INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Tianbiao Zeng,Jie Lin,Biao Wang,Binbin Guo,Yihong Ding,Chang Q. Sun
In an era where clean energy and sustainability are prioritized, water electrolysis for hydrogen production has become a focus of research. Ti-6Al-4 V alloy (Ti64) may support the catalyst due to its high mechanical strength, electrical conductivity, and resistance to alkali corrosion. However, its poor catalyst adhesion limits its application. Herein, a carbon layer was deposited on Ti64 (Ti64/C), before depositing the Co0.8Ni0.2(CO3)0.5(OH)·0.11H2O (CNCH) nanoneedles. The porous Ti64-H/C/CNCH electrode performs exceptionally well in the oxygen evolution reaction, achieving a current of 10 mA cm–2 at an overpotential of 131 mV with 90% IR compensation. Furthermore, the cell achieves a density of 10 mA cm–2 at 1.83 V and slow degradation after 45 h of continuous operation under overall water-splitting conditions. This study presents a method of fabricating high-performance water electrolysis electrodes by coating the metal surface with a carbon layer under the catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Si Liu,Zixuan Xu,Qun Liao,Xingxing Zheng,Xionghui Fu,Yuanming Zhang,Yi Zhu
Co₃O₄/TiO₂ achieves a CH₄ yield of 34.8 μmol g −1 h −1 with 82.4% selectivity. • Ti–O–Co bonds serve as charge transfer channels in Co₃O₄/TiO₂. • Co 2+ /Co 3+ redox couples stabilize *CO intermediates and facilitate PCET. • Electron transfer promotes Co electron enrichment for *CO stabilization. • Synergistic electron transfer and proton supply promote selective CO₂ methanation. Value-added conversion of CO 2 using solar energy is a sustainable strategy to address the energy crisis and environmental issues simultaneously. In this work, Co 3 O 4 /TiO 2 composite photocatalysts were successfully prepared by a hydrothermal method. The optimized Co 3 O 4 /TiO 2 achieves a CH 4 yield of 34.8 μmol·g −1 ·h −1 with 82.4% selectivity. The enhanced catalytic activity is ascribed to interfacial Ti-O-Co bonds that facilitate electron transfer toward Co sites, thereby modulating the Co 2+ /Co 3+ electronic environment and creating relatively electron-rich Co sites for *CO stabilization, while the Co 3 O 4 component facilitates the proton-coupled electron transfer (PCET) process toward CH 4 formation. This study provides a practical strategy for promoting the value-added photocatalytic conversion of CO 2 using multivalent transition metal oxide composite photocatalysts. Co 3 O 4 /TiO 2 enables highly selective photoreduction of CO 2 into CH 4 . Ti-O-Co bonds serve as pathways transferring photogenerated electrons from TiO 2 to Co sites. The electron-rich Co centers act as active sites to stabilize *CO intermediates. Meanwhile, Co 3 O 4 promotes water oxidation and maintains sufficient proton supply, synergistically facilitating CH 4 production. Download: Download high-res image (200KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yinye Chen,Zhen Zhang,Xin Wang,Yidian Lin,Jiachang Zuo,Xuhui Yang,Songhua Chen,Yongjin Luo,Qingrong Qian,Qinghua Chen
In the oxidation reaction of volatile organic compounds catalyzed by metal oxides, distinguishing the role of active metal sites and oxygen mobility at specific preferentially exposed crystal planes and diverse temperatures is challenging. Herein, Co3O4 catalysts with four different preferentially exposed crystal planes [(220), (222), (311), and (422)] and oxygen vacancy formation energies were synthesized and evaluated in styrene complete oxidation. It is demonstrated that the Co3O4 sheet (Co3O4–I) presents the highest C8H8 catalytic oxidation activity (R250 °C = 8.26 μmol g–1 s–1 and WHSV = 120,000 mL h–1 g–1). Density functional theory studies reveal that it is difficult for the (311) and (222) crystal planes to form oxygen vacancies, but the (222) crystal plane is the