Stable Rhodium (IV) Oxide for Alkaline Hydrogen Evolution Reaction

Abstract

Water electrolysis in alkaline electrolyte is an attractive way toward clean hydrogen energy via the hydrogen evolution reaction (HER), whereas the sluggish water dissociation impedes the following hydrogen evolution. Noble metal oxides possess promising capability for catalyzing water dissociation and hydrogen evolution; however, they are never utilized for the HER due to the instability under the reductive potential. Here it is shown that compressive strain can stabilize RhO2 clusters and promote their catalytic activity. To this end, a strawberry‐like structure with RhO2 clusters embedded in the surface layer of Rh nanoparticles is engineered, in which the incompatibility between the oxide cluster and the metal substrate causes intensive compressive strain. As such, RhO2 clusters remain stable at a reduction potential up to −0.3 V versus reversible hydrogen electrode and present an alkaline HER activity superior to commercial Pt/C.

Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

“…The HER catalytic activity of the as-synthesized samples in alkaline solutions was also assessed. [27,28] Remarkably, to reach a current density of 10 mA cm À 2 , CoFeP@Ru exhibits a low overpotential of only 48 mV in 1.0 M KOH, much lower than that CoP@Ru (194 mV) (Figure 3d), comparable to most Ru-based HER electrocatalysts reported previously (Table S3). Meanwhile, the Tafel slope of CoFeP@Ru is 41 mV dec À 1 , smaller than that of Pt/C (39 mV dec À 1 ) and CoP@Ru (116 mV dec À 1 ) (Figure 3e).…”

Recent Advances of CeO2‐Based Electrocatalysts for Oxygen and Hydrogen Evolution as well as Nitrogen Reduction

“…by surface structure engineering, as good HER catalytic materials. [138][139][140][141] This undoubtedly indicates the potential of metal oxides in the field of electrocatalysis. At the same time, it is also possible to combine CeO 2 with metal oxides to further modulate the surface, interface structure and generate excellent hybrid catalysts for HER.…”

Laser Synthesis and Microfabrication of Micro/Nanostructured Materials Toward Energy Conversion and Storage

“…Liang et al [ 110 ] prepared Au-ZnO nanospheres with Au NPs in different particle size encapsulated in ZnO nanospheres through laser irradiation of the Au target and Zn target in liquid, respectively. Otherwise, Liu and Du et al reported the synthesis of RuAu single-atom alloys (SAAs) [ 111 ] and RhO 2 clusters embedded in the surface of Rh nanoparticles [ 112 ] by PLAL technique, the strong quenching effect played an important role in fabricating metastable nanostructures with novel properties (Fig. 8 a).…”