JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Hongyan Zhang,Xuehan Yang,Hua Wang,Yikai Wang,Ranran Li,Heye Fu,Hao Zhou,Dan Wu,Pan Yuang,Maoshuai He,Wenxian Wei,Tao Yang
Hydrogen has long been widely recognized as a promising carbon-free fuel with potential to tackle energy and environmental challenges owing to its high energy density and cleanliness. Water electrolysis offers an environmentally friendly method for hydrogen production from water and largely depends on the efficiency of electrocatalysts. Molybdenum diselenide (MoSe 2 ) has been regarded as one of the most promising earth-abundant and cost-effective catalysts for hydrogen evolution reaction (HER). Nevertheless, its catalytic activity has thus far remained below expectations. In this research, we introduce a vanadium-modulated Ni-MoSe 2 catalyst (NiV-MoSe 2 ), demonstrating outstanding catalytic performance towards HER with an overpotential of 74.5 mV at 10 mA cm −2 and a Tafel slope of 56.2 mV dec −1 . The enhancement of catalytic performance is highly likely attributed to the dual doping of vanadium and nickel. As a result, the intrinsic activity, electrochemical active surface area, and conductivity are significantly improved. These findings enable the NiV-MoSe 2 catalyst to be an exceptionally competitive alternative to noble metal-based catalysts, and may stimulate further studies in designing efficient HER catalysts through multi-heteroatom substitution.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Rui Feng,Zhou Fang,Runxi Zhang,Xiaoyan Hu,Tianbo Li,Wei Zhou,Feifei Yang,Xinlong Yan,Shijian Lu
Direct hydroxylation of benzene to phenol is a more environmentally friendly way to generate phenol compared with the traditional method. This study developed vanadium-modified hollow-structured titanium silicate-1 (TS-1) as a catalyst for the effective hydroxylation of benzene to phenol under moderate conditions using hydrogen peroxide as an oxidant. The synthesis of TS-1 zeolites has been improved using traditional hydrothermal, crystal seed, and dissolution–recrystallization techniques. Compared with conventional TS-1, hollow-structured TS-1 exhibited a higher mesopore volume and surface area. Later, vanadium doping increased the charge density associated with the framework Ti centers and acid site content. In the radical reaction process, the adsorption and activation of benzene on highly reactive Ti–OOH intermediates, as well as the improvement of performances toward benzene hydroxylation to phenol, were facilitated by the increase in the concentration of open active centers and acid and electron characteristics.
研究领域:
催化化学
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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
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Danyang He,Liyun Cao,Jianfeng Huang,Yongqiang Feng,Guodong Li,Dan Yang,Qingqing Huang,Liangliang Feng
Developing highly efficient and cost-effective non-noble metal electrocatalysts with prominent operational stability toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is indispensable for large-scale water electrolysis but remains challenging. Here, an innovative superhydrophilic vanadium-modulated Ni3Se2 nanorod@nanosheet array in situ grown on nickel foam (V-Ni3Se2/NF) is synthesized via a solvothermal strategy employing a NiV-LDH nanosheet as a precursor. Experimental investigations disclose that the hierarchical nanostructure endows V-Ni3Se2/NF with abundant electrochemically surface active sites that render the easy accessibility of the electrolyte to the electrode, thereby enhancing the electron transfer efficiency and electrocatalytic activity toward HER and OER. Furthermore, the modulated electronic configuration in V-Ni3Se2/NF not only favors the water dissociation and formation of adsorbed hydrogen but also optimizes the binding energy of key reaction intermediates, thus expediting the water electrolysis kinetics. Consequently, the V-Ni3Se2/NF electrode requires ultralow overpotentials of 275 and 370 mV at a large current density of 500 mA cm–2 in 1.0 M KOH solution toward HER and OER, respectively. The assembled V-Ni3Se2/NF||V-Ni3Se2/NF electrolyzer yields a low cell voltage equaling to 1.56 V to deliver 10 mA cm–2 together with an extraordinary long-term durability for 80 h, far outperforming the benchmark Pt/C/NF||IrO2/NF counterpart (1.76 V, 10 mA cm–2), demonstrating its glorious potentials in large-scale industrial water electrolysis applications. This work puts forward novel synergistic tactics to construct bifunctional electrocatalysts with prominent water splitting performance in a harsh alkaline electrolyte.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Tingting Zhou,Hailin Zhang,Junyou Shi
