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Bimetallic Nickel-Substituted Cobalt-Borate Nanowire Array: An Earth-Abundant Water Oxidation Electrocatalyst with Superior Activity and Durability at Near Neutral pH.
Ma, Min; Qu, Fengli; Ji, Xuqiang; Liu, Danni; Hao, Shuai; Du, Gu; Asiri, Abdullah M; Yao, Yadong; Chen, Liang; Sun, Xuping.
Afiliación
  • Ma M; College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Qu F; College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Ji X; College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, Shandong, China.
  • Liu D; College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Hao S; College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Du G; College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Asiri AM; Chengdu Institute of Geology and Mineral Resources, Chengdu, 610081, Sichuan, China.
  • Yao Y; Chemistry Department, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
  • Chen L; College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, Sichuan, China.
  • Sun X; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, Zhejiang, China.
Small ; 13(25)2017 07.
Article en En | MEDLINE | ID: mdl-28508425
There is an urgent demand to develop earth-abundant electrocatalysts for efficient and durable water oxidation under mild conditions. A nickel-substituted cobalt-borate nanowire array is developed on carbon cloth (Ni-Co-Bi/CC) via oxidative polarization of NiCo2 S4 nanoarray in potassium borate (K-Bi). As a bimetallic electrocatalyst for water oxidation, such Ni-Co-Bi/CC is superior in catalytic activity and durability in 0.1 m K-Bi (pH: 9.2), with a turnover frequency of 0.33 mol O2 s-1 at the overpotential of 500 mV and nearly 100% Faradaic efficiency. To drive a geometrical catalytic current density of 10 mA cm-2 , it only needs overpotential of 388 mV, 34 mV less than that for Co-Bi/CC, outperforming reported non-noble-metal catalysts operating under benign conditions. Notably, its activity is maintained over 80 000 s. Density functional theory calculations suggest that the O* to OOH* conversion is the rate-determining step and Ni substitution decreases the free energy on Co-Bi from 2.092 to 1.986 eV.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2017 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2017 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania