Environmental friendly synthesis of hierarchical mesoporous platinum nanoparticles templated by fucoidan biopolymer for enhanced hydrogen evolution reaction

doi:10.1016/j.jmst.2020.01.036

Abstract

Abstract:

Researching novel hydrogen evolution reaction (HER) catalysts with enhanced electrocatalytic activity, excellent stability, and cost-efficiency is of great significance for the large-scale hydrogen production from industrial electrolysis technology. We report the preparation of hierarchical mesoporous-Pt nanoparticles (HM-PtNPs) with coral-like rough surface morphologies using environmental friendly and biocompatible fucoidan (Fu) biopolymer as a surface engineering compound and its application to electrocatalysts for water-splitting. The designed HM-PtNPs yields better mass activity of electrocatalysts compared to a commercial Pt/C. HM-PtNPs showed an overpotential of 33 mV at 10 mA cm^-2 for the HER in 0.5 M H₂SO₄, which was highly comparable to that of the commercial Pt/C catalysts (29 mV). However, the amount of HM-PtNPs loaded in glassy carbon electrode (0.033 mg mL^-1) was approximately 20 times lower than that of the commercial Pt/C (0.64 mg mL^-1. The HM-PtNPs also maintained high catalytic stability with a consistent HER current density after 1000 continuous operation. The excellent HER performance is attributed to the improved electrochemical surface area, highly porous structure, and good surface wettability of the HM-PtNPs, which results in enhanced electrocatalytic activity, decreased resistance at the electrode/electrolyte interface, and facile penetration of the electrolytes inside the electrode.

Key words: Mesoporous, Fucoidan, Biopolymer, Low Pt content, Hydrogen evolution reaction

Seung Man Lim, Kyunglee Kang, Hongje Jang, Jung Tae Park. Environmental friendly synthesis of hierarchical mesoporous platinum nanoparticles templated by fucoidan biopolymer for enhanced hydrogen evolution reaction[J]. J. Mater. Sci. Technol., 2020, 46: 185-190.

Figures/Tables 7

Scheme 1. Reaction scheme of synthesis of hierarchical mesoporous-Pt nanoparticles (HM-PtNPs).

Fig. 1. TEM images of (a) HM-PtNPs, (b) high-magnified HM-PtNPs, and (c) N-PtNPs, respectively.

Fig. 2. Extinction of catalysts depending on the wavelength of HM-PtNPs, N-PtNPs, and Fu aqueous solution.

Fig. 3. Non iR-corrected LSV curves of HM-PtNPs, N-PtNPs, commercial Pt/C, and carbon black, b Tafel plots obtained from LSV curves of HM-PtNPs, N-PtNPs, and commercial Pt/C, c Tafel plots obtained from LSV curves of carbon black, and d LSV curves of HM-PtNPs before and after accelerated degradation 1000 CV catalytic cycles, respectively.

Fig. 4. (a) EIS spectra at a frequency range from 100 kHz to 0.1 Hz with a 5 mV amplitude of HM-PtNPs, N-PtNPs, commercial Pt/C, and carbon black and (b) Equivalent circuit diagram, respectively.

Fig. 5. CV cycles with a potential range from 0.1 V to 1.2 V vs. RHE at a scan rate of 50 mV s-1 of (a) HM-PtNPs, (b) N-PtNPs, and (c) commercial Pt/C. The dot square inset of (a) indicate H-UPD desorption region used as determining the ECSA.

Fig. 6. Images of the water contact angle on the conducting side of the FTO substrate with(a) HM-PtNPs, (b) N-PtNPs, and (c) commercial Pt/C coating, respectively.

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