ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 2
·1805227
·
IF 13.325
Gan Qu,Jun Wang,Guangyou Liu,Bingbing Tian,Chenliang Su,Zhesheng Chen,Jean-Pascal Rueff,Zhongchang Wang
Molybdenum trioxide (MoO 3 ) suffers from poor conductivity, a low rate capability, and unsatisfactory cycling stability in lithium-ion batteries. The aliovalent ion doping may present an effective way to improve the electrochemical performances of MoO 3 . Here, it is shown, by first-principle calculations, that doping MoO 3 with V by 12.5% can modulate significantly electronic structure and provide a small diffusion barrier for enhancing the electrochemical performance of MoO 3 . The ultralong Mo 0.88 V 0.12 O 2.94 nanostructures, which retain the h-MoO 3 structure and present an exceptionally high conductivity and fast ionic diffusion due to the substitution of V, facilitating lithiation/delithiation behavior, and induce a fine nanosized structure with a reduced volume change are prepared. As a result, the stress and strain are alleviated during the Li-ion intercalation/deintercalation processes, improving the cycling stability and rate capability. Such a large improvement in the electrochemical properties can be ascribed to the stabilizing effect of V, the small migration energy barrier, and short diffusion path, which arise from the introduction of V into MoO 3 . The unique engineering strategy and facile synthesis route open up a new avenue in modifying and developing other species of electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Zizheng Zhu,Kai Xu,Wen Guo,Hongyan Zhang,Xin Xiao,Maoshuai He,Tingting Yu,Hong Zhao,Dongen Zhang,Tao Yang
Co-based compounds have been considered as promising earth-abundant electrocatalysts for water splitting, however, the catalytic performance need to be further enhanced. Herein, we report a nickel foam (NF) supported Co-VOx-P nanoflower electrocatalyst that shows excellent catalytic performances, achieving a small overpotential of 230 mV at 100 mA/cm 2 for OER. Such performances surpass the recently reported best-performing Co-based catalysts in alkaline media. In addition, the present Co-VOx-P electrocatalyst can deliver 10 mA/cm 2 with a small overpotential of 98 mV for HER. Experimental and DFT studies indicate that, due to the combination of P and V, the Co-VOx-P electrocatalyst shows improved intrinsic catalytic properties including enhanced conductivity, facile electron transfer and favorable surface adsorption strength. The strategy demonstrated here by incorporating metalloid with high valence states may be extended to design other cost-efficient electrocatalysts for more advanced water splitting performances.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Xiao Li,Yuanjian Liu,Yudong Wu,Shanshan Li,Yinchen Dai,Jibiao Guan,Ming Zhang
Though transition metal phosphides (TMPs) have been applied as an efficient and cost-effective catalyst for hydrogen evolution reaction (HER), their large-scale application is still restrained by their lack of activity and durability. In this work, a novel vanadium doped nickel cobalt phosphide catalyst supported on carbon cloth (V-NiCoP/CC) is fabricated by a facile hydrothermal and phosphate method. Remarkably, V-NiCoP/CC only need the overpotential of 52 mV to drive 10 mA cm −2 in 1 M KOH solution, which is superior to many state-of-art transition monometallic phosphides electrocatalysts. Meanwhile, V-NiCoP/CC exhibits a low tafel slope of 51.2 mV dec -1 and superior stability in 2000 CV cycles and 40 h of long-term stability test. Furthermore, this work verifies that doping heteroatom provides new opportunities to enhance the HER performance of transition bimetallic phosphides with effect on their morphology and electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Xiuru Xu,Min Yin,Na Li,Wei Wang,Bolun Sun,Ming Liu,Dongwei Zhang,Zhenyu Li,Ce Wang
Vanadium (V)-doped tin oxide (SnO 2 ) one-dimensional porous nanofibers (PNFs) were fabricated for the hydrogen detection application. V-doping changes the distances of different facets of the SnO 2 crystal in different roles, and therefore deform or distort the SnO 2 structure. The modulation effects of V 4+ and V 5+ on hydrogen detecting performance were discussed. With a suitable amount of V-doping, the porous SnO 2 nanofibers exhibits ~66% increase of response sensitivity, 33% faster in response (2 s) and 50% faster in recovery time (1 s), comparing with undoped SnO 2 nanofibers.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shifan Zhu,Yicheng Tang,Yuqiao Wang
Delta manganese dioxide (δ-MnO 2 ) has emerged as a promising material for electrochemical energy storage due to its layered structure and high theoretical capacity. However, its practical application is hindered by poor rate performance and structural instability caused by low electronic conductivity and Jahn-Teller distortion. In this study, we demonstrate a vanadium-doped δ-MnO 2 composite anchored on exfoliated graphene (V-MnO 2 @EG) via a one-step electrodeposition method for planar micro-supercapacitors (PMSCs). Vanadium doping modulates the micromorphology of δ-MnO 2 from nanoflower to a coral-like architecture, enhancing specific surface area (125.84 m 2 g −1 vs. 95.86 m 2 g −1 for pristine MnO 2 @EG) and electrolyte diffusion kinetics. Density functional theory (DFT) calculations reveal that V-doping introduces oxygen vacancies, suppresses Jahn-Teller distortion, and improves electronic conductivity and Li + adsorption energy. The V-MnO 2 @EG electrode delivers a remarkable areal capacitance of 441.2 mF cm −2 at 1 mA cm −2 and retains 97.67 % capacitance after 100,000 cycles. Ex-situ characterizations confirm reversible Li + intercalation/deintercalation as the charge storage mechanism. This work provides a rational strategy for designing high-performance manganese oxide-based micro-energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Yihan Feng,Zichuang Li,Shanlin Li,Minghui Yang,Ruguang Ma,Jiacheng Wang
