Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Qianyu Chu,Guangmin Ren,Jingdan Zhao,Xiangchao Meng,Jie Meng,Zizhen Li
The photocatalytic nitrogen reduction reaction (NRR) is a sustainable green alternative to the Haber–Bosch process for ammonia production. However, due to the inert properties of dinitrogen, the photocatalytic activity in N2 reduction is still pretty low. Based on density functional theory calculations, this study finds that the formation energy of oxygen vacancies around the V site in InVO4 was significantly lower than that around the In site. This indicated that the V–O bond was thermodynamically less stable and tends to break preferentially. Therefore, selective cleavage of the V–O bond was achieved by subjecting InVO4 to transient high-temperature treatment via rapid Joule heating technology. This resulted in the directed construction of an InVO4-JH catalyst enriched with oxygen vacancies and exposing coordination-unsaturated V sites. The resulting InVO4-JH catalyst delivered a photocatalytic ammonia production rate of up to 35.28 μmol g−1 h−1 under ambient conditions without any sacrificial agent, while exhibiting excellent stability and reaction selectivity. Mechanistic studies and structural characterization confirmed that the formation of oxygen vacancies via V–O bond cleavage releases electrons, which reduce adjacent V5+ to V4+. This created localized electron-rich regions at exposed V sites. Theoretical calculations further confirmed that these exposed V sites act as the active centers of the reaction, not only significantly enhancing nitrogen adsorption but also substantially lowering the energy barrier of the hydrogenation step through alternative reaction pathways. This work provides a novel strategy for the rational design of highly efficient defect-engineered catalysts via targeted bond cleavage.
研究领域:
材料化学
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光催化
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无机化学
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能源化学
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环境催化
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纳米材料
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2023
·
IF 12.4
Hao Lin,Yang Xu,Xiao Chen,Zengxian Fang,Tian Yan,Kaijie Ma,Le Liu,Jingyu Xi
Vanadium flow batteries (VFBs) face a challenge with the low reaction rates of the V(II)/V(III) redox couple, which limits the performance of VFBs. Additionally, the negative electrode in VFBs is often accompanied by the persistent hydrogen evolution reaction (HER), which is difficult to eliminate. Therefore, understanding the spatial distribution of activity on the negative electrode and the HER side reaction on the electrode surface is of critical importance. This study proposes a weak measurement imaging method to characterize the spatial distribution of surface activity and HER onset potential on the negative electrode in VFBs). This method enables the visualization and in situ detection of key parameters such as the absolute values of |i pa |, |i pc |, |∆E|, |i pc /i pa |, and the HER onset potential. By comparing three different types of graphite felts with varying activity levels, it validates the feasibility of this method. Furthermore, electrochemical stability tests are conducted to study the electrodes repeatability, uniformity, and durability. This method holds promise in guiding the design of electrodes with enhanced activity, good reversibility, minimized HER side reactions, and uniform distribution.
研究领域:
能源存储
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电化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2013
·
IF 1.789
Juan Liu,Wenbin Guo,Fengdong Qu,Caihui Feng,Chao Li,Linghui Zhu,Jingran Zhou,Shengping Ruan,Weiyou Chen
Pristine and vanadium-doped In 2 O 3 nanofibers were fabricated by electrospinning and their sensing properties to H 2 S gas were studied. X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the inner structure and the surface morphology . The H 2 S-sensing performances were characterized at different temperatures ranging from 50 to 170 °C. The sensor based on 6 mol% V-doped In 2 O 3 nanofibers exhibit the highest response, i.e. 13.9–50 ppm H 2 S at the relatively low temperature of 90 °C. In addition, the fast response (15 s) and recovery (18 s) time, and good selectivity were observed.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuya Zhang,Qiming Chen,Qianqiao Wang,Xinyu Luo,Mingjun Cen,Wenchao Peng,Yang Li,Qicheng Zhang,Xiaobin Fan
