Improving the Activity for Oxygen Evolution Reaction by Tailoring Oxygen Defects in Double Perovskite Oxides

Zhu, Yunmin; Zhang, Lei; Zhao, Bote; Chen, Huijun; Liu, Xi; Zhao, Ran; Wang, Xinwei; Liu, Jiang; Chen, Yan; Liu, Meilin

doi:10.1002/adfm.201901783

Cited by 169 publications

(130 citation statements)

References 62 publications

(57 reference statements)

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“…Synthesis of PBSCF thin films with different orientations. By choosing appropriate single crystal substrates, epitaxial or highly textured oxide thin films with specific surface orientation can be efficiently grown by PLD techniques 25,[29][30][31] . For PBSCF, the X-ray diffraction (XRD) peaks of (110) and (102) planes overlap (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

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Tuning proton-coupled electron transfer by crystal orientation for efficient water oxidization on double perovskite oxides

et al. 2020

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Developing highly efficient and cost-effective oxygen evolution reaction (OER) electrocatalysts is critical for many energy devices. While regulating the proton-coupled electron transfer (PCET) process via introducing additive into the system has been reported effective in promoting OER activity, controlling the PCET process by tuning the intrinsic material properties remains a challenging task. In this work, we take double perovskite oxide PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) as a model system to demonstrate enhancing OER activity through the promotion of PCET by tuning the crystal orientation and correlated proton diffusion. OER kinetics on PBSCF thin films with (100), (110), and (111) orientation, deposited on single crystal LaAlO 3 substrates, were investigated using electrochemical measurements, density functional theory (DFT) calculations, and synchrotron-based near ambient X-ray photoelectron spectroscopy. The results clearly show that the OER activity and the ease of deprotonation depend on orientation and follow the order of (100) > (110) > (111). Correlated with OER activity, proton diffusion is found to be the fastest in the (100) film, followed by (110) and (111) films. Our results point out a way of boosting PCET and OER activity, which can also be successfully applied to a wide range of crucial applications in green energy and environment.

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Section: Resultsmentioning

confidence: 99%

“…1a) grown on a inert Yttrium stabilized ZrO2 (YSZ) (100) single crystal substrate are depicted in Fig. 1d, which shows only substrate peaks in the 2θ-ω scans 28,29 . Fig.…”

Section: Resultsmentioning

confidence: 99%

Tuning proton-coupled electron transfer by crystal orientation for efficient water oxidization on double perovskite oxides

et al. 2020

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“…This also provides easier control of the reaction kinetics during the synthesis process [40]. However, under excessive reduction of annealing conditions, aggregation of the perovskite oxide nanostructures could occur, leading to a collapsed structure and degraded OER activity [51].…”

Section: Reductionmentioning

confidence: 99%

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

2020

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Oxygen vacancies in complex metal oxides and specifically in perovskites are demonstrated to significantly enhance their electrocatalytic activities due to facilitating a degree of control in the material’s intrinsic properties. The reported enhancement in intrinsic OER activity of oxygen-deficient perovskites surfaces has inspired their fabrication via a myriad of schemes. Oxygen vacancies in perovskites are amongst the most favorable anionic or Schottky defects to be induced due to their low formation energies. This review discusses recent efforts for inducing oxygen vacancies in a multitude of perovskites, including facile and environmentally benign synthesis strategies, characterization techniques, and detailed insight into the intrinsic mechanistic modulation of perovskite electrocatalysts. Experimental, analytical, and computational techniques dedicated to the understanding of the improvement of OER activities upon oxygen vacancy induction are summarized in this work. The identification and utilization of intrinsic activity descriptors for the modulation of configurational structure, improvement in bulk charge transport, and favorable inflection of the electronic structure are also discussed. It is our foresight that the approaches, challenges, and prospects discussed herein will aid researchers in rationally designing highly active and stable perovskites that can outperform noble metal-based OER electrocatalysts.

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“…[6,7] Second, the detailed mechanism of defects formation has not been completely elucidated yet, and that has significantly hindered the rational design of efficient electrocatalysts. [8] Thus, the development of pH-universal catalysts is extremely important for practical application yet challenging.…”

Section: Introductionmentioning

confidence: 99%

Selective Surface Reconstruction of a Defective Iridium‐Based Catalyst for High‐Efficiency Water Splitting

et al. 2020

Adv Funct Materials

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Development of robust catalysts for electrochemical water splitting is a critical topic for the energy conversion field. Herein, a precise electrochemical reconstruction of IrTe 2 hollow nanoshuttles (HNSs) is performed for oxygen and hydrogen evolution reactions (OER and HER), the two half reactions of water splitting. It is determined that the reconstruction of IrTe 2 HNSs can be regulated by adjusting the potential during electrochemical dealloying, in which mild and high potentials lead to the formation of IrTe 2 HNSs with metal Ir shell (D-IrTe 2 HNSs) and IrO x surface (DO-IrTe 2 HNSs), respectively. Detailed analyses reveal that such electrochemical reconstruction has produced abundant defects in D-IrTe 2 and DO-IrTe 2 HNSs. As a result of this, D-IrTe 2 HNSs present a very low HER overpotential of 54 mV at a current density of 10 mA cm −2 in 1.0 m KOH. Moreover, the turnover frequency of DO-IrTe 2 HNSs is 0.36 O 2 s −1 at an OER overpotential of 250 mV in 0.5 m H 2 SO 4 , outperforming the most of reported Ir-based catalysts. Furthermore, the D-IrTe 2 ||DO-IrTe 2 couple exhibits promising activity for the overall water splitting in both 1.0 m KOH and 0.5 m H 2 SO 4. This study promotes the fundamental research for the design of efficient catalysts via surface engineering.

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Improving the Activity for Oxygen Evolution Reaction by Tailoring Oxygen Defects in Double Perovskite Oxides

Cited by 169 publications

References 62 publications

Tuning proton-coupled electron transfer by crystal orientation for efficient water oxidization on double perovskite oxides

Tuning proton-coupled electron transfer by crystal orientation for efficient water oxidization on double perovskite oxides

Oxygen-deficient perovskites for oxygen evolution reaction in alkaline media: a review

Selective Surface Reconstruction of a Defective Iridium‐Based Catalyst for High‐Efficiency Water Splitting

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