DIAMOND AND RELATED MATERIALS
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2024
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IF 4.3
Yu Wang,Yanling Wang,Yunmei Du,Yanru Liu,Volodymyr Turkevych,Lei Wang
Transition metal nitrides (TMNs) have attracted great attention as ideal active materials in the field of electrocatalysts in recent years due to their excellent electrical conductivity, wide band gap and adjustable morphology. Pure phase Co 4 N nanoparticles encapsulated nitrogen-doped carbon (NC) nanotubes (Co 4 N@NC) were in-situ synthesized by one-pot method. In this paper, the morphology of carbon nanotubes is controlled by adjusting the pyrolysis time, so that more active sites are exposed on carbon nanotubes. Thus, the cobalt nitride catalyst with excellent catalytic performance for hydrogen evolution reaction (HER) in acidic electrolyte was obtained. In summary, due to the protection of mesoporous nitrogen-doped carbon to Co 4 N nanoparticles, large electrochemically active surface area, good conductivity and more exposed active sites, Co 4 N@NC possesses excellent HER performance in acidic electrolytes. The overpotential of Co 4 N@NC at the current density of 10 mA cm −2 is 117 mV (η 10 ), and it shows long-term stability in 0.5 M H 2 SO 4 solution for 50 h. This study provides a strategy for the development of catalysts for the controllable synthesis of high-performance transition metal nitrides.
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Materials Today Chemistry
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2024
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IF 6.7
Yiting Jiang,Zhejie Chen,Yating Yuan,Linxin Tian,Chuhuang Dong,Wencheng Shen,Jinchao Wei,Shengpeng Wang,Yu Yang,Jia Ge
Alpha-glucosidase (α-Glu) is a hydrolase that promotes the rise of glucose in the blood during the digestion process, and it plays a crucial role in regulating glucose levels within a normal range. Herein, we developed an ultrasensitive colorimetric platform by preparing a Cu–N–C single-atom nanozyme (Cu–N–C SAzyme) with a potent oxidase-like effect on accurately detection of α-Glu and efficient screening of its potential inhibitors. This artificial nanoenzyme was able to catalyze the oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxide (oxTMB) without the assistance of H 2 O 2 . In addition, with the participation of α-Glu, l -ascorbic acid-2- O -α- d -glucopyranose (AAG) can be catalyzed to produce ascorbic acid (AA), which significantly reduces the oxidation, resulting in a noticeable fading of the blue color. Therefore, we designed a straightforward colorimetric test for α-Glu activity, achieving detection limits as low as 0.09 U/L and a linear response from 0.25 to 8 U/L. Most importantly, this platform has been effectively applied to measure α-Glu in real samples.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Ying Han,Xiaoping Zheng,Beibei Jiang,Yuling Tang,Hongyuan Liu,Kemin Zhang,Yaping Guo,Jun Li
The influencing factors, products and mechanism of N -nitrosodimethylamine (NDMA) reduction by zinc (Zn) in the presence of transition-metal ions (Mn 2+ , Co 2+ and Ni 2+ ), were investigated. The NDMA removal by Zn was significantly improved by them, and the promoting effect of Co 2+ and Ni 2+ were better than Mn 2+ . With the decrease of pH values and dissolved oxygen concentrations, the removals of NDMA were enhanced in all reaction systems. NDMA was mainly reduced to unsymmetrical dimethylhydrazine (UDMH) in Zn and Zn/Mn 2+ systems. It was mainly reduced to dimethylamine (DMA) and ammonium (NH 4 + ) in Zn/Co 2+ and Zn/Ni 2+ systems. There were undetected products in all reaction systems. Catalytic hydrogenation was the main mechanism, and active hydrogen atom was the main active species. The presence of Mn 2+ , Co 2+ and Ni 2+ promoted the corrosion of Zn and changed the surface morphology of Zn. The formation of type I film on Zn surface was promoted in the presence of Co 2+ and Ni 2+ , which was conducive to the continuous corrosion of Zn and hydrogen generation. While type II film which would inhibit the corrosion of Zn formed on Zn surface in the presence of Mn 2+ . MnO 2 , Co 3 O 4 and Ni(OH) 2 were formed in Zn/Mn 2+ , Zn/Co 2+ and Zn/Ni 2+ systems, respectively. They would facilitate more generation of active hydrogen atoms.
