Catalysts
·
2024
·Vol. 14
·期 6
·364
·
IF 3.8
Qiaoting Cheng,Hu Ding,Lang Chen,Jiatong Dong,Hao Yu,Shen Yan,Hua Wang
The two-electron oxygen reduction reaction (2e−ORR) has emerged as an attractive alternative for H2O2production. Developing efficient earth-abundant transition metal electrocatalysts and reaction mechanism exploration for H2O2production are important but remain challenging. Herein, a nitrogen-doped carbon-coated NiSe2(NiSe2@NC) electrocatalyst was prepared by successive annealing treatment. Benefiting from the synergistic effect between the NiSe2nanoparticles and NC, the 2e−ORR activity, selectivity, and stability of NiSe2@NC in 0.1 M HClO4was greatly enhanced, with the yield of H2O2being 4.4 times that of the bare NiSe2nanoparticles. The in situ Raman spectra and density functional theory (DFT) calculation revealed that the presence of NC was beneficial for regulating the electronic state of NiSe2and optimizing the adsorption free energy of *OOH, which could enhance the adsorption of O2, stabilize the O-O bond, and boost the production of H2O2. This work provides an effective strategy to improve the performance of the transition metal chalcogenide for 2e−ORR to H2O2.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hui Li,Xinlei Ren,Wenxue Pan,Shiting Zhu,Jin Zhang,Zhiyuan Yang,Liu Qian,Yueying Wang,Yujing Huang,Lin Guo,Minghui Xiang
The reasonable control of the structure of metal–organic frameworks (MOFs) is a promising strategy for improving their peroxymonosulfate (PMS) activation activity. In this study, ZIF-67 @ZIF-8 was used as a template to prepare bimetallic core–shell Co-Fe@NC via Fe doping and high-temperature carbonization . Co-Fe@NC maintained the core–shell structure of the original MOF, in which cobalt was uniformly distributed in the nitrogen-doped graphite carbon skeleton and the surface of the graphite carbon skeleton was covered with iron. With the synergistic effect of the nitrogen-doped graphite carbon skeleton, iron, and cobalt, 100% of tetrabromobisphenol S (TBBPS) was removed in 60 min with k obs = 0.062 min −1 in Co-Fe@NC-0.2/PMS system. The addition of iron increased the graphitization degree with I D /I G value increased from 0.98 (Co@NC) to 1.034 (Co-Fe@NC-0.2) and electron transfer rate of the carbon skeleton. Besides, the Co leaching was effectively attenuated from 1.86 mg/L(Co@NC) to 0.78 mg/L (Co-Fe@NC-0.2) by the core-shell structure and bimetal strategy. Both O 2 · - and 1 O 2 contributed to the degradation of TBBPS according to quenching experiments. TBBPS was deeply degraded into small-molecule compounds through three degradation pathways by the Co-Fe@NC-0.2/PMS system. This study provides a new strategy for designing highly efficient bimetal–carbon composites for environmental remediation.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yuan Fang,Shiyu Ji,Xin Wu,Jianfeng Zhu
Passive direct liquid fuel cells are promising power generation devices with the advantages of convenient transportation, storage for liquid fuel and high power density. This paper focuses on improving the intrinsic electrocatalytic performance and durability of nitrogen-doped carbon (N-C) cathodic electrocatalysts. Then, lamellar structured Ce-S-NC heterogeneous electrocatalyst was synthesized and used as a highly durable cathode for two types of passive direct liquid fuel cells, i.e. , direct methanol fuel cells (DMFCs) and direct borohydride fuel cells (DBFCs). In this work, the effect of the S/C molar ratio on the microstructure and electrocatalytic performance of the Ce-S-NC electrocatalysts was investigated, and excellent intrinsic oxygen reduction reaction activity was obtained at an S/C molar ratio of 0.15. The peak power densities of Ce-S-NC based DMFCs reached up to 12.5, 23.6 and 41.9 mW·cm −2 at 20, 40 and 60 °C, respectively. The peak power densities of 59.3, 84.6 and 132.6 mW·cm −2 were obtained in Ce-S-NC based DBFCs at 20, 40 and 60 °C, respectively. In the durability tests, both the Ce-S-NC based air-breathing DBFCs and passive DBFCs showed the stable operation than that of N-C and Ce-NC. When the current density increased from 50 to 150 mA·cm −2 , the Ce-S-NC based DBFC can be operated for 882 h, and only 34 and 91 h for that of N-C and Ce-NC. The electrochemical impedance spectroscopy tests proved Ce-S-NC based DBFC showed the faster mass transfer efficiency. The outstanding durability of Ce-S-NC is mainly attributed to the improved defect density and mass transfer.
