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Electrochemical water splitting enhancement by introducing mesoporous NiCoFe-trimetallic phosphide nanosheets as catalysts for the oxygen evolution reaction.
Helal, Gouda; Xu, Zhenhang; Zuo, Wei; Yu, Yueying; Liu, Jinyan; Su, Hongping; Xu, Jianxin; Li, Houbin; Cheng, Gongzhen; Zhao, Pingping.
Afiliação
  • Helal G; College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 P. R. China gzcheng@whu.edu.cn.
  • Xu Z; Faculty of Science, Benha University Benha City Kalyobiya Egypt.
  • Zuo W; College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 P. R. China gzcheng@whu.edu.cn.
  • Yu Y; College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 P. R. China gzcheng@whu.edu.cn.
  • Liu J; School of Nursing, Wuhan University Wuhan Hubei 430072 P. R. China ppzhao@whu.edu.cn.
  • Su H; Department of Biological and Chemical Engineering, Zhixing College of Hubei University Wuhan 430011 P. R. China liujinyan2011@163.com.
  • Xu J; Gansu Yinguang Chemical Industry Group Co., Ltd Baiyin 730900 P. R. China.
  • Li H; Gansu Yinguang Chemical Industry Group Co., Ltd Baiyin 730900 P. R. China.
  • Cheng G; School of Nursing, Wuhan University Wuhan Hubei 430072 P. R. China ppzhao@whu.edu.cn.
  • Zhao P; College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 P. R. China gzcheng@whu.edu.cn.
RSC Adv ; 14(24): 17202-17212, 2024 May 22.
Article em En | MEDLINE | ID: mdl-38808232
ABSTRACT
Transition metal-based catalysts are widely used in electrocatalysis, especially in the field of water splitting, due to their excellent electrochemical performance, which focuses on improving the efficiency of the complex oxygen evolution reaction (OER) that occurs at the anode. Transition metal-based catalysts will undergo electrochemical surface reconstruction and form (oxy)hydroxide-based hybrids, which consider the actual active sites for OER. So many efforts have been made to know the origin of the effect of electrochemical surface reconstruction on the performance of the OER. Herein, NiCoFe-phosphide catalyst nanosheets were constructed by a simple one-step hydrothermal reaction by adding oleylamine and ethanol to water solvent during the preparation of the catalyst precursor and high-temperature gas-phase phosphating and significantly showed high effectiveness catalytic activity and conductivity in comparison to normal and traditional preparation methods. Electrochemical analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) demonstrate that the surface was constructed during the electrochemical reaction and formed an amorphous layer of MOx(OH)y active sites, which increased the electrochemical surface area and promoted charge transfer. As well, the synthesized NiCoFePx-PNSs catalyst nanosheets exhibit excellent catalytic activity with a low overpotential equal to 259 mV to achieve the OER at a current density of 10 mA cm-2 and a low Tafel slope of 50.47 mV dec-1 which is better than for most reported transition metal-based electrocatalysts. This work provides a new design for a transition metal-based catalyst for OER as well as further insights into the effect of electrochemical surface reconstruction on intrinsic activity and OER performance.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: RSC Adv Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: RSC Adv Ano de publicação: 2024 Tipo de documento: Article