ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Weiwei Han,Xinuo Cai,Jiahong Liao,Yi He,Chunlin Yu,Xingwang Zhang
The development of proton exchange membrane water electrolysis is a promising technology for hydrogen production, which has always been restricted by the slow kinetics of the oxygen evolution reaction (OER). Although IrOx is one of the benchmark acidic OER electrocatalysts, there are still challenges in designing highly active and stable Ir-based electrocatalysts for commercial application. Herein, a Ru-doped IrOx electrocatalyst with abundant twin boundaries (TB-Ru0.3Ir0.7Ox@ITO) is reported, employing indium tin oxide with high conductivity as the support material. Combing the TB-Ru0.3Ir0.7Ox nanoparticles with ITO support could expose more active sites and accelerate the electron transfer. The TB-Ru0.3Ir0.7Ox@ITO exhibits a low overpotential of 203 mV to achieve 10 mA cm–2 and a high mass activity of 854.45 A g–1noble metal at 1.53 V vs RHE toward acidic OER, which exceeds most reported Ir-based OER catalysts. Moreover, improved long-term stability could be obtained, maintaining the reaction for over 110 h at 10 mA cm–2 with negligible deactivation. DFT calculations further reveal the activity enhancement mechanism, demonstrating the synergistic effects of Ru doping and strains on the optimization of the d-band center (εd) position and the adsorption free energy of oxygen intermediates. This work provides ideas to realize the trade-off between high catalytic activity and good stability for acidic OER electrocatalysts.
研究领域:
材料科学
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电化学
·
催化科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 30
·11949-11956
·
IF 8.262
Lian-Kui Wu,Xin-Yu Liu,Ji-Ming Hu
Ti-supported IrO2 or RuO2 oxide coated electrodes are widely used for the oxygen evolution reaction (OER) in acidic media. Electrocatalytic activity and long-term stability need to be further improved for these types of electrodes. A highly porous and well-adhered electrodeposited SiO2 (e-SiO2) film is proposed as the interlayer in this work to meet the above-mentioned requirements. The results show that the active oxide fully fills in the porous network throughout the whole thickness of the e-SiO2 film, to form “total-depth” highly porous oxide electrocatalytic coatings. For this reason, more than 1 order of magnitude higher apparent activity towards the OER at the Ti/e-SiO2/IrO2 (or RuO2) electrode is achieved compared to that of the conventional Ti/IrO2 or Ti/RuO2 electrode. Literature survey indicates that these novel electrodes are one of the most active Ti electrodes ever reported. The service life of this type of electrode is also obviously enhanced due to the “inter-locking” structure formed between the active oxide layer and e-SiO2 film.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 37
·期 6
·1180-1184
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IF 1.6
Song Xuyan,He Yunlu,Peng Sanwen,Wang Bo,Dong Ping,Tang Haolin,Yu Jun
We reported sol-gel-derived Nb-doped SnO 2 which is an effective catalyst carrier for deposition of IrO 2 , and the electrocatalytic activity of the synthesized catalysts for OER was investigated. It is found that the doping of Nb can refine the SnO 2 crystal grains and improve the electrical conductivity of SnO 2 . When the doping amount of Nb is 7%, the electrical conductivity of Nb-SnO 2 reaches a maximum value of 3.54 S/cm. With the increase in the loading amount of IrO 2 , the electrocatalytic activity towards OER of the thus-synthesized catalysts is improved, reaching a comparable OER activity with pristine IrO 2 with the loading content of about 44wt%.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shuang Zhao,Tong Bu,Kairong Yang,Zhihao Xu,Feier Bai,Kunyi He,Lihua Li,Li Wang
Salbutamol (SAL), a β-2 adrenoreceptor agonist, is an unpopular addition to livestock and poultry, causing several side effects to human health. Thus, it is very important to develop a simple and rapid analytical method to screen SAL in the field of food safety. Here, we present an immunochromatographic assay (ICA) method for sensitively detecting SAL with polydopamine-decorated iridium oxide nanoparticles (IrO2@PDA NPs) as a signal tag. The IrO2@PDA with excellent hydrophilicity, biocompatibility, and stability was synthesized by oxidating self-polymerization of dopamine hydrochloride (DAH) on the surface of IrO2 NPs and used to label monoclonal antibodies (mAbs) through simple physical adsorption. Compared with IrO2 NPs, the IrO2@PDA also possessed superior optical properties and higher affinity with mAbs. With the proposed method, the limit of detection for SAL was 0.002 ng/mL, which was improved at least 24-fold and 180-fold compared with the IrO2 NPs-based ICA and conventional gold nanoparticles-based ICA, respectively. Furthermore, the SAL residuals in pork, pork liver, and beef were successfully detected by the developed biosensor and the recoveries ranged from 85.56% to 115.56%. Briefly, this work indicated that the powerful IrO2@PDA-based ICA can significantly improve detection sensitivity and has huge potential for accurate and sensitive detection of harmful small molecules analytes in food safety fields.
