JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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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
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电化学
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能源化学
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纳米材料
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催化化学
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Foods
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2026
·Vol. 15
·期 17
·3002
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IF 6
Min Li,Yulin Wang,Huajuan Yin,Xu Jing,Yunlong Li
Triazole fungicides (TFs) are widely used in cereal production due to their potent fungicidal activity and broad-spectrum efficacy. Nonetheless, residues of TFs in food products may pose risks to food safety and human health. Therefore, the development of efficient and environmentally friendly sample preparation methods is paramount for the reliable determination of TFs. Herein, a novel green solvent-based dispersive liquid–liquid microextraction method coupled with high-performance liquid chromatography (DLLME-HPLC) was developed for the determination of TFs in cereal samples. The prepared magnetic deep eutectic solvents (MDESs), composed of nonanoic acid and ferric hydroxide, served as green, magnetically responsive extraction solvents, enabling rapid magnetic separation without centrifugation. Four bio-based solvents (BBSs) were investigated as green dispersive solvents to facilitate the dispersion of MDESs and replace conventional toxic organic dispersants, thereby further enhancing the environmental sustainability of the extraction procedure. Owing to the combined effects of hydrophobic interactions, hydrogen-bonding networks, and magnetic responsiveness, the proposed method achieved efficient extraction and rapid phase separation while minimizing solvent consumption and operational complexity. The greenness of the method was evaluated using multiple green analytical chemistry metrics, confirming its low environmental impact, reduced waste generation, and improved operational safety compared with conventional DLLME procedures. Under optimized conditions, the method was successfully applied to determine TFs in rice, wheat, corn, buckwheat, and oat samples, achieving recoveries ranging from 75.0% to 101.9% and relative standard deviations of 1.6–4.8%. The developed DLLME method provides a rapid, sensitive, and environmentally friendly strategy for cereal pesticide residue analysis and expands the application of MDESs and BBSs in green sample preparation.
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CHINESE JOURNAL OF CATALYSIS
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2026
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IF 17.2
Yue Zeng,Hongsheng Wang,Jing Xuan,Ping Xiao,Yaoyao Feng,Shuai Lyu,Junjiang Zhu
Although CeO 2 /Co 3 O 4 composites exhibit excellent catalytic performance in oxidation reactions, the atomic-scale origin of their interfacial interactions remains unclear. In this work, we compare two contrasting catalysts: Co 3 O 4 -supported Ce single atoms and Co 3 O 4 -supported CeO 2 nanoparticles. We reveal that these two forms of Ce promote catalytic performance through different mechanisms. Ce single atoms occupy the octahedral Co 3+ sites within the Co 3 O 4 structure, forming Ce 3+ -Vo-Co active sites and thereby induce local compressive strain and facilitate the formation of point-defective oxygen vacancies. More importantly, Ce 3+ acts as an electron donor, elevating the d -band center of Co and facilitating O 2 activation via enhanced electron transfer to O 2 antibonding orbitals. In contrast, the extensive interfacial contact between CeO 2 nanoparticles and Co 3 O 4 triggers ion migration, which subsequently generates defects or amorphous interfacial domains with high oxygen mobility. The configuration of interfacial defects is highly dependent on the size of CeO 2 nanoparticles. Catalytic tests for the liquid-phase aerobic oxidation of benzyl alcohol confirm the superior performance of the single-atom catalyst, which exhibits 1.5 times higher activity and a 27.7 kJ/mol lower activation energy than its CeO 2 nanoparticle counterpart. Our findings demonstrate that the interaction between Ce species and Co 3 O 4 is dominated by electronic effects when Ce is atomically dispersed, whereas interfacial reconstruction becomes predominant with increasing CeO 2 nanoparticles size.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Long Yang,Wenbo Hu,Ruida Cao,Qingqing Zhou,Chencheng Hu,Biao Dong,Hongwei Song,Lin Xu
