Activity and Stability of Ruddlesden–Popper‐Type Lan+1NinO3n+1 (n=1, 2, 3, and ∞) Electrocatalysts for Oxygen Reduction and Evolution Reactions in Alkaline Media

Yu, Jie; Sunarso, Jaka; Zhu, Yinlong; Xu, Xiaomin; Ran, Ran; Zhou, Wei

doi:10.1002/chem.201504279

Cited by 99 publications

(37 citation statements)

References 59 publications

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“…The ORR kinetics information, in the form of Tafel plots in the potential region between 0.75 and 0.95 V, are depicted in Figure e. From the Tafel equation, the calculated Tafel slopes for LSM, LSMP0.02, LSMP0.05, LSMP0.1, and Pt/C are 150, 146, 114, 121, and 71 mV dec −1 , respectively . With the exception of Pt/C, LSMP0.05 provided the lowest slope, which indicated the most facile ORR kinetics, that is, better performance to achieve high current at low overpotential.…”

Section: Resultsmentioning

confidence: 99%

New Phosphorus‐Doped Perovskite Oxide as an Oxygen Reduction Reaction Electrocatalyst in an Alkaline Solution

Shen

Zhu

Sunarso

et al. 2018

Chemistry A European J

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Because of their structural and compositional flexibility, perovskite oxides represent an attractive alternative electrocatalyst class to precious metals for the oxygen reduction reaction (ORR); an important reaction in fuel cells and metal-air batteries. Partial replacement of the original metal cation with another cation, namely, doping, can be used to tailor the ORR activity of perovskite, for which a metal has been exclusively used as the dopant component in the past. Herein, phosphorus is proposed as a non-metal dopant for the cation site to develop a new perovskite family with the formula of La Sr Mn P O (x=0, 0.02, 0.05, and 0.1; denoted as LSM, LSMP0.02, LSMP0.05, and LSMP0.1, respectively). Powder XRD patterns reveal that the solubility of phosphorus in the perovskite structure is around 0.05. Rotating ring-disk electrode experiments in the form of linear-sweep voltammetry scans demonstrated the best ORR performance for LSMP0.05, and also revealed close to a four-electron ORR pathway for all four compositions. A chronoamperometric test (9000 s) and 500 cycle accelerated durability test demonstrated higher durability for LSMP0.05 relative to that of LSM and the commercial 20 wt % Pt/C catalyst. The higher ORR activity for LSMP0.05 is attributed to the optimised average valence of Mn, as evidenced by combined X-ray photoelectron spectroscopy and soft X-ray absorption spectroscopy data. Doping phosphorus into perovskites is an effective way to develop high-performance electrocatalysts for ORR.

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Section: Resultsmentioning

confidence: 99%

New Phosphorus‐Doped Perovskite Oxide as an Oxygen Reduction Reaction Electrocatalyst in an Alkaline Solution

Shen

Zhu

Sunarso

et al. 2018

Chemistry A European J

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“…The concentration of O ad is one of the significant factors in the catalytic activity for OER because O ad can easily be converted to O 2 [33]. In this regard, it has been confirmed that the excellent OER performance of Opt-NSC@Co 3 O 4 is derived from the high concentration of O ad .…”

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confidence: 75%

Strategy for Enhancing Interfacial Effect of Bifunctional Electrocatalyst: Infiltration of Cobalt Nanooxide on Perovskite

Kim

Kwon

Kim

et al. 2018

Adv Materials Inter

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Recently, hybrid catalysts are a critical issue to realize electrocatalysts having competitive price and effective bifunctional activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In the case of hybrid catalysts, synergistic effect is observed through electronic and structural reconstructions at the interface between dissimilar oxides, which provides the improved catalytic activity for ORR and OER. Herein, the Co 3 O 4 deposited Nd 0.5 Sr 0.5 CoO 3−δ (NSC) catalyst is designed to achieve the strain and ligand effect considered as rationale for synergistic effect. A well-designed bifunctional hybrid catalyst (Opt-NSC@Co 3 O 4 ) is prepared through a useful infiltration technique by tuning the wettability of the precursor solution and the concentration of the Co 3 O 4 . Through systematic analysis and re-design, both the onset potential and the limiting current density for ORR and OER are significantly improved with unique microstructure fabricated by the infiltration technique. Opt-NSC@Co 3 O 4 shows outstanding cell performance and excellent stability during 60 h with the discharge-charge voltage gap of 0.5 V for a hybrid Li-air battery. The enhanced electrochemical performance suggests that the derived hybrid catalysts fabricated by the advanced infiltration technique could be promising materials for environmentally benign energy-related applications. Interfacial Effect

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“…Hydrogen, a zero carbon emission energy carrier, is considered as one of the most environmentally benign and renewable alternatives to fossil fuels 1. However, hydrocarbon reforming is currently the main pathway to produce hydrogen, which is associated with high fossil fuel consumption and significant amount of CO 2 release.…”

Section: Introductionmentioning

confidence: 99%

Bifunctionality from Synergy: CoP Nanoparticles Embedded in Amorphous CoOx Nanoplates with Heterostructures for Highly Efficient Water Electrolysis

Zhong

et al. 2018

Advanced Science

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146

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Hydrogen production from renewable electricity relies upon the development of an efficient alkaline water electrolysis device and, ultimately, upon the availability of low cost and stable electrocatalysts that can promote oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Normally, different electrocatalysts are applied for HER and OER because of their different reaction intermediates and mechanisms. Here, the synthesis of a heterostructured CoP@a‐CoOx plate, which constitutes the embedded crystalline cobalt phosphide (CoP) nanoclusters and amorphous cobalt oxides (CoOx) nanoplates matrix, via a combined solvothermal and low temperature phosphidation route is reported. Due to the presence of synergistic effect between CoP nanoclusters and amorphous CoOx nanoplates in the catalyst, created from the strong nanointerfaces electronic interactions between CoP and CoOx phases in its heterostructure, this composite displays very high OER activity in addition to favorable HER activity that is comparable to the performance of the IrO2 OER benchmark and approached that of the Pt/C HER benchmark. More importantly, an efficient and stable alkaline water electrolysis operation is achieved using CoP@a‐CoOx plate as both cathode and anode as evidenced by the obtainment of a relatively low potential of 1.660 V at a 10 mA cm−2 current density and its marginal increase above 1.660 V over 30 h continuous operation.

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Activity and Stability of Ruddlesden–Popper‐Type La_n+1Ni_nO_3n+1 (n=1, 2, 3, and ∞) Electrocatalysts for Oxygen Reduction and Evolution Reactions in Alkaline Media

Cited by 99 publications

References 59 publications

New Phosphorus‐Doped Perovskite Oxide as an Oxygen Reduction Reaction Electrocatalyst in an Alkaline Solution

New Phosphorus‐Doped Perovskite Oxide as an Oxygen Reduction Reaction Electrocatalyst in an Alkaline Solution

Strategy for Enhancing Interfacial Effect of Bifunctional Electrocatalyst: Infiltration of Cobalt Nanooxide on Perovskite

Bifunctionality from Synergy: CoP Nanoparticles Embedded in Amorphous CoOx Nanoplates with Heterostructures for Highly Efficient Water Electrolysis

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