(544hh) Hierarchical, Titanium/Titania Electrocatalyst for Water Electrolysis

Authors: 
Taboada-Serrano, P., Rochester Institute of Technology
Li, X., Rochester Institute of Technology
Tsouris, C., Oak Ridge National Laboratory
This work proposes a metal-based catalyst that can potentially overcome the hurdles towards industrial-scale hydrogen production.
A titanium-based catalyst was fabricated via combining 3D printing and in-situ anodization in order to grow highly-ordered TiO2 nanotubes (NTs) onto a microporous 3D Ti-metal base as current collector. Micro-structure and nano-structure were carefully controlled during fabrication.
The performance of the reported 3D Ti/TiO2 electrocatalyst was tested for hydrogen-evolution reaction (HER) via water electrolysis. Onset potentials for HER as low as -45 mV vs. RHE were obtained for our electrodes making them competitive with current state-of-the-art. The proposed electroatalysts feature the following advantages: (1) the fabrication method for the 3D Ti/TiO2 composite is simple and scalable; (2) the 3D Ti/TiO2 composite features a flow-through architecture that not only enables more efficient utilization of the surface area of the catalyst but that could enable large-scale, continuous-flow hydrogen-production reactor technologies; and (3) minimization of electrical resistance between active surface area (TiO2 NTs) and current collector (Ti).