ACS Sensors
·
2025
·
IF 9.1
Xinhua Zhao,Xiaxia Xing,Zhenxu Li,Yi Zhang,Zhu Zhang,Tingting Wang,Dachi Yang
In the emerging ammonia (NH3) economy, both olfactory and visual sensing are desired for leakage detection, in which olfactory sensing enables a fast response and wide detection range, while visual sensing ensures high selectivity. However, little is reported on the sensing material as a mediator to synergistically combine the dual-modality NH3 sensing. Here, Co3[Co(CN)6]2 microcubes (Co–CN MCBs) mediators have been developed for olfactory and visual dual-modality NH3 sensing. In olfactory sensing, porous chitosan-decorated Co3O4/Co3[Co(CN)6]2 microcages (CS@Co–O/Co–CN MCGs) have been obtained via [Co(CN)6]3–-governed self-assembly, glycerol-assisted reduction, and Kirkendall effect-driven hollowing. Beneficially, MCGs exhibit a 1 s fast response (500 ppm) and a 0.5–10,000 ppm wide detection range at room temperature. In visual sensing, colorimetric sensing paper (CSP) incorporated with anthocyanin, Co–CN, and poly(vinyl alcohol) has been achieved, which presents 10–320 ppm visual NH3 detection through a pink-to-brown transition. Further, highly selective NH3 sensing has been acquired through machine learning-powered classification of MCGs’ response and CSP’s specific NH3 chromogenic behavior. Notably, combining dual-modality sensing has achieved desired NH3 detection due to the boosted NH3 adsorption on Co–CN MCBs’ active sites and the synergistic effect of their-mediated heterostructures. Practically, our dual-modality sensing device has been integrated to detect NH3 with reliable responses.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Yong-Chao Zhang,Caidi Han,Jian Gao,Jinting Wu,Xiao-Dong Zhu,Ji-Jun Zou
Electrocatalytic water splitting has received widespread attention. However, due to the slow reaction kinetics and complex electron transfer process, the oxygen evolution reaction (OER) occurring at the anode has become a bottleneck. Herein, the metal-defective Co 3- x O 4 was selected as the electron-acceptor carrier and Co 3- x O 4 /NiO was synthesized by a simple two-step method. The results show that Co 3- x O 4 /NiO has a low overpotential of 240 mV and 320 mV at 10 mA·cm −2 and 100 mA·cm −2 , a low Tafel slope of 64 mV/dec, and the electrochemical surface area (ECSA) of Co 3- x O 4 /NiO is as high as 1033.3 cm 2 . Moreover, the decrease in activity after the 60 h stability testing is negligible. Combining experiments and theoretical calculations, the high activity and stability of Co 3- x O 4 /NiO is attributed to the tunable electronic structure, and more electrons are transferred from NiO to Co 3- x O 4 which leads to the in-situ generation of more Ni 3+ as active sites. The Co 3- x O 4 /NiO with abundant of Ni 3+ can effectively regulate the oxygen-containing intermediates (OH*, O* and OOH*) with appropriate binding energy, reduce Gibbs free energy change of rate-limiting step, and accelerate OER reaction kinetics. This work provides an efficient strategy to generate and stabilize Ni 3+ active sites and confirms the key catalytic role of Ni 3+ in the OER process.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhiyong Bai,Lehui Liu,Zhoubin Lin,Kang Min Ok
A novel guanidinium-templated ultraviolet (UV) nonlinear optical zinc carbonate crystal, [C(NH2)3]2Zn(CO3)2 (GZCO), has been synthesized in a closed system at low temperatures. GZCO crystallizing in the tetragonal noncentrosymmetric nonpolar space group, P41212 exhibits a three-dimensional anionic framework constructed by interconnected [Zn6C6O32] 12-membered ring channels with inorganic CO3 triangles and ZnO4 tetrahedra. Notably, the anhydrous GZCO shows a very high thermal stability among guanidine-based hybrid NLO materials benefiting from the confinement effect of the organic cations within inorganic channels. The UV–visible transmittance spectrum reveals that GZCO has a short UV cutoff edge of 210 nm, corresponding to the large band gap of 5.9 eV. GZCO exhibits a mild second-harmonic generation efficiency of 0.5 × KH2PO4 with type-I phase-matching behavior.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Weizhen Zhang,Rui Zhao,Bing Bao,Shuang Liu,Chao Hu,Wei Ding,Huaili Zheng