Lignin, as the largest renewable aromatic resource, has significant opportunities for producing high-value products via catalytic depolymerization. However, its complex structure and stable chemical bonds present challenges to its transformation. This study explores the catalytic depolymerization of lignin to aromatic monomers by means of Dawson-type phosphomolybdovanadate polyoxometalates (POMs), understanding the underlying mechanisms. Furthermore, vanadium modification is employed to adjust the catalyst's oxidative and acidic properties, demonstrating that the vanadium content in Dawson-type POMs greatly influences monomer yield. The highest yield is achieved with H 8 P 2 Mo 16 V 2 O 62 (V2). Optimal conditions include a reaction temperature of 150 °C, 4 h, an oxygen pressure of 1 MPa, a methanol-to-water ratio of 8:2, and a mass ratio of the catalyst to the wood powder being 1:1, which leads to a total yield of aromatic monomers at 24 %. POMs with high REDOX potential selectively oxidizes benzyl hydroxyl groups in lignin to benzyl carbonyl groups under the combined action of acidity and oxidation of polyacids. This weakens the β O 4 bond and promotes C O bond cleavage. This approach, utilizing the tunable oxidative acidity of polyoxometalates to degrade lignin and produce various aromatic monomers, shows promising potential for lignin valorization and advancing a bio-economy based on lignocellulosic resources.
研究领域:
化学工程
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可再生资源利用
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Rui Feng,Zhou Fang,Wei Wang,Tianbo Li,Xiaoyan Hu,Xinlong Yan,Zhongdong Zhang
Direct hydroxylation of benzene to phenol is an environmentally friendly strategy to produce phenol compared with the conventional process. In this work, vanadium-modified titanium silicate-1 (TS-1) with enhanced Lewis acid and charge density were prepared as catalysts for efficient hydroxylation of benzene to phenol in the presence of hydrogen peroxide as an oxidant under mild conditions. The hierarchical TS-1 zeolites with a high framework Ti content were synthesized in the presence of NH4HCO3, and then vanadium doping was used to change the acidity and charge density. It was found that NH4HCO3 favored the titanium substitution of framework sites and nanocrystal stacking of TS-1. Vanadium doping increased the amount of Lewis acid sites and the charge density associated with the framework Ti. The enhancement in acid and electron characteristics boosted the intrinsic catalytic reactivity of Ti-OOH species, which further improved the performances toward benzene hydroxylation. The presented strategy and mechanistic results clarified the relationship between the structure and acidity in TS-1 zeolite. It was also verified that hydroxyl radicals (•OH) rather than superoxide radicals (•O2–) were the reactive agents responsible for the consecutive selective oxidation of benzene.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wenwei Feng,Hui Lin,Andac Armutlulu,Jie Chen,Rui Liu,Ruzhen Xie,Bo Lai
A novel eco-friendly vanadium-mediated Magnéli phase titanium suboxide (V@Ti 4 O 7 ) was fabricated via ball-milling-vacuum sintering method. The presence of V improved the stability and electrochemical performance of Ti 4 O 7 , which significantly promoted the activation of persulfate (PS) for superior degradation of organic pollutant ciprofloxacin (CIP). The results show that V doping significantly facilitated the electron transfer process and enhanced the oxygen evolution potential. The redox cycle of V 3+ /V 4+ and V 4+ /V 5+ endows the electrode with high stability and enriched catalytic active sites for PS activation , which allows for 89.11% CIP removal after the 8 th reuse. Scavenging experiments and electron paramagnetic resonance (EPR) results revealed the contribution of reactive oxidant species (i.e., SO 4 − , OH and 1 O 2 ) for efficient CIP degradation in the E-V@Ti 4 O 7 -PS system, in which, OH was the dominant reactive species accounting for 53.09 % of CIP removal, resulting in efficient CIP mineralization (TOC > 86.51%). The results of this study provide a better understanding of the relationship between the nature of anode and electro-activation of PS, which can facilitate the electrode design and optimization of E-PS reactors.
研究领域:
环境科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
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