Coordination modulation of iridium single-atom catalyst maximizing water oxidation activity

Single-atom catalysts (SACs) have attracted tremendous research interests in various energy-related fields because of their high activity, selectivity and 100% atom utilization. However, it is still a challenge to enhance the intrinsic and specific activity of SACs. Herein, we present an approach to fabricate a high surface distribution density of iridium (Ir) SAC on nickel-iron sulfide nanosheet arrays substrate (Ir1/NFS), which delivers a high water oxidation activity. The Ir1/NFS catalyst offers a low overpotential of ~170 mV at a current density of 10 mA cm−2 and a high turnover frequency of 9.85 s−1 at an overpotential of 300 mV in 1.0 M KOH solution. At the same time, the Ir1/NFS catalyst exhibits a high stability performance, reaching a lifespan up to 350 hours at a current density of 100 mA cm−2. First-principles calculations reveal that the electronic structures of Ir atoms are significantly regulated by the sulfide substrate, endowing an energetically favorable reaction pathway. This work represents a promising strategy to fabricate high surface distribution density single-atom catalysts with high activity and durability for electrochemical water splitting.

Ultralow Ru incorporated MoS2 nanosheet arrays for efficient electrocatalytic hydrogen evolution in dual-pH

The design of cheap yet effective electrocatalysts for hydrogen evolution reaction (HER) that can function over a wide pH range is highly desirable. In this work, ultralow Ru incorporated MoS2...

2D WO3 nanosheets for high-performance electrochromic-supercapacitor

In our article, 2D WO3 nanosheet arrays with (101) preferential orientation facets (WO3 NSHs) were successfully assembled on fluorine-doped tin oxide (FTO) electrode through a simple solvothermal method. The physicochemical...

Enhanced electrocatalytic activity of a layered triple hydroxide (LTH) by modulating the electronic structure and active sites for efficient and stable urea electrolysis

NiCoFe-LTH nanosheet arrays on a nickel foam substrate act as an efficient and stable electrocatalyst for urea electrolysis, which needs only 1.49 V for 10 mA cm−2.