期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 51, 页码 47858-47867出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13834
关键词
surface reconstruction; La0.8Sr0.2Co0.8Fe0.2O3-delta; oxygen evolution reaction (OER); amorphous layer; nanosized
资金
- Natural Science Foundation of Shanghai [19NR1413000, 13ZR1411900]
- Shanghai Alliance Plan [LM201881, LM201751]
- Shanghai Leading Academic Discipline Project [B502]
- Shanghai Key Laboratory Project [08DZ2230500]
Perovskites have become important OER electrocatalysts. Herein, as-prepared La0.8Sr0.2Co0.8Fe0.2O3-delta (LSCF-0) is chosen as a sample to exhibit the superimposed effect of surface reconstruction accompanied by reduction of Co3+ to Co2+ on the further improvement of its activity and stability. As-synthesized LSCF-0 perovskite is chemically treated by simply immersing in an aqueous solution of NaBH4 for 1.0 h at room temperature. The optimized LSCF (LSCF-2) owns an amorphous layer consisting of nanosized particles of similar to 20 nm (vs smooth bulk crystalline surface for untreated LSCF), which exhibits superior OER performance to LSCF-0. LSCF-2 has an overpotential of 248 mV (10 mA cm(-2)) and a Tafel slope of 51 mV dec(-1) (vs 355 mV and 76 mV dec(-1) for LSCF-0 and 381 mV and 91 mV dec(-1) for LCO) and an excellent cycle stability for 20 h running. This work supplies a new strategy to enhance OER performance through surface reconstruction of as-prepared perovskites.
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