双功能
沸石咪唑盐骨架
析氧
电催化剂
材料科学
化学工程
阳极
分解水
纳米技术
催化作用
化学
电极
金属有机骨架
电化学
吸附
物理化学
工程类
有机化学
光催化
生物化学
作者
Xue‐Zhi Song,Qiao-Feng Su,Shaojie Li,Gui-Chao Liu,Nan Zhang,Wenxuan Zhu,Zi-Hao Wang,Zhenquan Tan
标识
DOI:10.1016/j.ijhydene.2020.08.120
摘要
The design and fabrication of highly active, robust and cost-efficient electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of great significance towards overall water splitting, but remains challenging as well. Herein, we report, for the first time, heterostructural Co/CeO2/Co2P/[email protected] dodecahedrons as bifunctional electrocatalyst, in which abundant interfaces are formed between different components. Typical ZIF-67 (ZIF = zeolitic imidazolate framework) dodecahedrons with pre-inserted CeO2 nanowires were selected as precursors to synthesize Co/CeO2/Co2P/[email protected] via a direct carbonization process followed by phosphidation, simultaneously generating the strong coupled heterojunction interfaces through interactions between CeO2 and CoxP species. Abundant porous structure leads to the exposure of more active sites and the carbon encapsulation of nanodomains sustains the high robustness and conductivity and the synergistic effect between the multi-components heterostructure. Benefiting from the above collective advantages, the Co/CeO2/Co2P/[email protected] electrocatalysts exhibit small overpotentials of 307 and 195 mV to derive 10 mA cm−2 for OER and HER, respectively. Furthermore, an alkaline electrolyzer assembled by using Co/CeO2/Co2P/[email protected] as both cathode and anode can achieve a current density of 10 mA cm−2 at a low voltage of 1.76 V and work continuously for over 15 h. This work would provide a rational protocol for fabrication multi-phase interface enriched electrocatalysts toward highly efficient energy conversion.
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