JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Yin'an Zhu,Jia Yao,Tao Lu,Ye Pan
Rationally designing a strongly coupled heterostructure with rich functional sites and high catalytic stability is essential for efficient energy conversion. This work synthesizes a self-supported NiO/RuO 2 heterostructure for hydrogen production via facile dealloying following an in-situ electrochemical oxidation method. It only requires 88 ± 1 mV to drive a current density of −100 mA/cm 2 in the alkaline electrolyte during hydrogen evolution reaction (HER), outperforming NiO, RuO 2 , and Pt foil. The higher anodic potential applied to the dealloyed ribbons results in lower overpotentials and faster reaction kinetics. Meanwhile, the catalytic activity and stability of the individual NiO can be significantly improved once coupled with a small amount of heterogeneous RuO 2 . The strong synergistic effect between NiO and RuO 2 contributes to exposing abundant active sites, optimizing electronic structure, facilitating charge transfer at the interface, and most importantly, maintaining structural stability. These advantages make the self-supported NiO/RuO 2 heterostructure a promising candidate for replacing the Pt-based catalysts.
研究领域:
材料科学
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能源转换
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Wang Chuan,Cao Zhifen,Huang Hongtao,Liu Hong,Wang Sha
Nitrate pollution is already a global problem, and the electrocatalytic reduction of nitrate is a promising technology for the remediation of wastewater and polluted water bodies. In this work, Co3O4/Ti electrodes were prepared by electrodeposition for the electrocatalytic reduction of nitrate. The morphology, chemical, and crystal structures of Co3O4/Ti and its catalytic activity were investigated. Then, the electrocatalytic nitrate reduction performance of Co3O4/Ti as the cathode was evaluated by monitoring the removal efficiencies of nitrate (NO3−-N) and total nitrogen (TN), generation of reduction products, current efficiency (CE), and energy consumption (EC) at different operating conditions. Under the catalysis of Co3O4/Ti, NO3− was reduced to N2 and NH4+, while no NO2− was produced. After the introduction of chloride ions and IrO2-RuO2/Ti as the anode, NH4+ was selectively oxidized to N2. The removal efficiencies of NO3−-N (at 100 mg/L) and TN after 2 h were 91.12% and 60.25%, respectively (pH 7.0; Cl− concentration, 2000 mg/L; current density, 15 mA/cm2). After 4 h of operation, NO3−-N and TN were completely removed. However, considering the EC and CE, a 2-h reaction was the most appropriate. The EC and CE were 0.10 kWh/g NO3−N and 40.3%, respectively, and electrocatalytic performance was maintained after 10 consecutive reduction cycles (2 h each). The cathode Co3O4/Ti, which is prepared by electrodeposition, can effectively remove NO3−-N, with low EC and high CE.
研究领域:
环境科学
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电化学工程
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废水处理
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Danyang Wang,Shiwen Zhao,Jianke Li,Lin Shi,Yuhuan Zhang
The increasing bacterial resistance caused by the abuse of antibiotics has become an urgent global healthcare challenge. Recent advances in nanozymes represent one feasible solution. However, efforts have mainly focused on mimicking natural enzymes for comparable biocatalytic activities, as preparing nanozymes with superior antibacterial properties remains challenging. In this study, inspired by the Fe catalytic site in horseradish peroxidase (HRP), we synthesized defect-rich ruthenium oxide/iridium oxide heterojunction nanosheets (RuO 2 /IrO 2 ), using Ru, which possesses a similar electronic structure to Fe, as the catalytic site to enhance antibacterial properties. Benefiting from the typically high catalytic activity of Ru in various reactions and the unique Ir-mediated defect-rich heterostructure, RuO 2 /IrO 2 exhibits dramatically enhanced biocatalytic activities in generating reactive oxygen species crucial for eradicating bacteria. In particular, RuO 2 /IrO 2 exhibited both oxidase and peroxidase-mimicking activities with catalytic efficiency 10 3 to 10 4 times higher than that of HRP. It exhibited superior antibacterial properties as well as high biosafety , effectively eliminating H 2 O 2 toxicity during in vivo anti-infection measures. Minimum inhibitory concentration (MIC) values of RuO 2 /IrO 2 against Staphylococcus aureus and Escherichia coli were 31.25 and 15.62 μg mL −1 , respectively. This study offers a promising potential design for antibacterial nanozymes.