The electrochemical oxygen reduction reaction (ORR) plays a crucial role in air-breathing energy conversion systems. However, its kinetics are constrained by a multistep proton-coupled electron transfer process, wherein the adsorption of the OOH* introduces high energy barriers. Herein, we present N-doped carbon-supported ultrafine V-incorporated Fe 3 C nanoparticles (V-Fe 3 C@NC) featuring abundant Fe coupling with V, serving as reaction sites for efficient ORR. Experimental characterizations confirm the incorporation of V species leads to a significant enhancement in ORR kinetics. The prepared V-Fe 3 C@NC electrocatalyst demonstrates exceptional ORR activity with a half-wave potential of 0.91 V. Density functional theory calculations elucidate that the synergy between Fe and V sites facilitates direct O–O bond breakage, circumventing the formation of the OOH* and resulting in lower ORR energy barriers. Moreover, the aluminum-air (Al-air) batteries derived from ultrafine V-Fe 3 C@NC nanoparticles display outstanding performance with a high open-circuit voltage of 1.92 V and a large specific capacity of 2309 mAh g −1 under the air environment. The elucidation and understanding of synergy in dual reaction sites present a novel approach for the rational design of supported metal nanoparticle electrocatalysts for energy-related applications.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 2
·429
·
IF 2.849
Qintao Yang,Liang Gong,Lili Huang,Qinglin Xie,Yijian Zhong,Nanchun Chen
A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Xiaoying Yu,Chunhong Gao,Jinjia Liu,Jiang Wang,Meilin Jia,Gala Sa,Aiju Xu
Photocatalytic technology has good stability and ecological friendliness which is used to treat organic pollutants in wastewater. In this paper, TiO 2 , 1.5%V–TiO 2 and N, V co-doped TiO 2 were synthesized by hydrothermal method for photocatalytic degradation of tetracycline. Meanwhile, XRD , HRTEM , SEM, FT-IR, XPS, UV–Vis DRS , PL and electrochemistry tests were used to characterize the catalysts. The results showed that the appropriate amount of N, V co-doped can cause structural changes of TiO 2 . The co-doped of N and V enhanced the photocurrent response of TiO 2 , increased the specific surface area, reduced the band gap, and improved the efficiency of photodegradation of tetracycline. Accordingly, the tetracycline photocatalytic degradation path was proposed. 6%N-1.5%V–TiO 2 completely degraded tetracycline into CO 2 , H 2 O and NO 3 − . The calculation results show that an appropriate amount of N, V co-doped TiO 2 decreased bandgap, improved the optical absorption performance of TiO 2 . This work demonstrated the potential of N, V co-doped to design efficient photocatalysts .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 3
·1062-1070
·
IF 8.64
Wang Yang,Chen Sai,Sun Jiachen,Xie Yufei,Zhao Zhi-Jian,Pei Chunlei,Gong Jinlong
Supported vanadium oxides (VO x ) are alternative candidates for non-oxidative propane dehydrogenation (PDH) owing to their competitive performance. This paper describes the roles of V−O sites on PDH over monomeric VO x species supported on ZrO 2 , Al 2 O 3 and SiO 2 . With the control of pre-reduction, stable structures of V−O sites are obtained for PDH, including V−O-support (V−O−S), V−OH and V=O sites. By tuning the V densities over individual support, the propylene formation rate shows a linear correlation with the number of the V−O−S site, which indicates the V−O−S site plays a decisive role in PDH rather than V−OH and V=O sites. Moreover, the specific activity per V−O−S site over ZrO 2 (8.2 × 10 −3 s −1 ) is higher than those over Al 2 O 3 (6.7 × 10 −3 s −1 ) and SiO 2 (2.8 × 10 −3 s −1 ), due to the discrepant Lewis acidity of various V−O−S sites. This research provides a fundamental insight into the intrinsic nature of V−O sites for non-oxidative propane dehydrogenation.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 71
·40804-40812
·
IF 2.936
Junhui Liu,Long Kong,Xueqiong Huang,Min Liu,Liang Li
In this study, magnetic sulfur-doped Fe3O4 nanoparticles (Fe3O4:S NPs) were applied as adsorbents for the removal of As(V). Fe3O4:S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe3O4:S NPs could effectively remove As(V) under a wide pH range of 2–10 and presented a high As(V) adsorption capacity of 58.38 mg g−1, which was much better than undoped Fe3O4 nanoparticles (20.24 mg g−1). Adsorption experiments exhibited a pseudo-second-order model of adsorption kinetics and a Langmuir isotherm model of adsorption isotherms. Additionally, the coexisting ions such as NO3−, SO42−, and CO32− had no significant effect on As(V) adsorption and the adsorbent worked well in actual smelting wastewater. XPS and FTIR spectra of Fe3O4:S NPs before and after As(V) adsorption showed that Fe–OH groups played a significant role in the adsorption mechanisms. Moreover, the magnetic Fe3O4:S NPs adsorbents after adsorption could be rapidly separated from wastewater with an external magnetic field. Therefore, Fe3O4:S NPs could be an ideal candidate for the removal of As(V) from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Longfei Xia,RiSheng Li,Menglin Yao,Xu Deng,Wen Sun,Miaomiao Du
In this study, micron Zero-valent Iron (mZVI), an affordable and well-dispersible reducing agent, was investigated for its potential application in removing Sb(V) from wastewater. Since Sb(V) primarily exists as Sb(OH) 6 - in aqueous solutions, the lower the pH, the more effective mZVI is in removing Sb(V). At a pH level of 3, mZVI (1.0 g/L) was able to remove more than 99 % of Sb(V) (20 mg/L) from the wastewater. The study also compared the influence of cations and anions on mZVI and found that anions had a greater impact on the material's performance. The paper further examined the impact of different heavy metal ions on mZVI and determined that the adsorption capacity of mZVI towards these ions follows the order of their reducing ability. Summarizing the removal mechanism of Sb(V) by mZVI, it was found that both adsorption and redox reactions played crucial roles and Sb(V) is ultimately removed from water through coprecipitation by combining with Fe-O on the mZVI surface. Theoretically, the maximum adsorption capacity of the mZVI material used in this study could reach 21.60 mg/g for Sb(V). This makes mZVI a promising environmental adsorption material and a potential solution for treating water pollution caused by antimony mining.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chunkai Huang,Zhiquan Xiang,Jincan Huang,Guangbing Liu,Xuemin Yu,Weijing Liu,Haijin Cao
