Flower-like MOF-74 nanocomposites directed by selenylation towards high-efficient oxygen evolution

Xin Zhang; Hongwei Pan; Yubao Jia; Yao Zhang; Zhigang Jiang; Chunjie Li; Xu Li; Lihong Bao; Ruguang Ma; Kuikui Wang

doi:10.1016/j.jcis.2022.04.181

Flower-like MOF-74 nanocomposites directed by selenylation towards high-efficient oxygen evolution

J Colloid Interface Sci. 2022 Oct:623:552-560. doi: 10.1016/j.jcis.2022.04.181. Epub 2022 May 6.

Authors

Xin Zhang¹, Hongwei Pan¹, Yubao Jia¹, Yao Zhang¹, Zhigang Jiang¹, Chunjie Li², Xu Li³, Lihong Bao⁴, Ruguang Ma⁵, Kuikui Wang⁶

Affiliations

¹ Institute of Materials for Energy and Environment, Laboratory of New Fiber Materials and Modern Textile, Growing Basis for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
² School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
³ Material Corrosion and Protection Key Laboratory of Sichuan Province, Zigong 643000, China.
⁴ College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China.
⁵ School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China. Electronic address: maruguang@mail.sic.ac.cn.
⁶ Institute of Materials for Energy and Environment, Laboratory of New Fiber Materials and Modern Textile, Growing Basis for State Key Laboratory, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China. Electronic address: kkwang@qdu.edu.cn.

PMID: 35598484
DOI: 10.1016/j.jcis.2022.04.181

Abstract

Sluggish kinetics of the oxygen evolution reaction during the water splitting requires high-performance electrocatalysts with low cost and good stability. Metal-organic frameworks (MOFs) have attracted much attention as electrocatalysts owing to their unique properties. To improve their electrocatalytic activity and stability, we report a selenylation method to modulate the morphology and interfaces by forming flower-like MOF-selenide nanocomposites. The optimal sample exhibits high activity with an overpotential of 260 mV at 10 mA cm^-2, much better than commercial RuO₂ and the control samples. Moreover, the optimal sample has the lowest Tafel slope of 54.3 mV dec^-1, indicating the fast reaction kinetics, which can be attributed to the lower charge-transfer resistance and high intrinsic activity. Chronoamperometry shows that the optimal sample can maintain the current density for 60 h at 10 mA cm^-2 after the initial surface reconstruction, demonstrating good stability. This study provides a new perspective on the development of highly efficient electrocatalysts based on polymetallic MOFs.

Keywords: Electrocatalysts; Metal-organic frameworks; Oxygen evolution reaction; Selenylation; Solvothermal reaction.