Interface Engineering of CoS/CoO@N-Doped Graphene Nanocomposite for High-Performance Rechargeable Zn–Air Batteries

Nano-Micro Letters, Journal Year: 2020, Volume and Issue: 13(1)

Published: Oct. 27, 2020

Abstract Low cost and green fabrication of high-performance electrocatalysts with earth-abundant resources for oxygen reduction reaction (ORR) evolution (OER) are crucial the large-scale application rechargeable Zn–air batteries (ZABs). In this work, our density functional theory calculations on electrocatalyst suggest that rational construction interfacial structure can induce local charge redistribution, improve electronic conductivity enhance catalyst stability. order to realize such a structure, we spatially immobilize heterogeneous CoS/CoO nanocrystals onto N-doped graphene synthesize bifunctional (CoS/CoO@NGNs). The optimization composition, is conducted achieve catalytic activity deliver outstanding efficiency stability both ORR OER. aqueous ZAB as-prepared CoS/CoO@NGNs cathode displays high maximum power 137.8 mW cm −2 , specific capacity 723.9 mAh g −1 excellent cycling (continuous operating 100 h) round-trip efficiency. addition, assembled quasi-solid-state also exhibits mechanical flexibility besides battery performances, showing great potential applications in flexible wearable devices.

Language: Английский

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Defect engineering in metal sulfides for energy conversion and storage

Coordination Chemistry Reviews, Journal Year: 2021, Volume and Issue: 448, P. 214147 - 214147

Published: Aug. 27, 2021

Language: Английский

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Single‐Atom Co‐Decorated MoS₂ Nanosheets Assembled on Metal Nitride Nanorod Arrays as an Efficient Bifunctional Electrocatalyst for pH‐Universal Water Splitting

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(26)

Published: April 20, 2021

Abstract The commercialization of electrochemical water splitting technology requires electrocatalysts that are cost‐effective, highly efficient, and stable. Herein, an advanced bifunctional electrocatalyst based on single‐atom Co‐decorated MoS 2 nanosheets grown 3D titanium nitride (TiN) nanorod arrays (CoSAs‐MoS /TiN NRs) has been developed for overall in pH‐universal electrolytes. When applied as a self‐standing cathodic electrode, the CoSAs‐MoS NRs overpotentials 187.5, 131.9, 203.4 mV to reach HER current density 10 mA cm –2 acidic, alkaline, neutral conditions, respectively, which superior most previously reported non‐noble metal at same density. anodic electrode also shows low OER 454.9, 340.6, 508.0 mV, mediums, markedly outperforming catalysts elsewhere. More importantly, electrolyzer delivered from electrodes exhibits extraordinary performance with good stability durability conditions.

Language: Английский

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Electrochemically Modifying the Electronic Structure of IrO₂ Nanoparticles for Overall Electrochemical Water Splitting with Extensive Adaptability

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 10(30)

Published: June 18, 2020

Abstract Designing the electrocatalysts that are stable and active for extensively adaptable water splitting is highly desirable developing hydrogen based energy. IrO 2 a promising widely used catalyst oxygen evolution reaction in commercial applications, but rarely (HER), due to high Gibbs free energy adsorption (Δ G H* ). Herein, an approach modify electronic structure of via cyclic voltammetry proposed. In this process, Ir(+4) partially reduced trace Pt simultaneously deposited on , which greatly lowers Δ thus accelerates kinetics. The as‐prepared Pt–IrO /CC with low noble metal loading (36.6 µg cm −2 (Ir+Pt) ) exhibits excellent HER activity overpotentials 5, 22, 26 mV at 10 mA 0.5 m H SO 4 1 KOH, phosphate buffer solution, respectively, making it possible organize all‐IrO electrolyzer. /CC||IrO couple stability pH‐universal conditions as well natural seawater production. Density function theory calculations reveal optimized balances resulting much enhanced performance.

Language: Английский

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Redox bifunctional activities with optical gain of Ni3S2 nanosheets edged with MoS2 for overall water splitting

Applied Catalysis B Environment and Energy, Journal Year: 2019, Volume and Issue: 268, P. 118435 - 118435

Published: Nov. 16, 2019

Language: Английский

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