All-nanofiber triboelectric nanogenerators (TENGs) have emerged as promising candidates for wearable electronics and IoT systems due to their intrinsic flexibility, breathability, and skin-conformable designs. Yet, the trade-off between dielectric enhancement and mechanical reliability persists in current commonly-used composite strategies. In this study, we present a novel liquid metal (LM) inner-encapsulated all-nanofiber TENG (TM-TENG) to improve both mechanical energy harvesting and self-powered sensing capabilities. By embedding LM nanoparticles into a hierarchically structured nanofiber network, a dual optimization of interfacial polarization and charge trapping capabilities is achieved. The resulting LM-TENG demonstrates excellent electrical outputs, with open-circuit voltage of 162 V , short-circuit current of 3.3 μA, and power density of 176 mW∙m −2 as well as ultralong-term stability (>10,000 cycles). Its pressure-sensitive triboelectric response (6.11 V ∙kPa −1 ) enables multimodal sensing, including real-time physiological signal monitoring, gait analysis, information transmission, and encrypted human-machine communication. Remarkably, the LM-TENG device can also serve as an impedance-matched and sustainable power source for wireless humidity sensors. When integrated with a convolutional neural network, the integrated system achieves 96.97 % accuracy in sleep apnea severity classification. This work establishes a universal strategy for designing high-performance, fully fiber-based TENGs, which is promising for next-generation smart healthcare systems and human-machine interfaces.
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JOURNAL OF RARE EARTHS
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2026
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IF 9.6
Jing Xuan,Olga Kelebogile Mmelesi,Yali Yao,Zhen Wang,Shuai Lyu,Xiao Xu,Zhiyan He,Jie Yang,Ping Xiao,Junjiang Zhu
Atomic-level engineering of the surface and electronic structure of Co 3 O 4 catalysts holds significant importance for both fundamental catalytic mechanisms and practical applications. In this study, well-defined La single atom-doped Co 3 O 4 catalysts were designed via an ion exchange process. Theoretical and experimental analyses demonstrate that single La atoms selectively substitute Co 3+ ions at octahedral sites in Co 3 O 4 . The larger ionic radius of La induces compressive strain on adjacent atoms, resulting in localized lattice distortion. To release the local tension, an asymmetric La–V o –Co site spontaneously forms. The coordination number of La decreases from 6 to 4.7 due to vacancy formation, leading to a reduced valence state and enhanced electron-donating propensity. Theoretical calculations reveal that single-atom La doping leads to an upshift of the Co 3 O 4 d-band center, thereby enhancing its interaction with oxygen. Besides, electrons from the 5d orbitals of La transfer to the π * antibonding orbitals of molecular oxygen during catalytic oxidation, thereby weakening the O–O bond strength and promoting oxygen dissociation. The single-atom La modified Co 3 O 4 catalyst exhibits remarkable catalytic activity in the oxidation of benzyl alcohol (BzOH), resulting in a 4.5-fold increase in conversion rate compared to unmodified Co 3 O 4 . The findings of our research provide a robust foundation for the characterization and comprehension of single-atom rare earth catalysts in heterogeneous oxidation reaction.
