ENVIRONMENTAL RESEARCH
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2019
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IF 5.026
Tao Wang,Xiqing Liu,Donglai Han,Changchang Ma,Maobin Wei,Pengwei Huo,Yongsheng Yan
This work focused on the utilization of biological extract for the preparation of lignin-based carbon composites materials and used in the field of photocatalysis . A straightforward one-step carbonization way has been developed to prepare vanadium-doped lignin-based carbon/Bi 2 O 3 composites photocatalyst by using sodium lignosulfonate as the carbon source and catalyst. The application of lignin as the carbon source to form photocatalyst support tends to control the uniform distribution. At the same time, sodium lignosulfonate as the catalyst could break down the BiVO 4 during carbonization process. A series of characterizations demonstrated the BiVO 4 was transformed into Bi 2 O 3 and vanadium-doped lignin-based carbon. The possible synthesis process was proposed. Moreover, the novel V-doped carbon/Bi 2 O 3 composites photocatalyst displayed higher photocatalytic activity than bare BiVO 4 . A possible photocatalytic mechanism was also discussed. This work provided new insight into the lignin-based carbon materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
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2019
·
IF 5.162
Jun-Feng Qin,Jia-Hui Lin,Tian-Shu Chen,Da-Peng Liu,Jing-Yi Xie,Bao-Yu Guo,Lei Wang,Yong-Ming Chai,Bin Dong
Adjusting the intrinsic activity and conductivity of electrocatalysts may be a crucial way for excellent performance for water splitting. Herein, the rational design of vanadium element doped cobalt phosphide (V-doped CoP) nanoparticles has been investigated through a facile gaseous phosphorization using cobalt vanadium oxide or hydroxide (Co-V hydr(oxy)oxide) as precursor. The physical characterization shows that the homogeneous dispersion of V element on V-doped CoP nanoparticles have obtained, which may imply the enhanced electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The electrochemical measurements of the prepared V-doped CoP in alkaline electrolyte demonstrate the superior electrocatalytic activity for both HER (overpotential of 235 mV@10 mA cm −2 ) and OER (overpotential of 340 mV @10 mA cm −2 ). Further, V-doped CoP nanoparticles used as anode and cathode simultaneously in a cell require only 370 mV to achieve a current density of 10 mA cm −2 . The outstanding electrocatalytic activity may be ascribed to the improved conductivity and intrinsic activity owing to phosphating and the doping of V element. In addition, the long-term stability of V-doped CoP has been obtained. Therefore, metal doping into transition metal-based phosphides may be a promising strategy for the remarkable bifunctional electrocatalyst for water splitting.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Peiwen Liu,Yannan Zhang,Peng Dong,Yingjie Zhang,Qi Meng,Siyuan Zhou,Xuan Yang,Mingyu Zhang,Xi Yang
Direct regeneration has been widely applied in recovery of LiFePO 4 batteries. However, excess residual carbon and inherent low electronic and ionic conductivity of spent LiFePO 4 /C cathode materials lead to the reduction of electrochemical performance. Herein, a facile and simple regeneration process of pre-oxidation and vanadium doping is developed to regenerate LiFePO 4 /C cathode materials . Pre-oxidation was applied to remove excess carbon at 500 °C for 3 h in air. Vanadium doping was applied to improve electronic and ionic conductivity of regenerated cathode materials. Among the regenerated cathode materials, the 3 mol% V doped sample possesses discharge capacity of 134.3 mAh/g after 200 cycle at 1C with the discharge capacity retention of 99.1%. At 2, 5, 10C, the discharge capacities are 134, 124.1, 111.5 mAh/g, respectively. The vanadium doping regeneration process with oxidation pre-oxidation is simple, and feasible to be applied in the recovery of spent LiFePO 4 cathode materials.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Danyang He,Liyun Cao,Yixuan Huang,Guodong Li,Yongqiang Feng,Yajuan Zhao,Xiaoyi Li,Dongming Li,Liangliang Feng
Tailoring the nonprecious nickel selenide heterogeneous electrocatalysts with controllable morphology and electronic structures is of prime importance to enhance the catalytic efficiency for hydrogen production evolution (HER). Here, we report the solvothermal in-situ synthesis of vanadium-incorporated NiSe/Ni 3 Se 2 heterogeneous structures (VNS) on porous nickel foam, which function as an efficient electrode toward HER, together with superior catalytic activity and durability. Impressively, the self-assembled VNS electrode delivers the current densities of 100, 500 and 1000 mA cm −2 at quite low overpotentials of 175, 275 and 348 mV with 85% iR -compensation toward HER in 1.0 M KOH solution. Mott-Schottky analysis indicates that the vanadium doping alters the flat band potential of VNS, and in turn affects the electrons migration behavior at electrode and electrolyte interface. Benefiting from its dramatically increased catalytic active sites exposure, enhanced charge transport capability, and optimized electronic structure, the hierarchical VNS heterostructures exhibit an impressive HER electrocatalytic performance in alkaline media. More broadly, this research provides a promising strategy for design and exploitation of more advanced electrocatalysts for large-scale hydrogen production on selenides using heteroatom vanadium incorporation.