most favorable for C8H8 adsorption regardless of the presence of oxygen vacancies. The combined analysis of temperature-programmed desorption and temperature-programmed surface reaction of C8H8 proves that Co3O4–I possesses the best C8H8 oxidation ability. It is proposed that specific surface area is vital at low temperature (below 250 °C) because it is related to the amount of surface-adsorbed oxygen species and low-temperature reducibility, while the ratio of surface Co3+/Co2+ plays a decisive role at higher temperature because of facile lattice oxygen mobility. In situ diffuse reflectance infrared Fourier spectroscopy and the 18O2 isotope experiment demonstrate that C8H8 oxidation over Co3O4–I, Co3O4–S, Co3O4–C, and Co3O4–F is mainly dominated by the Mars–van Krevelen mechanism. Furthermore, Co3O4–I shows superior thermal stability (57 h) and water resistance (1, 3, and 5 vol % H2O), which has the potential to be conducted in the actual industrial application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Tiantian Chen,Zhenyang Yu,Ting Xu,Rong Xiao,Wenhai Chu,Daqiang Yin
Sulfate radical (SO 4 ·- )-based advanced oxidation processes (AOPs) attract increasing attention in the control of micropollutants. However, SO 4 ·- can react with other chemicals present in water and result in undesired oxidation by-products (OBPs) generation. The formation and degradation mechanisms of CX 3 R-type OBPs during cobalt catalyzed peroxymonosulfate (Co 2+ /PMS) oxidation were investigated. In the formation of CX 3 R-type OBPs, both Co 3+ and SO 4 ·- could convert chloride to free chlorine that then reacted with natural organic matter, leading to the formation of CX 3 R-type OBPs. The concentrations of trichloromethane, chloral hydrate, dichloroacetonitrile, dichloroacetamide and trichloroacetamide after 15 min reaction were 9.8, 3.9, 1.2, 5.9 and 22.3 nM, respectively. Compared to SO 4 ·- , Co 3+ played a more significant role in the CX 3 R-type OBP formation and calculated toxicity values of CX 3 R-type OBPs. CX 3 R-type OBPs could not only be formed but also be degraded at the same time during Co 2+ /PMS oxidation. As for the degradation of CX 3 R-type OBPs, both Co 3+ and SO 4 ·- could transform CX 3 R-type OBPs to chloride. Compared to Co 3+ , SO 4 ·- played a more important role in the degradation of CX 3 R-type OBPs and the conversion from chloride to final by-product chlorate. The adverse effects that results from Co 3+ need more attention in SO 4 ·- -based AOPs application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Jianmin Chen,Qilu Yao,Jia Zhu,Xiangshu Chen,Zhang-Hui Lu
Bimetallic Rh–Ni nanoparticles (NPs) immobilized on the cerium hydroxide carbonate (Ce(OH)CO 3 ) have been successfully prepared by a facile co-reduction route, and characterized by XRD , SEM , TEM , EDX, ICP , XPS , and TG-DTA. The as-synthesized Rh–Ni/Ce(OH)CO 3 nanocomposites (NCs) with different metal compositions were applied as the highly efficient catalysts for hydrogen generation from the alkaline solution of hydrazine (N 2 H 4 ). Especially, the Rh 55 Ni 45 /Ce(OH)CO 3 NCs exerted the highly activity and 100% H 2 selectivity for the decomposition of hydrazine, providing high turnover frequency (TOF) values of 150 h −1 at 30 °C and 395 h −1 at 50 °C, respectively, relative high values for the metal catalysts . The activation energy for the decomposition of hydrazine catalyzed by Rh 55 Ni 45 /Ce(OH)CO 3 NCs was measured to be 38.8 kJ/mol, lower than most of the values reported for this reaction using many different catalysts. This excellent catalytic performance could be attributed to not only the strain and ligand effects between Rh and Ni, but also the strong interaction between RhNi NPs and Ce(OH)CO 3 support. Such a highly catalyst may greatly encourage the practical application of hydrazine as a hydrogen storage material.
