过电位
塔菲尔方程
电催化剂
分解水
析氧
石墨烯
X射线光电子能谱
异质结
材料科学
化学工程
纳米技术
化学
催化作用
电极
光电子学
物理化学
电化学
光催化
生物化学
工程类
作者
Dong‐Won Kim,Jihoon Kim,Jong Hui Choi,Do Hwan Jung,Jeung Ku Kang
标识
DOI:10.1002/advs.202408869
摘要
Abstract Zn‐air battery (ZAB)‐driven water splitting holds great promise as a next‐generation energy conversion technology, but its large overpotential, low activity, and poor stability for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) remain obstacles. Here, a trifunctional graphene‐sandwiched, heterojunction‐embedded layered lattice (G‐SHELL) electrocatalyst offering a solution to these challenges are reported. Its hollow core‐layered shell morphology promotes ion transport to Co 3 S 4 for OER and graphene‐sandwiched MoS 2 for ORR/HER, while its heterojunction‐induced internal electric fields facilitate electron migration. The structural characteristics of G‐SHELL are thoroughly investigated using X‐ray absorption spectroscopy. Additionally, atomic‐resolution transmission electron microscopy (TEM) images align well with the DFT‐relaxed structures and simulated TEM images, further confirming its structure. It exhibits an approximately threefold smaller ORR charge transfer resistance than Pt/C, a lower OER overpotential and Tafel slope than RuO₂, and excellent HER overpotential and Tafel slope, while outlasting noble metals in terms of durability. Ex situ X‐ray photoelectron spectroscopy analysis under varying potentials by examining the peak shifts and ratios (Co 2+ /Co 3+ and Mo 4+ /Mo 6+ ) elucidates electrocatalytic reaction mechanisms. Furthermore, the ZAB with G‐SHELL outperforms Pt/C+RuO 2 in terms of energy density (797 Wh kg −1 ) and peak power density (275.8 mW cm −2 ), realizing the ZAB‐driven water splitting.
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