Significant amounts of Sb(III) and Sb(V) are present in printing and dyeing wastewater (PDW), which leads to the detrimental effects on the environment if not treated properly. In this paper, the adsorptive removal of Sb(III) and Sb(V) by TiCl 4 derived flocs and the oxidation process were investigated. The results showed that TiCl 4 conducted superior coagulation performance on Sb(III) removal than Sb(V) in terms of dosage, pH range and immunity to interference. When the dosage was 50 mg/L and the final pH was 5.0, the concentration of Sb(III) and Sb(V) was reduced from 2000 μg/L to 100 μg/L and 180 μg/L, respectively. According to the Langmuir model, The adsorption for Sb(III) (74.27 mg/g) by TiCl 4 derived flocs was higher than Sb(V) (68.45 mg/g). The Sb(III) in the solution could partially inhibit the adsorption of Sb(V). It was also observed that the Sb(III) was oxidized to Sb(V), which was owing to the molecular oxygen during the coagulation and the flocs might act as catalyst. The actual printing and dyeing wastewater treatment experiments results showed that pre-reduction of Sb(V) to Sb(Ⅲ) could considerably improve the total Sb removal from 83 % to 98.8 %. The characterization results, such as zeta potential and x-ray photoelectron spectroscopy (XPS), indicated that the Sb(Ⅲ) removal was mainly achieved by chemisorption. The Sb(V) removal was mainly dependent on chemisorption and electrostatic adsorption, while the latter contributed more than former. The results of DFT calculations explained the reason for higher removal efficiencies of Sb(III) than Sb(V) in the TiCl 4 coagulation system. This study provides a new idea for the efficient removal of Sb(III) and Sb(V) using TiCl 4 in PDW to save the cost in engineering practice.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·6018
·
IF 4.2
Qianqian Dong,Qijun Zhong,Jie Zhou,Yuhao Li,Yujing Wang,Jiayang Cai,Shuangwei Yu,Xiong He,Shaohui Zhang
The oxygen evolution reaction (OER), which involves a four-electron transfer and slow kinetics, requires an efficient catalyst to overcome the high energy barrier for high-performance water electrolysis. In this paper, a novel Ni3S2@V-NiFe(III) LDH/NF catalyst was prepared via a facile two-step hydrothermal method. The constructed heterostructure of Ni3S2@V-NiFe(III) LDH increases the specific surface area and regulates the electronic structure. Furthermore, the introduction of the V element forms an electron transport chain of Ni-O-Fe-O-V-O-Ni, which optimizes the binding energy between metal active sites and oxygen evolution reaction intermediates, accelerates electron transfer, and improves self-reconstruction. With this dual regulation strategy, Ni3S2@V-NiFe(III) LDH/NF exhibits exceptional OER performance with an overpotential of 280 mV at 100 mA/cm2and a Tafel slope of 45.4 mV/dec. This work develops a dual regulation strategy combining heterostructure formation and the doping effect, which are beneficial in the design of efficient OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xuelu Wei,Laishi Li,Feng Liu,Limin Fan,Yusheng Wu
Ti 2 GaC is a novel ternary layered ceramic with unique physical and chemical properties such as excellent thermal conductivity , low density, high-temperature oxidation resistance , and corrosion resistance . However, the relatively low strength and hardness of Ti 2 GaC hinder its practical applications as a structural component. To strengthen the mechanical properties of Ti 2 GaC and extend its application range, in this study, (Ti 1-x V x ) 2 GaC MAX phase solid solutions with x ranging up to 0.25 were successfully synthesized using a two-step sintering method. (Ti 1-x V x ) 2 GaC solid solutions grains showed a typical lamellar structure , where the a lattice constant of (Ti 1-x V x ) 2 GaC decreased from 3.0660 to 3.0326 Å and c decreased from 13.3223 to 13.1520 Å. The effects of V content on the solid solution microstructure, crystal structure, mechanical strength, and resistance to friction and wear were evaluated in detail. In addition, the solid solution formation mechanism and fracture damage modes of these materials were discussed. The crystal structure, mechanical properties, electronic properties, and chemical bonding of (Ti 1-x V x ) 2 GaC continuous solid solution at x = 0–1 were calculated by DFT. The solid solution enhancement mechanism of (Ti 1-x V x ) 2 GaC was explained by analyzing the relationship between the structure and properties.
研究领域:
材料科学
·
机械工程
✓ 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）