研究领域:
生物化学
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纳米医学
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微生物学
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产品关联
DOI
高影响因子
Environmental Science-Nano
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2019
·Vol. 6
·期 7
·2241-2252
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IF 7.704
Jinxi Feng,Jingxiang Sun,Xiaosheng Liu,Jinzhu Zhu,Ya Xiong,Shuanghong Tian
Two electrocatalysts Pt and RuO2 were directionally co-loaded on the nano-piezomaterial t-BaTiO3 by a two-step process: the alkali deposition–oxidation of RuO2 followed by the selective photo-reduction deposition of Pt. It was found that both Pt and RuO2 could considerably improve the piezo-degradation efficiency of t-BaTiO3 for pollutants. For the biorefractory pesticide tricyclazole, RuO2/t-BaTiO3/Pt possessed a piezo-degradation kinetic constant of 0.032 min−1. The rate constant was 3.11, 2.56 and 2.58 times that of t-BaTiO3, Pt/t-BaTiO3 and RuO2/t-BaTiO3, respectively. Moreover, the rate constant of RuO2/t-BaTiO3/Pt was greater than the sum (0.025 min−1) of the rate constants of two single-loaded materials, Pt/t-BaTiO3 and RuO2/t-BaTiO3. This indicates that co-loaded Pt and RuO2 in RuO2/t-BaTiO3/Pt have a synergistic enhancement effect on the piezo-degradation. By analyzing the kind and amount of the reactive oxygen species (˙OH, 1O2, ˙O2− and H2O2) from these nano-piezocatalytic systems, it was inferred that Pt acted as a cathodic- and anodic-like catalyst while RuO2 acted as an anodic-like catalyst. The mechanism of the synergistic catalysis for co-loaded Pt and RuO2 was similar to the principle of an electrolytic reactor, in which Pt and RuO2 were its two catalytic nano-electrodes and the power was from the piezo-potential of t-BaTiO3.
研究领域:
环境科学
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材料科学
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催化
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污染物降解
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Yilan Jiang,Zhibin Geng,Long Yuan,Yu Sun,Yingge Cong,Keke Huang,Lei Wang,Wei Zhang
The exsolution of noble metal nanoparticles (NPs) from perovskite usually requires high doping ratio of noble metal. Herein, we constructed a RuO2/LFRO composite by the exsolution of a low Ru-substituted A-site deficient perovskite, La0.9Fe0.92Ru0.08O3 (LFRO). In this process, pure Ru NPs are in situ exsolved from LFRO via a relatively low temperature heat treatment in 5% H2/Ar. Then the exsolved Ru NPs were oxidized to RuO2 for oxygen evolution reaction (OER) applications. The RuO2/LFRO composite achieved a high OER performance compared with the pristine LFRO, which is mainly originated from the generation of electrochemically active RuO2 NPs and the improvement of conductivity. In addition, the exsolution is a reversible process that the exsolved Ru NPs can disappear into the perovskite lattice at 550 °C in air. Our work thereof demonstrates an effective strategy to minimize the dosage of precious metals for catalytic applications in different fields.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yun Wu,Rui Yao,Kaiyang Zhang,Qiang Zhao,Jinping Li,Guang Liu
The use of proton exchange membrane (PEM) hydrolysis technology holds promise for eco-friendly hydrogen production using renewable energy sources. However, developing efficient, cost-effective, and durable bifunctional electrocatalysts for the acidic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains challenging. Here, we synthesized RuO 2 /CeO 2 heterojunction loaded on carbon spheres (RuO 2 /CeO 2 @C) via hydrothermal and annealing techniques to address this issue. Our experiments demonstrate exceptional catalytic activity of RuO 2 /CeO 2 @C for both OER and HER, with overpotentials of 170 and 120 mV, respectively, at 10 mA/cm 2 in 0.5 M H 2 SO 4 . Moreover, the electrocatalyst enables overall water splitting at 1.54 V and maintains stability for over 100 h at 10 mA/cm 2 . Density functional theory (DFT) calculations suggest that RuO 2 /CeO 2 heterojunction modifies d-band center of Ru, balances H adsorption/desorption behavior, accelerates reaction kinetics, and lowers the energy barrier, thereby enhancing electrocatalytic activity. These findings provide valuable insights for future efficient bifunctional water splitting electrocatalyst design.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Nano Today
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2024
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IF 13.2
Yuyang Li,Faheem Muhammad,Xiwen Chen,Deao Gu,Wen Li,Jiayi Tang,Mingyue Cheng,Jiang Du,Shuwei Qiao,Yu Deng,Qing Yu,Hui Wei,Leiying Miao
