JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ling-Xin Kong,Yi Fang,Meng-Meng Wang,Hui-Hao Li,Shan Huang,Ji-Sen Li,Qi Xiao
Industrial-scale hydrogen energy deployment requires the design of highly efficient catalysts with low overpotential and excellent stability, particularly at high current densities. We report a novel method for fabricating an N-doped carbon coated self-supporting Ni-NiWO 4 heterojunction on a nickel foam (NF) catalyst (Ni-NiWO 4 @NC/NF) using a facile combination of hydrothermal and chemical vapor deposition techniques. The Ni-NiWO 4 @NC's plentiful catalytic active sites and their seamless contact with NF, along with the synergistic coupling of N-doped carbon, contribute to a decrease in charge transfer resistance and an improvement in catalyst stability. Impressively, when evaluated as an electrocatalyst in alkaline media, the overpotentials of Ni-NiWO 4 @NC/NF at a current density of 100 mA·cm −2 are only 125.6 mV for hydrogen evolution reaction (HER), and 308.8 mV for oxygen evolution reaction (OER), respectively. The catalyst also demonstrates exceptional stability for HER, OER, and water splitting at high current densities. In addition, the two-electrode electrolyzer using Ni-NiWO 4 @NC/NF as both cathode and anode need a cell voltage of 1.72 V to deliver 100 mA·cm −2 . These findings offer valuable insights into the design and advancement of self-supported non-noble transition metal electrocatalysts for large-scale hydrogen production in industrial applications.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12808-12818
·
IF 4
Yanan Li,Jiqi Zheng,Jiaze Yan,Yanyan Liu,Ming Guo,Yifu Zhang,Changgong Meng
Diphenylamine (DPA) is a harmful pesticide widely used to control post-harvest scald of fruits. In this study, rapid and sensitive determination of DPA was realized by the development of an effective electrochemical sensor, which was fabricated by coupling La-doped NiWO4 nanoparticles (La/NiWO4) with reduced graphene oxide (rGO), and the obtained rGO/La/NiWO4 nanocomposite was modified on glassy carbon electrodes (GCEs). The morphologies, structures and compositions were well characterized, and the effects of La doping and the introduction of rGO on the crystal structure and electrochemical performance were discussed. The incorporation of both La and rGO was found to enhance the active surface area and improve conductivity, resulting in the enhanced electrocatalytic performance of rGO/La/NiWO4/GCE, including a wide linear range (0.01–500 μM), a low detection limit (0.0058 μM) and high sensitivity (1.778 μA μM−1 cm−2). The fabricated sensor was further used for DPA detection in fresh apple extract to evaluate its practicality and demonstrated excellent recoveries ranging from 99.52 to 104.70%.
研究领域:
分析化学
·
环境科学
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Guojuan Hai,Jianfeng Huang,Liyun Cao,Koji Kajiyoshi,Long Wang,Liangliang Feng
Designing and synthesizing heterojunction electrocatalyst with abundant active sites is critical to optimize the activity of electrochemical water splitting. Herein, a typical hierarchical W 18 O 49 /NiWO 4 heterojunction grown on nickel foam was successfully synthesized via a multistep synthesis strategy. The electrochemical oxidation and reduction process triggers the amorphization of W 18 O 49 and significantly enhances the interfacial interaction, thereby endowing the composites with enriched active sites. The W 18 O 49 /NiWO 4 /NF is completely reconstructed to NiWO 4 /NF and NiWO 4 /NiOOH/NF with amorphous-crystalline interface (denoted as H-AM/NiWO 4 /NF for HER and O-AM/NiWO 4 /NiOOH/NF for OER). The valence of tungsten ions is well modulated to achieve a high proportion of tetravalent W (IV) active sites accompanied by abundant oxygen vacancies. The increased Ni (III) ions as OER active sites have strong orbital overlap with reaction intermediate, which stabilize the low-valent W (IV) by producing more NiOOH species during the oxygen evolution reaction. Benefiting from the amorphous–crystalline composites, unsaturated W (IV) sites, abundant oxygen vacancies, and highly active NiOOH species, the activated electrocatalyst exhibits excellent electrocatalytic activity, achieving a small overpotential of 1.53 V at 10 mA·cm −2 for water-splitting and maintaining long-term stability at least 100 h.
