Boosting oxygen evolution reaction by enhanced intrinsic activity in Ruddlesden−Popper iridate oxides

Zhu, Chuanhui; Tian, Hao; Huang, Bin; Cai, Guohong; Yuan, Chongyang; Zhang, Yutian; Xu, Hu; Li, Man-Rong

doi:10.1016/j.cej.2021.130185

Cited by 15 publications

(13 citation statements)

References 58 publications

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“…In fact, the electrocatalytic activity (evaluated by the geometric current density) of H-γ-SIO-1 outperforms all previously reported iridates-derived electrocatalysts, mainly including those with perovskite, pyrochlore, fluorite, and P2-layered structures (see some representative examples in Table S5, Supporting Information). [15,17,22,23,26,27,[36][37][38][39][40][41][42][43] We further calculate the iridium mass activity (j Ir ) of H-γ-SIO-1 through normalizing the measured current with respect to the mass of iridium. The H-γ-SIO-1 gives a current density of 466 A g −1 at 1.5 V, which is 45 times greater than that of IrO 2 (10.3 A g −1 ).…”

Section: Resultsmentioning

confidence: 99%

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

et al. 2023

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active phase thanks to potential-driven redox reactions and/or corrosive electrolyte-induced component change. This reconstruction phenomenon is widely observed in electrocatalysts, ranging from metals and alloys [11][12][13] to (hydr)oxides [14][15][16][17][18] and non-oxides (e.g., chalcogenides and borides). [19][20][21] It has become a common understanding that the primitive structure of pre-electrocatalyst is not the same as that in the final active phase, [14][15][16] but it is necessarily to determine reconstruction process and the outcome during electrocatalysis. Therefore, understanding structural transformation of electrocatalysts and revealing initial structure-active phase relationship have been attractive issues. And moreover, designing suitable preelectrocatalysts to produce high-performance catalytic active phases is far from straightforward due to the complexity and unpredictability of electrochemical reconstruction process.One of the most prominent examples is the perovskite-type strontium iridate (i.e., SrIrO 3 ), a pre-electrocatalyst that in situ forms amorphous IrO x H y active phase with excellent electrocatalytic activity in acid for the oxygen evolution reaction (OER). [14] Inspired by this pioneering work, a number of perovskite-type iridates with a variety of crystal structures and compositions have been explored as oxygen evolution (pre)electrocatalysts. [14][15][16] In addition, some non-perovskite iridates, including pyrochlore, fluorite, and P2-layered structures, have also been studied recently. [22][23][24][25] These iridates, like perovskite SrIrO 3 , also generate amorphous IrO x H y active phases during OER in acid, although local microstructures of these amorphous active phases may be quite different and strongly dependent on the crystal structures and defects of initial iridates as well as their preparation history. The recently developed iridates-derived electrocatalysts with amorphous active phases generally exhibit more than ten times higher activity, yet worse structural stability (or more serious iridium leaching) than crystalline IrO 2 nanocatalyst. And the majority of them only retain the high catalytic activity for less than 50 h under electrocatalysis conditions. Hence, it would be desirable to explore new iridate (pre-)electrocatalysts that can evade the crystalline-to-amorphous phase transformation in traditional ones, and thereby realize the simultaneous improvement of catalytic activity and lifetime.Herein, we report, for the first time, the phase-selective synthesis of a metastable, open-framework strontium iridate The acidic oxygen evolution reaction underpins several important electricalto-chemical energy conversions, and this energy-intensive process relies industrially on iridium-based electrocatalysts. Here, phase-selective synthesis of metastable strontium iridates with open-framework structure and their unexpected transformation into a highly active, ultrastable oxygen evolution nano-electrocatalyst are presented. This transformation involves two major ste...

