Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur-Treated Fe-Based Metal-Organic-Frameworks

被引：95

作者：

Feng, Kun ^{[1
]}

Zhang, Duo ^{[2
]}

Liu, Fangfang ^{[1
]}

Li, Hui ^{[2
]}

Xu, Jiabin ^{[1
]}

Xia, Yujian ^{[1
]}

Li, Youyong ^{[1
]}

Lin, Haiping ^{[1
]}

Wang, Shuao ^{[2
]}

Shao, Mingwang ^{[1
]}

Kang, Zhenhui ^{[1
]}

Zhong, Jun ^{[1
]}

机构：

[1] Soochow Univ, Inst Funct Nano & Soft Mat Lab FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China

[2] Soochow Univ, Sch Radiat Med & Protect, State Key Lab Radiat Med & Protect, Suzhou 215123, Peoples R China

来源：

ADVANCED ENERGY MATERIALS | 2020年 / 10卷 / 16期

基金：

中国国家自然科学基金;

关键词：

electrochemical OER; metal-organic-framework; sulfur-treatment; thermocatalytic processes; X-RAY-ABSORPTION; TOTAL-ENERGY CALCULATIONS; OXIDATION-STATES; CARBON; NANOSTRUCTURES; IDENTIFICATION; CATALYSTS; ARRAYS; SITES;

D O I：

10.1002/aenm.202000184

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees 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 -SO3 groups from *OH or *OOH species, which cascades to the electrocatalytic pathway and then significantly reduces the OER overpotentials.

引用

页数：8

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