Extraordinary acidic oxygen evolution on new phase 3R-iridium oxide

Fan, Zhenglong; Ji, Yujin; Shao, Qun; Geng, Shize; Zhu, Wenxiang; Liu, Yang; Liao, Fan; Hu, Zhiwei; Chang, Yu‐Chung; Pao, Chih‐Wen; Li, Youyong; Kang, Zhenhui; Shao, Mingwang

doi:10.1016/j.joule.2021.10.002

Cited by 121 publications

(103 citation statements)

References 54 publications

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“…Ir-based materials in low dimensionality with new phase (like 1T, 2H, and 3R) are highly desirable due to high atom utilization, unique surface state, and increased phase stability with decreased layer thickness. [187,188] For example, the metallene 1T phase-iridium dioxide (IrO 2 ) demonstrates little degradation in a 126 h stability test at 250 mA cm geo −2 in PEM device with optimized Ir reaction site for *OH formation. The highly improved acidic OER performance is attributed to 1T phase IrO 2 with ultrathin 2D structures achieved by the robust mechanothermal synthetic strategy in a strong alkaline medium (Figure 8g-i).…”

Section: Ru/ir Based Oxidesmentioning

confidence: 99%

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Chen

Guo

Pan

et al. 2022

Advanced Energy Materials

163

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Section: Ru/ir Based Oxidesmentioning

confidence: 99%

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Chen

Guo

Pan

et al. 2022

Advanced Energy Materials

163

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“…For example, Fan et al developed a 3R-phase IrO 2 catalyst and found that the Ir vacancies promoted fast proton transportation along interlayers. [36] Such a catalyst modified by Ir vacancies had a low overpotential of 188 mV at a current density of 10 mA cm -2 , a low Tafel slope of 52 mV dec -1 , and a high TOF turnover frequency normalized by the mercury underpotential deposition (UPD) of 5.7 s UPD -1 at 1.50 V. A combination of anion and cation vacancies can also improve the intrinsic activity of catalysts. For example, Ru/Fe oxide nanoassemblies with abundant Fe and O vacancies had a low overpotential of 238 mV at a current density of 10 mA cm -2 and a low Tafel slope of 44.8 mV dec -1 .…”

Section: Vacancy Engineeringmentioning

confidence: 99%

“…developed a 3R‐phase IrO 2 catalyst and found that the Ir vacancies promoted fast proton transportation along interlayers. [ 36 ] Such a catalyst modified by Ir vacancies had a low overpotential of 188 mV at a current density of 10 mA cm –2 , a low Tafel slope of 52 mV dec –1 , and a high TOF turnover frequency normalized by the mercury underpotential deposition (UPD) of 5.7 s UPD –1 at 1.50 V.…”

Section: Acidic Oer Catalysts With High Intrinsic Activitymentioning

confidence: 99%

Low‐Dimensional Electrocatalysts for Acidic Oxygen Evolution: Intrinsic Activity, High Current Density Operation, and Long‐Term Stability

Liu

et al. 2022

Adv Funct Materials

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Water electrolysis can occur in alkaline, neutral, and acidic media. Neutral water electrolysis is environmentally friendly and suitable for microbial electrolysis, but is faced with problems of sluggish kinetics induced by the low concentration of adsorbed reactants on the catalyst surface and a large energy loss during the reaction. [4] In comparison, alkaline water electrolysis has a wider application due to the low cost and good stability of the catalysts but currently suffers from problems of a high ohmic resistance, sluggish kinetics, and a low current density. [5] Compared with neutral and alkaline water electrolysis, acidic water electrolysis such as a proton exchange membrane water electrolyzer (PEMWE) can reach a higher current density (>2 A cm -2 ) due to higher proton conductivity and lower ohmic resistance. In addition, PEMWE has the advantages of high purity H 2 production, a fast response speed and few side reactions. [6] In recent years, much effort has been devoted to acidic water electrolysis, but there are still several challenges for its large-scale applications. A major challenge is the poor performance at the anode, which requires high-performance catalysts to reduce the overpotential and improve the overall efficiency. [7] First, the intrinsic activity of acidic OER catalysts needs to be improved due to the sluggish four-electron-transfer kinetics of the OER compared with the two-electron-transfer hydrogen evolution reaction (HER), which needs to be improved. Second, most reported catalysts cannot reach high current density (>200 mA cm -2 ) and meet the requirements of industrial use. Third, the dissolution and peeling of the catalyst from the electrode in oxidative and corrosive OER conditions worsen their activity and stability, and thus limits the long-term use of these catalysts.OER occurs at the interface between a catalyst and an acidic electrolyte, where the absorption and desorption of the intermediates is crucial for the whole catalytic reaction. Therefore, it is important to control the absorption and desorption energy of intermediates to improve the overall reaction efficiency. [8] Low-dimensional materials including 0D (nanoparticles/ nanodots), 1D (nanorods/nanowires), and 2D (nanosheets/ nanoplates) have received much attention in the energy conversion field because of their high specific surface area, abundant active sites, tunable electronic structure, and possible different

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“…Successful examples include single-atom catalysts, 20,21 perovskites, [22][23][24][25] pyrochlores, 26 and other metal oxides. [27][28][29] Metal-organic frameworks (MOFs), a class of porous materials that are periodically assembled by metal ions/clusters and organic linkers via coordination bonding, 30 offer a perfect platform to meet the above requirement for the design of acidic OER catalysts. In fact, MOFs and their derivatives have attracted considerable research attention for versatile applications owing to their ultrahigh porosity, large surface area, tunable morphology, flexible structure, and synergy between metal centers and organic ligands.…”

Section: Introductionmentioning

confidence: 99%

Modulating metal–organic frameworks for catalyzing acidic oxygen evolution for proton exchange membrane water electrolysis

Sun

Jiang

et al. 2021

SusMat

120

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Proton exchange membrane (PEM) water electrolysis represents one of the most promising technologies to achieve green hydrogen production, but currently its practical viability is largely affected by the slow reaction kinetics of the anodic oxygen evolution reaction (OER) in an acidic environment. While noble metalbased catalysts containing iridium or ruthenium are excellent catalysts for the acidic OER, their practical use in PEM electrolyzers is hindered due to their low abundance and high cost. Most recently, metal-organic frameworks (MOFs) have been demonstrated as a perfect platform to facilitate the design of acidic OER catalysts with both high efficiency and cost-effectiveness. Here, we provide a timely and comprehensive overview of the recent progress on MOFbased acidic OER catalysts. The fundamental mechanisms of the acidic OER are first introduced, followed by a summary of the development of pristine MOFs and MOF derivatives as acidic OER catalysts. Importantly, a number of catalyst design strategies are discussed aiming at improving the acidic OER catalytic performance of MOF-based candidates. The integration of MOF-based catalysts into real PEM water electrolyzers is also included. Finally, future research directions are provided to achieve better MOF-based catalysts operational in acidic environments and PEM devices.

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Extraordinary acidic oxygen evolution on new phase 3R-iridium oxide

Cited by 121 publications

References 54 publications

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Advances in Oxygen Evolution Electrocatalysts for Proton Exchange Membrane Water Electrolyzers

Low‐Dimensional Electrocatalysts for Acidic Oxygen Evolution: Intrinsic Activity, High Current Density Operation, and Long‐Term Stability

Modulating metal–organic frameworks for catalyzing acidic oxygen evolution for proton exchange membrane water electrolysis

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