Highly Electroactive Ni Pyrophosphate/Pt Catalyst toward Hydrogen Evolution Reaction

作者：Jayaraman Theerthagiri, Eduardo S. F. Cardoso, Guilherme V. Fortunato, Gleison Antônio Casagrande, Baskar Senthilkumar, Jagannathan Madhavan, Gilberto Maia · 发表于：ACS Applied Materials & Interfaces · 年份：2019 · DOI：10.1021/acsami.8b18153 · 被引用次数：97 · 研究领域：Electrocatalysts for Energy Conversion、Advanced battery technologies research、Fuel Cells and Related Materials

Robust electrocatalysts toward the resourceful and sustainable generation of hydrogen by splitting of water via electrocatalytic hydrogen evolution reaction (HER) are a prerequisite to realize high-efficiency energy research. Highly electroactive catalysts for hydrogen production with ultralow loading of platinum (Pt) have been under exhaustive exploration to make them cutting-edge and cost-effectively reasonable for water splitting. Herein, we report the synthesis of hierarchically structured nickel pyrophosphate (β-Ni 2 P 2 O 7 ) by a precipitation method and nickel phosphate (Ni 3 (PO 4 ) 2 ) by two different synthetic routes, namely, simple cost-effective precipitation and solution combustion processes. Thereafter, Pt-decorated nickel pyrophosphate and nickel phosphate (β-Ni 2 P 2 O 7 /Pt and Ni 3 (PO 4 ) 2 /Pt) were prepared by using potassium hexachloroplatinate and ascorbic acid. The fabricated novel nickel pyrophosphate and nickel phosphate/Pt materials were utilized as potential and affordable electrocatalysts for HER by water splitting. The detailed electrochemical studies revealed that the β-Ni 2 P 2 O 7 /Pt (1 μg·cm –2 Pt) electrocatalyst showed excellent electrocatalytic performances for HER in acidic solution with an overpotential of 28 mV at −10 mA·cm –2, a Tafel slope of 32 mV·dec, and an exchange current density ( j 0 ) of −1.31 mA·cm –2, which were close to the values obtained using the Vulcan/Pt (8.0 μg·cm –2 Pt), commercial benchmarking electrocatalyst wit...