4.4 Article

Self-Supported Phosphorus-Doped Vertically Aligned Graphene Arrays Integrated with FeCoNiP Nanoparticles as Bifunctional Electrocatalysts for Water-Splitting Over a Wide pH Range

Journal

ELECTRONIC MATERIALS LETTERS
Volume 17, Issue 1, Pages 87-101

Publisher

KOREAN INST METALS MATERIALS
DOI: 10.1007/s13391-020-00260-x

Keywords

FeCoNiP; Phosphorus-doped vertically aligned graphene arrays; Electrocatalyst; Overall water splitting

Funding

  1. National Natural Science Foundation of China [21902127]

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The study successfully synthesized a self-supported bifunctional electrocatalyst with high catalytic activity and long-term stability in a wide pH range, offering potential applications in water splitting.
Self-supported non-noble metal based bifunctional electrocatalysts with high catalytic activity and long-term stability in a wide pH range are highly essential for the production of hydrogen and oxygen, remains a great challenge. Herein, a bifunctional electrocatalyst is synthesized via electroless plating of FeCoNiP nanoparticles on self-supported phosphorus-doped vertically aligned graphene arrays (FeCoNiP/P-VG). FeCoNiP/P-VG exhibits an exceptionally high catalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in a wide pH range, with an overpotential of 81 and 141 mV for HER, and 240 and 409 mV for OER, in 1.0 M KOH and 0.5 M H2SO4 respectively, at current density of 10 mA. It also performs quite low Tafel slope value of 40 mV.dec(-1) for HER and 69 mV.dec(-1) for OER in 1.0 M KOH. More importantly, it shows prominent stability in acidic and alkaline electrolytes. This study may open a new avenue for the design and fabrication of self-supported bifunctional electrocatalysts for water splitting.

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