JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 10
·104502
·
IF 3.721
Guofeng Liang,Jilin Huang,Jiawang Li,Yinlong Wu,Guoju Huang,Yan Qi Jin,Hongbin Zeng,Hao Zhang,Jian Chen,Yanshuo Jin,Nan Wang,Fangyan Xie,Hui Meng
Transition metal and nitrogen co-doped carbon-based nanomaterial has been used as non-precious metal catalyst for oxygen reduction reaction (ORR). In this work, bamboo-like carbon nanotubes structured FeCo/N/C electrocatalyst is proved to show much enhanced performance compared with Co/N/C. MIL-53 (Fe) is used as iron source, MIL-53 (Co) is used as cobalt source and ZIF-8 as carbon source. The ball-milling procedure plays a significant role for the distribution of Fe and Co component and the formation of carbon nanotubes, which is believed to enhance the catalytic performance due to abundant electrocatalytic active sites and efficient mass transfer. The as prepared sample obtained by optimized preparation conditions exhibits outstanding ORR activity in acid solution with an onset potential of 0.96 V vs RHE (reversible hydrogen electrode), half-wave potential of 0.78 V, and a current density of 0.575 m A cm−2 at 0.7 V in a H2-O2 fuel cell test, which provides an ideal viewpoint to develop highly efficient catalyst for the oxygen reduction reaction. The high ORR performance could be attributed to the synergistic effect between Fe and Co and the high conductivity and mass transfer of the carbon nanotube.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 5
·294
·
IF 5.4
Xu Xiaowen,Liu Tiandi,Ma Tenghe,Li Tengfei,Wang Jing
A smartphone-assisted colorimetric sensing platform was developed for the sensitive detection of sulfites based on a cobalt single-atom nanozyme (Co-N-C). The nanozyme was synthesized via high-temperature pyrolysis of bimetallic Zn/Co-ZIF precursors, resulting in atomically dispersed Co active sites anchored on a nitrogen-doped carbon framework. Benefiting from the well-defined catalytic centers, Co-N-C exhibits exceptional oxidase-like activity, efficiently catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) into a blue product (oxTMB). The presence of sulfites triggers rapid discoloration through a dual mechanism involving reactive oxygen species (ROS) scavenging and the direct reduction of oxTMB. Under optimized conditions, the proposed assay demonstrates a wide linear range of 0.5–80 µM with a low detection limit of 0.066 µM. To eliminate potential interference from biothiols such as glutathione, a selective masking strategy using N-(2-hydroxyethyl)maleimide (HEMI) was introduced. Furthermore, integration with smartphone-based RGB analysis enables portable and instrument-free quantification. The platform was successfully applied to real food samples (white sugar, liquor, and bean vermicelli), yielding satisfactory recoveries of 92.6%-104.0%. This work highlights the potential of single-atom nanozymes in developing low-cost, portable sensing platforms for practical food safety monitoring.
Section
Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 18
·13143-13155
·
IF 2.993
Li Jie,Chen Chao,Qin Furong,Jiang Yongjia,An Hao,Fang Jing,Zhang Kai,Lai Yanqing
Cobalt–nitrogen-doped mesoporous carbon (Co–N–C) is synthesized as a host for lithium–sulfur batteries. With the Co–N–C composite as a sulfur host, the initial capacity of lithium–sulfur batteries is as high as 1290.8 mA h g −1 at 0.2 C, and Li–S batteries still exhibit good cycling stability and high capacity with a retained capacity of 795.7 mA h g −1 and a nearly 100% coulombic efficiency after 300 cycles. The good performance of Li–S batteries can be attributed to a higher specific surface area and pore volume of the carbon matrix and good chemical affinity of Co and N elements toward polysulfides. It is found that Co–N–C composite can effectively adsorb lithium polysulfide by physical, chemical adsorption and well inhibit the shuttle effect. In addition, Co–N–C composite which act as a catalyst can also significantly promote the conversion of polysulfide, accelerate the kinetics, thereby improving the performance of Li–S batteries.
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CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Na Huo,Hong Ma,Xinhong Wang,Tianlong Wang,Gang Wang,Ting Wang,Leilei Hou,Jin Gao,Jie Xu
ABSTRACT From both fundamental and practical perspectives, the production of chemicals from biomass resources using high-efficiency non-precious metal catalysts is important. However, many processes require addition of stoichiometric or excess quantities of base, which leads to high energy consumption, leaching problems, and side reactions. In this study, we investigated the high-efficiency oxidative esterification of furfural to methylfuroate by molecular oxygen with a Co-N-C/MgO catalyst. The catalyst was prepared by direct pyrolysis of a cobalt(II) phenanthroline complex on MgO at 800 °C under N 2 atmosphere. From furfural, 93.0% conversion and 98.5% selectivity toward methylfuroate were achieved under 0.5 MPa O 2 with reaction at 100 °C for 12 h without a basic additive. The conversion and selectivity were much higher than those obtained with cobalt catalysts produced by pyrolysis of a cobalt(II) phenanthroline complex on activated carbon or typical basic supports, including NaX, NaY, and CaO. X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and experimental results revealed that the high efficiency of Co-N-C/MgO for production of methylfuroate was closely related to the cobalt-nitrogen-doped carbon species and its catalytic ability in hydrogen abstraction. In contrast, Co-N-C(HCl) that synthesized by removing MgO with HCl from Co-N-C/MgO, as the catalyst produced mainly an acetal as a condensation product, and chloride ions had a negative effect on the oxidative esterification. Although the catalytic performance of the cobalt-nitrogen-doped carbon species was greatly affected by HCl treatment, it could be recovered to a great extent by addition of MgO. Moreover, changes in the oxygen pressure hardly affected the oxidative esterification of furfural with Co-N-C/MgO. This study not only provides an effective approach to prepare methylfuroate, but also for designing high-performance non-precious metal catalysts for the oxidative esterification of biomass-derived compounds.