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ChemSusChem
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2024
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IF 7.5
Yanxiang He,Meilian Tu,Weijiang Gan,Zhixiao Zhu,Muhammad Mushtaq,Mohammad Al-Mamun,Jianqiu Deng,Hao Yang,Zhongmin Wang,M.-Sadeeq Balogun
Graphical A high-performance heterogeneous N-doped FeMoO 4 -Mo 2 N electrocatalyst was synthesized and applied as HER electrocatalyst in alkaline freshwater and alkaline seawater. Benefiting from the individual properties of both N-doped FeMoO 4 and Mo 2 N, the optimized FeMoO 4 -Mo 2 N electrocatalyst requires low overpotentials of 23 and 29 mV to afford 10 mA cm −2 in 1 M KOH freshwater and seawater electrolytes, respectively. Durable and efficient Fe-based electrocatalysts in alkaline freshwater/seawater electrolysis is highly desirable but persists a significant challenge. Herein, we report a durable and robust heterogenous nitrogen-doped FeMoO 4 /Mo 2 N rod-shaped catalyst on nickel foam (denoted NF@FMO/MN) affording hydrogen evolution reaction (HER) low overpotentials of 23/29 mV@10 mA cm −2 and 112/159 mV@100 mA cm −2 in both alkaline freshwater/seawater electrolytes, respectively. These results are significantly superior to the pristine FeMoO 4 catalyst. Theoretical calculations consistently reveals that the combination of N-FeMoO 4 and Mo 2 N effectively reduces water activation energy barrier, modulates the sluggish water-dissociation kinetics and accelerates the hydrogen adsorption process for efficient HER. The enhanced HER performance of the as-designed NF@FMO/MN catalyst is attributed to the in situ hetero-interfacial engineering between N-doped FeMoO 4 and Mo 2 N. This present work nurtures the progress of FeMo-based electrocatalysts in alkaline freshwater/seawater electrolysis.
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PubMed
高影响因子
Nano Today
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2024
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IF 13.2
Ke Zhu,Wenlei Qin,Yuwen Chen,Xiaoyin Liang,Haoran Xin,Zhihan Huang,Hector F. Garces,Yaping Gan,Mika Sillanpää,Rongliang Qiu,Guoqing Guan,Kai Yan
Constructing the coordination environment of single-atom catalysts (SACs) can be an attractive technical strategy to regulate the generation of reactive oxygen species for Fenton-like reactions. Herein, we have constructed an asymmetric coordination of Fe single-atom catalyst (Fe SA -NS-PCNS) with abundant N-Fe-S bridge (Fe SA -N 3 S 1 ) for robust Fenton-like reactions. 82.5 % of singlet oxygen ( 1 O 2 ) selectivity and high turnover frequency of bisphenol A degradation (0.568 min −1 ) were achieved at mild conditions. Experimental works and theoretical analyses illustrated that S doping breaks the inert environment of the original N-Fe-N symmetric coordination equilibrium and modulates the electron density of the atomic Fe center, which is beneficial for boosting PMS adsorption and reducing the energy barriers of vital *OH and *O intermediates. The coupling between the Fe SA -N 3 S 1 interface and peroxymonosulfate molecule boosts in-situ electron transfer through the N-Fe-S bridge, which induces more electron flow from the low valence Fe to OH* on the surface of Fe-*O-H, forming a high yield of 1 O 2 . Moreover, we designed the Fenton-like reactions by Fe SA -NS-PCNS membrane reactor for an efficient contaminant removal rate of over 90 % even after 11 cycles. This work provides a novel perspective on developing SACs with asymmetric coordination to regulate reactive oxygen species for the treatment of organic contaminants in water bodies.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Haiqian Zhao,Jiuyang Jia,Jiaxin Ying,Mingqi He,Zekun Sun,Xing Zhang,Zhonghua Wang,Wei Zhou
Utilizing flue gas as feedstock for CO 2 electro−reduction systems is a promising technology to address problems caused by excessive CO 2 emissions. However, the O 2 contained in the flue gas has a significant adverse effect on the CO 2 reduction. Herein, a facile strategy was proposed to suppress the influence of O 2 by constructing a CO 2 −enriched region. N−doping was demonstrated to be an efficient way to enhance CO 2 adsorption selectivity over O 2 on activated carbon. The N−doped activated carbon achieved 3.7 times increase in CO 2 adsorption selectivity over O 2 than that before modification under simulated flue gas atmosphere (75 %N 2 + 15 %CO 2 + 10 %O 2 ). The distinction in adsorption mechanism between CO 2 and O 2 was revealed by quantum chemistry study. The increased polarity of the carbon materials favored CO 2 adsorption and had less impact on O 2 adsorption. The electrostatic interaction between CO 2 and carbon material was demonstrated to be enhanced after the introduction of pyridinic N and pyrrolic N, which led to an improvement in the CO 2 adsorption capacity. The dispersion interaction, which fully regulated O 2 adsorption, was weakened due to the deviation of the O 2 adsorption position. This study provided a reference for the subsequent development of CO 2 selective adsorption materials.
