Acid-stable bimetallic phosphide-silver core-shell nanowires with a seamlessly conductive network for enhanced hydrogen evolution reaction

Hydrogen production through proton exchange membrane water electrolysis is a crucial step toward sustainable energy solutions. However, the development of cost-effective and efficient electrocatalysts that can withstand acidic conditions remains a significant challenge. Traditional non-noble metal catalysts often fall short in performance and durability when exposed to harsh acidic environments.

Researchers at Beijing University of Technology have developed a new type of acid-stable bimetallic phosphide-silver core-shell nanowire catalyst that significantly improves the efficiency of the hydrogen evolution reaction (HER)，which was published in Frontiers in Energy

The study introduces a novel catalyst composed of nickel-cobalt phosphide (NiCoP) wrapped around silver nanowires (Ag NWs) to create a seamless, conductive core-shell structure. This innovative design facilitates efficient electron transfer and increases the surface area accessible to electrolytes, provides a large electrolyte-accessible surface area for mass transport，which enhance the HER efficiency. The NiCoP@Ag NWs catalyst shows remarkable performance with a low overpotential of 109 mV at a current density of 10 mA/cm², outperforming other similar catalysts, such as Ni₂P@Ag NWs and Co₂P@Ag NWs, which require higher overpotentials of 144 mV and 174 mV, respectively. The catalyst also demonstrated excellent durability, maintaining performance for over 100 hours in acidic media.

The researchers employed a synthesis process that creates a seamlessly conductive core-shell structure by wrapping acid-stable bimetallic phosphide (NiCoP) around silver nanowires. This method ensures the creation of a consistently conductive network that optimizes electron flow and enhances the catalytic activity of the material.

This research could revolutionize hydrogen production by providing a more efficient and durable catalyst for HER in acidic conditions. The findings have potential implications for the industrialization of hydrogen production, offering a pathway to more sustainable and cost-effective energy solutions. The enhanced durability and performance of the NiCoP@Ag NWs catalyst could lead to significant advancements in clean energy technologies, possibly influencing future policies and industrial practices in hydrogen production.