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Facile solvothermal synthesis of Pt₇₆Co₂₄ nanomyriapods for efficient electrocatalysis

Jiang, Liu-Ying, Huang, Xian-Yan, Wang, Ai-Jun, Li, Xin-Sheng, Yuan, Junhua, Feng, Jiu-Ju
Journal of materials chemistry A 2017 v.5 no.21 pp. 10554-10560
active sites, catalysts, catalytic activity, durability, electrochemistry, energy, glutamic acid, hydrogen production, nanoparticles, quaternary ammonium compounds, reducing agents, surface area
Despite increasing research studies in the past few decades, it is still a challenge to find highly efficient catalysts for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). Herein, a one-pot solvothermal method was developed for constructing Pt₇₆Co₂₄ nanomyriapods (NMs) with abundant active sites, where l-glutamic acid and cetyltrimethylammonium chloride (CTAC) were used as the green reductant and structure directing agent, respectively. The architecture had a larger electrochemically active surface area (ECSA) of 24.49 m² g⁻¹ than Pt₄₉Co₅₁ nanoparticles (NPs, 15.17 m² g⁻¹), Pt₈₀Co₂₀ NPs (16.71 m² g⁻¹) and commercial Pt black (20.35 m² g⁻¹), and exhibited superior catalytic performances for ORR and HER. The mass activity of Pt₇₆Co₂₄ NMs (105.26 mA mgPₜ⁻¹) for ORR was twice as high as Pt black (47.35 mA mgPₜ⁻¹). And the Pt₇₆Co₂₄ NM catalyst exhibited better durability in acid media relative to Pt black and/or Pt/C (20 wt%). This work would have practical applications in catalysis, and energy storage and conversion.