Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur-Treated Fe-Based Metal-Organic-Frameworks
Highly Efficient Oxygen Evolution by a Thermocatalytic Process Cascaded Electrocatalysis Over Sulfur-Treated Fe-Based Metal-Organic-Frameworks
复制标题
通过硫处理级联电催化热催化过程高效析氧——处理过的铁基金属——有机框架
DOI：
10.1002/aenm.202000184
复制
发表时间：
2020-04-01
影响因子：
27.8
通讯作者：
Zhong, Jun
中科院分区：
文献类型：
--
作者：
Feng, Kun;Zhang, Duo;Zhong, Jun
析氧反应（OER）是水裂解的瓶颈过程，寻找高效、耐用、低成本和地球资源丰富的电催化剂仍然是一个重大挑战。本文报道了硫处理的铁基金属有机骨架作为一种有前途的OER电催化剂，其在10 mA cm（-2）的电流密度下显示出218 mV的低过电位，并且在室温下显示出36.2 mV dec（-1）的非常低的Tafel斜率。在500和1000 mA·cm ~（-2）的高电流密度和298和330 mV的低过电位下，100 h后活性仍保持97%。值得注意的是，它在296 mV时可以达到1000 mA cm（-2），并且在50摄氏度时具有良好的稳定性，完全适合大规模工业水电解的要求。高催化性能可归因于-SO 3基团从 *OH或 *OOH物种中捕获H+的热催化过程，其级联到电催化途径，然后显着降低OER过电位。
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.