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Gang Wu,Shasha Liu,Jie Ren,Jiawei Zhu,Yun Yu,Suzana Yusup,Dengyu Chen,Shu Zhang,Yong Huang
The development of efficient and recyclable heterogeneous catalysts for the catalytic conversion of cellulose into high-value platform chemicals has garnered significant attention. Cobalt sulfide, recognized for its earth-abundance and recyclability, has emerged as a promising catalyst for the production of methyl levulinate (ML) from cellulose, albeit with a noted disparity in catalytic performance when compared to conventional homogeneous catalysts. In this study, various phosphorus-doped cobalt sulfides (CoS x P 2-x ) were employed to enhance the production of ML from cellulose, with a particular focus on the sulfide-phosphorus ratio. Notably, an optimal ML yield of 48.9 wt% and a complete conversion of cellulose were achieved at a sulfide-to-phosphorus ratio of 1:1. Comprehensive characterization of the synthesized CoS x P 2-x materials revealed that CoS 1.00 P 1.00 exhibited distinctive properties, such as the presence of ternary acid sites and the lowest Co 3+ /Co 2+ ratio among the series. Density functional theory (DFT) calculations elucidated that the bound electrons within the P-Co bonds were activated by the synergistic effects among Co, P, and S atoms, thereby diminishing the free energy barrier for the adsorption of reaction intermediates.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Feng Xie,Jian-Feng Guo,Hai-Tao Wang,Na Chang
As a typical semiconductor, ZnO is considered as a favorable photocatalyst due to its excellent photoelectrochemical properties. However, low response of visible light and the recombination of photoinduced carriers limits its application in photocatalysis . Herein, a novel, robust and recyclable heterogeneous photocatalyst based on flower-like Co doped ZnO microspheres was presented without changing the hierarchical morphology. The crystal structure, light absorption , and electrochemical performance were systematically investigated, and the response of Co doped ZnO to visible light significantly enhanced with the gap band reduced from 3.20 eV to 2.54 eV. Due to the transformation of Co 2+ to Co 3+ , more oxygen vacancies were produced, with more photoinduced electrons transferring to Co 3+ which would greatly inhibit the recombination of photoinduced electrons and holes and improve photocatalytic activity. 2-Mercaptobenzothiazole (MBT) which is considered as a long half-life intermediate of antibiotic medicine is chosen as a target. As a result, the 7% Co-ZnO photocatalyst exhibited excellent photocatalytic activity for the degradation of MBT with the rate constant of 0.1498 min −1 and removing ratio of 97.3% in 50 min. The formation of excess oxygen vacancies and the conversion between Co 2+ to Co 3+ were further identified by XPS analysis . This work provides new sights for doping transition metal with different chemical valence in semiconductors for producing oxygen vacancy and improving the photocatalytic efficiency.
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 13
·2628-2636
·
IF 7
Lixia Wang,Meilin Huang,Mingcheng Gao,Tayirjan Taylor Isimjan,Xiulin Yang
Effective control of strong electron interaction at heterogeneous interfaces is crucial for the creation of highly efficient and stable bifunctional catalysts for water splitting. In this work, we synthesized an urchin-like CoP–Ce2(CO3)2O catalyst on nickel foam (CoP–Ce2(CO3)2O/NF) via a facile hydrothermal and gas-phase phosphating process, which enhances active site exposure and improves catalytic reaction kinetics. Spectroscopy analysis reveals that the enhanced performance is due to the charge transfer between CoP and Ce2(CO3)2O and the unique urchin-like structure of the hybrid catalyst. The CoP–Ce2(CO3)2O/NF catalyst showed excellent hydrogen/oxygen evolution reaction (HER/OER) performance (η10 = 85.2 and 205.5 mV) and robust long-term stability in 1.0 M KOH. Additionally, the CoP–Ce2(CO3)2O/NF(+)||CoP–Ce2(CO3)2O/NF(−) electrolyzer required only a low cell voltage of 1.82 V to produce 100 mA cm−2 for overall water splitting, outperforming most previous catalysts. This work presents a strategy for interfacial engineering to improve the activity of bifunctional heterojunction electrocatalysts for overall water splitting.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yi Han,Hongdong Li,Mingjuan Zhang,Yunlei Fu,Yanru Liu,Yu Yang,Jixiang Xu,Yanling Geng,Lei Wang