研究领域:
分析化学
·
纳米技术
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-13
·
IF 5.3
Li Zehao,Jing Weixuan,Yang Zhenwei,Gao Weizhuo,Zhou Fan,Han Feng,Mao Qi,Zhao Libo,Yang Zhaochu,Jiang Zhuangde
A low-hysteresis coaxial pH sensor was presented for continuous soil monitoring. The electrolyte was irradiated with ultraviolet (UV) light for different durations, and then used for the electrodeposition of the IrO x film onto the front end of a stainless-steel wire, forming the working electrode. The reference membrane/AgCl/Ag paste (reference electrode) was coaxially integrated onto the insulated middle section of the working electrode, creating the pH sensor. It is found that the UV irradiation treatment generates sufficient hydroxyl radicals in the electrolyte, which increases the proportion of IrO 2 on the surface of the formed IrO x film and further enhances its reversible surface reactions with H + . The reference electrode is reliably integrated with the working electrode, which effectively miniaturizes the pH sensor for soil monitoring. With the UV irradiation duration optimized to be 2 days, the sensitivity and hysteresis voltage of the pH sensor were determined to be -74.8 mV/pH and 3 mV, respectively. The pH sensor maintained a stable potentiometric response even when bent to a 180° angle or subjected to 50 bending cycles. Moreover, the pH values of six soil samples were reliably determined, and the pH variations in a soil sample were monitored over an 11-day testing period. These results benefit accurate and continuous pH monitoring in agricultural and livestock applications. Graphical
研究领域:
传感器
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电化学
·
土壤科学
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环境监测
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Hao Li,Qingni Yu,Bin Yang,Zhongjian Li,Lecheng Lei
Galvanostatic anodic oxidation of artificial human urine (AHU) was carried out by using boron doped diamond (BDD) and IrO 2 electrodes respectively. It was found that organic compounds in urine could be almost completely mineralized in a few hours and ammonia may be oxidized into N 2 by the electro-catalytic process. However, the oxidation processes were highly dependent on the electrode materials. On the non-active BDD electrode complete oxidation occurred, and the final oxidation products of inorganic ions, including ClO 4 − and NO 3 − , were formed. Whereas on the active IrO 2 electrode, the final products generated and left in solution were highly toxic substances, including N 2 H 4 and NO 2 − , because the oxidizing activity on the IrO 2 electrode surface is relatively low. The pH values during the degradation process were monitored and the corresponding degradation mechanisms and pathways on both electrodes are proposed based upon the measured inorganic intermediates.
研究领域:
环境科学
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电化学
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水处理技术
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生物医学工程
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分析化学
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2025
·
IF 6.2
Kejun Tu,Qingyuan Chen,Hao Zheng,Qingda Xu,Chunpeng Jiang,Jiawei Cao,Dongyang Wen,Zixing Li,Ning Wei,Haoyuan Chen,Bin Yang,Jiayi Zhang,Longchun Wang,Jingquan Liu
High-density neural interfaces are pivotal for advancing visual brain-computer interfaces (BCIs), where decoding complex perceptual information necessitates large-scale and high-fidelity neural recordings. Conventional silicon-based probes, however, provoke chronic neuroinflammation and glial scarring, limiting their utility for longitudinal studies. To overcome these challenges, we design and fabricate a high-density flexible vision probe (HFVP) featuring 128 channels, reliable packaging (compact ball grid array), and ultrathin form factor (≈1.2 µm). The electrode sites are further modified with biocompatible iridium oxide (IrO x ) film to improve the electrochemical performance by an order of magnitude, facilitating high-fidelity neural signal acquisition. In vivo recordings of the mouse's primary visual cortex (V1) have demonstrated HFVP's capacity for large-scale neural recording and revealed that neurons with preferences for visual stimuli exhibit higher spike correlation. Moreover, the stability of the HFVP is assessed for over sixteen weeks without apparent degradation. The HFVP presented in this work provides a stable and effective tool for chronic neural recording in the visual cortex and prospective applications in vision reconstruction.
