Atomically dispersed Au single sites and nanoengineered structural defects enable a high electrocatalytic activity and durability for hydrogen evolution reaction and overall urea electrolysis

Wan, Ziyi; Yang, Kunshan; Li, Pingping; Yang, Songru; Wang, Xinning; Gao, Ruiqin; Xie, Xinmeng; Deng, Guowei; Yang, Min; Wang, Zhifan

doi:10.1016/j.electacta.2024.144685

Electrochimica Acta

2024

DOI: 10.1016/j.electacta.2024.144685

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Atomically dispersed Au single sites and nanoengineered structural defects enable a high electrocatalytic activity and durability for hydrogen evolution reaction and overall urea electrolysis

Ziyi Wan,

Kunshan Yang,

Pingping Li

et al.

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Cited by 2 publications

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Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Zhou,

Li,

Zhong

et al. 2024

Chemistry An Asian Journal

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Mn:CsPbX3 (X= Cl, Br) nanosheets with excellent electrocatalytic properties are reported in this paper. Compared to conventional catalyst arrays, the band gap of Mn:CsPbBr3 nanocrystalline is easily tuned, the carrier diffusion distance is remote, the band edge position of the band structure is favorable for a wide range of electrocatalytic redox reactions, and the catalytic active site is maximally exposed. The Mn:CsPbBr3 exhibited preferable electrocatalytic hydrogen evolution (HER) performance in 1 mol/L KOH. The excess potential of the oxygen evolution reaction(OER) required to drive current densities of 10 and 100 mA cm‐2 is only 114.4 and 505.4 mV, with a Tafel slope of 43 mV dec‐1. At a current density of 10 mA cm‐2, the excess potential required for the HER is 158.6 mV and it exhibited excellent electrochemical stability. The Mn:CsPbBr3 nanocrystalline consists of two electrodes for the overall water splitting, requiring a voltage of only 1.45 V. Which in turn provides implications for the optimization of electrocatalysts in alkaline electrolytes with the aim of developing the next generation of 2D electrocatalysts for overall water splitting.

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Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Zhou,

Li,

Zhong

et al. 2024

Chemistry An Asian Journal

View full text Add to dashboard Cite

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Single-Atom to Ultrasmall Au Nanoparticles Anchored on NiFe Layered Double Hydroxide as Catalyst for Oxygen and Hydrogen Evolution Reactions

Pattaweepaiboon,

Samarungkasut,

Iamprasertkun

et al. 2024

ACS Appl. Nano Mater.

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Owing to the limited supply and high cost, the rational design of precious metal-based catalysts is of essential importance for boosting the electrocatalytic activity. Herein, the variation of Au species from single-atoms to ultrasmall nanoparticles (3−6 nm) deposited on NiFe-layered double hydroxide (NiFe-LDH) was investigated as a bifunctional electrocatalyst for oxygen and hydrogen evolution reactions. The brucite-like layered structure of NiFe-LDH was verified by X-ray diffraction. The existence of Au single-atom and ultrasmall nanoparticles as well as the local bonding environment of Au species were evaluated by high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The integration of Au into NiFe-LDH as single atoms and metallic nanoparticles shows significant improvement in the electrocatalytic activity in 1 M KOH. Singleatom Au/NiFe-LDH (2Au/NiFe-LDH, 0.21 wt % Au) delivers the lowest overpotential of 209 mV to catalyze 10 mA cm −2 OER current density with the Tafel slope of 46.5 mV dec −1 . On the other hand, Au nanoparticles/NiFe-LDH (50Au/NiFe-LDH, 3.22 wt % Au) possesses an overpotential of 150 mV at 10 mA cm −2 HER current density with the Tafel slope of 134.5 mV dec −1 . For overall water splitting, under the optimum conditions, the 2Au/NiFe-LDH//50Au/NiFe-LDH couple requires the cell potentials of 1.62 and 1.78 V to deliver the current density of 10 and 100 mA cm −2 in 1 M KOH. These findings provide insights into the effect of decoration of Au species on the NiFe-LDH catalyst surface for the efficient performance in the production of O 2 and H 2 in the alkaline electrolyte.

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Atomically dispersed Au single sites and nanoengineered structural defects enable a high electrocatalytic activity and durability for hydrogen evolution reaction and overall urea electrolysis

Cited by 2 publications

References 39 publications

Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Single-Atom to Ultrasmall Au Nanoparticles Anchored on NiFe Layered Double Hydroxide as Catalyst for Oxygen and Hydrogen Evolution Reactions

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Atomically dispersed Au single sites and nanoengineered structural defects enable a high electrocatalytic activity and durability for hydrogen evolution reaction and overall urea electrolysis

Cited by 2 publications

References 39 publications

Defect Passivation of Mn2+‐Doped CsPbX3(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Defect Passivation of Mn2+‐Doped CsPbX3(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Single-Atom to Ultrasmall Au Nanoparticles Anchored on NiFe Layered Double Hydroxide as Catalyst for Oxygen and Hydrogen Evolution Reactions

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Product

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Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting

Defect Passivation of Mn²⁺‐Doped CsPbX₃(X=Cl,Br) Perovskite Nanocrystals as Electrocatalyst for Overall Water Splitting