Integrating active Pt clusters into transition-metal oxides with water-dissociation ability is effective to prepare a bifunctional electrocatalyst for water splitting in alkaline. However, the additional utilization of a reductant and/or the operation at the elevating temperature causes the over-growth and agglomeration of Pt clusters, thus losing the high catalytic performance. Herein, we report that V dopant not only favors self-reducing Pt clusters on NiFe layered double hydroxide (LDH) (Pt/NiFeV) at room temperature, but also regulates interfacial charge redistribution to enhance the water-splitting performance. Experimental and theoretical studies reveal that V dopant into NiFe LDH triggers more electrons to transfer to adjacent Fe atoms, thus leading to a higher reducing ability compared to that without V-doping. When used as water-splitting electrocatalyst, V doping promotes electron loss of Pt clusters in Pt/NiFeV, optimizing the free energy of hydrogen adsorption and proton recombination kinetics at the cathode. Meanwhile, it also moves the d-band center of Ni away from the Fermi level to optimize the adsorption of *OH intermediates and facilitate the desorption of oxygen molecules at the anode. Thereby, Pt/NiFeV exhibits much higher bifunctional performance than V-free Pt/NiFe LDH toward both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). This work can spark inspiration of designing other bifunctional electrocatalysts for energy conversion and storage.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yan Lu,Weilin Weng,Yuanhang Lu,Xinxin Pang,Naixuan Hu,Banghua Peng
Hydrogen is increasingly recognized as a critical energy source for the future. Transition metal nitrides hydrogen catalysts have found to narrow the d-band contraction effectively and alter the filling state of the metal, thereby modulating the metal-hydrogen bonding energy and enhancing both electrical conductivity and catalytic activity. In this study, V-doped cobalt nitrides (V–Co 2 N/CoN) with two distinct crystalline structures were successfully synthesized through the nitriding of V-doped cobalt bicarbonate (V–CoCH) as a precursor. The morphology and structure of the resulting materials were carefully optimized by adjusting the V doping amount and nitriding temperature. For hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), the final product V–Co 2 N/CoN-1-400 only needs 47 mV and 230 mV overpotential to reach 10 mA cm −2 , and works at 1.69 V to drive the overall water splitting for 10 mA cm −2 , showing good stability performance without fluctuation for about 10 h. This work implies that V-doped cobalt nitrides can lead to enhanced water splitting catalytic activity. Our findings may illustrate the significance of V doping for improving electrocatalytic performance, and demonstrate the potential of CoV bimetallic nitrides as effective electrocatalysts , offering valuable insights for the further development of non-precious metal nitride-based catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xiangheng Du,Yini Fang,Jibiao Guan,Shanshan Li,Lina Wang,Ming Zhang
For the sake of sustainable development, water splitting without other pollutants has been a candidate technology in green energy. Due to the low efficiency of water splitting, innovative breakthroughs are desirable to improve efficiency significantly. Nowadays, the rational design of non-precious metal-based robust bifunctional catalysts is considered to be a feasible way to promote both the cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER). Herein, we proposed a vanadium doped CoP nanorods array catalyst grown on carbon cloth (V–CoP NRs/CC) as a bifunctional electrode material . When V–CoP NRs/CC employed as both anode and cathode materials, it only demands low cell voltages of 1.491 V and 1.606 V to drive a current density of 10 mA cm −2 ( j 10 ) and 50 mA cm −2 ( j 50 ) in 1 M KOH alkaline electrolyte . Especially, V–CoP NRs/CC can maintain its outstanding electrocatalytic performance for more than 40 h at j 50 in overall water splitting.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qingxue Liu,Yuefeng Song,Rongtan Li,Houfu Lv,Weicheng Feng,Yuxiang Shen,Xiaomin Zhang,Guoxiong Wang,Xinhe Bao
CO 2 electrolysis through solid oxide electrolysis cells (SOECs) is a promising strategy for converting CO 2 to useful fuels and chemicals powered by renewable energy. Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) is a widely-investigated anode material of SOEC on account of its high and catalytic activity . However, its poor stability under CO 2 atmosphere limits its application as cathode in CO 2 electrolysis. Herein, we develop a vanadium-doped BSCF material Ba 0.5 Sr 0.5 (Co 0.8 Fe 0.2 ) 1-x V x O 3-δ (BSCFV x ) for SOEC cathode. The doping of V into B site of BSCF decreases the basicity of perovskite oxide and increases its stability under CO 2 atmosphere, thus improving the CO 2 electrolysis performance. Compared to BSCF, the cell of BSCFV 0.01 cathode shows a better tolerance to CO 2 and achieves 48.3% increase in current density at 1.6 V and 800 °C.
