3D Printing of Multiscale Ti64‐Based Lattice Electrocatalysts for Robust Oxygen Evolution Reaction

Abstract

Electrically assisted water splitting is an endurable strategy for hydrogen production, but the sluggish kinetics of oxygen evolution reaction (OER) extremely restrict the large-scale production of hydrogen. Developing highly efficient and non-precious catalytic materials is essential to accelerate the sluggish kinetics of OER. However, currently used catalyst supports, such as copper foam, suffer from inferior corrosion resistance and structural stability, resulting in the disabled functionality of 3D conductive networks. To this end, a novel 3D freestanding electrode with corrosion-resistant and robust Ti-6Al-4V titanium alloy lattice as the catalyst support is designed via a 3D printing technology of selective laser melting. After the coating of core-shell Cu(OH)2@CoNi carbonate hydroxides (CoNiCH) on the designed lattice, a unique micro/nano-sized hierarchical porous structure is formed, which endows the electrocatalyst with a promising electrocatalytic activity (a low overpotential of 355 mV at 30 mA cm −2 and Tafel slope of 125.3 mV dec −1 ). Computational results indicate that the CoNiCH exhibits optimized electron transfer and the catalytic activity of the Ni site is higher than that of the Co site in the CoNiCH. Therefore, the integration of robust catalyst supports and highly active materials opens up an avenue for reliable and high-performance OER electrocatalysts.

Robust and Corrosion‐Resistant Overall Water Splitting Electrode Enabled by Additive Manufacturing

“…[ 26 ] Upon comparison with the XRD and XPS spectra of recently reported Ni‐substituted Co carbonate hydroxide, the CoNiCH deposited on the Ti64‐S/Ni and Ti64‐H/Ni samples was identified as Co 0.8 Ni 0.2 (CO 3 ) 0.5 (OH)·0.11H 2 O. [ 16,22,23 ]…”

Recent Advances in Sustainable Catalysts and Catalysis with Non-noble Metals

“…20,21 Cobalt and nickel complexed as CoNi carbonate hydroxides (CoNiCH) and formed a core-shell structure [Cu(OH)2@CoNiCH] with Cu(OH)2 to perform the oxygen evolution reaction catalysis. 22 Copper, nickel, and phosphorus composites enable urea electrolysis as electrodes in the electrolysis cell. 23 Ruthenium dioxide (RuO2) and iridium oxide (IrO2) are used as references for non-noble metal-based catalysts research.…”

Recent Advances in Sustainable Catalysts and Catalysis with Non-noble Metals

“…20,21 Copper and nickel complexed as CoNi carbonate hydroxides and performed the oxygen evolution reaction catalysis. 22 Copper, nickel, and phosphorus composites enable urea electrolysis as electrodes in the electrolysis cell. 23 Ruthenium dioxide (RuO2) and iridium oxide (IrO2) are used as references for non-noble metal-based catalysts research.…”