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Heterometallic Feed Ratio‐Dominated Oxygen Evolution Activity in Self‐Supported Metal‐Organic Framework Nanosheet Arrays Electrocatalyst
Author(s) -
Li RuiJie,
Qi YuFeng,
Wang Qian,
Wang JiaJun,
Liu ZhengYu,
Wang XiuGuang,
Zhao XiaoJun,
Yang EnCui
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000121
Subject(s) - tafel equation , oxygen evolution , overpotential , nanosheet , electrocatalyst , materials science , water splitting , chemical engineering , nickel , electrochemistry , metal organic framework , metal , nanotechnology , catalysis , chemistry , metallurgy , electrode , organic chemistry , adsorption , engineering , photocatalysis
Developing earth‐abundant, highly active and long‐term durable electrocatalysts for oxygen evolution reaction (OER) is highly desirable and great challenging for large‐scale industrial application of electrochemical water splitting. Herein, in‐situ growth of uniform nanosheet arrays on nickel foam (NF) is hydrothermally achieved by varying feed ratios of Fe III and Ni II salts. The feed ratio of the two active metals has significantly dominated both the morphological and electronic structures of the resultant electrocatalysts, leading to feed ratio‐dependent volcano‐type OER activity. The optimized Fe 0.89 Ni 0.11 ‐BDC/NF exhibits the best OER performance, affording a low overpotential of 220 mV to drive a current density of 50 mA · cm –2 with small Tafel slope of 44.8 mV · dec –1 and long‐lasting stability over 20 hours. The synergistic effect from the Fe III and Ni II species on both the morphological and electronic structure modulations have dramatically accelerated the reaction kinetics, responsible eventually for the enhanced OER activity. This work provides valuable information for nanostructured MOFs as efficient electrocatalysts.