Release time:2024-01-19  Hits:

• Key Words:HYDROGEN EVOLUTION REACTION; TANNIC-ACID; NANOSHEETS; EFFICIENT; COPPER
• Abstract:Constructing highly efficient and stable electrocatalysts is the key to reducing the overall energy input for electrocatalytic water splitting, which ensures the reduced cost of environmentally friendly hydrogen re-sources with high energy density. Assisted by ultrafast pyrolysis with a flash Joule heating technique, CuRu ultrasmall alloy nanoparticles are uniformly coated on carbon nanotubes (CNTs) with tannic acid (TA) to chelate metal ions. During the pyrolysis procedure, the self-assembled TA molecules not only offer a cross -linked porous polyphenol framework but also provide more interactions to link the alloy nanoparticles and CNT substrates, forming highly conductive electrocatalysts with uniformly dispersed ultrasmall alloy me-tallic nanoparticles (similar to 4.3 nm in diameter) on the surface of porous CNTs (CuRu-CNTs). In particular, CuRu-CNTs with Cu-Ru alloy nanoparticles achieve the highest electrochemical activity, exhibiting tiny HER and OER overpotential of 39 mV and 330 mV at 10 mA cm-2 in 1.0 M KOH medium. The unique bifunctional feature of CuRu-CNTs allows good overall water splitting activity (10 mA cm-2 for 12 h), which is com-parable with the best noble metal-based benchmark. This contribution provides a general energy saving pyrolysis method for the preparation of highly efficient, cost-effective and chemically stable electrocatalysts for water splitting. (c) 2022 Published by Elsevier B.V.
• Volume:936
• Issue:
• Translation or Not:no