The development of relatively inexpensive and highly active electrocatalyst for water splitting is essential to the energy conversion and sustainable economic improvement. In this work, based on nanostructure engineering, the CoSe 2 -Ni 3 Se 2 nanoparticles coated Co(CO 3 ) 0.5 (OH)·0.11H 2 O nanoneedles supported on the surface of Ni foam (NF) composite (CoSe 2 -Ni 3 Se 2 /NF) had been synthesized by a facile hydrothermal selenization method. Benefiting from the adequate nanostructure and moderate degree of selenization treatment, the obtained sample CoSe 2 -Ni 3 Se 2 /NF-0.4 using 0.4 g Se powder as selenium source shows remarkable electrocatalytic performance and electrochemical stability for either hydrogen evolution reaction (HER) or oxygen evolution reaction (OER). CoSe 2 -Ni 3 Se 2 /NF-0.4 only required 98 mV (vs. RHE) to reach the 10 mA cm −2 for HER and 344 mV (vs. RHE) to reach 100 mA cm −2 for OER in 1.0 M KOH solution. This work provides a simple strategy to controllably synthesize transitional metal diselenium-based electrocatalyst with adjustable amount of active phase, which are very important for the future development of the bifunctional electrocatalyst.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Yanghai Gui,Jintao Wu,Di Zhao,Kuan Tian,Shuaishuai Zhao,Huishi Guo,Xiaoyun Qin,Xiaomei Qin,Dongjie Guo,Yun Wang
H 2 S gas sensors with facile preparation, low detection limits, and high selectivity are crucial for environmental and human health monitoring. However, it is difficult to maintain a high response of H 2 S gas sensors under high humidity in practical applications. To face this dilemma, a layer-by-layer growth method is applied to in situ prepare a nanostructured Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 coated by a hydrophobic hierarchical ZIF-67 as the H 2 S sensor. This novel composite exhibits excellent humidity immunity without sacrificing the excellent sensitivity and selectivity of H 2 S. At a low operating temperature of 90 °C, a remarkable response value of 1052.3 to 100 ppm H 2 S has been achieved, which is 779 and 9.36 times higher than that of pure WO 3 and Co(CO 3 ) 0.5 (OH)·0.11H 2 O/WO 3 , respectively. More importantly, an 82.2% relative response value remains at a high humidity of 75%RH. The sensing mechanisms are investigated using gas chromatography-mass spectrometry (GC-MS), which revealed that the reaction products are H 2 O and SO 2 . The high humidity immunity and fast response of the Co(CO 3 ) 0.5 (OH)·0.11H 2 O@ZIF-67/WO 3 demonstrate the layer-by-layer in situ synthesis method holds the potential application for the development of high-performance WO 3 -based H 2 S sensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jiahe Zhai,Hui Wang,Abdelkader Labidi,Long Zeng,Yu Huang,Chuanyi Wang
Removing low-concentration NO in the air by means of photocatalytic technology is a promising approach. Herein, our work pins down the mechanism of cobalt metal doping within the lattice of Bi 4 Ti 3 O 12 (BTO) for the photocatalytic NO conversion. As a result, the Co-BTO exhibits a NO conversion efficiency of 58.3 %, which is substantially higher than that of BTO (30 %). More interestingly, the Co-BTO also shows a lower production of intermediate NO 2 than that of the BTO. These findings demonstrate that within Co-BTO, both Co²⁺ and Co³ ⁺ coexist. The redox cycle between these two cobalt species engenders active sites possessing strong reducing capabilities for O₂ which can be adsorbed and activated at the Co sites, thereby generating superoxide radicals (•O₂⁻). Furthermore, the doping of a certain portion of cobalt broadened light absorption and enhanced the separation efficiency of photogenerated carriers, further facilitating the activation of O₂. Lastly, electron spin resonance (ESR) and in-situ diffuse reflective infrared Fourier transform spectroscopy (in-situ DRIFTS) were respectively utilized to further clarify the active species involved in the photocatalytic oxidation of NO and its adsorption and conversion pathways from a mechanistic standpoint. Overall, this work represents a novel endeavor for the advancement of visible-light-driven photocatalysts usage for environmental remediation against NO pollution.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）