Phosphorus (P) contamination has become a worldwide issue due to its adverse impacts on water security and human health. Additional research is required because the selectivity and adsorption capacity of P adsorbents continue to impede their practical application. Herein, a novel NaCe(CO 3 ) 2 /Fe 3 O 4 nanocomposite (NCF) with good magnetic properties were synthesized through a modified hydrothermal method for P removal from water. With an adsorption capacity of 86.69 mg P g −1 , the NCF demonstrates outstanding phosphate uptake efficiency. At low P concentrations, the removal rate exceeded 90.0%, and the residual P concentration was below 0.1 mg P L −1 . Notably, NCF demonstrated exceptional P selectivity in actual water containing multiple substances, with negligible interference from competing ions and humic acid (HA). The adsorption processes of NCF were well described by the pseudo-second-order kinetic model (PSO) and Langmuir isotherm model, corresponding to its kinetics and thermodynamics, respectively. The exhausted NCF can be regenerated and retain an effective phosphorus removal capability even after regeneration. Characterization results demonstrated that electrostatic attraction and ligand exchange were responsible for P adsorption, forming stable CePO 4 crystals with low solubility. Moreover, the NCF demonstrated some efficacy in removing typical organic and inorganic phosphorus.
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Frontiers in Chemistry
·
2018
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IF 4.155
Jiang Zi-Min,Xu Ting-Ting,Yan Cong-Cong,Ma Cai-Yun,Dai Shu-Ge
Here, we report our finding in the fabrication of novel porous urchin-like Ni2/3Co1/3(CO3)1/2(OH)·0. 11H2O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g−1 at a current density of 1 A g−1. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g−1 at 1 A g−1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g−1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.
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Micromachines
·
2026
·Vol. 17
·期 2
·247
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IF 3.5
Xueqi Wang,Yu Hong,Guohui Wu,Yujie Hou,Shengnan Zhao,Binbin Dong,Jianchun Fan,Jun Yu
Gas sensors based on metal oxide semiconductors (MOS) have attracted significant attention in monitoring of methane emission and leakage monitoring due to their high sensitivity, fast response time, simple structure and low cost. However, the high power consumption caused by long-term high-temperature operation of MOS sensors restricts their application in mobile and portable devices. In this study, MOF-derived Co3O4dodecahedrons for low-concentration methane detection at room temperature was prepared using Zeolitic Imidazolate Framework-67 (ZIF-67) as a template and with various calcination temperatures. Among them, the Co3O4-350 calcined at 350 °C exhibited the optimal CH4sensing performance at room temperature, with a response of Rg/Ra= 1.53 to 2000 ppm CH4. This enhanced gas sensing performance is attributed to the highest Co3+proportions and the largest specific surface area in Co3O4-350 nanomaterials, which provided more active sites for gas adsorption and reaction. To address the challenge of slow response speed and irrecoverability during CH4detection at room temperature, the Co3O4nanomaterials were printed onto a micro-heater plate (MHP) to form a MEMS gas sensor. By introducing a pulse heating mode to the MEMS sensor, the response and recovery time were significantly reduced to 26 s and 21 s, respectively. This enhancement improves both the efficiency and reliability of the MEMS gas sensor for early-stage detection of CH4leaks in various industrial applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
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IF 5.4
Feng Yang,Mengling Jiang,Linfeng Fan,Hao Pan,Pei Feng
