Xinxin Liu,Jing Zhang,Tao Liu,Liqun Ren,Jing Zheng,Zhenyu Chu,Wanqin Jin
Aspiration pneumonia (AP), caused by the microinhalation of gastric contents, is easy to miss because of its nonspecific symptoms and is associated with a high mortality rate (46.1%) over a short disease course. Current diagnostic methods for aspiration pneumonia, including medical imaging and bronchoscopy, are difficult to use for onsite and rapid diagnosis because they require bulky and time-consuming equipment. In this work, we propose an ultrasensitive electrochemical immunosensor to achieve fast determination of the AP biomarker (pepsin) in the bronchoalveolar lavage fluid (BALF) of AP patients. This immunosensor works through the construction of heterogeneous Ag@Co(OH)2 NWs to simultaneously provide both high electrocatalysis and high conductivity. In terms of architecture, Ag NWs can contribute abundant active sites for antibody immobilization to achieve target capture ability while accelerating electron transfer. In addition, the uniformly distributed Co(OH)2 nanoparticles intensify the response signal because of their high redox capacity. Through the above synergetic effects, our immunosensor enables the recognition and reporting of trace amounts of pepsin in patients’ BALF within only 20 min, which is at least two times faster than that of clinical techniques. Moreover, the high diagnostic accuracy of the immunosensor is comparable to that of CT images from clinical AP patients. This facile immunosensor is promising for providing new insights into the early diagnosis of AP to guide clinical treatment onsite.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Mingyuan Chen,Yaxin Lv,Peilin Wu,Liuyan Dong,Xingquan He,Lili Cui
To obtain highly active electrocatalyst for the whole electrochemical water splitting is of importance to generate hydrogen. Co(OH) 2 is used as electrocatalyst towards OER, however, the performance can be improved further. Usually, to construct the interface and adjust the electronic environment of electrocatalysts are regarded as powerful ways to improve the activity. Herein, CeO 2 -Co(OH) 2 sheets supported on copper foam (CF) are fabricated by electrodeposition method. The morphology and the electron structure of metals are adjusted by changing the molar ratio of Co to Ce, thus, resulting in different electrocatalytic activity. The optimal hybrids of CeO 2 -Co(OH) 2 exhibits lower overpotentials of 188, 269 mV to reach 10 mA cm −2 towards HER and OER, respectively, and good stability. Notably, it is found that the electroactivity is extremely superior to that of bare CF as well as the counterparts in the literature. Also, we try to employ M(OH) 2 (M = Fe, Ni) to substitute Co(OH) 2 to investigate the effect of species of hydroxides on the electron interaction between CeO 2 and hydroxides, the XPS results indicate that Ce and Co shows stronger electron interaction compared to other two control hydroxides. As electrocatalysts for alkaline full water splitting, CeO 2 -Co(OH) 2 requires a cell voltage of 1.62 V to drive 10 mA cm −2 . Experimental results prove the advantages of the electron engineering and morphology control.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米材料
·
催化化学
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Zuozhu Yin,Min Li,Zihao Li,Yuanting Deng,Mingshan Xue,Yuhua Chen,Junfei Ou,Sheng Lei,Yidan Luo,Chan Xie
Traditional membranes are inefficient in treating highly toxic organic pollutants and oily wastewater in harsh environments, which is difficult to meet the growing demand for green development. Herein, the Co(OH) 2 @stearic acid nanocellulose-based membrane was prepared by depositing Co(OH) 2 on the nanocellulose-based membrane (NBM) through chemical soaking method, which enables efficient oil/water mixtures separation and degradation of pollutants by photocatalysis in harsh environments. The Co(OH) 2 @stearic acid nanocellulose-based membrane (Co(OH) 2 @stearic acid NBM) shows good photocatalytic degradation performance for methylene blue pollutants in harsh environment, and has significant degradation rate (93.66%). At the same time, the Co(OH) 2 @stearic acid NBM with superhydrophobicity and superoleophilicity also exhibits respectable oil/water mixtures separation performance (n-Hexane, dimethyl carbonate, chloroform and toluene) under harsh environment (strong acid/strong alkali), which has an excellent oil-water mixtures separation flux of 87 L·m −2 ·h −1 (n-Hexane/water) and oil-water mixture separation efficiency of over 93% (n-Hexane/water). In addition, this robust Co(OH) 2 @stearic acid NBM shows good self-cleaning and recycling performance. Even though seven oil-water separation tests have been carried out under harsh environment, it can still maintain respectable oil-water mixture separation rate and flux. The multifunctional membrane has excellent resistance to harsh environments, oil-water separation and pollutant degradation can be performed even in harsh environments, which provides a convenient way to treat sewage under harsh conditions efficiently and has great potential in practical application.
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