Bifunctional Pt-Ni Electrocatalyst Synthesis with Ultralow Platinum Seeds for Oxygen Evolution and Reduction in Alkaline Medium

Melina Zysler, Victor Shokhen, Samuel Spencer Hardisty, Anya Muzikansky, David Zitoun

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

Pt-Ni polyhedral nanoparticles (NPs) are extensively studied as electrocatalysts, mainly for oxygen reduction reaction (ORR), but they display a poor activity for the oxygen evolution reaction (OER). Here, ultralow platinum Pt@Ni@Pt core-bishell nanorods were designed (less than 1 wt % of Pt), synthesized, and characterized to yield bifunctional electrocatalysts with high efficiency toward ORR and OER in alkaline media. Ultralow platinum Pt@Ni@Pt core-bishell nanorods achieve an unprecedented (for a Pt-based catalyst) overpotential of 0.29 V at 10 mA cm-2and current density of 162 mA μg-1Ptat 1.6 V (vs RHE) for the OER, while still maintaining a very decent value of 0.32 A mg-1Ptat 0.85 V for the ORR. These values outperform the standard Pt catalyst for the ORR and the Ni catalyst for the OER, using less than 1 wt % Pt. We describe the two-step synthesis of the Pt@Ni@Pt nanorods, demonstrating the adjustment of their structural properties by a combination of dimethylformamide (DMF) and benzyl alcohol in a solvothermal reaction. We found that the solvent ratio controls the Pt-core size, Ni-shell thickness, and morphology. The combination of high performance and structure control via synthesis makes Pt@Ni@Pt nanorods promising candidates for further applications and opens a door for their further investigation.

اللغة الأصليةالإنجليزيّة
الصفحات (من إلى)4212-4220
عدد الصفحات9
دوريةACS Applied Energy Materials
مستوى الصوت5
رقم الإصدار4
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 25 أبريل 2022

All Science Journal Classification (ASJC) codes

  • !!Chemical Engineering (miscellaneous)
  • !!Energy Engineering and Power Technology
  • !!Electrochemistry
  • !!Electrical and Electronic Engineering
  • !!Materials Chemistry

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