研究领域:
材料科学
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能源科学
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电化学
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 10
·1647-1655
·
IF 2.232
Duan Meng-ting,Wu Meng-rong,Xue Kai,Bian Zheng-xu,Shi Jing,Guo Xing-mei,Cao Fu,Zhang Jun-hao,Kong Qing-hong,Zhang Feng
To improve the sulfur loading capacity of lithium-sulfur batteries (Li-S batteries) cathode and avoid the inevitable “shuttle effect”, hollow N doped carbon coated CoO/SnO 2 (CoO/SnO 2 @NC) composite has been designed and prepared by a hydrothermal-calcination method. The specific surface area of CoO/SnO 2 @NC composite is 85.464 m 2 ·g −1 , and the pore volume is 0.1189 cm 3 ·g −1 . The hollow core-shell structure as a carrier has a sulfur loading amount of 66.10%. The initial specific capacity of the assembled Li-S batteries is 395.7 mAh·g −1 at 0.2 C, which maintains 302.7 mAh·g −1 after 400 cycles. When the rate increases to 2.5 C, the specific capacity still has 221.2 mAh·g −1 . The excellent lithium storage performance is attributed to the core-shell structure with high specific surface area and porosity. This structure effectively increases the sulfur loading, enhances the chemical adsorption of lithium polysulfides, and reduces direct contact between CoO/SnO 2 and the electrolyte.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 20
·5864-5869
·
IF 4.033
Ningning Zhou,Guowen Meng,Zhulin Huang,Yan Ke,Qitao Zhou,Xiaoye Hu
This report presents a simple and inexpensive fabrication approach to a flexible transparent composite film as a “cut-and-paste” surface-enhanced Raman scattering (SERS) substrate for in situ detection of organic pollutants. First, a self-assembled monolayer of Ag-nanocubes (Ag-NCs) is obtained at the air/water interface. Then, the Ag-NC monolayer is retrieved onto a flexible transparent polyethylene (PE) film to achieve an Ag-NC@PE composite film as a flexible SERS substrate. As the Ag-NCs in the monolayer are closely and uniformly packed on the PE film, the Ag-NC@PE composite film shows high SERS-activity with good signal homogeneity and reproducibility. Furthermore, the flexible transparent Ag-NC@PE composite film is “cut into” small pieces and directly “pasted” onto contaminated fruits for in situ SERS detection, as a result 10 nM thiram, 1 μM 4-polychlorinated biphenyl and 10 nM methyl parathion contaminants on oranges are detected, respectively. Therefore the Ag-NC@PE composite film is an inexpensive and effective SERS substrate for rapid in situ detection of organic pollutants in aqueous solutions, on fruits and other solid objects.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 3
·779-789
·
IF 2.936
Guo Guangkai,Zhong Dazhong,Zhao Tao,Liu Guang,Li Jinping,Zhao Qiang
It is important to develop active, stable, and cost-effective electrocatalysts for highly efficient overall water splitting. Metal organic frameworks were considered as efficient precursors for overall water splitting catalysts. In this paper, NC/Ni–Co 3 O 4 @Co 1−x S with small size is obtained from ZIF-67. NC/Ni–Co 3 O 4 @Co 1−x S materials exhibit superior overall water splitting properties, with a low overpotential of 170 mV for the hydrogen evolution reaction at 10 mA cm −2 and 210 mV for the oxygen evolution reaction at 10 mA cm −2 and long-term stability. Furthermore, the overall water splitting only requires 1.64 V to drive the current density of 10 mA cm −2 , when the NC/ Ni–Co 3 O 4 @Co 1−x S are used as both anode and cathode. NC/Ni–Co 3 O 4 @Co 1−x S has excellent electrocatalytic activity due to its nanosheet structure, which greatly increases the electrochemically active surface area and the NC/Ni–Co 3 O 4 @Co 1−x S has good electrical conductivity and abundant Co 3+ sites, so the electrocatalytic activity is significantly enhanced. This study provides a new idea for the design and synthesis of novel composite electrocatalysts. Graphical
研究领域:
材料科学
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电化学
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能量转换
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纳米技术
