Construction of hierarchical FeNi_(3)@(Fe,Ni)S_(2) core-shell heterojunctions for advanced oxygen evolution
作者机构：Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of NanotechnologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Key Laboratory of Soil Environment and Pollution RemediationInstitute of Soil Sciencethe Chinese Academy of SciencesNanjing210008China Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2021年第14卷第11期
页 面：4220-4226页
核心收录：
学科分类：0808[工学-电气工程] 081704[工学-应用化学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学]
基 金：This work was jointly supported by the National Key Research and Development Program of China (Nos. 2017YFA0206500 and 2018YFA0209103) the National Natural Science Foundation of China (Nos. 52071174, 21832003, 21773111, and 21972061) the Fundamental Research Funds for the Central Universities (No. 020514380126) The numerical calculations have been done on the computing facilities in the High Performance Computing Center (HPCC) of Nanjing University. We thank the staff of the BL14W1 beamline at Shanghai Synchrotron Radiation Facility for assistance with the X-ray absorption measurements
主 题：oxygen evolution reaction electrocatalysts Ni-Fe nitrides core-shell structure heterojunctions
摘 要：The investigation of earth-abundant electrocatalysts for efficient water electrolysis is of central importance in renewable energy system, which is currently impeded by the large overpotential of oxygen evolution reaction (OER). NiFe sulfides show promising OER activity but are troubled by their low intrinsic conductivities. Herein, we demonstrate the construction of the porous core-shell heterojunctions of FeNi3@(Fe,Ni)S_(2) with tunable shell thickness via the reduction of hierarchical NiFe(OH)x nanosheets followed by a partial sulfidization. The conductive FeNi3 core provides the highway for electron transport, and the (Fe,Ni)S_(2) shell offers the exposed surface for in situ generation of S-doped NiFe-oxyhydroxides with high intrinsic OER activity, which is supported by the combined experimental and theoretical studies. In addition, the porous hierarchical morphology favors the electrolyte access and O_(2) liberation. Consequently, the optimized catalyst achieves an excellent OER performance with a low overpotential of 288 mV at 100 mA·cm^(−2), a small Tafel slope of 48 mV·dec^(−1), and a high OER durability for at least 1,200 h at 200 mA·cm^(−2). This study provides an effective way to explore the advanced earth-abundant OER electrocatalysts by constructing the heterojunctions between metal and corresponding metal-compounds via the convenient post treatment, such as nitridation and sulfidization.
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