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• W3096756064 endingPage "148336" @default.
• W3096756064 startingPage "148336" @default.
• W3096756064 abstract "Nickel-iron phosphides hollow nanospheres as pre-catalysts for electrochemical water oxidation in alkaline solution were synthesized through a low-temperature solvothermal method using metal-organic framework precursors. • Low-temperature solvothermal phosphorization to synthesize nickel-iron phosphides. • (Ni 0.73 Fe 0.27 ) 2 P as precatalysts exhibit excellent water oxidation activities. • Transformation of phosphides to layered double hydroxides was observed. • Demonstration of solar-to-hydrogen device was constructed. Developing active and stable water oxidation electrocatalysts is desired to increase the efficiency of water electrolyzers. Nickel phosphides have been reported as pre-catalysts for water oxidation reaction. However, their catalytic activities can further be improved through morphology engineering and tuning electronic structures. Here, nickel-iron phosphides hollow nanospheres ((Ni 1-x Fe x ) 2 P, x = 0–0.35) were synthesized through solvothermal treatment of Ni-Fe metal-organic framework precursors with white phosphorus. The hollow nanospheres have diameters around 20–50 nm, with the crystalized structure resembles Ni 2 P phase. When used to catalyze the water oxidation reaction in 1 M KOH, the (Ni 0.73 Fe 0.27 ) 2 P/Ni foam electrode exhibits best catalytic performance, with only 243 mV overpotentials to reach 10 mA cm −2 (loading 0.135 mg Ni+Fe cm −2 ), and with a Tafel slope ~ 30 mV dec −1 . The enhanced water oxidation activity is mainly owing to the electronic interaction between Ni and Fe. Ex-situ characterizations of the (Ni 0.73 Fe 0.27 ) 2 P after water oxidation reaction reveal that surface phosphides are transformed into layered double hydroxides under anodic alkaline conditions. The solvothermal prepared (Ni 1-x Fe x ) 2 P hollow nanospheres can be a potential candidate as pre-catalysts for water oxidation reaction in water electrolyzers." @default.
• W3096756064 created "2020-11-09" @default.
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• W3096756064 date "2021-02-01" @default.
• W3096756064 modified "2023-10-03" @default.
• W3096756064 title "Solvothermal preparation of nickel-iron phosphides hollow nanospheres derived from metal-organic frameworks for water oxidation reaction" @default.
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• W3096756064 doi "https://doi.org/10.1016/j.apsusc.2020.148336" @default.
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