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Nanomaterials
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2022
·Vol. 12
·期 6
·1015
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IF 5.719
Meng Li,Yujie Huang,Jiaqi Lin,Meize Li,Mengqi Jiang,Linfei Ding,Dongmei Sun,Kai Huang,Yawen Tang
Proper control of a 3dtransition metal-based catalyst with advanced structures toward oxygen evolution reaction (OER) with a more feasible synthesis strategy is of great significance for sustainable energy-related devices. Herein, carbon nanotube interconnected NiCo layered double hydroxide rhombic dodecahedral nanocages (NiCo-LDH[email protected]) were developed here with the assistance of a feasible zeolitic imidazolate framework (ZIF) self-sacrificing template strategy as a highly efficient OER electrocatalyst. Profited by the well-fined rhombic dodecahedral nanocage architecture, CNTs’ interconnected characteristic and structural feature of the vertically aligned nanosheets, the as-synthesized NiCo-LDH[email protected]integrated large exposed active surface areas, enhanced electron transfer capacity and multidimensional mass diffusion channels, and thereby collaboratively afforded the remarkable electrocatalytic performance of the OER. Specifically, the designed NiCo-LDH[email protected]exhibited a distinguished OER activity, which only required a low overpotential of 255 mV to reach a current density of 10 mA cm−2for the OER. For the stability, no obvious current attenuation was detected, even after continuous operation for more than 27 h. We certainly believe that the current extraordinary OER activity combined with the robust stability of NiCo-LDH[email protected]enables it to be a great candidate electrocatalyst for economical and sustainable energy-related devices.Keywords:NiCo layered double hydroxides;carbon nanotubes;self-sacrificing template;hollow structure;oxygen evolution reaction
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Genghuang Wu,Linmin Zhao,Mingsheng Zong,Peng Yu,Jingxin Xie,Zhijian Da,Hongyang Liu,Junfeng Rong
Graphene encapsulating 3d transition metal nanoparticles (Ni, Co, Fe@G) are successfully fabricated through pyrolysis of complexes which are simply prepared via “acid-base reactions” between metal hydroxides and carboxylic acid such as citric acid . In particular, the Ni@G catalyst exhibits outstanding catalytic activity and selectivity (>99%) toward the reduction of various nitroaromatics under mild conditions (1 MPa H 2 , 60 °C), even in the presence of poisons (CO and thiophene etc.). This “acid-base reactions” based method provides a facile and scalable approach to prepare graphene encapsulating 3d transition metals with wide ranges of applications.
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Frontiers in Chemistry
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2021
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IF 5.221
Yan Yubing
Developing efficient and low-cost replacements for noble metals as electrocatalysts for the oxygen evolution reaction (OER) remain a great challenge. Herein, we report a needle-like cobalt carbonate hydroxide hydrate (Co(CO3)0.5OH·0.11H2O) nanoarrays, which in situ grown on the surface of carbon cloth through a facile one-step hydrothermal method. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations demonstrate that the Co(CO3)0.5OH nanoarrays with high porosity is composed of numerous one-dimensional (1D) nanoneedles. Owing to unique needle-like array structure and abundant exposed active sites, the Co(CO3)0.5OH@CC only requires 317 mV of overpotential to reach a current density of 10 mA cm−2, which is much lower than those of Co(OH)2@CC (378 mV), CoCO3@CC (465 mV) and RuO2@CC (380 mV). For the stability, there is no significant attenuation of current density after continuous operation 27 h. This work paves a facile way to the design and construction of electrocatalysts for the OER.
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Molecular Catalysis
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2021
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IF 5.062
Huimin Niu,Zhiruo Wu,Zhong-ting Hu,Jinghuan Chen
Cobalt oxide (Co 3 O 4 ) materials with specific structure have shown great potential as highly efficient catalysts in the oxidation reactions. In this work, a novel hierarchical flower-like Co 3 O 4 was synthesized by the imidazolate-induced hydrothermal and subsequent thermolysis method. The effect of reaction parameters as well as the phase evolution of the flower-like structure was investigated in detail. For comparison, a rod-like Co 3 O 4 was also prepared with urea under similar conditions. The morphology-dependent effect of Co 3 O 4 towards toluene oxidation was studied. Moreover, the physicochemical properties of Co 3 O 4 were analyzed by various characterization techniques. The flower-like Co 3 O 4 catalyst presented a higher catalytic activity for toluene oxidation than the rod-like Co 3 O 4 , which was associated with hierarchical flower-like morphology, reactive exposed planes, abundant adsorbed oxygen species at surface and better low-temperature reducibility.
