Improving the Electrocatalytic Activity and Durability of the La0.6Sr0.4Co0.2Fe0.8O3−δ Cathode by Surface Modification

Chen, Huijun; Guo, Zheng; Zhang, Lei A.; Li, Yifeng; Li, Fēi; Zhang, Yapeng; Chen, Yu; Wang, Xinwei; Yu, Bo; Shi, Jianmin; Liu, Jiang; Yang, Chenghao; Cheng, Shuang; Chen, Yan; Liu, Meilin

doi:10.1021/acsami.8b14693

Cited by 74 publications

(83 citation statements)

References 60 publications

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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%

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%

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

et al. 2020

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“…PBSCF was selected as the model material because of its good electro‐catalytic activity and the capability to accommodate a large amount of oxygen vacancies without changing the crystal structure . The use of thin film model system with well‐defined structure can avoid the complication arising from the changes in microstructure, which are often observed in porous oxide catalysts 5b,16. Electrochemical measurement showed that the OER performance of the PBSCF thin films was noticeably improved after introducing oxygen vacancies via thermal annealing in a H 2 atmosphere and electrochemical reduction.…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Zhang

Zhao

et al. 2019

Adv Funct Materials

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Developing low-cost, high-performance electro-catalysts is essential for large-scale application of electrochemical energy devices. In this article, reported are the findings in understanding and controlling oxygen defects in PrBa 0.5 Sr 0.5 Co 1.5 Fe 0.5 O 5+δ (PBSCF) for significantly enhancing the rate of oxygen evolution reaction (OER) are reported. Utilizing surface-sensitive characterization techniques and first-principle calculations, it is found that excessive oxygen vacancies promote OH − affiliation and lower the theoretical energy for the formation of O* on the surface, thus greatly facilitating the OER kinetics. On the other hand, however, oxygen vacancies also increase the energy band gap and lower the O 2p band center of PBSCF, which may hinder OER kinetics. Still, careful tuning of these competing effects has resulted in enhanced OER activity for PBSCF with oxygen defects. This work also demonstrates that oxygen defects generated by different techniques have very different characteristics, resulting in different impacts on the activity of electrodes. In particular, PBSCF nanotubes after electrochemical reduction exhibit outstanding OER activity compared with the recently reported perovskite-based catalysts.

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“…The exponent m can provide information about the rate‐limiting step for ORR kinetic. The reaction steps with the noticeable changes of corresponding exponent m can be described as follows

{normalO}_{2, gas} \leftrightarrow {normalO}_{2, ads}; m = 1

{normalO}_{2, ads} \leftrightarrow 2 {normalO}_{ads}; m = 0.5

{normalO}_{2, ads} + 4 {normale}^{-} + 2 V_{oxy}^{''} \leftrightarrow 2 O_{oxy}^{x}; m = 0.25

…”

Section: Resultsmentioning

confidence: 99%

Intrinsic Effects of Ruddlesden‐Popper‐Based Bifunctional Catalysts for High‐Temperature Oxygen Reduction and Evolution

Huan

Chen

Zeng

et al. 2019

Advanced Energy Materials

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Unveiling the intrinsic effects of Ruddlesden‐Popper (RP) series An+1BnO3n+1 (A = La, B = Ni, Co, Mn, Cu, n = 1, 2 and 3) catalysts is essential in order to optimize the activity of oxygen reduction reaction (ORR) and evolution reaction (OER). Here, it is demonstrated that the oxygen vacancy is not the key point for RP to realize high ORR and OER activity at high temperature. Instead, interstitial O2− with high concentration and fast migration, and lattice oxygen with high activity are favorable for the high‐temperature catalytic activity. Aliovalent cation doping is an effective strategy to modify the catalytic activity. For the RP catalysts, low‐valence ion doping does not introduce oxygen vacancies, which suppresses the activity of lattice oxygen and decreases the interstitial O2− concentration; whereas high‐valence ion doping enhances the interstitial O2– concentration and the lattice oxygen activity. The evaluations of six RP series (La2NiO4, La2CoO4, La3Co2O7, La4Ni3O10, La2MnO4, and La2CuO4 based) and twenty samples as oxygen electrodes for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) demonstrate that this finding is applicable to all the selected RP series.

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Improving the Electrocatalytic Activity and Durability of the La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Cathode by Surface Modification

Cited by 74 publications

References 60 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

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

Intrinsic Effects of Ruddlesden‐Popper‐Based Bifunctional Catalysts for High‐Temperature Oxygen Reduction and Evolution

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