Abstract
To improve the electrocatalytic properties for hydrogen evolution reactions, strategies need to be adopted, such as increasing specific surface area and active site, as well as decreasing interface energy. Herein, we report the preparation of FeP on carbon cloth using a two-step process of hydrothermal and phosphating. Otherwise, to utilize the excellent catalytic performance of Pt and decrease consumption of Pt, the hyperdispersed Pt nanoparticles for the sake of modifying transition-metal phosphides film were designed and fabricated. Finally, 3D FeP-Pt/CC was successfully prepared by means of electro-deposition using three electrodes. The crystalline structure, surface morphology and elemental composition of the synthesized samples have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The XRD results show that the as-prepared products are of orthorhombic FeP structure, and EDS results indicate that there exist Pt elements in 3D FeP-Pt/CC. The electrocatalytic performances were evaluated by, such as linear scan voltammetry, tafel plots and electrochemical impedance spectroscopy on electrochemical workstations. These results show that the FeP-Pt/CC exhibit a current density of 10 mA·cm−2 at an over-potential of 58 mV for HER in 0.5 M H2SO4, which is very close to the values of 20%Pt/C which was previously reported. FeP-Pt/CC has excellent durability.
Highlights
Received: 29 October 2021With the increasing depletion of fossil fuels and tremendous environmental pollution, hydrogen energy is extensively concerned as it is a clean, highly efficient and renewable energy alternative [1,2,3,4,5,6]
The solution of Ferric nitrate, ammonium fluoride and carbamide was prepared in a reactor, and the treated carbon cloth (CC) matrix was placed in the solution at 120 ◦ C for 12 h
The diffraction peaks of Platinum shown in the X-ray diffraction (XRD) pattern of FeP-Pt/CC in Figure 1 at
Summary
With the increasing depletion of fossil fuels and tremendous environmental pollution, hydrogen energy is extensively concerned as it is a clean, highly efficient and renewable energy alternative [1,2,3,4,5,6]. Transition-metal phosphides with high conductivity, chemical stability, special crystal structure and abundant valence state have been intensively focused. To improve the electrocatalytic performances, an important strategy is increasing the number of active sites by means of generating a larger specific surface area [11,12,13,14]. Three dimension (3D) basal electrodes, for example, carbon cloth has excellent conductivity, mechanical properties and larger specific surface area [15]. Pt metal is regarded to be the most efficient electrocatalyst for hydrogen evolution reactions [9]. The 3D FeP-Pt film was grown on conductive carbon cloth (CC) by means of hydrothermal methods with high temperature phosphating and electro-deposition [5,7,8]. The results show FeP-Pt/CC has excellent electrocatalytic performances for HER at all pH and has excellent durability and long term stability
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