Nanozymes have emerged as promising nanomaterials for the treatment of inflammation-related diseases by eliminating excessive reactive oxide species (ROS) and immunoregulation. However, persistent inflammation invariably causes severe alveolar destruction in periodontitis; and the alleviation of inflammation alone by neglecting the impairment of vascular functions could not effectively realize periodontal regeneration. Herein, a multifunctional copper-ruthenium oxide-based yolk-shell nanozyme (Cu 2 O@RuO 2 , CRNC) is designed to promote effective periodontal regeneration. The ruthenium oxide (RuO 2 ) shell serves to alleviate inflammation by eliminating ROS and triggering macrophage polarization, whereas the cuprous oxide (Cu 2 O) core acts as a responsive Cu 2 + nano-reservoir for promoting angiogenesis and osteogenesis. Results demonstrated that CRNC could activate transforming growth factor β/phosphatidylinositol 3-kinase (TGF-β/PI3K) and hypoxia-inducible factors (HIF-1α) signals, aiding angiogenesis in the human umbilical vein endothelial cells and osteogenesis in periodontal ligament stem cells, respectively. The multifunctional CRNC nanozyme successfully decreased periodontal inflammation and ameliorated alveolar regeneration in a periodontitis model. This study provides promising insights into periodontitis treatment by targeting both angiogenesis and osteogenesis.
研究领域:
牙科学
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纳米医学
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炎症研究
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组织工程
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产品关联
DOI
高影响因子
RARE METALS
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2024
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IF 9.6
Cai Jia-Lin,Fan Jing-Yi,Zhang Xu-Dong,Xie Xin,Tian Wan-Yu,Zhang Xin-Gang,Ding Jie,Liu Yu-Shan
Efficient bifunction electrocatalyst is extremely interesting for electrochemical overall water splitting (OWS). Herein, a new RuO 2 -Ru/MoO 2 @CC (RRM/CC) bifunctional electrocatalyst was prepared via a solid phase reaction strategy. To obtain a suitable precursor for SPR, MoS 2 nanosheets and RuO 2 nanoparticles (NPs) were sequentially loaded onto carbon cloth conductive substrate. Subsequently, the prepared RuO 2 /MoS 2 /CC precursor was sealed in a furnace and annealed in Ar to trigger the redox SPR. After SPR, active RuO 2 -Ru/MoO 2 units containing metal–metal oxide interfaces were formed on CC substrate uniformly. The optimized RRM/CC sample annealed at 400 °C exhibited a overpotential of 13 mV for hydrogen evolution reaction (HER) and 231 mV for oxygen evolution reaction (OER) at 10 mA·cm −2 under alkaline condition, respectively, which can be deduced to the modulated electronic structure and unique hierarchical structure. In addition, a low cell voltage of 1.48 V for OWS was required at 10 mA·cm −2 under alkaline condition. Meanwhile, RRM/CC exhibited excellent pH-independent durability. Graphical abstract
研究领域:
材料科学
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电化学
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DOI
高影响因子
MICROCHIMICA ACTA
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2022
·Vol. 189
·期 7
·1-10
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IF 6.408
Li Haolin,Sun Huiyuan,Ding Jianwei,Wu Ting,Cai Shuangfei,Wang Chen,Yang Rong
The successful synthesis of ruthenium oxide/reduced graphene oxide (RuO 2 /rGO) heterostructures by one-pot hydrothermal method using graphene oxides and RuCl 3 as precursors is reported. The heterostructures had high peroxidase-like (POD-like) activities, which catalyzes the oxidation of classical peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to create a blue colored reaction product. The catalytic activity was significantly enhanced by the synergistic effect between RuO 2 nanoparticles and rGO. RuO 2 /rGO had a low K m of 0.068 mM and a high v max of 1.228 × 10 −7 M·s −1 towards TMB in the TMB-H 2 O 2 catalytic oxidation system. In addition, the POD-like activity originating from the electron transfer mechanism was confirmed by cytochrome C (Cyt C) oxidation experiment. A colorimetric method based on RuO 2 /rGO heterostructures was developed with good sensitivity and selectivity for glucose detection with a limit of detection of 3.34 μM and a linear range of 0–1500 μM. The RuO 2 /rGO heterostructures have potential applications in the biomedical areas, such as biosensor and diagnostics. Graphical abstract
研究领域:
生物传感器
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分析化学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Yijie Liu,Bojie Li,Zhu Cheng,Chao Li,Xiaoyu Zhang,Shaohua Guo,Ping He,Haoshen Zhou
