Three-dimensional hierarchical porous nanotubes derived from metal-organic frameworks for highly efficient overall water splitting

Yang Wang, Shenlong Zhao, Yinlong Zhu, Ruosang Qiu, Thomas Gengenbach, Yue Liu, Lianhai Zu, Haiyan Mao, Huanting Wang, Jing Tang*, Dongyuan Zhao*, Cordelia Selomulya*
Iscience 23(1), (2020)


Effective design of bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is important but remains challenging. Herein, we report a three-dimensional (3D) hierarchical structure composed of homogeneously distributed Ni-Fe-P nanoparticles embedded in N-doped carbons on nickel foams (denoted as [email protected]/NF) as an excellent bifunctional catalyst. This catalyst was fabricated by an anion exchange method and a low-temperature phosphidation of nanotubular Prussian blue analogue (PBA). The [email protected]/NF displayed exceptional catalytic activity toward both HER and OER and delivered an ultralow cell voltage of 1.47 V to obtain 10 mA cm−2 with extremely excellent durability for 100 h when assembled as a practical electrolyser. The extraordinary performance of [email protected]/NF is attributed to the abundance of unsaturated active sites, the well-defined hierarchical porous structure, and the synergistic effect between multiple components. Our work will inspire more rational designs of highly active non-noble electrocatalysts for industrial energy applications.