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
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Qian Zhou,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A new strategy was reported for removal of low-concentration BPA in water via piezocatalytic degradation of equivalently V-doped SrTiO 3 nanofibers (V-STO NFs), which can effectively convert mechanical vibration into chemical energy under ultrasound only. The optimal doped 0.5% V-STO NFs exhibited excellent piezocatalytic performance of complete removal of BPA within 24 min, which could be ascribed to the localized surface piezoelectricity of SrTiO 3 itself and increased local asymmetry of the crystal originating from equivalent vanadium substitution. The influence of ultrasonic power, pH, BPA concentration and coexisting inorganic anions on BPA degradation were analyzed. Moreover, a suitable piezocatalytic mechanism was proposed through the free radical capture test and ESR characterization. The results suggested that the •O 2 – and •OH are the main active radicals in BPA oxidation. It provides a feasible approach for removal of phenolic pollutants by a perovskite-based nano-piezoelectric material.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Can Liu,Lei Zhang,Guoqiang Yu,Tao Wang,Xiaoping Wu,Lingbo Xu,Ping Lin,Can Cui,Xuegong Yu,Peng Wang
Near stoichiometric molybdenum oxide (MoO 3-x ) film has attracted extensive interest as superior hole-selecting material in optoelectronic devices. However, the existence of multi-oxidation states significantly affects its work function and carrier transport behaviors. In this work, we have proposed a facile way to modulate the oxidation states of solution-processed MoO 3-x with vanadium ions (V 5+ ) doping (MoO 3-x :V), beneficial for improved hole-selecting contact performance with silicon . As the doping concentration of V 5+ increases, oxygen vacancies and reduced Mo 5+ ions reduce, resulting in the increase of work function of MoO 3-x film. The effective carrier lifetime of MoO 3-x deposited Czochralski silicon has been largely improved from 60.1 to 153.0 μs (Δn = 10 15 cm −3 ) at the optimized doping concentration of 5%, and the contact resistivity is reduced from 9.1 to 2.1 Ω cm 2 simultaneously. The finished solar cells with the scheme of Ag/MoO 3-x :V/n-Si have exhibited significantly improved conversion efficiency. Our results have demonstrated a very promising way to modulate the stoichiometry and work function of MoO 3-x film, which has great potential in solar cell and light emitting diode applications.
研究领域:
材料科学
·
光电子学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Liang-ai Huang,Yue Xu,Yilin Song,Haijiao Xie,Wenwu Zhong
Local electronic structure engineering is an effective approach for optimizing the catalytic performance of electrocatalysts. Herein, a dual-phase vanadium-doped nickel phosphide (NiV x P) catalyst supported on nickel foam (NF) was synthesized via a successive hydrothermal and phosphorization process with interconnected nanosheet structures and homogeneous distributions. The catalyst's stable phase and strong adhesion to the substrate ensure good electrochemical stability. The incorporation of V effectively promotes initial H 2 O adsorption and H* formation, leading to a lower overpotential. As a result, the fabricated NiV x P@NF demonstrates favorable hydrogen evolution reaction (HER) activity and stability, with only 85 mV overpotential needed to reach 10 mA·cm −2 and showing no significant increase in the overpotential during the long-term 78-hour stability test.
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
危险品化学品经营许可证（带存储）