journal article·2021-07

Generating Short‐Chain Sulfur Suitable for Efficient Sodium–Sulfur Batteries via Atomic Copper Sites on a N,O‐Codoped Carbon Composite

Fengping Xiao, Hongkang Wang, Jun Xu, Wenqi Yang, Xuming Yang, Denis Y. W. Yu, Andrey L. Rogach

Advanced Energy Materials· Volume 11· Issue 26
Publisher page

Abstract

Abstract Sodium–sulfur batteries have attracted attention due to their high energy capacities and low costs, but the dissolution of sodium polysulfides still severely affects their cycle life, limiting their real‐world applications. Herein, a stable sulfur host is reported, based on a N,O‐codoped carbon composite derived from a bimetallic Cu–Zn metal‐organic framework, which ensures high sulfur loading (67 wt%). Most importantly, this composite also includes single‐atom copper catalysts, with a high Cu loading of 8.03 wt%. Solid‐state nuclear magnetic resonance, synchrotron X‐ray absorption spectroscopy, and single‐crystal X‐ray diffraction analysis show that single atoms of Cu are coordinated with two N and two O atoms within the produced composite material. Those copper sites can weaken SS bonds in the S8 ring structure, and thus are able to catalyze the formation of short‐chain sulfur molecules in even larger‐size pores. In addition, Cu atoms facilitate the conversion between the short‐chain sulfur and Na2S. As a result, when the produced sulfur‐loaded carbon framework containing the atomic Cu catalyst is used as a cathode for sodium–sulfur batteries, it exhibits superior capacity of 776 mAh g–1 with a high sulfur utilization (1158 mAh gs–1 normalized with sulfur content) after 100 cycles at 0.1 A g–1, and an excellent rate performance of 483 mAh g–1 (720 mAh gs–1) at 5 A g–1.
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Research context

OpenAlex topics: Advanced Battery Materials and Technologies · Layered Double Hydroxides Synthesis and Applications · Polyoxometalates: Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering and Center for Functional Photonics (CFP) City University of Hong Kong 83 Tat Chee Avenue, Kowloon Hong Kong S.A.R. 999077 P. R. China

State Key Lab of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE) School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China

Center for Rare Earth and Inorganic Functional Materials Tianjin Key Lab for Rare Earth Materials and Applications School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 P. R. China

School of Environment and Chemical Engineering Zhaoqing University Zhaoqing Guangdong 526061 P. R. China

Department of Materials Science and Engineering Southern University of Science and Technology 1088 Xueyuan Road Shenzhen Guangdong 518055 P. R. China

School of Energy and Environment and Center of Super‐Diamond and Advanced Films (COSDAF) City University of Hong Kong 83 Tat Chee Avenue, Kowloon Hong Kong S.A.R. 999077 P. R. China

Funding

City University of Hong Kong · China Postdoctoral Science Foundation · National Natural Science Foundation of China

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