电催化剂
异质结
多面体
兴奋剂
材料科学
氧气
碳纤维
电场
化学工程
化学
电极
光电子学
物理
物理化学
复合数
复合材料
数学
电化学
工程类
组合数学
有机化学
量子力学
作者
Ping Bai,Peng Wang,Jiarong Mu,Yihua Zhao,Chunfang Du,Yiguo Su
摘要
Achieving a subtle equilibrium between the activity and durability of transition metal chalcogenides (TMCs) towards oxygen reduction (ORR) and oxygen evolution (OER) reactions remains a formidable challenge.Therefore, we present a built-in electric field (BEF) tactic to build Co/Co9S8 heterojunctions with larger work function difference (ΔΦ) as bifunctional eletrocatalysts for high-efficiency zinc-air batteries (ZABs). Impressively, Co/Co9S8@NSC shows a higher half-wave potential (E1/2) of 0.88 V for ORR and a lower overpotential (Ej=10) of 137 mV at 10 mA·cm-2 for OER. Moreover, ZABs based on Co/Co9S8@NSC electrocatalysts exhibit an impressive power density of 267.83 mW·cm-2 and robust cyclability over 1000 h at 10 mA·cm-2. The experiments and theoretical studies elucidate that the interface-induced electric field effect facilitates the redistribution of interfacial charge, thereby improving the covalency of the Co-S bond. Additionally, it effectively promotes charge transfer and optimizes adsorption of oxygen intermediate in both ORR and OER.
科研通智能强力驱动
Strongly Powered by AbleSci AI