Chemical scission derived two-dimensional NiFe layered double hydroxide nanoswords for efficient water splitting

Yu, Jie; Liu, Ying; Yu, Feng; Liu, Zhisong; Wang, Huhu; Peng, Banghua; Wang, Gang; Wang, Chundong; Poh, Chee Kok; Wang, Fu; Zhang, Lili

doi:10.1016/j.jpowsour.2022.232200

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…Its intrinsic OER activity depends on the binding energy of the reaction intermediates (*O, *OH, and *OOH) on catalytic sites. Accordingly, multiple strategies have been proposed to optimize the intermediate adsorption energy, including morphologic regulation, , defect engineering, − interface engineering, − surface reconstruction, , and spin state transition regulation. − …”

Section: Introductionmentioning

confidence: 99%

Intercalated and Surface-Adsorbed Phosphate Anions in NiFe Layered Double-Hydroxide Catalysts Synergistically Enhancing Oxygen Evolution Reaction Activity

Ding,

Zheng,

Wang

et al. 2024

Langmuir

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The oxygen evolution reaction (OER), a crucial semireaction in water electrolysis and rechargeable metal−air batteries, is vital for carbon neutrality. Hindered by a slow proton-coupled electron transfer, an efficient catalyst activating the formation of an O−H bond is essential. Here, we proposed a straightforward one-step hydrothermal procedure for fabricating PO 4 3− -modified NiFe layered double-hydroxide (NiFe LDH) catalysts and investigated the role of PO 4 3− anions in enhancing OER. Phosphate amounts can efficiently regulate LDH morphology, crystallinity, composition, and electronic configuration. The optimized sample showed a low overpotential of 267 mV at 10 mA cm −2 . Density functional theory calculations revealed that intercalated and surface-adsorbed PO 4 3− anions in NiFe LDH reduced the Gibbs free energy in the rate-determining step of *OOH formation, balancing oxygen-containing intermediate adsorption/dissociation and promoting the OER. Intercalated phosphate ions accelerated precatalyst dehydrogenation kinetics, leading to a rapid reconstruction into active NiFe oxyhydroxide species. Surface-adsorbed PO 4 3− interacted favorably with adsorbed *OOH on the active Ni sites, stabilizing *OOH. Overall, the synergistic effects of intercalated and surface-adsorbed PO 4 3− anions significantly contributed to enhanced OER activity. Achieving optimal catalytic activity requires a delicate equilibrium between thermodynamic and kinetic factors by meticulously regulating the quantity of introduced PO 4 3− ions. This endeavor will facilitate a deeper comprehension of the influence of anions in electrocatalysis for OER.

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