Nanoscale
·
2024
·Vol. 16
·期 48
·22350-22359
·
IF 5.8
Weiping Xiao,Yue Zhang,Changwang Ke,Qin Zhao,Fengyan Han,Junpo Guo,Xiaofei Yang
Designing cost-effective and highly stable heterostructures with synergistic active sites could simultaneously catalyze the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) for (sea) water splitting. However, there are still challenges in maintaining the catalytic performance of individual materials and in constructing intimate interfaces. Herein, a novel corrosion engineering method is provided to prepare self-standing Fe2O3-Pt/NF nanoflowers where ultra-small amounts of Pt combined with Fe2O3 are in situ grown on nickel foam (NF) in the corrosion system of “H2PtCl6–NaCl–FeCl3”. The synthesized Fe2O3-Pt/NF shows the presence of a Pt–O bond, which can regulate the electronic structure of the active sites and optimize the binding energy of the reaction intermediates, leading to an improvement in catalytic performance. Compared with Pt/NF and FeOOH/NF, the Fe2O3-Pt/NF heterostructure exhibits remarkable electrocatalytic activities with overpotentials reaching 94 mV and 265 mV for the HER and OER, respectively, at a high current density of 100 mA cm−2 in alkaline solution. Furthermore, the self-assembled electrolytic cell employing Fe2O3-Pt/NF as the bifunctional electrode only requires potentials of 1.60 V and 1.61 V to achieve a current density of 100 mA cm−2 in overall water and seawater splitting, respectively. This material remained stable for 10 hours without obvious attenuation, indicating its good environmental adaptability and stability. Specifically, the enhanced catalytic activity and stability can be ascribed to the abundant active sites of nanoflowers, fast electron transfer rate of intimate interfaces, and strong electronic interaction between Pt atoms and Fe2O3. This work provides a new insight into the construction of highly efficient co-catalysts with intimate interfaces based on corrosion engineering methods.
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
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Li Xiaodong,Wang Zhi,Zhang Zemin,Chen Lulu,Cheng Jianli,Ni Wei,Wang Bin,Xie Erqing
The photoelectrochemical (PEC) water splitting is hampered by strong bonds of H 2 O molecules and low ionic conductivity of pure water. The photocatalysts dispersed in pure water can serve as a water activation agent, which provides an alternative pathway to overcome such limitations. Here we report that the light illuminated α−Fe 2 O 3 /Pt nanoparticles may produce a reservoir of reactive intermediates including H 2 O 2 , ·OH, OH − and H + capable of promoting the pure water reduction/oxidation half−reactions at cathode and highly photocatalytic−active TiO 2 /In 2 S 3 /AgInS 2 photoanode, respectively. Remarkable photocurrent enhancement has been obtained with α−Fe 2 O 3 /Pt as water activation agent. The use of α−Fe 2 O 3 /Pt to promote the reactivity of pure water represents a new paradigm for reproducible hydrogen fuel provision by PEC water splitting, allowing efficient splitting of pure water without adding of corrosive chemicals or sacrificial agent.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Zhang Tian,Zheng Qiang,Fu Yike,Xie Congkun,Fan Gonglin,Wang Yifan,Wu Yongjun,Cai Xiujun,Han Gaorong,Li Xiang
Sonodynamic therapy (SDT), presenting spatial and temporal control of ROS generation triggered by ultrasound field, has attracted considerable attention in tumor treatment. However, its therapeutic efficacy is severely hindered by the intrinsic hypoxia of solid tumor and the lack of smart design in material band structure. Here in study, fine α-Fe 2 O 3 nanoparticles armored with Pt nanocrystals (α-Fe 2 O 3 @Pt) was investigated as an alternative SDT agent with ingenious bandgap and structural design. The Schottky barrier, due to its unique heterostructure, suppresses the recombination of sono-induced electrons and holes, enabling superior ROS generation. More importantly, the composite nanoparticles may effectively trigger a reoxygenation phenomenon to supply sufficient content of oxygen, favoring the ROS induction under the hypoxic condition and its extra role played for ultrasound imaging. In consequence, α-Fe 2 O 3 @Pt appears to enable effective tumor inhibition with imaging guidance, both in vitro and in vivo. This study has therefore demonstrated a highly potential platform for ultrasound-driven tumor theranostic, which may spark a series of further explorations in therapeutic systems with more rational material design. Graphical Abstract
