Oxygen-deficient BaTiO3− perovskite as an efficient bifunctional oxygen electrocatalyst

Chen, Ching‐Fong; King, Graham; Dickerson, Robert M.; Papin, Pallas A.; Gupta, Shiva; Kellogg, William; Wu, Gang

doi:10.1016/j.nanoen.2015.03.005

Cited by 229 publications

(172 citation statements)

References 51 publications

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“…They found that OVs-containing BaTiO 3−x exhibits higher activity and stability than the pristine one. [43] Precisely tailoring of OVs on the desired facets of metal oxide can further greatly influence the surface electronic structure metal oxide, which is beneficial to enhance the corresponding intrinsic activity for ORR/OER. For example, Qiao et al recently reported the surface structure engineering of single-crystal (SC) CoO nanorods (NRs) by the introduction of desired facets and OVs (Figure 5a).…”

Section: Defect Engineeringmentioning

confidence: 99%

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Huang

Wang

Peng

et al. 2017

Advanced Energy Materials

709

448

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Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the two most important reactions in rechargeable metal‐air battery, a promising technology to meet the energy requirements for various applications. The development of low‐cost, highly efficient and stable bifunctional ORR/OER catalysts is critical for a large‐scale application of this technology. In this review, the authors first introduce the fundamentals of bifunctional ORR/OER electrocatalysis in alkaline electrolyte. Various types of nanostructured materials as bifunctional ORR/OER catalysts including metal oxide, hydroxide and sulfide, functional carbon material, metal, and their composites are then reviewed. The crucial factors that can be used to tune the activity of the catalyst towards ORR/OER are summarized, including (1) phase, morphology, crystal facet, defect, mixed‐metal and strain engineering for metal oxide; (2) heteroatom doping, topological defects, and formation of metal‐N‐C structure for carbon material; (3) alloy effect for metal. These experiences lay the foundation for large scale application of metal‐air battery and can also effectively guide the rational design of catalysts for other electrocatalytic reactions.

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Section: Defect Engineeringmentioning

confidence: 99%

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Huang

Wang

Peng

et al. 2017

Advanced Energy Materials

709

448

View full text Add to dashboard Cite

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“…The resultant product displays fluffy morphology featured with many large pores of several ten nanometers in size, presenting that an arbon from sweet morphology and microstructure as well as the elemental transmission electron microscopy (HRTEM), , XRD, and Raman measurements were detailedly performed. HRTEM image ( Figure 1B) manifests disordered and highly bent graphitic layers, which are typical of doped carbon materials with various defects [36][37][38]. These defects are believed to facilitate chemisorption of reactants at the sterically less hindered active sites and eventually benefit catalytic activity [39].…”

Section: Structural Characterizationsmentioning

confidence: 99%

Recycling the biowaste to produce nitrogen and sulfur self-doped porous carbon as an efficient catalyst for oxygen reduction reaction

et al. 2015

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“…Chen group reported that, as MnO 2 undergoes heat-treatment in argon atmosphere, a pyrolusite lattice of oxygen-vacancy-induced structure was formed on the surface of MnO 2 , and both ORR and OER electro catalytic activities were enhanced signifi cantly. [ 16,19 ] When (La,Sr) 0.5 (Mn,Co) 0.5 O 3−δ was heat-treated at 150 °C under a vacuum condition, oxygen vacancy-enriched surface was formed as an active site upon perovskite oxides, enhancing oxidizing electrocatalytic process on the organic substrates. [ 20 ] Wu et al demonstrated that the heat-treatment of La 0.6 Ca 0.4 CoO 3−δ above 300 °C in oxygen atmosphere decreased both the ORR and OER catalytic activities concurrently.…”

Section: Introductionmentioning

confidence: 99%

Tunable Internal and Surface Structures of the Bifunctional Oxygen Perovskite Catalysts

Jung

Park

Kim

et al. 2015

Advanced Energy Materials

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candidates, whose performance is nearly identical to IrO 2 at a catalytic activity. [ 5 ] Any transition-metal-oxide perovskite that has an e g -fi lling (σ * -orbital occupation) close to 1 shows the maximum ORR activity, on the base that the B-site transition-metal-oxygen covalency between metal-3d and oxygen-2p works as a criterion in determining catalytic activity. [ 2,6 ] As a mixed electronic-and ionic-conductor (MEIC), Ba 0.5 Sr 0.5 Co x Fe 1− x O 3−δ (BSCF) is a well-known perovskite material that keeps a wide range of oxygen stoichiometry (3-δ) under different conditions such as temperature, oxygen partial pressures (pO 2 ), and B-site cation ratio (Co/Fe). [ 7,8 ] The structural/chemical fl exibilities and high oxygen nonstoichiometry (δ), while maintaining the cubic symmetry of crystal structure, enables it to be applied as a bifunctional oxide electrocatalyst in diverse renewable energy fi elds, e.g., metal-air batteries, oxygen membrane, and solid oxide fuel cell (SOFC). [9][10][11][12][13] Upon the base of the fl exible nonstoichiometry in the perovskite structure, a single chemical composition perovskite can be facilely modifi ed to meet the required criterion of the OER and ORR catalytic performance. This, in turn, implies that even a good OER/ORR perovskite catalyst can be digressed into a poor catalyst via internal changes of oxygen vacancy concentration, mixed valence state of each transition metal ion, etc., and vice versa. As for the ORR catalytic performance, which is in general evaluated by ORR activity as "on-set potential" that signifi es the facile rate of reaction initiation in the beginning of electrochemical activities, [ 5,6 ] though, the peroxide formation rate (HO 2 − %), limiting kinetic current ( i d ) and electron transfer number ( n ) also should be counted. [ 4,[14][15][16] They contribute signifi cantly to transport limiting current which occurs at the three phase boundaries (gas, solid catalyst, and liquid electrolyte) during the ORR process of the full-cell test. In this study, we focus on how the limiting kinetic currents ( i d ) of the electrochemical performance are affected by the changes of internal and surface structures in BSCF series catalysts.When the defect chemistry of BSCF series is manipulated by monitoring oxygen nonstoichiometry (δ), not only the valence of B-site cation and unit cell volume expansion change, [ 7,8,17 ] but also the surface morphology and chemistry are expected to vary under different heat treatment conditions. [ 8,14,18 ] Particularly, optimizing surface structure via engineering the defect Perovskite oxide ceramics attracts signifi cant attention as a strong candidate of bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalyst for the metal-air batteries. Numerous approaches to the viability of bifunctional perovskite electrocatalyst represent that the electrochemical performance is highly correlated with defect chemistry, surface structure, and overall polycrystalline perovskite structure. By making ...

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Oxygen-deficient BaTiO3− perovskite as an efficient bifunctional oxygen electrocatalyst

Cited by 229 publications

References 51 publications

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Design of Efficient Bifunctional Oxygen Reduction/Evolution Electrocatalyst: Recent Advances and Perspectives

Recycling the biowaste to produce nitrogen and sulfur self-doped porous carbon as an efficient catalyst for oxygen reduction reaction

Tunable Internal and Surface Structures of the Bifunctional Oxygen Perovskite Catalysts

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