研究领域:
神经工程
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生物医学工程
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神经科学
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脑机接口
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生物材料
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电生理学
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视觉系统
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·5841-5851
·
IF 3.741
Zhi Ming Wang,Peng Liu,Yan Peng Cao,Feng Ye,Chao Xu,Xiao Ze Du
Summary In this study, novel Pt-IrO 2 nanofiber catalysts for oxygen evolution reaction (OER) were successfully prepared using the electrospinning method with a high-concentration precursor solution. The composition and structure of catalysts were characterized, and the electrocatalytic performance of the nanofiber catalysts in water electrolysis was investigated from various aspects such as overpotential, charge transfer resistance, and exchange current density. Special attention was paid on the effect of Pt/Ir ratio on the electrocatalytic activity of the electrospun nanofibers. The results showed that the Pt-IrO 2 nanofiber catalysts with average fiber diameters ranging from 10 to 100 nm can be successfully obtained by the electrospinning method, and the average diameter decreased with the increase of Pt content. Since a bigger amount of IrO 2 content and a thinner fiber structure are all beneficial to the electrocatalytic performance, the Pt-IrO 2 catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 both showed better catalytic performance for OER than the commercial IrO 2 , which was also demonstrated by the lower charge transfer resistance and higher exchange current density. As a result, the overpotentials of Pt-IrO 2 catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 are 50 mV and 32 mV lower than the overpotential of the commercial IrO 2 at 30 mA cm −2 in 0.5 M H 2 SO 4 , respectively. The electrospun Pt-IrO 2 nanofiber catalyst with proper Pt content seems to be very promising since it can not only improve the catalytic performance and the safety of PEM electrolysis cells, but also reduce the amount of more expensive Ir in catalysts.
研究领域:
材料科学
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电化学
·
纳米材料
·
能源化学
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催化化学
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-13
·
IF 23.2
Zhang Hao,Zhu Liyan,Shen Yuhan,Wu Mingjuan,Tian Tian,Tang Haolin
Slow oxygen evolution reaction (OER) and material transport impedance in catalyst-coated membrane (CCM) are major challenges for the practical proton exchange membrane water electrolyzer (PEMWE). Herein, we present a novel OER catalyst by polyether-derived composite oxide pyrolysis with a multilevel porous support and abundant oxygen vacancies to boost efficiency and durability in water electrolysis. The formation of a heterointerface with abundant oxygen vacancies in IrO x improves the catalytic activity and prevents IrO x from peroxidation. Furthermore, the unique pore structure of the support facilitates the mass transport of the anode catalyst layer during water electrolysis at high current density, and the mass transport resistance of the water electrolyzer is only 0.0154 Ω cm 2 at 1.5 A cm −2 . When used in a PEMWE, the prepared electrocatalysts have an impressive electrochemical performance of 1.87 V at 3·A cm −2 with an Ir loading of only 0.91 mg cm −2 . This approach highlights the importance of oxygen vacancies and transportation in the catalyst-support interface, providing a promising solution for high-rate practical water electrolysis. Graphical
Efficient OER supported catalysts enriched with oxygen vacancies for PEMWE applications
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
DOI
高影响因子
ANALYTICAL SCIENCES
·
2024
·Vol. 40
·期 8
·1459-1473
·
IF 1.8
Xu Xin,Zhang Ze,Shen Tong,Pan Hongzhi,Chang Dong
