New catalyst cuts energy losses in hydrogen production from water
Researchers have engineered a composite material that dramatically improves the efficiency of splitting water into hydrogen fuel. The advance addresses a major cost barrier to green hydrogen—one of the most promising routes to decarbonizing heavy industry and long-distance transport.
Originaltitel: Tin Oxide-Anchored MXene Composites for Enhanced Hydrogen Evolution in Alkaline Media
Elektorkatisator av tinnioxid och MXen-komposit sänker energiförlusten vid vätgasproduktion via vattendelning — en central flaskhals för grön väteframställning. Forskarna vid Ca' Foscari-universitetet i Venedig utvecklade en hybriddstrukterad katalysator (SnMX40) genom termisk hydrolyses. Katalysatorn uppnår 72 mV överspänning vid 10 mA cm⁻², vilket överträffar komponentmaterialens prestanda separat. Den visar dessutom långlivsthet — 64 timmars drift utan prestandaförsämring enligt XRD- och TEM-analys. Den förbättrade aktiviteten förklaras av ökat antal aktiva platser och högre elektrisk ledningsförmåga i kompositen. Svenska Luleå tekniska universitet deltog i materialvetenskaplig analys. För leverantörer av elektrokatalysatorer och vätgasproducenter öppnar detta väg mot kostnadseffektivare systemer. Kommersialisering beror på skalbarhet av syntesmetoden och långtidsstabilitet i industriell miljö.
<p>Efficient hydrogen generation via water splitting has long been limited by substantial energy losses; however, advances in the engineering of high-performance electrocatalysts have helped to overcome this challenge. In recent years, constructing composite structures through the deliberate optimization of two complementary materials has emerged as an effective strategy for enhancing electrocatalytic activity. Guided by this approach, we developed a SnO2/MXene electrocatalyst for the hydrogen evolution reaction (HER) using a facile in situ hydrothermal synthesis. The resulting SnMX40 composite exhibits a low overpotential of 72 mV at a current density of 10 mA cm−2 and a small Tafel slope of 99 mV dec−1 in alkaline media, outperforming pristine SnO2 and MXene catalysts. Furthermore, the SnMX40 catalyst demonstrates excellent durability, maintaining stable performance for up to 64 h while preserving its structural integrity, as confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The enhanced HER performance is attributed to the abundance of active sites and improved electrical conductivity provided by the composite architecture.</p>