Co-loaded CNT with high Co 2+ content of 61.07% exhibited enhanced nanozyme activity. • P2 possessed a safe Co-ion release content far below the threshold of 20 ppm. • P2 exhibited good well-rounded properties and excellent anti-inflammatory activity. Excessive reactive oxygen specie (ROS) is not conducive to bone repair, which is prone to generate during the initial hematoma inflammatory phase following poly( L -lactic acid) (PLLA) bone scaffold implantation and the potential inflammation caused by its acidic degradation products. This study proposed introducing cobalt (Co)-based nanozyme into the PLLA scaffold, and focused on improving the dispersion between nanozyme and the PLLA matrix as well as enhancing the activity of nanozyme itself for efficiently scavenging ROS. The Co was loaded on the surface of carbon nanotube (CNT) for achieving uniform dispersion, and then calcined under different atmospheres for enhancing nanozyme activity via regulating the Co 2+ /Co 3+ ratio and optimizing the electronic structure. It was found that the nanozyme that was calcined in an N 2 atmosphere followed by phosphorylation exhibited a superior ROS-scavenging ability, which was attributed to its high Co 2+ content of 61.07% that facilitating the redox cycling and the optimization of its electronic structure by P doping. As a result, the composite scaffold (P2) at a nanozyme loading of 2 wt% possessed superior intracellular ROS-scavenging ability and downregulation of key inflammatory cytokines compared to the pure PLLA scaffold. It also possessed good cytocompatibility for cell adhesion and proliferation, and exhibited upregulated expression of the pro-angiogenic VEGF factor. Download: Download high-res image (228KB) Download: Download full-size image Co-based nanozyme was engineered by promoting dispersion and optimizing the Co 2+ /Co 3+ ratio for highly efficient SOD and CAT, and was used to endow the PLLA bone scaffold with good ROS-scavenging and cytocompatibility.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Hui-Juan Wang,Bing-Hao Wang,Xiao-Yuan Hu,Sha Bai,Lang Chen,Shuang-Feng Yin
Cu content tunes site occupancy (octahedral or tetrahedral) for active site design. • Cu-Co 3 O 4 -7% induces higher spin Co 3+ , weakens Co–O, boosts O latt reactivity. • Cu-Co 3 O 4 -7% achieves complete CO conversion at 150 °C via O latt -mediated mechanism. • Linking occupancy, spin, bond length to performance for O latt catalyst design. Metal doping represents an effective strategy for modulating the electronic structure of cobalt spinel oxides and tailoring catalytic performance. However, the precise site occupancy of dopants in Co 3 O 4 lattice, octahedral versus tetrahedral, remains a subject of debate, hindering a mechanistic understanding of the promotional role of metal doping. In this study, by adjusting the doping amount of Cu (Cu-Co 3 O 4 -x%, x represents the amount of doped Cu), site-specific incorporation of Cu into either octahedral or tetrahedral sites of Co 3 O 4 was precisely controlled. The resulting Cu-Co 3 O 4 -7% achieves the highest CO oxidation activity under a high gas hourly space velocity. It is revealed that Cu doped in octahedral sites promotes the transition of Co 3+ from low spin to higher spin states. This spin-state transition weakens the Co 3d−O 2p interaction, facilitates lattice oxygen mobility, optimizes CO adsorption, and collectively enhances CO oxidation. This work provides a targeted approach for regulating the Co 3+ spin state and elucidates its critical role in molecular activation processes.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zewei Hao,Pengkun Wei,Yang Yang,Jingyu Sun,Yunhua Song,Donggang Guo,Lu Liu
