The Research Team Instructed by Assistant Professor Yao Zhou and Professor Juntao Li From Institute of Chemical Energy Published Papers on ACS Catalysis
Time:2018-10-30   Visits:62

  Recently, Jiande Chen, the postgraduate instructed by Assistant Professor Yao Zhou and Professor Juntao Li, published a paper named “Interfacial Interaction between FeOOH and Ni-Fe LDH to Modulate the Local Electronic Structure for Enhanced OER Electrocatalysis (DOI: 10.1021/acscatal.8b03489) on ACS Catalysis.

  Hydrogen energy, as a kind of clean energy, has gained more and more attention. Water splitting which employs electricity converted from solar energy represents a promising approach to clean hydrogen energy. Its half reaction, oxygen evolution reaction (OER), is the rate-determining step due to its sluggish kinetics. Thus, it is a hot issue to pursue high-performance OER electrocatalysts.

  The research group synthesized FeOOH/LDH nanocomposites where numerous FeOOH NPs were stably anchored on the thin nanopetals of the hierarchically structured Ni-Fe LDH flowers via two methods. Particularly, the composite with average size of FeOOH/LDH NPs of 2.0 nm exhibited an overpotential of 174 mV at 10 mA·cm-2 and a tafel slope of 27 mV dec-1 in 1.0 M KOH. A mechanistic study based on XANES and EXAFS analysis, d.c. voltammetry and large amplitude Fourier Transformed a.c. voltammetry proved the presence of high-oxidation-state Fe(3+δ)+ sites with relatively short Fe(3+δ)+-O bond from the highly unsaturated ultrafine FeOOH NPs which could reform the local electronic structure and favorably manipulate the electronic oxidation and thus electrocatalytic behaviors of the Ni2+ species in the Ni-Fe LDH, hence leading to the easy formation, excellent OER activity, and extraordinary structural and catalytic stability. Their work puts an emphasis on the role of the solid-solid interfacial chemistry between a Ni-Fe LDH and a non-noble-metal component in engineering the local electronic structure of the active metal sites, which successfully pushed forward the catalytic activity of the well-studied Ni-Fe LDH far beyond its current limit in OER catalysis and opened up an avenue for rational design of OER electrocatalysts.

  The work us funded by the Ministry of Science and Technology (MOST) and Nation Nature Science Foundation of China (NSFC).