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Oxyanion Engineering Suppressed Iron Segregation in Nickel-Iron Catalysts Toward Stable Water Oxidation.
Liao, Hanxiao; Ni, Ganghai; Tan, Pengfei; Liu, Kang; Liu, Xuanzhi; Liu, Hele; Chen, Kejun; Zheng, Xusheng; Liu, Min; Pan, Jun.
Afiliación
  • Liao H; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
  • Ni G; School of Physical and Electronics, Central South University, Changsha, 410083, P. R. China.
  • Tan P; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
  • Liu K; School of Physical and Electronics, Central South University, Changsha, 410083, P. R. China.
  • Liu X; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
  • Liu H; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
  • Chen K; School of Physical and Electronics, Central South University, Changsha, 410083, P. R. China.
  • Zheng X; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, P. R. China.
  • Liu M; School of Physical and Electronics, Central South University, Changsha, 410083, P. R. China.
  • Pan J; State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.
Adv Mater ; 35(21): e2300347, 2023 May.
Article en En | MEDLINE | ID: mdl-36881381
Nickel-iron catalysts represent an appealing platform for electrocatalytic oxygen evolution reaction (OER) in alkaline media because of their high adjustability in components and activity. However, their long-term stabilities under high current density still remain unsatisfactory due to undesirable Fe segregation. Herein, a nitrate ion (NO3 - ) tailored strategy is developed to mitigate Fe segregation, and thereby improve the OER stability of nickel-iron catalyst. X-ray absorption spectroscopy combined with theoretical calculations indicate that introducing Ni3 (NO3 )2 (OH)4 with stable NO3 - in the lattice is conducive to constructing the stable interface of FeOOH/Ni3 (NO3 )2 (OH)4 via the strong interaction between Fe and incorporated NO3 - . Time of flight secondary ion mass spectrometry and wavelet transformation analysis demonstrate that the NO3 - tailored nickel-iron catalyst greatly alleviates Fe segregation, exhibiting a considerably enhanced long-term stability with a six-fold improvement over FeOOH/Ni(OH)2 without NO3 - modification. This work represents a momentous step toward regulating Fe segregation for stabilizing the catalytic performances of nickel-iron catalysts.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2023 Tipo del documento: Article Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Adv Mater Asunto de la revista: BIOFISICA / QUIMICA Año: 2023 Tipo del documento: Article Pais de publicación: Alemania