Eminent OER electrocatalysts occupies a vital position for hydrogen produced from water splitting. Up to now, sulfides with spinel structure have been considered as the most promising electrocatalysts to replace noble metal catalysts, but generally their catalytic activities are still unsatisfactory. Based on above situation, we used one-step solvothermal method to synthesis two CuCo 2 S 4 nanosheets by introducing two different surfactants. Two CuCo 2 S 4 nanosheets both show outstanding catalytic properties for OER. Specifically, CuCo 2 S 4 CNS exhibits the best OER performance with a low overpotential of 269 mV at a current density of 10 mA cm −2 and a small Tafel slope of about 41 mV dec −1 in 1.0 M KOH. The CV scanning and chronoamperometry tests also show its excellent stability. XPS analysis reveals the introduction of Cu ions into Co 3 S 4 lattice improve the relative concentration of Co 3+ on CuCo 2 S 4 nanosheets surface, which makes the catalytic performance get extensively improvement.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Hao Gu,Qin Zhong,Yiqing Zeng,Shule Zhang,Yunfei Bu
The supercapacitive performance of high-rate capacity and long-term cycling stability is still a big challenge for electroactive materials. Herein, Ni and Zn co-substituted Co carbonate hydroxide (NiZn-CoCH) flowers array is self-assembled on nickel foams (NFs) using l -ascorbic acid as a nanostructure inducer. The NiZn-CoCH flowers, consisting of silk-like nanosheets, are deservedly large electrode-electrolyte contact area and suitable ion-diffusion channel. The nanostructure and Ni and Zn co-substitution significantly improve energy storage performance. This electrode exhibits a high specific capacitance of 2020.8 F g −1 at 1 A g −1 with high-rate capacity (remain 80.2% at 10 A g −1 ) and 5000-cycle stability (almost unchanged after 1500 cycles at 10 A g −1 ). Additionally, an assembled asymmetric supercapacitor (ASC) device of NiZn-CoCH//activated carbon (AC) achieves a high energy density of 29.6 Wh kg −1 at a power density of 375 W kg −1 and only a 0.5% decrease of the capacitance after 2500 cycles. This facile and novel preparation method, using l -ascorbic acid, may be promising for industrial production of electroactive materials for the high-performance energy storage and conversion devices.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Mingshu Xiao,Dazhang Yang,Yuhua Yan,Yanping Tian,Mao Zhou,Meifeng Hao,Rui Cheng,Yuqing Miao
The Co 3 (VO 4 ) 2 multilayer nanoplates [Co 3 (VO 4 ) 2 -MNs] and Co 3 (VO 4 ) 2 ultrafine particle-comprised nanospheres [Co 3 (VO 4 ) 2 -UPNs] were prepared for the oxygen evolution reaction (OER). They are synthesized by a simple hydrothermal reaction using ethylenediaminetetraacetic acid and polyvinyl pyrrolidone as dispertants and pretectants. With the help of multi-walled carbon nanotubes (MWCNTs), the Co 3 (VO 4 ) 2 -MNs and Co 3 (VO 4 ) 2 -UPNs were immobilized respectivtly onto the surface of glassy carbon electrodes (GCEs). By comparison, the GCE–Co 3 (VO 4 ) 2 -MN/MWCNT exhibits higher performance of OER electrocatalysis and better stablity than the GCE–Co 3 (VO 4 ) 2 -UPN/MWCNT in the alkali electrolyte of 1 M KOH due to its higher surface roughness. The high surface free energy of Co 3 (VO 4 ) 2 -MNs is helpful for their immobilization on elelctrode surface, leading a better stability. The work shows that the noble metal-free electrocatalysts can lower the energy barrier and improve the energy efficiency for electrochemical water splitting to generate hydrogen.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Hongliang Dai,Pengjie Zhou,Shenming Yang,Lili Yang,Hongye Bai,Cui Dai,Guohai Xu,Weiqiang Fan
Electrocatalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is significant for the sustainable production of value-added chemicals. Active sites of catalysts could enhance the activity and selectivity of the HMF oxidation reaction (HMFOR), but the self-healing ability of active sites has been commonly ignored. In this work, Co(OH)2/Ni-MOF was successfully fabricated for efficient oxidation of HMF to FDCA under mild conditions. Electrochemical and cyclic stability experiments demonstrated the high self-healing properties of the dual active sites (Co3+/Ni3+). So, the retention rate of FDCA yield can still reach 98.5%, even after 90 days. HMFOR was further coupled with 4-nitrophenol hydrogenation, which promotes the yield and Faradaic efficiency of FDCA to about 100%. Therefore, this study explores the self-healing properties of species and provides new insights for designing efficient catalysts.
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