Rational Design of Cobalt–Iron Selenides for Highly Efficient Electrochemical Water Oxidation,ACS Applied Materials & Interfaces

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Rational Design of Cobalt–Iron Selenides for Highly Efficient Electrochemical Water Oxidation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsami.7b08917
Jun-Ye Zhang ₁ , Lin Lv ₁ , Yifan Tian ₁ , Zhishan Li ₁ , Xiang Ao ₁ , Yucheng Lan ₂ , Jianjun Jiang ₁ , Chundong Wang ₁

Affiliation

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 Co_1–xFe_xSe₂ catalysts on nickel foams for oxygen evolution reactions (OERs) and disclose the relationship between the electronic structures of Co_1–xFe_xSe₂ (via regulating the atom ratio of Co/Fe) and their OER performance. Owing to the fact that the electron configuration of the Co_1–xFe_xSe₂ compounds can be tuned by the incorporated Fe species (electron transfer and lattice distortion), the catalytic activity can be adjusted according to the Co/Fe ratios in the catalyst. Moreover, the morphology of Co_1–xFe_xSe₂ is also verified to strongly depend on the Co/Fe ratios, and the thinner Co_0.4Fe_0.6Se₂ nanosheets are obtained upon selenization treatment, in which it allows more active sites to be exposed to the electrolyte, in turn promoting the OER performance. The Co_0.4Fe_0.6Se₂ nanosheets not only exhibit superior OER performance with a low overpotential of 217 mV at 10 mA cm^–2 and a small Tafel slope of 41 mV dec^–1 but also possess ultrahigh durability with a dinky degeneration of 4.4% even after 72 h fierce water oxidation test in alkaline solution, which outperforms the commercial RuO₂ catalyst. As expected, the Co_0.4Fe_0.6Se₂ nanosheets have shown great prospects for practical applications toward water oxidation.

中文翻译：

高效电解水氧化钴-硒化铁的合理设计

对于面向低碳经济的大规模工业应用，非常需要探索活性，稳定，富含地球，低成本和高效的电催化剂。在这项研究中，我们应用一种通用的硒化技术，在泡沫镍上合成富硒的Co ₁ – _x Fe _x Se ₂催化剂，用于析氧反应（OER），并揭示了Co _{1– x} Fe _x Se的电子结构之间的关系。₂（通过调节Co / Fe的原子比）及其OER性能。由于Co _{1– x} Fe _x Se ₂的电子构型可以通过掺入的Fe种类（电子转移和晶格畸变）来调节化合物的含量，可以根据催化剂中Co / Fe的比例来调节催化活性。此外，还证实了Co _{1– x} Fe _x Se ₂的形态在很大程度上取决于Co / Fe的比率，并且在硒化处理后获得了更薄的Co _0.4 Fe _0.6 Se ₂纳米片，其中允许更多的活性位点形成。暴露在电解质中，进而提高了OER性能。Co _0.4 Fe _0.6 Se ₂纳米片不仅表现出卓越的OER性能，而且在10 mA cm时具有217 mV的低过电势^–2和41fV dec ^-1的小Tafel斜率，但即使在碱性溶液中经过72 h的激烈水氧化试验后，也具有4.4％的丁基变性，具有超高的耐久性，其性能优于商用RuO ₂催化剂。不出所料，Co _0.4 Fe _0.6 Se ₂纳米片在水氧化的实际应用中显示了广阔的前景。

更新日期：2017-09-20

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