A Composite Catalyst Based on Perovskites for Overall Water Splitting in Alkaline Conditions

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Electrochemical water splitting is considered a sustainable way to produce H2. However, it is still a challenge to develop efficient and stable electrocatalysts. Here, a bifunctional composite catalyst for the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) was constructed by using a facile in situ growth route, which combines the carbonization on exsolved alloy nanoparticles and sulfurization in one continues step. This composite catalyst contains Ruddlesden‐Popper‐type S‐adsorbed (Nd0.6Sr0.4)3((Co,Fe)0.85Nb0.15)2O7, metal sulfides, and hollow S‐doped carbon fibers. Compared to the untreated catalyst, Nd0.6Sr0.4Co0.6Fe0.3Nb0.1O3‐δ, the composite catalyst leads to significantly enhanced OER and HER activities as well as excellent stability (more than 400 h without inactivation) during overall water splitting. Our research offers a new route to fabricate hetero‐architecture materials with S‐doped hollow carbon fibers on alloy nanoparticles of perovskite oxides.