Abstract
Developing highly efficient low‐cost electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte is essential to advance water electrolysis technology. Herein, Ni(OH)2 nanoplates aligned on NiAl foil (Ni(OH)2/NiAl) are developed by simply dealloying NiAl foil in KOH, which exhibits high electrocatalytic activity for OER with a small overpotential of 289 mV to achieve 10 mA cm−2 and outstanding durability with no detectable degradation during long‐term operation. Furthermore, such Ni(OH)2/NiAl can effectively act as an active and robust hierarchical scaffold to simply electrodeposit other catalysts with intrinsically higher activity such as NiMo and NiFe nanoparticles for highly efficient HER and OER, respectively. The prepared NiFe/Ni(OH)2/NiAl displays superior OER catalytic activity with overpotentials of 246, 315, and 374 mV at 10, 100, and 500 mA cm−2, respectively. While NiMo/Ni(OH)2/NiAl catalyst exhibits remarkable HER performance with a small overpotential of 78 mV to deliver 10 mA cm−2. Consequently, the electrolysis device composed of the above two electrocatalysts demonstrates superb water splitting performance with a cell voltage of 1.59 V at 10 mA cm−2. These results open up opportunities to explore and optimize low‐cost advanced catalysts for energy applications.
Highlights
Introduction foroxygen evolution reaction (OER),[2] and transition metal sulfides, nitrides, selenides, phosphides, carbides, and borides for hydrogen evolution reaction (HER) have been reported.[3]Electrochemical water splitting is an efficient and promising Among those non-noble-metal electrocatalysts for OER, Ni(OH)2 technology for the production of high-purity hydrogen by as a typical transition metal hydroxides has received attention because of its high activity and stability
A series of Ni(OH)2 nanoplates on NiAl alloy foil were synthesized by soaking NiAl alloy foils in 5 m KOH at 95 °C for a couple of days, noted as Ni(OH)2/NiAl-n, where n represents the number of the days
Their morphologies were investigated by scanning electron microscopy (SEM)
Summary
Facile and Scalable Synthesis of Robust Ni(OH) Nanoplate Arrays on NiAl Foil as Hierarchical Active Scaffold for Highly Efficient Overall Water Splitting. The electrolysis device composed of the above two electrocatalysts demonstrates superb water splitting performance with a cell voltage of 1.59 V at 10 mA cm−2 These results open up opportunities to enhancing the energy conversion efficiency and lowering the production cost. Anode catalysts such as IrO2 and RuO2, and cathode catalysts such as Pt/C are traditionally used to promote OER and HER, respectively.[1] these catalysts suffered from low abundance and high cost, limiting the large-scale commercialization of water electrolysis. Electrochemical water splitting is an efficient and promising Among those non-noble-metal electrocatalysts for OER, Ni(OH) technology for the production of high-purity hydrogen by as a typical transition metal hydroxides has received attention because of its high activity and stability. Substantial progress has been achieved, the challenges still remain for the exploration of lowcost catalysts with superior activity and stability to noble metal counterparts, especially by the facile and scalable methods
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