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FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Hao-Yue Ma,Jun-Fei Gu,Xing-Chuan Li,Zhan Chen,Qi-Yu Fu,Francis Verpoort,Wen-Jie Mo,Zheng Liu,Cheng Chen,Soon Hyeok Hong,Zongkui Kou
The transition from petroleum-derived chemicals to sustainable alternatives has intensified interest in 2,5-furandicarboxylic acid (FDCA), a biomass-derived monomer for green polyester production. However, many non-noble metal catalysts for converting 5-hydroxymethylfurfural (HMF) to FDCA still require multistep syntheses and/or harsh oxidation conditions. Here, we report a straightforward molten-salt strategy to prepare nitrogen-doped porous carbon–supported cobalt catalysts (Co@N-C-x). Under ambient air at 90 °C in water, the optimized [email protected] catalyst affords complete HMF conversion and > 99 % FDCA yield, with a productivity of ~1.17 mol FDCA mol Co −1 h −1 , and retains 96.5 % yield in an initial 400-fold scale-up test. Mechanistic and kinetic analyses support a sequential pathway of HMF → HMFCA → FFCA → FDCA, with the FFCA-to-FDCA step being kinetically most demanding under the present conditions. Structure–activity analysis, together with atmosphere-dependent experiments, indicates that Co–Nₓ sites serve as the primary catalytic centers, while adjacent defect-rich surface sites (denoted as O₂-activation sites) promote dioxygen activation and facilitate stepwise oxidation. Density functional theory calculations further show that FDCA binds more strongly to the catalyst surface than the intermediates, which can hinder product desorption and contribute to the observed loss of activity upon recycling.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Hu Qing,Wu Haiyi,Shi Ling,Yao Zhenhua,Jin Fang,Hu Maocong
This study investigates the synergistic effects of pyrolysis temperature and sulfur doping on the structure and oxygen reduction reaction (ORR) performance of cobalt-based catalysts derived from metal–organic frameworks. Using thiourea as the sulfur source, a series of Co-NSC catalysts were synthesized at different temperatures (750–1050 °C). The results demonstrate that sulfur doping effectively inhibits metal agglomeration by forming Co–S coordination bonds, while an optimal pyrolysis temperature (850 °C) balances defect density, pore structure, and active-site distribution. Among all samples, Co-NSC-850 exhibits favorable ORR activity in alkaline medium, with a half-wave potential of 0.852 V, an electron transfer number close to 4, and H 2 O 2 selectivity below 5%. When applied in zinc-air batteries, Co-NSC-850 delivers a power density of 254.22 mW cm −2 , a small charge–discharge gap (1.02 V), a specific capacity of 809.18 mAh g −1 , and a cycle life of 220 h, comparable to or better than commercial Pt/C. This work provides valuable insights for designing high-performance non-noble metal ORR catalysts through cooperative regulation of temperature and heteroatom doping. Graphical abstract
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shuai Wang,Yuqi Chen,Shuyan Zheng,Yanan Yuan,Kexin Du,Min Cui,Yue Wu,Ping Li,Wei Hu,Jingui Wang,Yingshu Guo,Zexing Wu,Yanli Zhao
The incorporation of sp-hybridized nitrogen arisen from graphdiyne (GDY) into the catalyst structure significantly improves the electrocatalytic efficiency of zinc–air batteries by modulating the electronic properties of the active sites, thereby accelerating reaction kinetics and enhancing conductivity. This work highlights the efficacy of the Co–N-GDY catalyst, where sp-N moieties in GDY serving as anchoring centers for cobalt species, which demonstrates exceptional performance in the oxygen reduction reaction, achieving a half-wave potential of 0.85 V, along with high oxygen evolution reaction performance that surpasses that of commercial Pt/C + IrO2-based batteries. The Co–N-GDY catalyst also exhibits commendable cycling stability with minimal fluctuation in voltage difference, indicating its suitability for practical applications in advanced energy storage systems. These findings underscore the importance of developing cost-effective and durable M–N–C catalysts to enhance the commercial viability and sustainability of zinc–air battery technology.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Wang,Hongcen Yang,Niandi Lu,Shulai Lei,Dali Jia,Zhixia Wang,Zhenhua Liu,Xiaogang Wu,Hanzhen Zheng,Salamat Ali,Fei Ma,Shanglong Peng
Developing highly active and robust non-noble metal bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of dominant significance for global applications in rechargeable Metal-air Batteries. Fine-tuning the exposed active sites is a competent way to improve their performance. Herein, the NaCl template-assisted strategy for rationally designing a three-dimensional cellular structured nitrogen-doped carbon matrix integrated with nano-scaled Co species has been developed. The resulting electrocatalyst (3D Co/N-C) exhibits a positive half-wave potential of 0.84 V (vs RHE) in ORR, and a low potential of 1.56 V (vs RHE) at 10 mA cm −2 during OER process. Moreover, 3D Co/N-C based Zn-air Batteries (ZABs) exhibit excellent battery performance, especially remarkable power density. The poisoning experiments and DFT calculations identify active sites as pyridinic N and Co during ORR and OER processes, respectively. This work provides a general and easy-to-perform tactic to design bifunctional catalysts, thus helps precisely modulate effective components for ZABs.
