摘要
Decoupled electrolysis of water is a promising strategy for peak load regulation of electricity.The key to developing this technology is to construct decoupled devices containing stable redox mediators and corresponding efficient catalysts,which remains a considerable challenge.Herein,we designed a high-performance device,using polysulfides as mediators and graphene-encapsulated CoNi as catalysts.It produced H2 with a low potential of 0.82 V at 100 mA/cm^(2),saving 60.2%more energy than direct water electrolysis.The capacity of H2 production reached 2.53105 mAh/cm^(2),which is the highest capacity reported so far.This device exhibited excellent cyclability in 15-day recycle tests,without any decay of performance.The calculation results revealed that the electronic structure of the graphene shell was modulated by the electron transfer from N-dopant and metal core,which significantly facilitated recycle of polysulfides on graphene surfaces.This study provides a promising method for constructing a smart grid by developing efficient decoupled devices.
基金
We gratefully acknowledge the financial support from the Ministry of Science and Technology of the People’s Republic of China(no.2016YFA0204100 and 2016YFA0200200)
the National Natural Science Foundation of China(no.21890753 and 21988101)
the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(no.QYZDB-SSW-JSC020)
the DNL Cooperation Fund,CAS(no.DNL180201)
the Natural Science Foundation of Shandong Province(ZR2019MEE015)
the Key Research and Development Plan of Shandong Province(2018GSF117042).
作者简介
Mo Zhang,These authors have contributed equally;Jing Guan,These authors have contributed equally;Correspondence: Dehui Deng,dhdeng@dicp.ac.cn。
