Rational Design of Cobalt–Iron Selenides for Highly Efficient Electrochemical Water Oxidation

• DOI: 10.1021/acsami.7b08917
• Publication Date: 2017-08-29T10:43:29Z
• Authors: Jun-Ye Zhang; Lin Lv; Yifan Tian; Zhishan Li; Xiang Ao; Yucheng Lan; Jianjun Jiang; Chundong Wang
• Keywords: Rational design

Exploring active, stable, earth-abundant, low-cost, and high-efficiency electrocatalysts is highly desired for large-scale industrial applications toward the low-carbon economy. In this study, we apply a versatile selenizing technology to synthesize Se-enriched Co1–xFexSe2 catalysts on nickel foams oxygen evolution reactions (OERs) disclose relationship between electronic structures of (via regulating atom ratio Co/Fe) their OER performance. Owing fact that electron configuration compounds can be tuned by incorporated Fe species (electron transfer lattice distortion), catalytic activity adjusted according Co/Fe ratios in catalyst. Moreover, morphology also verified strongly depend ratios, thinner Co0.4Fe0.6Se2 nanosheets are obtained upon selenization treatment, which it allows more active sites exposed electrolyte, turn promoting The not only exhibit superior performance with low overpotential 217 mV at 10 mA cm–2 small Tafel slope 41 dec–1 but possess ultrahigh durability dinky degeneration 4.4% even after 72 h fierce water oxidation test alkaline solution, outperforms commercial RuO2 As expected, have shown great prospects practical oxidation.