铁(Fe)基电催化剂的表面重构对有效的析氧反应(OER)至关重要。首先通过一步水热法在泡沫铁(IF)基底上制备了钌(Ru)、硫(S)共掺杂的四氧化三铁(Fe3O4)纳米片组装的纳米球花，随后通过电化学方法将S浸出，促进Fe3O4纳米片重构为FeOOH，形成IF基底上富含氧空位(Ov)的Ru掺杂FeOOH催化剂(Ru-FeOOH-Ov/IF)。FeOOH作为OER过程中的活性相，Ru掺杂和Ov的存在可以进一步提高其本征活性，促进了水(H2O)吸附和氧气(O2)气体释放。因此，获得的催化剂拥有优异的碱性电化学性能，在100和300 mA cm-2的电流密度下分别表现出270和311 mV的低过电位，以及300 h的长期电解稳定性。
Electrochemical reconstruction of Fe3O4 for efficient oxygen evolution reactions
Surface reconstruction of iron(Fe)based electrocatalysts is essential for efficient oxygen evolution(OER).In this paper,nano-spherules assembled by ruthenium(Ru)and sulfur(S)co-doped Ferric oxide(Fe3O4)nanosheets were prepared on foamy iron(IF)substrate by one-step hydrothermal method,and then S was leached by electrochemical method to promote the reconstruction of Fe3O4 nanosheets into FeOOH,form-ing the Ru-doped FeOOH catalysts(Ru-FeOOH-Ov/IF)with oxygen-rich vacancy(Ov)on the IF substrate.As the active phase in OER process,the presence of Ru doping and Ov can further enhance the intrinsic activity of FeOOH itself,which promoted the adsorption of water(H2O)and the release of oxygen(O2)gas.Therefore,the obtained catalyst had excellent alkaline electrochemical properties,showing low overpotential of 270 mV and 311 mV at current densities of 100 mA/cm2 and 300 mA/cm2,respectively,and long-term electrolytic sta-bility of 300 h.
metal oxideelectrochemical reconstructionoxygen evolution reactionoxygen vacancy
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