Improving the Oxygen Evolution Activity of Layered Double‐Hydroxide via Erbium‐Induced Electronic Engineering

Small - Tập 19 Số 5 - 2023
Yu Zhu1, Xuan Wang1, Xiaoheng Zhu1, Zixin Wu1, Dongsheng Zhao1, Fei Wang2, Dongmei Sun1, Yawen Tang1, Hao Li3, Gengtao Fu1
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China
2Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin 300130, P.R. China
3Advanced Institute for Materials Research (WPI‐AIMR) Tohoku University Sendai 980‐8577 Japan

Tóm tắt

AbstractLayered double‐hydroxide (LDH) has been considered an important class of electrocatalysts for the oxygen evolution reaction (OER), but the adsorption‐desorption behaviors of oxygen intermediates on its surface still remain unsatisfactory. Apart from transition‐metal doping to solve this electrocatalytic problem of LDH, rare‐earth (RE) species have sprung up as emerging dopants owing to their unique 4f valence‐electronic configurations. Herein, the Er is chosen as a RE model to improve OER activity of LDH via constructing nickel foam supported Er‐doped NiFe‐LDH catalyst (Er‐NiFe‐LDH@NF). The optimal Er‐NiFe‐LDH@NF exhibits a low overpotential (191 mV at 10 mA cm−2), high turnover frequency (0.588 s−1), and low activation energy (36.03 kJ mol−1), which are superior to Er‐free sample. Electrochemical in situ Raman spectra reveal the facilitated transition of Ni‐OH into Ni‐OOH for promoted OER kinetics through the Er doping effect. Theoretical calculations demonstrate that the introduction of Er facilitates the spin crossover of valence electrons by optimizing the d band center of NiFe‐LDH, which leads to the GO‐GHO closer to the optimal activity of the kinetic OER volcano by balancing the bonding strength of *O and *OH. Moreover, the Er‐NiFe‐LDH@NF presents high practicability in electrochemical water‐splitting devices with a low driving potential of and a well‐extended driving period.

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Small

Tập 19 Số 5

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