Observation of a robust and active catalyst for hydrogen evolution under high current densities

Abstract

Despite the fruitful achievements in the development of hydrogen production catalysts with record-breaking performances, there is still a lack of durable catalysts that could work under large current densities (>1000 mA cm−2). Here, we investigated the catalytic behaviors of Sr2RuO4 bulk single crystals. This crystal has demonstrated remarkable activities under the current density of 1000 mA cm−2, which require overpotentials of 182 and 278 mV in 0.5 M H2SO4 and 1 M KOH electrolytes, respectively. These materials are stable for 56 days of continuous testing at a high current density of above 1000 mA cm−2 and then under operating temperatures of 70 °C. The in-situ formation of ferromagnetic Ru clusters at the crystal surface is observed, endowing the single-crystal catalyst with low charge transfer resistance and high wettability for rapid gas bubble removal. These experiments exemplify the potential of designing HER catalysts that work under industrial-scale current density.

Leveraging Metal Nodes in Metal–Organic Frameworks for Advanced Anodic Hydrazine Oxidation Assisted Seawater Splitting

“…These results demonstrate the great potential of NiRh 0.016 -BDC for practical applications. Furthermore, as shown in Figure d, NiRh 0.016 -BDC shows a TOF of 1.585 s –1 at an overpotential of 100 mV, which is much higher than that of Ni-BDC (0.004 s –1 ) and Pt/C (0.377 s –1 ) under the same conditions, confirming the superior intrinsic activity for NiRh 0.016 -BDC …”

Suppression of Oxygen Vacancies in Rutile Ruo2 via In Situ Exsolution for Enhanced Water Electrocatalysis

“…Iso‐surface plotting of the charge‐density difference (Figure 1d and Figure S3a, Supporting Information) and plane‐averaged charge‐density difference along the z ‐direction (Figure 1e and Figure S3b, Supporting Information) suggest strong charge depletion around the Sr atoms and the charge accumulation at the Ru and O atoms in RuO 2 . [ 27 ] The charge redistribution and the increased filling of O 2p orbital could upshift the Fermi level and weaken the p–d hybridization. This will decrease the covalency of the metal‐oxygen bonds (RuO), which is beneficial for the suppression of lattice oxygen activities.…”

Recent Advances in Perovskite Oxides Electrocatalysts: Ordered Perovskites, Cations Segregation and Exsolution

“…The above process occurs concurrently with B-site segregation and can further modify the electronic and structural properties of the perovskite. Among the B-site cations of perovskites, precious metals (e. g., Ru, Rh, Pd, and Pt [80][81][82] ) and transition metals (e. g., Fe, Co, and Ni [83] ) have high reactivity and are easily reduced in reduction conditions, making them ideal for forming metal NPs on the surface. The ratio of A and B atoms in the stoichiometry of perovskites can also significantly impact the exsolution behavior of B-site cations.…”