JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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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
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电化学
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DOI
高影响因子
ADVANCED MATERIALS
·
2015
·Vol. 27
·期 44
·7150-7155
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IF 17.493
Zhu Y,Zhou W,Chen Y,Yu J,Liu M,Shao Z.
Layered LiCo0.8 Fe0.2 O2 demonstrates dramatically enhanced oxygen evolution reaction (OER) activity and durability in an alkaline solution over LiCoO2 and other reported state-of-the-art catalysts, including benchmark IrO2 . This superior performance is attributed to Fe-doping-induced synergistic effects.
研究领域:
电化学
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材料科学
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催化
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能源材料
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·5841-5851
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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
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纳米材料
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能源化学
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催化化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Lin Zhu,Cheng-long Ma,Li-mei Cao,Ji Yang
Here, two iridium-based crystal structures, K0.3IrO2·xH2O and Rb0.3IrO2·xH2O, have been synthesized for application in the oxygen evolution reaction (OER). The 3R-type layered IrO2 structures with different lattice parameters were successfully obtained from the two Ir structures by the hydrogen ion exchange method. According to synchrotron radiation spectra and the theoretical calculation of density functional theory (DFT), the increase of oxygen vacancy concentration caused by lattice distortion in the 3R-IrO2 crystal is negatively correlated with the activity of OER. A high concentration of oxygen vacancies will reduce Ir–O hybridization, which is not conducive to the balance between the adsorption and desorption of intermediate products. The higher OH adsorption energy barrier and band gap of the 3R-IrO2 crystal limited the improvement of electrochemical performance. In addition, through the analysis of the bonding orbitals and antibonding orbitals of the two structures, we concluded that 3R-IrO2 belongs to the nonthermodynamically stable structure and is not suitable for hydrogen production by electrolysis of water.
研究领域:
材料科学
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理论化学
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产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 12
·1456
·
IF 3.9
Xin Teng,Junan Gao,Zuobo Yang,Xin Liang,Xiaokuan Wu,Jimmy Yun,Jie Zhang
Proton exchange membrane (PEM) water electrolysis for hydrogen production has a high current density and overall efficiency, and is a very promising hydrogen production strategy. However, its application is limited by the high anodic overpotential for oxygen evolution and the instability of catalysts. Therefore, anodic catalysts with a high activity and durability under acidic conditions need further research. Herein, we first synthesized the key intermediate Ru@Ir core-shell structures by controlling nanocrystals, then loaded them onto a carbon support and calcined to obtain a RuO2@IrO2/C core-shell nanocatalyst with a size smaller than 5 nm, whose activity exceeded that of commercial RuO2and commercial IrO2. After a 200 h stability test, the catalyst did not show significant performance degradation or structural degeneration. Finally, the prepared catalyst was assembled into a PEM electrolyzer showing the same results as the three-electrode tests, demonstrating its potential for practical applications and providing new insights for designing nanocatalysts suitable for industrialized PEM water electrolysis to produce hydrogenKeywords:PEM;OER;core-shell;structure;IrO2@RuO2/C
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高影响因子
Sustainable Energy & Fuels
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2020
·Vol. 4
·期 5
·2462-2468
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IF 5.503
Chao Cai,Shaobo Han,Yongliang Tang
Here we report IrO2 with dendrite-like nanostructures (DLNs) as a catalyst for the oxygen evolution reaction (OER) in acidic solution. The IrO2 DLNs are prepared by the molten salt method and have self-standing three dimensional structures. IrO2 with DLNs has a high mass activity determined to be 19-fold that of commercial IrO2. Combining a wide array of ex situ characterization methods, we demonstrate that the sublayer Ir cations and lattice O participate in the OER. The Ir corrosion and O/OH− adsorption during the OER can lead to IrO2 surface reconstruction, from a compressed one to a stretched one.