研究领域:
材料科学
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电化学
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可再生能源
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wen-Juan Xu,Sami Ur Rahman,Ying-Yu Wang,Jiang-Yan Dang,Xiao-Ying Zhang,Wen-Liang Li,Jing-ping Zhang
Seawater electrolysis offers a dual benefit of alleviating freshwater scarcity and advancing hydrogen energy technologies. However, its practical implementation is hindered by the complex chemical composition of seawater, particularly the corrosive chloride ions that induce electrode degradation and parasitic chlorine evolution, posing critical challenges to long-term electrolytic stability. To address this issue, we designed an efficient electrocatalyst by introducing vanadium (V) doping and oxygen vacancies (Ov) into nanoflower-structured Co 3 O 4 ( V-Co 3 O 4 (Ov)-250 ) through hydrothermal synthesis and controlled annealing. The Ov configuration modulates electronic structures and facilitates charge transfer, whereas V doping enhances corrosion resistance, increases lattice defects, and generates active sites. This dual modification synergistically improves surface reactivity and conductivity, boosting catalytic performance. V-Co 3 O 4 (Ov)-250 achieves low overpotentials of 69 mV for the hydrogen evolution reaction (HER) and 158 mV for the oxygen evolution reaction (OER) in alkaline freshwater, and 133 mV (HER) and 228 mV (OER) in alkaline seawater at a current density of 10 mA cm −2 . When assembled into an electrolytic cell, the catalyst requires a low voltage of 1.68 V to drive a current density of 100 mA cm −2 in an alkaline seawater electrolyzer, while maintaining outstanding stability over 100 h of continuous operation. This performance surpasses that of most non-precious metal-based electrocatalysts for seawater electrolysis. Theoretical analysis elucidates that V doping promotes preferential adsorption of OH – at the active site and optimizes intermediates’ adsorption–desorption equilibrium through its synergy with Ov, consequently lowering the reaction energy barrier and enhancing intrinsic catalytic activity.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Peng Zhou,Xingshuai Lv,Danning Xing,Fahao Ma,Yuanyuan Liu,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Baibiao Huang
Ni 0.2 Mo 0.8 N is regarded as an ideal water splitting electrode due to its high electronic conductivity, bimetallic characteristic and earth abundance property. However, it is very likely to further improve the electrochemical performance since the adsorption behavior of the Ni 0.2 Mo 0.8 N on catalytic intermediates has not reached a satisfactory level. Herein, we designed and developed a novel V doped hexagonal Ni 0.2 Mo 0.8 N electrode (denoted as V-Ni 0.2 Mo 0.8 N) which exhibits superior water splitting performances (39 mV at 10 mA cm −2 and 245 mV at 25 mA cm −2 for HER and OER respectively). Combined with the density function theory calculations, the improvement of the water splitting performance is attributed to the optimized water adsorption energy, water dissociation energy barrier, active hydrogen adsorption free energy , oxygen-containing intermediates adsorption free energies and increased electronic states density near the Fermi level. Finally, the assembled water splitting system exhibits low overpotential (1.52 V at 10 mA cm −2 ) and excellent durability.
