絞り込み

16640

広告

Smart Control of Composition for Double Perovskite Electrocatalysts toward Enhanced Oxygen Evolution Reaction.

著者 Sun H , Xu X , Chen G , Zhou Y , Lin HJ , Chen CT , Ran R , Zhou W , Shao Z
ChemSusChem.2019 Sep 17 ; ():.
この記事をPubMed上で見るPubMedで表示
この記事をGoogle翻訳上で見る Google翻訳で開く

スターを付ける スターを付ける     (3view , 0users)

Full Text Sources

Miscellaneous

Double perovskites have emerged as efficient candidates for catalyzing for the electrochemical oxygen evolution reaction (OER). This work reports how smart control of composition for B-site ordered double perovskite can lead to improved catalytic performance. By adopting a facile co-doping strategy, the OER-active elements are introduced simultaneously into the B-site and B'-site of the B-site ordered double perovskite (A 2 BB'O 6 ), leading to enhanced exposed reactive sites and an optimum surface chemical state. As a result, a model system built from substitution of Co for Mo and Fe in the Sr 2 FeMoO 6-δ double perovskite (with a composition of Sr 2 Fe 0.8 Co 0.2 Mo 0.6 Co 0.4 O 6-δ ) shows significantly enhanced OER activity in alkaline media compared to the host material, requiring an overpotential of 345 mV to reach a 10 mA cm -2 current density (catalyst loading: ~ 0.232 mg cat cm -2 GEO ) and a cell voltage of 1.57 V to afford the same current density for the overall water splitting when coupled with a Pt/C cathode (catalyst loading: ~ 2 mg cm -2 ). Additionally, it also demonstrates excellent electrochemical stability. The generalizability of the compositional control methodology has also been demonstrated in double perovskites incorporating transition metals beyond Co (e.g., Ni).
PMID: 31529674 [PubMed - as supplied by publisher]
印刷用ページを開く Endnote用テキストダウンロード