期刊
ADVANCED MATERIALS
卷 30, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804333
关键词
perovskites; plasma; surface reconstruction; water splitting
类别
资金
- National Nature Science Foundation of China [21576135]
- Jiangsu Natural Science Foundation for Distinguished Young Scholars [BK20170043]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Program for Changjiang Scholars
- Program for Jiangsu Specially Appointed Professors
- Youth Fund in Jiangsu Province [BK20150945]
- Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials
The development of efficient bifunctional electrodes with extraordinary mass activity and robust stability is an eternal yet challenging goal for the water-splitting process. Surface reconstruction during electrocatalysis can form fresh-composition electrocatalysts with unusual amorphous phases in situ, which are more active but difficult to prepare by conventional methods. Here, a facile strategy based on fast reconstruction of amorphous nanofilm precursors is proposed for exploring precious-metal-free catalysts with good electronic conductivity, ultrahigh activity, and robust stability. As a proof of concept, an amorphous SrCo0.85Fe0.1P0.05O3- (SCFP) nanofilm precursor with weak chemical bonds deposited onto a conductive nickel foam (NF) substrate (SCFP-NF) is synthesized by utilizing a high-energy argon plasma to break the strong chemical bonds in a crystalline SCFP target. The quickly reconstructed SCFP-NF bifunctional catalysts show ultrahigh mass activity of up to 1000 mA mg(-1) at an overpotential of 550 mV and extremely long operational stability of up to 650 h at 10 mA cm(-2), significantly overperforming state-of-the-art precious-metal catalysts. Such a strategy is further demonstrated to be a universal method, which can be applied to accelerate the reconstruction of other material systems to obtain various efficient electrocatalysts.
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