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ADVANCED MATERIALS
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2025
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IF 26.8
Cong Liu,Chen Zuo,Qifan Xue,Dongxu Lin,Tao Liu,Jun Luo,Hao Huang,Kai Chen,Yanyan Gao,Jie Zeng,Yong Zhang,Baomin Xu,Tao Yang,Yaohua Mai,Bingsuo Zou,Christoph J. Brabec,Xiaotian Hu
A strong n-type perovskite layer is crucial in achieving high open-circuit voltage ( V OC ) and power conversion efficiency (PCE) in the p-i-n solar cells, as the weak n-type perovskites result in a loss of V OC , and the p-type perovskites contain numerous electron traps that cause the severe carrier recombination. Here, three types of perylene diimide (PDI) based small molecule dopants with different dimensions, including 1D-PDI, 2D-PDI, and 3D-PDI are designed, to produce heavier n-type perovskites. The PDI-based molecules with Selenium atoms have a strong electron-donating ability, effectively enlarging the quasi-Fermi level splitting within the perovskites. Besides, the PDI molecules can coat the surface of the perovskite crystal to form the lattice cage through their conjugate skeletons, which passivates the trap states and improves the n-doping efficiency, as well as the stabilities of perovskites and related devices. With the addition of the 2D-PDI, the small-area solar cells achieved a PCE of 26.06% (25.44% certified) with a high V OC of 1.18 V and a remarkable fill factor of 87.23%. Furthermore, the rigid and flexible perovskite solar modules yielded high PCEs of 21.48% and 20.71%, respectively. This dimensional regulation strategy provides useful guidance for effective n-type doping and high-performance p-i-n solar cells.
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FOOD CHEMISTRY
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2025
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IF 9.8
Yujia Song,Li Tian,Ruidan Li,Yanjia Guo,Pengfei Han,Guangping Ma,Hanyue Jiang,Wenzhuo Wang,Juan Lu
In this work, g-C 3 N 4 of N-rich vacancy (CNNV) and mesoporous SiO 2 were synthesized. A novel electrochemiluminescence (ECL) sensor for curcumin (Cur) based on CNNV@SiO 2 and Ti 2 AlC was constructed. An initial ECL signal was generated from the CNNV-S 2 O 8 2 − system. SiO 2 significantly adsorbed more S 2 O 8 2 − , thereby enhancing the ECL signal. Ti 2 AlC served as an effective co-reaction promoter, further amplifying the ECL signal of CNNV@SiO 2 -S 2 O 8 2 − system. With the addition of Cur, the ECL signal also decreased, which can be attributed to the resonance energy transfer (RET) mechanism between CNNV (donor) and Cur (acceptor). Under optimal conditions, a strong linear relationship was observed between the change in ECL signal (ΔI) and the logarithm of Cur concentration (lgC Cur ), spanning from 5 × 10 −15 to 5 × 10 −9 mol L −1 with a detection limit of 1.7 × 10 −15 mol L −1 . The constructed ECL sensor was successfully applied to detect Cur in real samples.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Lu Hao,Ji Li,Xinxing Wang,Bin Yue,Hong Shao,Feng Li,Tianqi Wang,Xiangting Dong
N-butanol, due to its poisonous and flammable nature, poses a significant danger to human health, making it crucial to monitor its presence in the environment. In this work, FeVO 4 nanofibers (550) with a one-dimensional (1D) structure have been successfully fabricated through a simple electrospinning combined with calcination at 550 °C. FeVO 4 nanofibers (550) exhibit a triclinic crystal structure and possess a 1D fiber morphology. Electrospun FeVO 4 nanofibers (550) are firstly used in gas sensing and have superior performance as n-butanol gas sensors. At an optimized working temperature of 300 °C, FeVO 4 nanofibers (550) achieve a peak response of 4.05 to 100 ppm n-butanol, short response/recovery time (3 and 14 s), remarkable selectivity for n-butanol gas compared to other tested gases. Mechanism of 1D FeVO 4 nanofibers (550) for enhanced gas sensing properties is clarified. Thus, FeVO 4 nanofibers (550) are a potentially promising substitute to the sensing layer of gas sensors.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zeshuang Kong,Ruiqi Zhang,Jixian Dong,Jiahui Yu,Dafeng Zhang,Junchang Liu,Peiqing Cai,Xipeng Pu