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催化
✓ 已验证
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 4
·1090-1099
·
IF 8.183
Wang Yiyan,Kumar Anuj,Ma Mang,Jia Yin,Wang Yu,Zhang Ying,Zhang Guoxin,Sun Xiaoming,Yan Zifeng
Carbon materials featuring hierarchical pores and atomically dispersed metal sites are promising catalysts for energy storage and conversion applications. Herein, we developed a facile strategy to construct functional carbon materials with a fluffy peony-like structure and dense binary FeCo-N x active sites (termed as f-FeCo-CNT). By regulating the metal content in precursors, a three-dimensional (3D) interconnected conductive carbon nanotubes network was in-situ formed throughout the atomically dispersed FeCo-NC matrix during pyrolysis. Taking advantage of rich pore hierarchy and co-existence of highly active FeCo-N x sites and beneficial FeCo alloy nanoparticles, the f-FeCo-CNT material exhibited excellent bifunctional performance towards oxygen reduction reaction/oxygen evolution reactions (ORR/OER) with respect to the atomically dispersed FeCo-NC (SA-f-FeCo-NC) and commercial Pt/C+RuO 2 mixture, surpassing the SA-f-FeCo-NC with a 20 mV higher ORR half-wave potential and a 100 mV lower OER overpotential (at 10.0 mA/cm 2 ). Remarkably, the f-FeCo-CNT-assembled Zn-air battery (ZAB) possessed a maximum specific power of 195.8 mW/cm 2 , excellent rate capability, and very good cycling stability at large current density of 20.0 mA/cm 2 . This work provides a facile and feasible synthetic strategy of constructing low-cost cathode materials with excellent comprehensive ZAB performance.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xue Sun,Fang Li,Zhimiao Wang,Hualiang An,Wei Xue,Xinqiang Zhao,Yanji Wang
Well-dispersed AuPd nanoparticles were immobilized on TiO 2 -NC supports derived from NH 2 -MIL-125(Ti) and used as highly active, stable catalysts for hydrogen production from formic acid under mild conditions. The highest total turnover frequency , i.e., 3207 h −1 , for formic acid dehydrogenation was achieved with Au 2 Pd 8 /TiO 2 -NC-800 as the catalyst at 60 °C; this is 1.4 times that achieved with Au 2 Pd 8 /TiO 2 –C-800 under the same conditions. The excellent performance of the Au 2 Pd 8 /TiO 2 -NC-800 catalyst originates from the high anatase TiO 2 content, pyridinic N and oxygen vacancies in the support, the small size and alloying effect of the AuPd nanoparticles, and the metal–support synergistic effect . Doping the support with N improves the catalyst stability because N prevents metal particle aggregation to some extent. These results provide guidelines for the future development and applications of catalysts based on TiO 2 and metal–organic-framework-derived carbon-based materials.
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yan Chen,Yufan Liu,Huizhen Jin,Xinyue Wang,Guowen Wang,Hongchao Ma,Vadivel Subramaniam,Krishnamoorthy Ramachandran,Xinghui Liu
Antibiotic drugs are biotoxic and difficult to degrade, causing irreversible effects on aquatic environment and human health. The photoelectrocatalytic (PEC) process is regarded as a promising strategy for simultaneously addressing environmental pollution and the energy crisis. Herein, a plum tree-type composite semiconductor photoanode MnOx@Co/NC-x with core-shell heterostructures was constructed to evaluate the PEC activity for sulfamethoxazole (SMX). The synergistic effects of Co nanoparticles, a high content of graphitic N, an open framework, and interfacial structures played a decisive role in improving the PEC activity of the MnOx@Co/NC-x system. The engineered micro-nano structure significantly improved the specific surface area and conductivity of electrode materials, and promoted the diffusion of electrolyte. Among them, MnOx@Co/NC-500 photoanode exhibited the best performance (reached 98.92% in 50 min), cyclic stability and repeatability. The results showed that it was feasible to construct a high-performance heterostructural interface for pollutant treatment based on micro-nano structure regulation and valence band matching.
