A-site deficient perovskite nanofibers boost oxygen evolution reaction for zinc-air batteries

Wu, Xuyang; Miao, He; Hu, Ruigan; Chen, Bin; Yin, Mingming; Zhang, Houcheng; Xia, Lan; Zhang, Chunfei; Yuan, Jinliang

doi:10.1016/j.apsusc.2020.147806

Cited by 49 publications

(19 citation statements)

References 45 publications

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“…The onset overpotential and overpotential at 10 mA

{cm}^{- 2}_{disk}

of ultrathin o‐LMONs were further compared to the most advanced perovskite catalysts reported recently (Figure 3d,e, and Table S3, Supporting Information). [ 20–22,26,28,30–52 ] The corresponding turnover frequency (TOF) of o‐LMONs at 1.59 V versus RHE is remarkably larger than those of t‐LMONs, h‐LMONs, and IrO 2 (Figure S18, Supporting Information). Meanwhile, the Tafel plots of o‐LMONs is 74 mV dec –1 , slightly smaller than that of IrO 2 (76 mV dec –1 ) (Figure 3e).…”

Section: Resultsmentioning

confidence: 99%

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

et al. 2021

Adv Funct Materials

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Ultrathin perovskite oxides with tailored crystal structures are promising catalysts for oxygen evolution reaction (OER) owing to their high intrinsic catalytic activity and large exposed active surface area. However, the synthesis of phase-controllable perovskite oxide nanosheets with thickness down to a few nanometers remains a challenge since the formation of a perovskite phase often requires long-time calcination at high temperatures. Here, a salt-templated strategy for fabrication of atomically thin perovskite oxide of LaMnO 3 with tailored phase structure for highly active OER catalysts is reported. The orthorhombic structure of LaMnO 3 nanosheets demonstrates much higher electrochemical activity than the tetragonal or hexagonal phase and the benchmark IrO 2 catalyst, exhibiting extremely small onset overpotential (≈70 mV) and a low overpotential (≈324 mV at 10 mA cm 2 disk − ) in alkaline solution. The remarkable OER activity of this catalyst is attributed to the desired surface binding energetics (or the unique electronic structures) inherent to the orthorhombic phase, as predicted by density functional theory calculations and confirmed by experimental measurements. Further, it is believed that this study paves a new path toward rational the design of perovskite oxide nanosheets with desired phase structures for many applications.

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“…The onset overpotential and overpotential at 10 mA

{cm}^{- 2}_{disk}

Section: Resultsmentioning

confidence: 99%

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

et al. 2021

Adv Funct Materials

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“…Wu et al obtained A-site deficient BSCF, (Ba 0.5 Sr 0.5 ) 0.8 Co 0.8 Fe 0.2 O 3−δ with a deficiency level of 0.2, from a sol−gel method and electrospinning, and both samples exhibited a considerable OER activity increase, which they attributed to a larger amount of oxygen vacancy and a higher concentration of Co 3+ relative to Co 2+ . 160 However, the A-site-deficient sample was found to contain a fraction of the Ba 3 Co 10 O 17 impurity phase which might make contributions to the overall catalytic activity. An investigation based on pure-phase, cation-deficient BSCF samples, likely with a deficiency level lower than 0.2, is therefore recommended to provide a better understanding into the effect of cationic defects.…”

Section: Energy Storage and Conversion Applicationsmentioning

confidence: 99%

“…Introducing cationic defects can also impact the oxygen vacancy content and transition metal valence. Wu et al obtained A-site deficient BSCF, (Ba 0.5 Sr 0.5 ) 0.8 Co 0.8 Fe 0.2 O 3−δ with a deficiency level of 0.2, from a sol–gel method and electrospinning, and both samples exhibited a considerable OER activity increase, which they attributed to a larger amount of oxygen vacancy and a higher concentration of Co 3+ relative to Co 2+ . However, the A-site-deficient sample was found to contain a fraction of the Ba 3 Co 10 O 17 impurity phase which might make contributions to the overall catalytic activity.…”