研究领域:
纳米技术
·
生物医学工程
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癌症治疗
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 20
·13556-13563
·
IF 3.9
Xia Xu,Mingqiang Li,Liming Yang,Bing Hu
Reasonable design of bimetallic nanomaterials with support is beneficial to improve catalytic performance. This work reports a new kind of sodium sesquicarbonate-supporting Fe2O3@Pt via etching Fe3O4@Pt@SiO2, which exhibits highly efficient and stable catalytic reduction performance towards 4-NP. Sodium sesquicarbonate-supporting Fe2O3@Pt has an interconnected one-dimensional network structure that provides sufficient channels for mass transfer. At the same time, a large amount of Fe2O3@Pt is exposed on its surface, which hinders the aggregation of pt clusters and Fe2O3 nanoparticles, and facilitates the direct contact of Fe2O3@Pt reaction sites with reactant molecules, thus improving the catalytic rate of 4-NP reduction reaction. Moreover, the introduction of non-metallic Fe can not only reduce the consumption of precious metal Pt, but also improve the catalytic efficiency due to the synergistic effect. This study opens up a new avenue to develop robust catalysts for heterogeneous catalytic reactions.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2026
·
IF 8.1
Su-Yun Zhang,Zhu Ding,Zihao Wang,Junzhe Tao,Yu-Jia Zeng
The pursuit of strong, tunable, and thermally robust exchange bias (EB) is not only a fundamental scientific challenge but also a critical prerequisite for advancing spintronic technologies. Bottom-up designed nanostructures offer a versatile platform for engineering EB, owing to their precise control over composition, morphology, and assembly. However, studies on the EB effect in MOF-derived magnetic nanocomposites remains less unexplored. This study reports the EB effect in α-Fe2O3/Pt composites obtained via the pyrolysis of Hofmann-like Pt/Fe MOFs at 450 °C, 550 °C, and 650 °C. The results show that Pt particles are dispersed on the α-Fe2O3 particles, forming α-Fe2O3/Pt composites. The magnetic properties of samples are characterized by zero-field-cooled (ZFC) and field-cooled (FC) susceptibility as well as hysteresis loop measurements. Notably, a significant EB effect is observed in all samples and the optimized sample pyrolyzed at 450 °C exhibits the largest HEB of 2099 Oe at 2 K under a cooling field of 60 kOe, which exceeds that of pure α-Fe2O3 and other α-Fe2O3 based composites. These findings highlight calcination temperature as a critical parameter for tailoring EB effect in MOF-derived oxide/metal nanocomposites.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 3
·e4208
·
IF 3.581
Yan Gao,Jiasheng Fang,Yiwei Zhang,Chao Zhang,Shuo Zhao,Yuming Zhou,Mengqiu Huang,Xiaoli Sheng
A facile strategy is reported for the fabrication of Pt-loaded core–shell nanocomposite ellipsoids (Fe 2 O 3 -Pt@DSL) consisting of ellipsoidal Fe 2 O 3 cores, double-layered La 2 O 3 shells and deposited Pt nanoparticles (NPs). The formation of the doubled-shelled structure uses Fe 2 O 3 -Pt@mSiO 2 as template sacrificial agent and it involves the re-deposition of silica and self-assembly of metal oxide units. The preparation methods of double-shelled metal oxides avoid repeated coating and etching and could be utilized to fabricate other shaped double-shelled composites. Characterization results indicated that the Fe 2 O 3 -Pt@DSL nanocomposites possessed mesoporous structure and tunable shell thickness. Moreover, due to the formation of Fe 2 O 3 and La 2 O 3 composites, Pt NPs can also be stabilized via deposition on chemically active oxides with a synergistic effect. Therefore, as a catalyst for the reduction of 4-nitrophenol, Fe 2 O 3 -Pt@DSL showed superior catalytic activity and reusability due to structural superiority and enhanced composite synergy. Finally, well-dispersed Pt NPs were encapsulated into the void between the shell layers to construct the Fe 2 O 3 -Pt@DSL-Pt catalyst.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）