The main reason for the high mortality rate of non-small cell lung cancer is that patients are usually diagnosed at an advanced stage of the disease. Exosomes, small membrane vesicles secreted by normal cells or tumor cells, play a significant role in the progression of NSCLC. This study successfully optimized the preparation of artificial nanoenzymes self-coupling with horseradish peroxidase (IrO 2 NPs@HRP-AptCD63), without adding any ligand, demonstrating remarkable catalytic activity suitable for detecting the EGFR protein on the surface of NSCLC exosomes. When fused with the CD63 aptamer for identifying NSCLC exosomes, IrO 2 NPs@HRP showed enhanced catalytic activity in the 3,3′,5,5′-tetramethylbenzidine-H 2 O 2 oxidation–reduction system, thereby enhancing the colorimetric signal. This phenomenon can be distinguished by the naked eye and quantified using a UV–Vis spectrophotometer. Meanwhile, as the redox reaction occurs, the current signal of 3,3′,5,5′-tetramethylbenzidine-H 2 O 2 , acting as an electrolyte, changes. The developed aptasensor generates dual-mode signal outputs, firstly, to visually assess the samples for their positive or negative status, and subsequently employ more in-depth electrochemical or colorimetric analysis methods for a detailed quantitative analysis of suspected positive samples. The detection limits of electrochemical analysis and colorimetric analysis were 0.9 × 10 3 particles/mL and 0.14 × 10 3 particles/mL, respectively. Compared with traditional biomarkers such as CA125, this method exhibits exceptional specificity, capable of simultaneously distinguishing serum exosomes of healthy volunteers, COPD patients, and NSCLC patients, promoting exosome detection in mouse models for tumor monitoring. Additionally, it elucidates the changes in EGFR protein expression on the surface of serum exosomes throughout the developmental trajectory. Graphical abstract
研究领域:
癌症生物学
·
纳米技术
·
生物传感器
·
分子诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2024
·
IF 2.6
Lin Tian,Yang Li,Huiqing Wang,Xinyi Li,Qian Gao,Yaru Liu,Yao Liu,Qing Wang,Cuiping Ma,Chao Shi
Vibrio parahaemolyticus ( V. parahaemolyticus ) is a major foodborne pathogen , which can cause serious foodborne illnesses like diarrhoea. Rapid on-site detection of foodborne pathogens is an ideal way to respond to foodborne illnesses. Herein, we provide an electrochemical sensor for rapid on-site detection. This sensor utilized a pH-sensitive metal-oxide material for the concurrent isothermal amplification and label-free detection of nucleic acids . Based on a pH-sensitive hydrated iridium oxide oxyhydroxide film (HIROF), the electrode transforms the hydrogen ion compound generated during nucleic acid amplification into potential, so as to achieve a real-time detection. The results can be transmitted to a smartphone via Bluetooth. Moreover, HIROF was applied in nucleic acid device detection, with a super-Nernst sensitivity of 77.6 mV/pH in the pH range of 6.0–8.5, and the sensitivity showed the best results so far. Detection of V. parahaemolyticus by this novel method showed a detection limit of 1.0 × 10 3 CFU/mL, while the time consumption was only 30 min, outperforming real-time fluorescence loop-mediated isothermal amplification (LAMP). Therefore, the characteristics of compact, portable, and fast make the sensor more widely used in on-site detection.
研究领域:
电化学
·
生物技术
·
食品安全
·
病原体检测
·
传感器
✓ 已验证
DOI
PubMed
高影响因子
Joule
·
2025
·
IF 35.4
Chenyang Wei,Cheng Liu,Zeyu Zhang,Kai Sun,Chengkun Xing,Wenjuan Shi,Youyong Li,Jian-Feng Li,Bo Zhang
Enhancing current density is a crucial strategy for reducing costs and improving the efficiency of green hydrogen production through water electrolysis. However, mass diffusion and proton transport limitations under high-current densities remain serious obstacles. Here, we proposed a novel strategy to construct a three-dimensional mesoporous skeleton structure of IrO 2 to address the limitations. By utilizing the dynamic loading of Ir nanoparticles during the La 2 O 3 template reconstruction process, high-density embedding of ultra-small Ir nanoparticles in the template is achieved. During the electrochemical process, in situ oxidation of Ir nanoparticles combined with template leaching results in the formation of a three-dimensional, mesoporous IrO 2 structure. The developed catalyst enables proton exchange membrane water electrolysis (PEMWE) to achieve stable operation for over 2,700 h at a current density of 5 A cm −2 with a voltage degradation rate of ∼0.38 μV h −1 , which meets the 2030 EU Clean Hydrogen JU target and 2026 US Department of Energy (DOE) target.
研究领域:
能源材料
·
电化学
·
纳米技术
·
催化
·
氢气生产
·
水分解
·
膜技术
✓ 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）