With the increasing needs of people for a better life, the problem of water resources pollution has attracted wide attention. The construction of p-n heterojunction is an effective strategy to promote the removal of pollutants by photocatalysts. In this work, a series of BiOBr/Cu 2 S heterojunction photocatalysts with mass ratios of Cu 2 S have been synthesized successfully by a hydrothermal method combined with grinding method for photocatalytic degradation of tetracycline (TC) and ciprofloxacin (CIP). The results showed that BiOBr/Cu 2 S exhibited superior photodegradation efficiency of TC and ciprofloxacin CIP than BiOBr and Cu 2 S monomers. When the mass ratio of Cu 2 S is 0.15 %, the visible degradation of CIP and TC are 79.2 % in 90 min and 88.5% in 60 min. In addition, the effects of different inorganic ions and pH value on the photocatalytic performance of BiOBr/Cu 2 S were investigated. It was proved that superoxide free radical (•O 2 - ) was the main active species by free radical trapping experiment. The photocatalytic degradation process was further evaluated by total organic carbon and mass spectrometry tests. This work provides a feasible construction strategy for photocatalysts with potential application in water resources pollutants.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yun Liu,Guijiang Liu,Yanyan Yu,Yunying Wang
The burgeoning interest in single atom catalysts (SACs) stems from their exceptional oxidase-mimicking capabilities, driving substantial advancements in this field. Nevertheless, a critical knowledge gap remains regarding the influence of Zn incorporation on the oxidase-like activity of atomically dispersed Fe-N-C catalysts. This study successfully synthesized and comprehensively characterized three distinct SACs (FeZn SAC-N@C, Fe SAC-N@C, and Zn SAC-N@C) using TEM, HAADF-STEM, XRD, XPS, BET, ICP-MS, and XAFS techniques. Activity assays revealed that FeZn SAC-N@C exhibited the highest oxidase-mimicking activity, with Fe SAC-N@C displaying moderate activity, whereas Zn SAC-N@C did not exhibit oxidase-like behavior. The superior oxidase-like activity of FeZn SAC-N@C is attributed to its enhanced O 2 activation capacity, characterized by a high free energy of 0.90 eV in the rate-determining reaction step, surpassing those of Fe SAC-N@C (0.85 eV) and Zn SAC-N@C (0.71 eV). EPR and DFT calculations elucidated the catalytic mechanism of FeZn SAC-N@C, involving the generation of O 2 − radicals. As a proof-of-concept, FeZn SAC-N@C demonstrates potential as a colorimetric sensor for detecting ascorbic acid and nitrite, achieving a limit of detection of 0.77 μM for ascorbic acid and 0.16 μM for nitrite. These findings open a new avenue for configuring bimetallic atomically dispersed catalysts with oxidase-like activity in future research.
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ELECTROCHIMICA ACTA
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2024
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IF 5.5
Zhiran Sun,Shuhua Liu,Yajie Guo,Fuxian Zheng,Bing Nan,Wenjun Kang,Konggang Qu,Lei Wang,Rui Li,Zongge Li,Lile Dong,Haibo Li
The sluggish reaction kinetics of oxygen reduction reactions (ORR), combined with a long-standing dependence on expensive and unstable platinum-based catalysts, has significantly hindered the progress of sustainable energy solutions. Here, we have developed an atomically dispersed bimetallic FeCu-loaded N-doped porous carbon (Fe 1 Cu 1 -NC) catalyst for remarkable ORR efficiency. X-ray absorption fine structure (XAFS) analysis accurately determines that the coordination state of atomically dispersed Fe-Cu sites is a two-N-bridged with N 6 ligand. Fe 1 Cu 1 -NC has demonstrated superior ORR performance in alkaline environments when compared to commercial Pt/C catalysts. Notably, Fe 1 Cu 1 -NC exhibits a higher power density and specific capacity than Pt/C in zinc-air batteries. Density functional theory (DFT) calculations further confirm that the improved performance is due to the combined action of Cu and Fe single atoms, which results in a negative shift of the d -band center energy of Fe and facilitates activation of ORR intermediates.
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