A porous MoO2 nanosheet as an active and stable bifunctional electrocatalyst for overall water splitting, is presented. It needs a cell voltage of only about 1.53 V to achieve a current density of 10 mA cm(-2) and maintains its activity for at least 24 h in a two-electrode configuration.

High-entropy alloys (HEAs), which are defined as near-equimolar alloys of five or more elements, are attracting ever increasing attention because of the unique properties in a variety of applications. Recently, HEAs have already exhibited remarkable catalytic performance toward several thermal-driven and electrocatalytic reactions. HEAs not only regulate the electronic and geometric structures to a large degree but also serve as a platform to construct catalysts with unexpected performance. Herein, recent advances regarding HEA-based catalysis are systematically summarized, with a special focus on the synthetic methods for HEA-based catalysts, catalytic performance, and mechanistic understanding. Moreover, the challenges and future opportunities for this research area are carefully discussed. A series of open questions and promising directions to be explored are proposed, including synthetic methods, regulation of electronic properties, identification of active centers, and applications into photocatalysis. This Review provides an overview about the progress, challenges, and opportunities for HEA-based catalysis.

Highly active and stable electrocatalysts for oxygen evolution reaction (OER) are required for industrial hydrogen production. Herein, we report Mo and Fe modification as a synergistic effect to enhance both activity and stability for OER. The Mo-and Fe-modified Ni(OH) 2 /NiOOH nanosheets needs an overpotential of only ∼280 mV to achieve a current density of 100 mA cm −2 and shows no evidence of degradation after 50 h at such high current density, outperforming all OER catalysts reported to date. This work may provide options for the design and preparation of promising OER electrocatalysts.

With the capability of inducing intense electromagnetic field, energetic charge carriers, and photothermal effect, plasmonic metals provide a unique opportunity for efficient light utilization and chemical transformation. Earth‐abundant low‐cost Cu possesses intense and tunable localized surface plasmon resonance from ultraviolet‐visible to near infrared region. Moreover, Cu essentially exhibits remarkable catalytic performance toward various reactions owing to its intriguing physical and chemical properties. Coupling with light‐harvesting ability and catalytic function, plasmonic Cu serves as a promising platform for efficient light‐driven chemical reaction. Herein, recent advancements of Cu‐based plasmonic photocatalysis are systematically summarized, including designing and synthetic strategies for Cu‐based catalysts, plasmonic catalytic performance, and mechanistic understanding over Cu‐based plasmonic catalysts. What's more, approaches for the enhancement of light utilization efficiency and construction of active centers on Cu‐based plasmonic catalysts are highlighted and discussed in detail, such as morphology and size control, regulation of electronic structure, defect and strain engineering, etc. Remaining challenges and future perspectives for further development of Cu‐based plasmonic catalysis are also proposed.

3D porous MoNi4 networks annealed at 450 °C need only ∼1.58 V to achieve 10 mA cm−2 for overall water splitting and exhibit excellent stability. A two-electrode device to split water with porous MoNi4 networks as bifunctional electrocatalysts can be driven by a single AA battery (1.5 V).