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
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 9
·2268-2275
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IF 5.106
Nan Wang,Xinjun Li
A novel photocatalyst with protonated carbon nitride (p-C3N4) loaded with IrO2 quantum dots (QDs) was fabricated via a facile hydrothermal method. Structure characterization studies (XRD, STEM, XPS, UV–vis spectra and PL spectra) revealed that the IrO2 QDs with an average diameter of ca. 2 nm were highly dispersed and anchored to the surfaces of p-C3N4. The introduced IrO2 QDs promoted the electron–hole separation efficiency of p-C3N4 and increased the absorbance capacity within the visible light range. The photocatalytic activity was evaluated using hydrogen and oxygen evolution from water splitting under visible light illumination. The optimum IrO2/C3N4-0.6 wt% photocatalyst exhibits the highest hydrogen evolution rate of 45 μmol h−1 and oxygen production rate of 20 μmol h−1. Under visible light irradiation, the composite photocatalyst shows higher photocurrents, more negative onset potential and lower photoluminescence intensity compared with those of p-C3N4, which demonstrated that the modification of IrO2 QDs accelerated the transformation, separation, and utilization of photoelectrons and thereby significantly improved the photocatalytic performance.
研究领域:
光催化化学
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纳米材料科学
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能源转化技术
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DOI
高影响因子
Journal of the American Chemical Society
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2024
·
IF 14.4
Hao Yu,Yujin Ji,Chenchen Li,Wenxiang Zhu,Yue Wang,Zhiwei Hu,Jing Zhou,Chih-Wen Pao,Wei-Hsiang Huang,Youyong Li,Xiaoqing Huang,Qi Shao
A strain engineering strategy is crucial for designing a high-performance catalyst. However, how to control the strain in metastable phase two-dimensional (2D) materials is technically challenging due to their nanoscale sizes. Here, we report that cerium dioxide (CeO2) is an ideal loading material for tuning the in-plane strain in 2D metastable 1T-phase IrO2 (1T-IrO2) via an in situ growth method. Surprisingly, 5% CeO2 loaded 1T-IrO2 with 8% compressive strain achieves an overpotential of 194 mV at 10 mA cm–2 in a three-electrode system. It also retained a high current density of 900 mA cm–2 at a cell voltage of 1.8 V for a 400 h stability test in the proton-exchange membrane device. More importantly, the Fourier transform infrared measurements and density functional theory calculation reveal that the CeO2 induced strained 1T-IrO2 directly undergo the *O–*O radical coupling mechanism for O2 generation, totally different from the traditional adsorbate evolution mechanism in pure 1T-IrO2. These findings illustrate the important role of strain engineering in paving up an optimal catalytic pathway in order to achieve robust electrochemical performance.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Ye Xie,Yuanfu Deng,Chunxiang Yang,Zhenou Zeng,Yingwei Li,Guohua Chen
Preparation of highly efficient and inexpensive electrodes for oxygen evolution reaction (OER) is of significant importance in the development of water splitting for hydrogen production . Ternary IrO 2 -Sb 2 O 5 -SnO 2 and cobalt-based oxides have been suggested to be high stability and low cost electrocatalysts for OER in acid and basic aqueous solution, respectively. Herein, we develop a serial of Ti/CoO x -IrO 2 -Sb 2 O 5 -SnO 2 anodes by a simple thermal treatment of mixed metal chlorides on Ti substrate. It is found that the partial-substitution iridium by cobalt in Ti/Ir 0.1 Sb 0.1 Sn 0.8 O x (Ti/C 0 ISS) anode shows an improved OER activity in acid and basic solution. For a Ti/Ir 0.05 Co 0.05 Sb 0.1 Sn 0.8 O x (Ti/C 5 ISS) anode, small overpotentials of 0.438 and 0.498 V are needed under the current densities of 10 and 100 mA cm −2 in 0.5 M KOH, respectively. These values are remarkably lower than those of Ti/C 0 ISS electrode and comparable to other nanometer metal oxides catalysts. Additionally, it exhibits a low Tafel slope of 55 mV dec −1 and displays excellent electrocatalytic durability for OER in alkaline solution under a high current density . These advantages indicate Ti/C 5 ISS is a promising anode for water oxidation under high current densities.