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 10
·105601
·
IF 3.874
Li Lin,Xing Du,Junjie Wang,Hui Chen,Xuan He,Wei Fang,Yang Li,Zhen Chen,Lei Zhao
Two-dimensional (2D) cobalt zeolitic imidazolate frameworks (ZIF-67) have attracted significant research interests to synthesize cobalt and nitrogen co-doped carbon-based (Co–N–C) catalyst for oxygen reduction reaction (ORR). However, most of the current synthetic approaches of 2D ZIF-67 are energy-intensive, environmentally hazardous and low-yield. Herein, a feasible and efficient 'morphology-retaining method via a high-pressure vapor-solid reaction' are reported to synthesize 2D ZIF-67 nanosheets by using 2D cobalt carbonate hydroxide template. In the strategy, the high-pressure vapor caused by sublimation of 2-Melm and the pores formed from effusion of CO2 during transformation ensure the complete transformation from 2D template to 2D ZIF-67. The corresponding 2D Co–N–C catalyst exhibits comparable ORR electrocatalytic activity and better stability than Pt/C in alkaline media. The present method is expected to offer a feasible and universal way to efficiently synthesize 2D M–N–C catalysts.
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ACS Catalysis
·
2021
·
IF 13.084
Lipeng Wu,Bin Li,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Qing Xia,Wenchao Peng
Herein, a series of Co@N–C materials are synthesized using nitrates (LiNO3, NaNO3, and KNO3) as templates to control the preferential growth of the cobalt (200) facet. Co@N–C–X (X = LiNO3, NaNO3, and KNO3) exhibit excellent activities and long-term stabilities for Fenton-like degradation of bisphenol A (BPA) with peroxymonosulfate (PMS) as an oxidant. The texture coefficient (TC) is used to investigate the relationship between the Co facets and their catalytic activities, and a linear relation is built between the TC of Co(200) and the reaction rate constant (k). Co(200) is therefore the most active facet for PMS activation, while nitrates can promote the preferential growth of the Co(200) facet. Moreover, the Co(200) facet is more stable against leaching and can achieve more quick transformation between Co2+/Co3+. Quenching tests, electron paramagnetic resonance spectra, and electrochemical tests show that singlet oxygen (1O2) plays the dominant role for BPA degradation. Density functional theory verifies that Co nanoparticles coated with a graphitic nitrogen-doped carbon layer have the best activity for PMS activation. This work first proposes the strategy of using nitrates to control the preferential growth of Co facets and reveals the relationship between the TC value and k, thus attracting great interest in the environmental field.
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Frontiers in Chemistry
·
2026
·
IF 5.3
Zhaoyu Meng
The conversion of CO 2 to CO using electrochemistry requires the use of earth abundant catalysts with high selectivity, rapid reaction rate, and durability. In this work, hierarchically porous Co–N–C catalysts were synthesized via co-pyrolysis of a bimetallic zeolitic imidazolate framework (Zn/Co) and the dicyandiamide (DCD) followed by acid etching. By systematically adjusting the pyrolysis temperature (800 °C–1,000 °C) and the Co feed ratio (5–20 mol%), volcano-type activity relationships are found, which are controlled by the interplay of the three factors graphitization, nitrogen retention, and the density of Co–N x sites. The optimized catalyst CoNC-900 achieves a Faradaic efficiency of CO of 94.9% ± 1.0% at −0.75 V vs. RHE in CO 2 -saturated 0.5 M KHCO 3 with a CO partial current density of 16.0 mA cm −2 , a lower bound turnover frequency of ≥0.33 s −1 and ≈11% current decay FE_CO retained above 92% over 24 h. The observed selectivity can be rationalized, as the density functional theory calculations indicate that the barrier of the rate-determining step, namely the formation of COOH is lowered on the Co–N 4 moiety (0.42 eV, whereas ≥1.79 eV on the metal-free nitrogen sites). A transferable design rule is developed for CO 2 electrolysis that relates bimetallic MOF precursor chemistry, hierarchical porosity, and M–N x site engineering.
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