研究领域:
环境催化
·
材料化学
·
环境污染治理
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纳米材料
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电化学
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光化学
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药物降解
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Manting Zhang,Tingting Zhou,Danil Bukhvalov,Fengyan Han,Caiqin Wang,Xiaofei Yang
Tri-functional PtCo/NC nanocatalysts were assembled via in-situ integration with ultralow Pt loading supported on ZIF-67 derived porous carbon material, and used as electrocatalysts for oxygen reduction reaction (ORR), ethanol oxidation reaction (EOR), hydrogen evolution reaction (HER). Detailedly, PtCo-3/NC with ultralow Pt loading (1 wt%) exhibits the halfwave potential of 0.877 V for ORR in acidic media and considerable current density for both ORR and EOR at 0.85 V, and low overpotential (η 10 =10 mV) for HER. The as-assembled zinc-air batteries (ZABs) based on PtCo/NC have higher power density than Pt/C based ZABs. DFT calculation reveals the strong metal-support interactions (MSI) in PtCo/NC, which leads to the change of electronic state, redistribution of charge density and optimization of free energy , allowing it to present greater performances than Pt/C. This work highlights the possibility of using it as highly effective electrode catalysts with ultralow Pt loading in fuel cells and metal-air battery.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xiangrong Zeng,Hongyu Xiao,Yaxuan Lei,Sifei Ye,Peng Liu,Zhuohua Kong,Yangping Wen,Guixia Tan,Xia Gong,Mingfang Li
The simultaneous electrochemical detection of catechol (CC) and hydroquinone (HQ) isomers is hindered by overlapping voltammetric signals, creating a persistent sensitivity-selectivity-accuracy paradox. Herein, we present a synergistic sensing platform integrating BC-Co@NC nanoarchitectures (engineered via topotactic carbonization to form 3D hierarchical pores with atomically dispersed Co-N 4 sites) and a first- and second-derivative voltammetry cascade (FS-DVC) optimized by Savitzky-Golay algorithm. This dual-engine strategy achieves 152 mV interpeak separation, ultra-low limits of detection (0.09 nM for CC, 0.12 nM for HQ), a linear range spanning four orders of magnitude (0.3-500 μM), and robust performance in environmental matrices (95.2-99.1% recoveries in agricultural water/soil). This work establishes a new paradigm for electrochemical isomer discrimination through the synergistic fusion of tailored material design and advanced signal mathematics.
研究领域:
电化学
·
纳米材料
·
分析化学
·
信号处理
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Peng Guo,HongWei Li,BoYu Huang,Dong Ji,GuiXian Li,XinHong Zhao
Despite nitrogen-doped carbons (NC) enhancing metal–support interactions (MSI) in electrocatalysts, how specific N-configurations (pyridinic, pyrrolic, and graphitic) synergistically govern methanol oxidation reaction (MOR) pathways over Pd surfaces remains unknown. Herein, we hypothesize that precise thermal programming of ZIF-8 pyrolysis can tailor synergistic pyridinic-pyrrolic-graphitic N-triads to simultaneously enhance activity, CO tolerance, and stability. Guided by DFT predictions, Pd/NC-T catalysts (T = 700–1100) were synthesized, where in situ pyrolysis controls N-configurations (validated by XPS) and wet impregnation immobilizes ultrafine Pd nanoparticles (3.6 ± 0.8 nm). Furthermore, experimental and theoretical analyses reveal that pyrrolic-N facilitates the adsorption of methanol on Pd, while pyridinic-N suppresses the CHO* → CO* reaction pathway, thus enhancing the catalyst’s tolerance to poisoning, and graphitic-N prevents support dissolution and collapse during the electrocatalytic reaction, thus mitigating active site loss. Notably, Pd/NC-900 achieves 4195.0 mA·mg–1Pd in the alkaline electrolyte, maintaining 80.5% of its initial current density after 500 cycles at 200 mV/s, highlighting its exceptional catalytic activity and long-term stability. This work offers profound insights into the intricate MSI, serving as a crucial framework for guiding the future design and advancement of MOR electrocatalysts.
研究领域:
电化学
·
催化
·
材料科学
·
纳米技术
·
表面化学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）