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Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur‐Treated Fe‐Based Metal–Organic‐Frameworks
Author(s) -
Feng Kun,
Zhang Duo,
Liu Fangfang,
Li Hui,
Xu Jiabin,
Xia Yujian,
Li Youyong,
Lin Haiping,
Wang Shuao,
Shao Mingwang,
Kang Zhenhui,
Zhong Jun
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202000184
Subject(s) - tafel equation , overpotential , oxygen evolution , electrocatalyst , materials science , water splitting , electrolysis , electrolysis of water , metal organic framework , catalysis , chemical engineering , sulfur , inorganic chemistry , electrode , electrochemistry , chemistry , metallurgy , electrolyte , organic chemistry , photocatalysis , adsorption , engineering
The oxygen evolution reaction (OER) is a bottleneck process for water splitting and finding highly efficient, durable, low‐cost, and earth‐abundant electrocatalysts is still a major challenge. Here a sulfur‐treated Fe‐based metal–organic‐framework is reported as a promising electrocatalyst for the OER, which shows a low overpotential of 218 mV at the current density of 10 mA cm −2 and exhibits a very low Tafel slope of 36.2 mV dec −1 at room temperature. It can work on high current densities of 500 and 1000 mA cm −2 at low overpotentials of 298 and 330 mV, respectively, by keeping 97% of its initial activity after 100 h. Notably, it can achieve 1000 mA cm −2 at 296 mV with a good stability at 50 °C, fully fitting the requirements for large‐scale industrial water electrolysis. The high catalytic performance can be attributed to the thermocatalytic processes of H + capture by –SO 3 groups from *OH or *OOH species, which cascades to the electrocatalytic pathway and then significantly reduces the OER overpotentials.