研究领域:
材料科学
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电化学
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理论计算
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DOI
高影响因子
Small Methods
·
2019
·Vol. 3
·期 11
·1900356
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IF 0
Tongwei Wu,Wenhan Kong,Ya Zhang,Zhe Xing,Jinxiu Zhao,Ting Wang,Xifeng Shi,Yonglan Luo,Xuping Sun
As a sustainable alternative technology to the Haber–Bosch process, electrochemical N 2 reduction offers the hope of directly converting N 2 to NH 3 at ambient conditions. However, its efficiency greatly depends on screening high-active electrocatalysts for the N 2 reduction reaction (NRR). Here, the recent experimental finding that V is an effective dopant to greatly improve the NRR performances of TiO 2 toward ambient N 2 -to-NH 3 fixation with excellent selectivity is reported. In 0.5 m anhydrous lithium perchlorate, V-doped TiO 2 nanorods attain a high Faradic efficiency of 15.3% and a large NH 3 yield of 17.73 µg h −1 mg cat. −1 at −0.40 and −0.50 V versus reversible hydrogen electrode, respectively, rivaling the performances of most reported aqueous-based NRR electrocatalysts. Density function theory (DFT) calculations are performed to gain further insight into the catalytic mechanism.
研究领域:
材料科学
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化学工程
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理论计算
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DOI
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Xuefei Wu,Junxiang Chen,Zhenhai Wen
To explore highly active non-noble electrocatalysts toward full water splitting, the incorporation of other metal elements to the host electrocatalyst is required, especially for previously reported highly efficient MoO2–MoNi4 (MoNi in short). Herein, to lessen the energy cost in full water splitting, the vanadium-incorporated MoO2–MoNi4 (VMoNi in short) hybrid nanoarray self-supported on nickel foam is prepared through a simple way. Compared with the Mo–Ni binary electrocatalyst, vanadium incorporation can obviously boost oxygen evolution reaction (OER) activity while almost keeping the perfect hydrogen evolution reaction (HER) ability, for it merely requires 202 and 17 mV for 10 mA cm–2 working current density toward OER and HER, respectively. Furthermore, it displays outstanding performance toward full water splitting, merely requiring 1.45 V for 10 mA cm–2 and 1.61 V for 100 mA cm–2 in water electrolysis with keeping the voltage stable in tens of hours at 250 mA cm–2. This work highlights the significance in large-scale hydrogen production from water electrolysis with the help of exploring non-noble materials, an important milestone in converting the renewable energy to hydrogen energy.
研究领域:
材料科学
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能源转换
·
电化学
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产品关联
DOI
高影响因子
ChemSusChem
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2022
·Vol. 16
·期 7
·e202201892
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IF 9.14
Zemian Ma,Xueying Ma,Wei Luo,Yimin Jiang,Wei Shen,Rongxing He,Ming Li
Graphical Losing it : A catalyst surface self-etching strategy is suggested to construct the high-performance V−CoCH catalyst for the overall water splitting. With the easy and partial dissolution of V species in the early stages of the oxygen evolution reaction, a large number of active sites and oxygen vacancies are generated, and the electrochemical activity is improved significantly. Herein, vanadium-doped cobalt carbonate hydroxide, V−CoCH, was synthesized as efficient catalyst for water splitting. Vanadium species were partially dissolved in the early stages of the oxygen-evolution reaction (OER), inducing self-etching of the catalyst surface, which is helpful for catalyst surface reconstruction and resulted in a higher number of active sites and oxygen vacancies. The synergy between V-doping and oxygen vacancies improved the catalytic activity: V−CoCH showed an exceptional OER catalytic performance with an overpotential of 183 mV at 10 mA cm −2 . The water-splitting cell consisting of V−CoCH only required 1.52 V to reach 10 mA cm −2 . Theoretical calculations revealed that vanadium in V−CoCH played an important role in electron regulation of active sites. The oxygen vacancies had an important effect on improvement of the OER performance through not only the exposure of more active sites but also through modulation of the electronic structure. This work provides an effective strategy for constructing high-performance electrocatalysts.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yingjie Cheng,Li He,Dong Mao,Xuejian Shi,Chunzhong Wang,Fengxue Duan,Pengyan Xue,Yizhan Wang,Yingjin Wei