The all-solid-state Li-air battery is a promising next-generation energy storage technique because of its high safety and high theoretical specific energy density . The all-solid-state Li-air batteries with LAGP as electrolyte layer , Li foil as anode and a mixture composed of single-walled carbon nanotubes (SWCNTs), RuO 2 nanoparticles and Li 1.5 Al 0.5 Ge 1.5 P 3 O 12 (LAGP) as composite cathode were investigated in ambient air at room temperature . Charge overpotential was reduced because of the superior catalytic activities of RuO 2 nanoparticles . Besides, SEM images showed the formation of chip-like products after discharge to 1000 mA h g -1 and wrinkles-like products after fully discharged to 2 V, respectively. Galvanostatic intermittent titration technique (GITT) demonstrated that the equilibrium voltage of all-solid-state Li-air batteries cycling in oxygen kept stable at 2.96 V while that cycling in ambient air maintained at 3.15 V. These results indicated that the electrochemical reactions of all-solid-state Li-air batteries can be ascribed to the formation and decomposition of lithium peroxide in oxygen and electrochemical reaction with moisture in air.
研究领域:
材料科学
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能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2025
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IF 4.6
Xin Hu,Wei Cheng,Xin Zhang,Tianyi Wang,Shaoheng Cheng,Nan Gao,Hongdong Li
The noble metal oxide RuO2 is an efficient catalyst for the oxygen evolution reaction (OER), and its catalytic activity can be significantly improved by Ru exsolution and subsequent oxidation to RuO2 nanoparticles on the perovskite surface. Conventional methods typically require sequential H2/Ar reduction for Ru exsolution followed by oxidation, which complicates the process and introduces potential safety hazards. Herein, we propose introducing nanodiamond (ND) into La0.9Fe0.92Ru0.08O3 (LFR) gels for ambient calcination. ND facilitates Ru exsolution and oxidation to RuO2, significantly simplifying RuO2/LFR preparation. The ND-modified RuO2/LFR exhibits high OER activity, achieving an overpotential of 275 mV at 10 mA cm–2 and a Tafel slope of 48.16 mV decade–1. This Tafel slope represents a 50% reduction compared to that of pure RuO2. Furthermore, the catalyst retains 84% of its initial current density after 24 h. Our work provides insight into enhancing electrocatalytic activity by a one-step in situ exsolution of metal oxides.
研究领域:
电催化
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材料科学
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能量转换
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纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Bao Liu,Kexuan Lyu,Yongqiang Chen,Baozhong Ma,Chengyan Wang
Manganese electrodeposition experiments were performed in an anion-exchange membrane (AEM) electrolysis reactor using Ti/IrO 2 –RuO 2 –SiO 2 anode. The influence of Mn 2+ concentration, cathode current density (CCD), (NH 4 ) 2 SO 4 concentration, SeO 2 concentration and electrolysis time on the cell voltage (CV), cathode current efficiency (CE) and specific energy consumption (SEC) of manganese electrodeposition was investigated. The crystalline structure, chemical composition and morphology of the deposited manganese metal and the generated dark mass were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS) measurements. The obtained results reveal that the crystalline structure of the deposited manganese metal was α-Mn. The dark mass of MnOOH would be generated and precipitated on the surface of the cathode, inhibiting the electrodeposition of manganese metal when the operating condition was not well controlled. Considering the CE, SEC and environmental aspect, the operating condition of Mn 2+ concentration = 30 g L −1 , CCD = 350 A m −2 , (NH 4 ) 2 SO 4 concentration = 110 g L −1 and SeO 2 concentration = 0.03 g L −1 was regarded as the best condition for manganese electrodeposition. Under this condition, the CE was 78.3% and the SEC was 4346–4433 kW h t −1 after electrolyzing for 24 h. Compared with the traditional approach, the CE increased by about 10% and the SEC decreased by about 27%. In addition, the electrolytic manganese anode slime was not generated during the manganese electrodeposition process . This approach is recommended as it will reduce the energy consumption and the quantities of solid waste discharge of manganese electrodeposition.
研究领域:
材料科学
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电化学工程
✓ 已验证
DOI
高影响因子
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