研究领域:
材料科学
·
电化学
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 8
·1804
·
IF 4.6
Wentao Xiang,Zhenzhen Yu,Renwu Gao,Zhichao Yi,Kun Gong,Kangqiang Lu,Weiya Huang,Changlin Yu,Zeshu Zhang,Man Zhou,Kai Yang
Rapid charge separation and transfer is the key scientific problem in photocatalysis. The construction of S-scheme heterojunction is one of the effective strategies to promote charge separation and maintain the strong redox properties. Herein, the NiO, K0.2WO3, and NiWO4ternary double S-scheme K0.2WO3/NiO/NiWO4heterojunction (W/NiO) was created by a one-step molten salt method. Ultraviolet-visible (UV-Vis) diffuse reflectance spectra, photoluminescence (PL) spectra, photoelectrochemistry tests, and other analyses revealed that the double S-scheme heterostructure broadened the spectral response range of NiO and promoted its separation of photocarriers. Compared with pristine NiO, the modified double S-scheme heterojunction enhanced the surface adsorption of water molecules and the accumulation of intermediate product of HCOO−, and optimized the CO2reduction system, realizing the improved CO yield of 373 μmol·g−1·h−1in Ru(byp)32+/ethanolamine of CO2reduction system. This study indicates that double S-scheme heterojunction could facilitate efficient photogenerated charge transfer and separation, thereby achieving high activity and selectivity for CO2photoreduction. Our work provides a reference for the one-step construction of double S-scheme heterojunction.
研究领域:
材料科学
·
环境科学
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高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Cui Zhiqing,Wu Hao,Li Mingyue,Lv Liwei,Chen Huamao,Huang Jiawang,Li Taotao,Hu Jinwu,Fang Caihong
Exploration of efficient and nonprecious electrocatalysts
is essential
to propel water electrolysis toward developing a sustainable world.
Herein, we demonstrated heterogeneous Ni–NiWO 4 nanostructures
grown in situ on nickel foam (NF) (Ni–NiWO 4 /NF),
serving as effective bifunctional electrocatalysts toward the hydrogen
evolution reaction (HER) and urea oxidation reaction (UOR), enabling
high-performance overall urea splitting reaction (OUS) in both freshwater
and seawater. The favorable porous architecture provides a large electrochemically
active surface area and facilitates mass transfer. The coupling between
Ni nanoparticles and the NiWO 4 matrix creates an electron-rich
microenvironment and modulates the electronic states of the active
sites, which provides optimal chemical affinities for various reaction
intermediates, as confirmed by our calculation through density functional
theory calculations. Specifically, the Ni–NiWO 4 /NF
electrocatalyst exhibits low overpotentials of 26 mV@10 mA cm –2 , 126 mV@100 mA cm –2 , and 156 mV@200
mA cm –2 in alkaline freshwater and 31 mV@10 mA cm –2 , 162 mV@100 mA cm –2 , and 212 mV@200
mA cm –2 in alkaline seawater for the HER. Remarkably,
the overpotential is as low as 265 mV, even when the current density
was evaluated to be as high as 1.0 A cm –2 . For the
UOR, it demonstrates low potentials of 1.292 V@10 mA cm –2 , 1.343 V@100 mA cm –2 , and 1.374 V@200 mA cm –2 in alkaline freshwater and 1.307 V@10 mA cm –2 , 1.358 V@100 mA cm –2 , and 1.387 V@200 mA cm –2 in alkaline seawater. Notably, the recorded voltage
for the OUS reaction decreases to 1.366 V in freshwater and 1.390
V in seawater. Additionally, the catalyst demonstrates excellent long-term
stability in seawater for 100 h at 10 mA cm –2 . Furthermore,
we successfully demonstrated solar-powered green hydrogen production
at a rate exceeding 510 L h –1 m –2 , showcasing its strong potential for the practical application of
direct solar-to-hydrogen conversion.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 20
·10907-10913
·
IF 2.936
Meng-Qing Li,Yu-Long Ma,Xiao-Xia Ma,Yong-Gang Sun,Zhi Song
In this work, a mesoporous silica microsphere (MSM) was selected as a support to prepare a bimetallic supported catalyst (15% W–5% Ni/MSM) by a co-impregnation method that was simple and easy to conduct. We wished to improve the capability of catalytic conversion of biomass into ethylene glycol (EG) and 1,2-propylene glycol (1,2-PG). 15% W–5% Ni/MSM was examined on microcrystalline cellulose (cellulose) and corn stalks in a one-pot catalytic process, and total yields of EG and 1,2-PG reached up to 82.40 wt% and 62.60 wt%, respectively. This remarkable catalytic performance of W–Ni/MSM catalyst could be attributed to the synergistic effect between the active sites of Ni and W and the unique structure of MSM, which was suitable for mass transfer and metal loading. Based on physicochemical characterizations, the metal component was well-distributed on the surface of the MSM, and the metallic Ni, W and WO3 of the fresh catalyst were converted mainly into NiWO4 during the catalytic conversion of cellulose. To shed light on the reaction mechanism of the catalyzed hydrogenation of biomass, a possible process involving the formation of HxWO3 homogeneous catalysts, cellulose hydrolysis, C–C cleavage and hydrogenation conversion to 1,2-PG and EG was illustrated. Furthermore, the reusability of W–Ni/MSM catalyst was tested and we explored the cause of decreased diols yields. In summary, this work provides important guidance to rationally design effective catalysts for biomass conversion.
研究领域:
催化
·
材料科学
·
化学工程
·
可再生能源
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PubMed
高影响因子
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