Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 617, Issue -, Pages 585-593Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.02.105
Keywords
Oxygen evolution reaction; MOFs; Ni- 5 P (4); NC@CoFeP; NC; Stability
Categories
Funding
- Beijing Key Laboratory for Chemical Power Source and Green Catalysis, Beijing Institute of Technology
- Analysis & Testing Center, Beijing Institute of Technology
- shiyanjia lab
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In this work, a novel Ni5P4/N-doped carbon@CoFeP/N-doped carbon composite (Ni5P4/NC@CoFeP/NC) is presented as an efficient electrocatalyst for the oxygen evolution reaction (OER). The composite exhibits excellent conductivity and OER performance, with low overpotential, ultra-low Tafel slope, and good stability in 1 M KOH. XPS analysis reveals that the proper chemical composition of the composite promotes the oxidation of transition metal species and the chemisorption of OH-, thus accelerating the OER kinetics.
As an efficient non-precious metal catalyst for the oxygen evolution reaction (OER), phosphides suffer from poor electrical conductivity, so it is still a challenge to reasonably design their structures to further improve their conductivity and OER performances. Here, we present a novel Ni5P4/N-doped carbon@CoFeP/N-doped carbon composite (Ni5P4/NC@CoFeP/NC) as electrocatalysts for OER. This elaborate structure consists of Ni5P4/NC derived from Ni-MOF and CoFeP/NC derived from CoFe-Prussian blue analog MOF (Co-Fe PBA). The cube-like CoFeP/NC are scattered and uniformly coated on the sheet of Ni5P4/NC flowers. Among them, NC can enhance the conductivity of phosphides, while CoFeP/NC can increase the electrochemical active area, which benefit the properties of Ni5P4/NC@CoFeP/NC. Notably, the Ni5P4/NC@CoFeP/NC catalyst possesses outstanding OER performances with a low overpotential of 260 and 303 mV at a current density of 10 and 100 mA center dot cmxe003;2, an ultra-low Tafel slope of 31.1 mV center dot dec1 and excellent stability in 1 M KOH. XPS analysis shows that proper chemical composition promotes the oxidation of transition metal species and the chemisorption of OH-, thus accelerating the OER kinetics. Therefore, this work provides a hopeful method for designing and preparing transition metal phosphide/carbon composite as OER electrocatalysts.
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