Section: Energy Storage and Conversion Applicationsmentioning

confidence: 99%

Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

Shao

2021

Energy Fuels

143

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In the societal pursuit of a carbon-neutral energy future, energy storage and conversion technologies can play a decisive role in better utilizing sustainable energy sources such as wind and solar, in which functional materials that can promote overall energy efficiency hold the key. Perovskite oxides have attracted considerable attention as cost-effective, nonprecious metal-based candidates for this purpose due to their flexible chemistries and tunable physicochemical properties. Of all the perovskite compositions, the barium strontium cobalt iron oxide with a specific chemical formula of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) has received considerable and growing interest over the last two decades in a variety of energy applications. In this review, we provide a comprehensive overview of the achievements made on BSCF for various energy storage and conversion applications. Importantly, we offer a fundamental understanding of the roles of BSCF in these applications and of the optimization approaches available to obtain improved functionalities, which can have an enormous impact on the search and development of materials based on BSCF and new materials beyond.

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“…The intrinsic catalytic activities of the catalysts were further evaluated. Based on the CV curves at different scanning rates in a non-Faradaic region (Figure S5a-c), the values of C dl for all samples were estimated via plotting the half difference between anodic (j a ) and cathodic (j c ) current densities at 1.116 V vs. RHE, namely ∆j = 0.5(j a − j c ), against the scanning rate v (mV/s), and which are equal to the slopes of linear fitting curves for the plotted scatter diagram (Figure S5d) [49], i.e., 11.8 (NPCNSs-900), 14.1 (NPCNSs-1000) and 5.9 mF cm −2 GEO (NPCNSs-1100). Obviously, NPCNSs-1000 has a higher ECSA (~352.5 cm 2 ECSA cm −2 GEO ) than NPCNSs-900 (~295.0 cm 2 ECSA cm −2 GEO ) and NPCNSs-1100 (~147.5 cm 2 ECSA cm −2 GEO ), indicating most electrochemically active sites on the surface of NPCNSs-1000.…”

Section: Orr Performances Of Npcnssmentioning

confidence: 99%

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

et al. 2022

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The defect and N-doping engineering are critical to developing the highly efficient metal-free electrocatalysts for oxygen reduction reaction (ORR), mainly because they can efficiently regulate the geometric/electronic structures and sur-/interface properties of the carbon matrix. Herein, we provide a facile and scalable strategy for the large-scale synthesis of N-doped porous carbon nanosheets (NPCNs) with hierarchical pore structure, only involving solvothermal and pyrolysis processes. Additionally, the turnover frequency of ORR (TOFORR) was calculated by taking into account the electron-transfer number (n). Benefiting from the trimodal pore structures, high specific surface area, a higher pore volume, high-ratio mesopores, massive vacancies/long-range structural defects, and high-content pyridinic-N (~2.1%), the NPCNs-1000 shows an excellent ORR activity (1600 rpm, js = ~5.99 mA cm−2), a selectivity to four-electron ORR (~100%) and a superior stability in both the three-electrode tests (CP test for 7500 s at 0.8 V, Δjs = ~0.58 mA cm−2) and Zn–Air battery (a negligible loss of 0.08 V within 265 h). Besides, the experimental results indicate that the enhancement of ORR activity mainly originates from the defects and pyridinic-N. More significantly, this work is expected to realize green and efficient energy storage and conversion along with the carbon peaking and carbon neutrality goals.

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A-site deficient perovskite nanofibers boost oxygen evolution reaction for zinc-air batteries

Cited by 49 publications

References 45 publications

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

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A-site deficient perovskite nanofibers boost oxygen evolution reaction for zinc-air batteries

Cited by 49 publications

References 45 publications

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

Phase Engineering of Atomically Thin Perovskite Oxide for Highly Active Oxygen Evolution

Fundamental Understanding and Application of Ba0.5Sr0.5Co0.8Fe0.2O3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future

2D Zinc-Based Metal–Organic Complexes Derived N-Doped Porous Carbon Nanosheets as Durable Air Cathode for Rechargeable Zn–Air Batteries

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Fundamental Understanding and Application of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−δPerovskite in Energy Storage and Conversion: Past, Present, and Future