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A Composite Catalyst Based on Perovskites for Overall Water Splitting in Alkaline Conditions
Author(s) -
Bu Yunfei,
Kim Seona,
Kwon Ohhun,
Zhong Qin,
Kim Guntae
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801775
Subject(s) - bifunctional , catalysis , oxygen evolution , carbonization , materials science , water splitting , composite number , chemical engineering , perovskite (structure) , alloy , nanoparticle , carbon fibers , electrochemistry , inorganic chemistry , nanotechnology , composite material , chemistry , photocatalysis , organic chemistry , scanning electron microscope , electrode , engineering
Electrochemical water splitting is considered a sustainable way to produce H 2 . 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 (Nd 0.6 Sr 0.4 ) 3 ((Co,Fe) 0.85 Nb 0.15 ) 2 O 7 , metal sulfides, and hollow S‐doped carbon fibers. Compared to the untreated catalyst, Nd 0.6 Sr 0.4 Co 0.6 Fe 0.3 Nb 0.1 O 3‐ 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.