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JOURNAL OF CATALYSIS
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2020
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IF 7.888
Xuerong Zhou,Xiang Li,Roel Prins,Jinyin Lv,Anjie Wang,Qiang Sheng
CoP and Co 2 P were prepared by temperature-programmed reduction of the mixtures of Co(OH) 2 and H 3 PO 3 with stoichiometric P/Co ratios, but their surfaces were still enriched in phosphorus. Based on the product distributions of the hydrodesulfurization (HDS) of dibenzothiophene (DBT), 1,2,3,4-tetrahydro-dibenzothiophene (TH-DBT), and 1,2,3,4,4a,9b-hexahydro-dibenzothiophene (HH-DBT), a reaction network of DBT HDS was proposed and the mechanisms of the cleavage of different C S bonds in DBT and its hydrogenated intermediates were discussed. CoP was much more active and more nitrogen-tolerant than Co 2 P, which make it a promising HDS catalyst. The HDS reactions over CoP and Co 2 P followed a pseudo-first-order kinetics and a pseudo-zero-order kinetics, respectively. Piperidine strongly inhibited the hydrogenation/dehydrogenation reactions and the direct desulfurization of DBT, but its inhibition on the desulfurization of TH-DBT and HH-DBT were less pronounced. The active surfaces of CoP and Co 2 P in HDS reactions can be cobalt phosphosulfide phases.
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ACS Catalysis
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2020
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IF 12.35
Shangbo Ning,Hua Xu,Yuhang Qi,Lizhu Song,Qiqi Zhang,Shuxin Ouyang,Jinhua Ye
The transformation of CO2 into a single product is a critical scientific challenge because of the difficulty associated with targeted activation and conversion of CO2 by heterogeneous catalysts. Herein, we present an atomic-scale dispersed Co–N species anchored Co@C hybrid structure (entitled as Co@CoN&C) that regulates catalytic properties in thermodynamic and kinetic processes to achieve active and highly selective CO yield in the photothermal CO2 reduction. An optimal sample delivers the maximum yield rate of 132 mmol gcat.–1 h–1 and remarkable CO selectivity (91.1%), while the undesirable methanation activity, compared with typical Co nanoparticles (NPs), was suppressed. The mechanism study suggests that the strong photon–matter interaction over graphitic-carbon and Co NPs can enhance the light-to-heat conversion efficiency and thus induce the high work temperature, which is thermodynamically beneficial for CO2 activation and subsequently promoted the catalytic activity. Furthermore, the carbon layers improve the adsorption of CO2, and the surface atomically dispersed Co–N species weakens hydrogenation capability, which kinetically controls the reaction pathway and therefore attains the high selectivity for CO production. This study exemplifies that the microstructure design can modulate the thermodynamic and kinetic factors of photochemical reaction and thereby achieve potential solar-to-chemical energy conversion.
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Nanomaterials
·
2023
·Vol. 13
·期 24
·3153
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IF 5.3
Zhenteng Sheng,Hui Zhou,Yuhua Zhang,Jinlin Li,Li Wang
The selective hydrogenation of CO2into high-value chemicals is an effective approach to address environmental issues. Cobalt-based catalysts have significant potential in CO2hydrogenation reaction systems; however, there is a need to control their selectivity better. In this study, copper is introduced onto Co3O4nanosheets using the ion exchange reverse loading method. The unique interaction of these materials significantly alters the selectivity of the cobalt-based catalyst. Results from scanning transmission electron microscopy and scanning electron microscopy indicate that this catalyst enables a more even dispersion of copper species in the Co3O4nanosheets. Temperature-programmed reduction and X-ray photoelectron spectroscopy reveal that the catalyst facilitates the metal–metal interaction between Co and Cu. Temperature-programmed desorption experiments for CO2and H2demonstrate that the close interaction between Co and Cu modifies CO2adsorption, leading to differences in catalytic activity. Moreover, the catalyst effectively suppresses CO2methanation and promotes methanol formation by altering the alkalinity of the catalyst surface and weakening the hydrogen dissociation ability.Keywords:CO2hydrogenation;methanol;cobalt;copper
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