Discovery of Quantitative Electronic Structure-OER Activity Relationship in Metal-Organic Framework Electrocatalysts Using an Integrated Theoretical-Experimental Approach

Jian Zhou, Zhongkang Han, Xingkun Wang, Huiyu Gai, Zongkun Chen, Tong Guo, Xianbiao Hou, Liangliang Xu, Xiaojuan Hu, Minghua Huang, Sergey V. Levchenko, Heqing Jiang

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Developing cost-effective and high-performance catalysts for oxygen evolution reaction (OER) is essential to improve the efficiency of electrochemical conversion devices. Unfortunately, current studies greatly depend on empirical exploration and ignore the inherent relationship between electronic structure and catalytic activity, which impedes the rational design of high-efficiency OER catalysts. Herein, a series of bimetallic Ni-based metal-organic frameworks (Ni-M-MOFs, M = Fe, Co, Cu, Mn, and Zn) with well-defined morphology and active sites are selected as the ideal platform to explore the electronic-structure/catalytic-activity relationship. By integrating density-functional theory calculations and experimental measurements, a volcano-shaped relationship between electronic properties (d-band center and eg filling) and OER activity is demonstrated, in which the NiFe-MOF with the optimized energy level and electronic structure situated closer to the volcano summit. It delivers ultra-low overpotentials of 215 and 297 mV for 10 and 500 mA cm−2, respectively. The identified electronic-structure/catalytic activity relationship is found to be universal for other Ni-based MOF catalysts (e.g., Ni-M-BDC-NH2, Ni-M-BTC, Ni-M-NDC, Ni-M-DOBDC, and Ni-M-PYDC). This work widens the applicability of d band center and eg filling descriptors to activity prediction of MOF-based electrocatalysts, providing an insightful perspective to design highly efficient OER catalysts.

Original languageEnglish
Article number2102066
JournalAdvanced Functional Materials
Volume31
Issue number33
DOIs
Publication statusPublished - 16 Aug 2021

Keywords

  • d-band center
  • density-functional theory calculations
  • e filling electrons
  • metal-organic frameworks
  • oxygen evolution reaction

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