研究领域:
电化学
·
材料科学
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催化
·
能量存储与转换
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yibo Wang,Shuai Hou,Rongpeng Ma,Jiadong Jiang,Zhaoping Shi,Changpeng Liu,Junjie Ge,Wei Xing
Simultaneously improving the activity and long-term stability of the oxygen evolution electrocatalysts in acidic media is an ever ongoing process for the water electrolysis technique. Here, we report a novel Gd-doped porous IrO2 (Gd-pIrO2) catalyst with a high specific surface at 293 m2 g–1 and enhanced catalytic activity toward oxygen evolution reaction (OER), where the overpotential required to reach 10 mA cm–2 is only 287 mV. We found that Gd3+ doping induces the formation of abundant oxygen vacancies and an increase in Ir4+/Ir3+ ratio, due to the charge compensating mechanism in defect chemistry. Combining experimental techniques and density functional theory calculations, we revealed that Gd doping at an appropriate content leads to an overall enhancement in OER performance, where oxygen vacancies facilitate the adsorption of water molecules and the high ratio of Ir4+/Ir3+ facilitates the H dissociation. The novel strategy proposed in this study provides an efficient way for designing high-performance electrocatalysts for water electrolysis.
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
CRYSTENGCOMM
·
2023
·
IF 3.1
Zhen Fang,Zhongmin Tang,Senming Lin,Runhua Li,Xiaomei Cheng,Jiakang Tian,Lijiang Liu,Jiaheng Peng,Shuai Liu,Benwei Fu,Jianbo Wu,Tao Deng
The slow kinetic process of oxygen evolution reaction (OER) and poor electrochemical stability in acidic environments of electrocatalysts seriously restrict the efficiency of hydrogen production from proton exchange membrane water electrolyzers (PEMWE). In recent years, developing corrosion-resistant and redox-active doped TiO2 with heterogeneous atoms has become an effective strategy to address this challenge. However, most of the reported works only explore the single-element doped TiO2-supported catalyst, and there are few reports comparing the doping effects of various elements at the experimental level, which is crucial for screening high-performance OER electrocatalysts. In this work, seven different metal elements M (M=V, Mn, Fe, Ni, Cu, Nb, W) are selected to doping anatase TiO2 with the same molar ratio (M/Ti) and combined with IrO2 nanoparticles to form M-doped TiO2-supported IrO2 (M-TiO2@IrO2) electrocatalysts. Electrochemical OER activity and stability results indicate that W-TiO2@IrO2 exhibits the best performance among all these catalysts in terms of comprehensively regulating the conductivity of TiO2 and the activity and stability of IrOx within the range of experimental design in this work, which possibly origins from the appropriate energy band structure obtained through W doping, optimizing the intrinsic conductivity of support and interfacial electronic structure between metal oxide and support.
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DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Shumei Li,Yang Xu,Ke Liang,Xiongwei Qu,Zhaochi Feng,Yu Qi,Beibei Dong
Photocatalytic H 2 O 2 production still confronts the challenges of its dependence on organic electron donors or high-purity O 2 , which restricts the practical application, and there are few studies on the photosynthesis of H 2 O 2 via both oxygen reduction reaction (ORR) and water oxidation reaction (WOR). In this paper, bismuth yttrium oxyhalides Bi 2 YO 4 X (X = Cl, Br, or I) are demonstrated to afford sufficient driving forces to produce H 2 O 2 in the absence of sacrificial reagents. After modification with Pt and IrO 2 as cocatalysts, which can selectively promote both ORR and WOR reactions on Bi 2 YO 4 Cl, the IrO 2 -Pt/Bi 2 YO 4 Cl sample yields H 2 O 2 production activity of 647 µmol L −1 h −1 with negligible decay in the long-term reaction using only H 2 O and an air atmosphere as the electron donors and O 2 source. Detailed characterizations reveal that the ORR reaction obeys a two-electron pathway. We present the first example of oxyhalides (Bi 2 YO 4 X) capable of efficient photocatalytic H 2 O 2 generation with record-breaking activity.
研究领域:
材料科学
·
环境化学
·
光催化
·
无机化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）