Jeon Jaeeun, Park Kyoung Ryeol, Kim Kang Min, Ko Daehyeon, Han HyukSu, Oh Nuri, Yeo Sunghwan, Ahn Chisung, Mhin Sungwook
Korea Institute of Industrial Technology, 113-58, Siheung 15014, Korea.
Korea Institute of Industrial Technology, 55, Ulsan 44413, Korea.
Nanomaterials (Basel). 2022 Mar 16;12(6):983. doi: 10.3390/nano12060983.
Exploring bifunctional electrocatalysts to lower the activation energy barriers for sluggish electrochemical reactions for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are of great importance in achieving lower energy consumption and higher conversion efficiency for future energy conversion and storage system. Despite the excellent performance of precious metal-based electrocatalysts for OER and ORR, their high cost and scarcity hamper their large-scale industrial application. As alternatives to precious metal-based electrocatalysts, the development of earth-abundant and efficient catalysts with excellent electrocatalytic performance in both the OER and the ORR is urgently required. Herein, we report a core-shell CoFeS@CoS heterostructure entangled with carbon nanotubes as an efficient bifunctional electrocatalyst for both the OER and the ORR. The CoFeS@CoS nanocubes entangled with carbon nanotubes show superior electrochemical performance for both the OER and the ORR: a potential of 1.5 V (vs. RHE) at a current density of 10 mA cm for the OER in alkaline medium and an onset potential of 0.976 V for the ORR. This work suggests a processing methodology for the development of the core-shell heterostructures with enhanced bifunctional performance for both the OER and the ORR.
探索双功能电催化剂以降低析氧反应（OER）和氧还原反应（ORR）等缓慢电化学反应的活化能垒，对于实现未来能量转换和存储系统的更低能耗及更高转换效率至关重要。尽管基于贵金属的电催化剂在OER和ORR方面表现出色，但其高成本和稀缺性阻碍了它们的大规模工业应用。作为基于贵金属的电催化剂的替代方案，迫切需要开发在OER和ORR中均具有优异电催化性能的储量丰富且高效的催化剂。在此，我们报道了一种与碳纳米管缠结的核壳结构CoFeS@CoS异质结构，作为一种用于OER和ORR的高效双功能电催化剂。与碳纳米管缠结的CoFeS@CoS纳米立方体在OER和ORR中均表现出优异的电化学性能：在碱性介质中，OER在电流密度为10 mA cm时的电位为1.5 V（相对于可逆氢电极），ORR的起始电位为0.976 V。这项工作提出了一种制备方法，用于开发在OER和ORR中均具有增强双功能性能的核壳异质结构。