The active electronic states in 1T-MoS 2 are highly desirable for catalyzing polysulfides conversion. However, stable 1T-MoS 2 is difficult to produce using common approaches. Herein, V uniformly doped in-plane 1T-2H heterostructured MoS 2 nanosheets (V-MoS 2 ) are prepared by a facile hydrothermal method with a polyoxometalate precursor containing periodic Mo and V atomic arrangement. The doping of V induces the phase transition from semiconducting 2H-MoS 2 to metallic 1T-MoS 2 and stabilizes the resulted 1T phase. Importantly, the incorporation of V not only modifies the surface electronic property of MoS 2 , enhancing the active site density, but also improves the adsorption of polysulfides and the catalytic efficiency for sulfur redox reactions. With these advantages, the Li-S batteries using V-MoS 2 electrocatalyst achieve accelerated reaction kinetics and superior electrochemical performance. When the S loading of the cathode is 5.41 mg cm −2 , a favorable discharge capacity of 4.98 mAh cm −2 is obtained with satisfying cycle stability. This work provides an efficient atomic engineering approach for the design of high performance electrocatalyst for Li-S batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Small
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2024
·
IF 13
Yixuan Li,Jiahui Jiang,Qihao Wu,Yuying Feng,Zhongxu Chen,Guancheng Xu,Li Zhang
The development of energy- and time-saving synthetic methods to prepare bifunctional and high stability catalysts are vital for overall water splitting. Here, V-doped nickel-iron hydroxide precursor by etching NiFe foam (NFF) at room temperature with dual chloride solution (“NaCl-VCl3”), is obtained then phosphating to obtain V-Ni 2 P-FeP/NFF as efficient bifunctional (oxygen/hydrogen exchange reaction, OER/HER) electrocatalysts, denoted as NFF(V, Na)-P. The NFF(V, Na)-P requires only 185 and 117 mV overpotentials to reach 10 mA cm −2 for OER and HER. When used as a catalyst for water splitting in a full cell, it can be stably sustained for more than 1000 h in alkaline brine electrolysis at both current densities of 100 and 500 mA cm −2 . In situ Raman analyses and density functional theory (DFT) show that the V-doping-induced surface remodeling generates hydroxyl oxides as the true catalytic active centers, which not only enhances the reaction kinetics, but also reduces the free energy change in the rate-determining step. This work provides a cost-effective substrate self-derivation method to convert commercial NFF into a powerful catalyst for electrolytic brine, offering a unique route to the development of efficient electrocatalysts for saline water splitting.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 4
·1120-1129
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IF 2.936
Wang Hongkang,Chai Shanshan,Li Panpan,Yang Yijun,Wang Xi
Propane dehydrogenation to propylene, one of the most significant compounds in the chemical industry, has attracted tremendous attention worldwide. A series of V doped graphitic carbon nitride composites (V-g-C 3 N 4 ) were synthesized via a combination of thermal polymerization of urea and thermal decomposition of NH 4 VO 3 . After doping VO x species, the V doped g-C 3 N 4 catalysts achieved an optimal propylene yield of 16.16% with a propylene selectivity of 68.6% at 600 °C, compared with undoped g-C 3 N 4 (a propylene yield of 5.42% with a propylene selectivity of 53.9%) at the same condition. Subsequently, various characterization techniques, including XRD, TEM, FTIR, Raman, XPS, N 2 adsorption–desorption, etc., were unitized to investigate the chemical properties and crystalline structures of the prepared catalysts. The essence of catalytic enhancement, such as crystallinity, the main active VO x species, and the newly emerging V–N bonds in V-g-C 3 N 4 catalysts, has been discussed, providing a tentative reaction pathway for CH 3 (*CH)CH 3 and CH 3 CHCH 2 * species on V active sites. In general, this work offers a research basis for the bran-new materials design for propane dehydrogenation. Graphical Abstract
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）