Journal of Materials Chemistry A
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2023
·Vol. 11
·期 43
·23270-23277
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IF 11.9
Xiaoyun Zhang,Shifan Zhu,Yixue Xu,Yuqiao Wang
The tip effect of the high curvature tip top can cause electromagnetic effects to improve the catalytic performance. Doping of transition metals (Cr, Fe and Mo) into CoP array nanocones alters the tip curvature of CoP to strengthen the tip effect with increasing curvature. The stronger tip effect of Fe-CoP improves OH− concentration, accelerates surface charge transfer and enhances the electric field for a higher catalytic efficiency. Fast charge transfer and high electronic conductivity are attributed to transition metal doping, which can be confirmed by theoretical simulations and experiments. The optimized d-band centre of Fe-CoP adjusts the appropriate adsorption strength of the reaction intermediates. Fe doping endows CoP with a higher curvature cone structure and optimizes electronic structure for high catalytic activity and reaction kinetics. Tip cone as special sites tuned by transition metal doping provides a strategy for efficient non-noble metal catalysis.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mei Li,Shengbo Zhang,Mohammed Ahmed Abdulraheem Alwafi,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
The morphology of catalysts is a key factor influencing their photocatalytic performance. Herein, we prepared three W 18 O 49 photocatalysts with different morphologies of sea urchin (W 18 O 49 SU), nanorod (W 18 O 49 NR) and hollow sphere (W 18 O 49 HS), and evaluate their performances in photocatalytic hydrolysis of ammonia borane (AB). Remarkably, W 18 O 49 SU exhibited an impressive photocatalytic H 2 production rate with the highest TOF of 53.1 min −1 under visible light, which is 10.4 and 7.5 times higher than those of W 18 O 49 HS and W 18 O 49 NR, respectively. The comprehensive characterizations and control experiments revealed that the unique sea urchin-like morphology enabled the strong light harvesting by multiple light scattering, fast separation of photogenerated charges and directional electron enrichment by nanotip effect, which collaboratively boost the photocatalytic activity . Moreover, the enhancement effect of sea urchin-like morphology is again approved well on Nb 2 O 5 photocatalysts. This work opens a paradigm to synergistically improve light harvesting and charge separation efficiency through rational design of photocatalyst nanostructure .
研究领域:
材料科学
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光催化
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纳米技术
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Teng Yu,Kai Zhang,Jingwen Liu,Yun Chen,Baoquan Jiang,Yufang Chen,Xianxian Shi,Caixia Li
Amorphous structures have been widely applied in zinc anode protection, due to their optimized ion diffusion paths and abundant dangling bonds. However, the amorphization process significantly impairs structural stability which reduces the cycling performance. To address this challenge, researchers incorporated a silicon-based coupling agent into the c-AS-UiO system, achieving performance optimization by regulating the amorphous structure. The reconstructed material forms a flexible Zr Si O network, which can form a strong bonding interaction with the zinc substrate. Both theoretical calculations and experimental results confirm that this unique network structure can effectively improve the mechanical properties of the solid electrolyte interphase (SEI), thereby adapting to the volume fluctuations of the anode during battery cycling. Meanwhile, the introduction of silicon also stabilizes the system by dispersing electrons, and mitigates the tip effect caused by ion aggregation. Ultimately, under the protection of the stable SEI layer, uniform deposition of zinc ions is achieved, fundamentally suppressing the problem of dendrite growth. Experimental results show that the symmetric cell composed of the zinc anode modified with c-AS-UiO (denoted as c-AS-UiO@Zn) achieves a cycle life of over 3300 h under 15 mA cm −2 and 1 mAh cm −2 . Furthermore, the full cell assembled by pairing this modified anode with MnO 2 cathode still maintains excellent cycling stability after 2000 cycles. This study provides a new direction for the application of amorphous materials in zinc anode protection, and also offers insights for achieving anode stability through the optimization of amorphous structures.
研究领域:
电化学
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储能
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材料科学
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电池技术
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纳米材料
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Chuhong Zhu,Qiangsheng Zhao,Dexian Huo,Xiaoye Hu,Xiujuan Wang
We report a simple electrodeposition strategy to fabricate highly surface-roughened Au nanostructure arrays grown on a silicon wafer . Finite element method simulation reveals that lots of hot spots were generated around the tips of nanothorns and in the gaps between neighboring nanothorns by both plasmon coupling and ‘‘lightning-rod’’ effects. It was found that roughening the as-electrodeposited Au nanocones by a subsequent second-step electrodeposition induced a six times improvement in SERS intensity. The peak intensities of SERS spectra show a narrow distribution with a small relative standard deviation of 6.6%, confirming the high uniformity of the fabricated thorny Au nanostructure array SERS substrate. A high SERS sensitivity of the fabricated thorny Au nanostructure arrays was confirmed by a detectable concentration limit of 1 pM rhodamine 6G aqueous solutions. The SERS substrate also showed a high detection sensitivity toward ferbam with a limit of detection of about 2.40 nM. Calibration curves with a linear correlation of logarithmic SERS intensity with logarithmic concentration for R6G and 3,3′,4,4′-tetrachlorobiphenyl (PCB-77, a persistent organic pollutant) were achieved by using the fabricated rough gold nanoarrays, demonstrating a promising application in semi-quantitative or even quantitative detection. This work offered a facile but effective approach toward the rational designs of uniform, reproducible and sensitive SERS substrates for molecular detection.
研究领域:
材料科学
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纳米技术
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分析化学
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zeyi Guan,Liuyan Zhang,Yiqi Xie,Danting Wu,Binkai Yuan,Lichan Wu,Gengzhe Shen,Guibin Tan,Fujian Guo
Alkaline water electrolysis is recognized as an environmentally sustainable approach for generating high-energy-density clean hydrogen. However, its efficiency remains largely limited by the sluggish kinetics water dissociation in the hydrogen evolution reaction (HER), the challenge of activating water molecules, and the excessive consumption of OH − and high adsorption energy barriers of oxygenated intermediates during the oxygen evolution reaction (OER). In this work, A nanoneedle-structured Ru-NiCo₂O₄-Se electrocatalyst was developed, demonstrating excellent bifunctional electrocatalytic performance for both HER and OER. Through a combination of experimental characterizations and theoretical simulations, it had been revealed that the sharp-tip nanoneedle morphology generates intense local electric fields. These fields facilitate the enrichment of K + ions at the cathode, optimized the interfacial water structure, and substantially lower the energy barrier required for water dissociation. At the anode, the tip effect facilitated OH − accumulation, enhanced reactant mass transport, and accelerated OER kinetics. Moreover, metal–support interactions (MSI) between Ru nanoclusters and the support effectively modulate the adsorption behavior of H* and oxygenated intermediates, further boosting catalytic performance. The catalyst achieves overpotentials as low as −48 mV for HER and + 231 mV for OER at a current density of 10 mA·cm −2 , and delivers a high overall water splitting current of 100 mA·cm −2 at a cell voltage of only 1.7 V, along with remarkable long-term durability over hundreds of hours. This study presents an innovative strategy based on interfacial microenvironment engineering and electronic structure modulation, paving a fresh pathway for the development of cost-effective, high-performance, and long-lasting bifunctional electrocatalysts tailored for clean energy conversion.
研究领域:
电催化
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可再生能源
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材料科学
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氢气生产
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纳米材料
✓ 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）