Enhancing Electrocatalytic Activity of Perovskite Oxides by Tuning Cation Deficiency for Oxygen Reduction and Evolution Reactions

Zhu, Yinlong; Zhou, Wei; Yu, Jie; Chen, Yubo; Liu, Meilin; Shao, Zongping

doi:10.1021/acs.chemmater.5b04457

Cited by 649 publications

(534 citation statements)

References 58 publications

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“…Such nanohybrids are expected to have high catalytic performance. [25,26] A detailed study on the local compositions, crystal structures, and pore sizes of L-0.5 perovskite was then performed by using the transmission electron microscopy (TEM) facility. Figure 1c displays the X-ray diffraction (XRD) patterns of L-0.5, PBSCF, and LBSCF, which were all identified as pure perovskite phases ( Figure S1, Supporting Information).…”

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confidence: 99%

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All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

Hua

Zhang

et al. 2017

Advanced Energy Materials

131

106

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catalysts with low-cost and earth-abundant materials. [5][6][7][8][9][10] In terms of achieving the best performances, the HER is usually carried out in an acidic environment while the OER in an alkaline condition. Nevertheless, practical utilization of these electrodes in an integrated electrolysis device has been hindered since the HER and OER catalysts usually require very different pH values in order to produce long lifetimes and high activities. In this context, a bifunctional electrocatalyst with high activities for both the OER and HER in an identical condition is desired. [10][11][12][13] Most state-of-the-art water splitting catalyst researches have been focused on the development of nonprecious metal catalysts that are competitive to precious metals. [5][6][7][8][9][10][14][15][16][17][18] As a result, perovskites are being spotlighted as promising candidates due to their favorable compositional flexibility and good stability in a wide range of electrochemical window, thus enabling easy modification of their catalytic properties. Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) has been introduced as an excellent OER catalyst, whose catalytic activity for water oxidation is one order higher than that of IrO 2 in alkaline conditions. [16][17][18] Furthermore, Xu et al. proved BSCF is capable of catalyzing HER in alkaline conditions. [15] They also found that its HER catalytic performance and durability can be drastically improved via proper A-site Pr-doping. Nevertheless, surface amorphous phases in Pr-doped BSCF were still found after the durability test. It was reported that a smaller size mismatch between the host and dopant cations in the A-site has a remarkable effect on rationalizing the stabilities and activities of cubic BSCF. [19,20] Consequently, we predict that the La-doped BSCF would possess better robustness than Pr-doped BSCF (note that the sequence of ion radiuses is Ca 2+

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confidence: 99%

“…[15,18,[26][27][28] To shed light on the origin of the outstanding catalytic performance of L-0.5/rGO catalyst, we set up a series of characterizations to disclose the nature of L-0.5/rGO composite. Regarding the perovskite electrocatalyst, it has been reported that the active sites for both HER and OER lie in the B-site centers and oxygen anions (vacancies).…”

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confidence: 99%

All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

Hua

Zhang

et al. 2017

Advanced Energy Materials

131

106

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“…[14,15] The catalytically active transition metals nanoparticles, such as Pd, Ru, Pt, Ag, Co, Ni, and Fe, are exsolved as nanoparticles from the A/B site of perovskite oxides backbone under a reducing atmosphere. [21,22] As an approach to enhance the electrical conductivity, the perovskite/carbon composites have been suggested since the carbon is one of the excellent conducting materials at room temperature. [16][17][18] This operando manufacture way can spontaneously lead to the formation of ordered layered oxygen deficiency and the yield segregation of massively and finely dispersed metallic nanoparticles.…”

Section: A Composite Catalyst Based On Perovskites For Overall Water mentioning

confidence: 99%

A Composite Catalyst Based on Perovskites for Overall Water Splitting in Alkaline Conditions

Kim

Kwon

et al. 2019

ChemElectroChem

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Electrochemical water splitting is considered a sustainable way to produce H2. However, it is still a challenge to develop efficient and stable electrocatalysts. Here, a bifunctional composite catalyst for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) was constructed by using a facile in situ growth route, which combines the carbonization on exsolved alloy nanoparticles and sulfurization in one continues step. This composite catalyst contains Ruddlesden‐Popper‐type S‐adsorbed (Nd0.6Sr0.4)3((Co,Fe)0.85Nb0.15)2O7, metal sulfides, and hollow S‐doped carbon fibers. Compared to the untreated catalyst, Nd0.6Sr0.4Co0.6Fe0.3Nb0.1O3‐δ, the composite catalyst leads to significantly enhanced OER and HER activities as well as excellent stability (more than 400 h without inactivation) during overall water splitting. Our research offers a new route to fabricate hetero‐architecture materials with S‐doped hollow carbon fibers on alloy nanoparticles of perovskite oxides.

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“…[5][6][7][8][9][10] The cathodic oxygen reduction reaction (ORR) is a critical process in fuel cells and largely decides their ultimate performance. [11][12][13][14] Although platinum (Pt) and platinum-based alloys are the best known ORR catalysts, the scarcity and declining activity of Pt-based catalysts significantly impede their practical use. 15 Therefore, the development of electrocatalysts with low price, high-efficiency and high stability as an alternative to Pt for the ORR is urgently needed.…”

Section: Introductionmentioning

confidence: 99%

A Bonded Double-Doped Graphene Nanoribbon Framework for Advanced Electrocatalysis

Chen

Xiao

Liu

et al. 2016

ACS Appl. Mater. Interfaces

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The preparation of a low-cost, high-efficient, and stable electrocatalyst as an alternative to platinum for the oxygen reduction reaction (ORR) is especially important to various energy storage components, such as fuel cells and metal-air batteries. Here, we report a new type of bonded double-doped graphene nanoribbon-based nonprecious metal catalysts in which Fe3C nanoparticles embedded in Fe-N-doped graphene nanoribbon (GNRs) frameworks through a simple pyrolysis. The as-obtained catalyst possesses several desirable merits for the ORR, such as diverse high-efficiency catalytic sites, a high specific surface area, an ideal hierarchical cellular structure, and a highly conductive N-doped GNR network. Accordingly, the prepared catalyst shows a superior ORR activity (an onset potential of 0.02 V and a half-wave potential of -0.148 V versus an Ag/AgCl electrode) in alkaline media, close to the commercial Pt/C catalyst. Moreover, it also displays good ORR behavior in an acidic solution.

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Enhancing Electrocatalytic Activity of Perovskite Oxides by Tuning Cation Deficiency for Oxygen Reduction and Evolution Reactions

Cited by 649 publications

References 58 publications

All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

A Composite Catalyst Based on Perovskites for Overall Water Splitting in Alkaline Conditions

A Bonded Double-Doped Graphene Nanoribbon Framework for Advanced Electrocatalysis

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