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Section: Resultsmentioning

confidence: 99%

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

et al. 2023

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“…It is highly conducive to the OER process as the elevated intrinsic conductivity would promote fast charge transport. 51 Therefore, the introduction of anion defects to adjust the active site and optimize the electronic structure is conducive to the improvement of OER activity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Compared with SLCO, SLCOCl 0.15 exhibits an increase in DOS crossing the Fermi level, demonstrating a potential for high electrical conductivity. It is highly conducive to the OER process as the elevated intrinsic conductivity would promote fast charge transport . Therefore, the introduction of anion defects to adjust the active site and optimize the electronic structure is conducive to the improvement of OER activity.…”

Section: Resultsmentioning

confidence: 99%

Regulating the Electronic Structure of Ruddlesden–Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

Zhang

et al. 2023

Inorg. Chem.

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Developing economical, efficient, and durable oxygen evolution catalysts is crucial for achieving sustainable energy conversion and storage. Ruddlesden–Popper-type perovskite oxides are at the forefront of oxygen evolution reaction (OER) research. However, their activity and stability are far from satisfactory. Therefore, we emphasize the paradigm shift in designing efficient perovskite-type OER catalysts through anion defect engineering. The Cl anion-doped A2BO4-type perovskite oxides, SrLaCoO4–x Cl x (SLCOCl x ), were employed as highly efficient OER catalysts, wherein Cl could tune the electronic structure of SrLaCoO4 (SLCO) to enhance the OER activity effectively. Especially, SLCOCl0.15 demonstrates significantly enhanced OER activity, and the overpotential is only 370 mV at 10 mA·cm–2, which is significantly better than that of SLCO (510 mV). As confirmed by experience results and density functional theory (DFT) calculation, due to the doping of Cl, obviously increasing the ratio of Co2+/Co3+, more abundant oxygen vacancies (O2 2–/O–) are generated, and the electrical conductivity is increased, which together promote the improvement of OER activity.

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“…The insertion of rock-salt AO-layers in Ruddlesden-Popper (RP) perovskite not only induces interlayer interaction to stabilize the crystal structure, but also optimizes the electrical properties of the active B-site. [23][24][25][26] This paper describes the design and synthesis of twodimensional layered Sr 2 SnO 4 with a RP structure for the selective conversion of CO 2 to HCOO À . Compared with the SnO 2 and SrSnO 3 samples, Sr 2 SnO 4 shows enhanced selectivity with the Faradaic Efficiency (FE) for HCOO À reaching 83.7% (À1.08 V vs. the reversible hydrogen electrode).…”

Section: Introductionmentioning

confidence: 99%

“…The insertion of rock-salt AO-layers in Ruddlesden–Popper (RP) perovskite not only induces interlayer interaction to stabilize the crystal structure, but also optimizes the electrical properties of the active B-site. 23–26…”

Section: Introductionmentioning

confidence: 99%

SrO-layer insertion in Ruddlesden–Popper Sn-based perovskite enables efficient CO₂ electroreduction towards formate

Zhao

Zhang

et al. 2022

Chem. Sci.

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Boosting oxygen evolution reaction by enhanced intrinsic activity in Ruddlesden−Popper iridate oxides

Cited by 15 publications

References 58 publications

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

Regulating the Electronic Structure of Ruddlesden–Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

SrO-layer insertion in Ruddlesden–Popper Sn-based perovskite enables efficient CO₂ electroreduction towards formate

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Boosting oxygen evolution reaction by enhanced intrinsic activity in Ruddlesden−Popper iridate oxides

Cited by 15 publications

References 58 publications

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

A Highly Active, Long‐Lived Oxygen Evolution Electrocatalyst Derived from Open‐Framework Iridates

Regulating the Electronic Structure of Ruddlesden–Popper-Type Perovskite by Chlorine Doping for Enhanced Oxygen Evolution Activity

SrO-layer insertion in Ruddlesden–Popper Sn-based perovskite enables efficient CO2 electroreduction towards formate

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SrO-layer insertion in Ruddlesden–Popper Sn-based perovskite enables efficient CO₂ electroreduction towards formate