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220 results on '"Kong, Lirong"'

39. Facile Synthesis of Medium‐Entropy Metal Sulfides as High‐Efficiency Electrocatalysts toward Oxygen Evolution Reaction.

Author

Wu, Lei, Shen, Xiaoping, Ji, Zhenyuan, Yuan, Jiaren, Yang, Shaokang, Zhu, Guoxing, Chen, Lizhi, Kong, Lirong, and Zhou, Hongbo

Subjects
OXYGEN evolution reactions, ELECTROCATALYSTS, METAL sulfides, HYDROGEN as fuel, CLEAN energy
Abstract

Developing highly efficient and durable electrocatalysts toward oxygen evolution reaction (OER) is an urgent demand to produce clean hydrogen energy. In this study, a series of medium‐entropy metal sulfides (MEMS) of (NiFeCoX)3S4 (where X = Mn, Cr, Zn) are synthesized by a facile one‐pot solvothermal strategy using molecular precursors. Benefiting from the multiple‐metal synergistic effect and the low crystallinity, these MEMS show significantly enhanced electrocatalytic OER activity compared with the binary‐metal (NiFe)3S4 and ternary‐metal (NiFeCo)3S4 counterparts. Especially, (NiFeCoMn)3S4 delivers a low overpotential of 289 mV at 10 mA cm−2, a decent Tafel slope of 75.6 mV dec−1 and robust catalytic stability in alkaline medium, outperforming the costly IrO2 benchmark electrocatalyst and the majority of the reported metal sulfide‐based electrocatalysts until now. These MEMS with facile synthesis and excellent electrocatalytic performance bring a great opportunity to design desirable electrocatalysts for practical application. [ABSTRACT FROM AUTHOR]

Published
2023
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42. In Situ Construction of Zn2Mo3O8/ZnO Hierarchical Nanosheets on Graphene as Advanced Anode Materials for Lithium-Ion Batteries

Author

Chen, Yao, Ma, Lianbo, Shen, Xiaoping, Qiu, Jingxia, Lian, Jiabiao, Ji, Zhenyuan, Yuan, Aihua, and Kong, Lirong

Abstract

Transition-metal oxides as anodes for lithium-ion batteries (LIBs) have attracted enormous interest because of their high theoretical capacity, low cost, and high reserve abundance. Unfortunately, they commonly suffer from poor electronic and ionic conductivity and relatively large volume expansion during discharge/charge processes, thereby triggering inferior cyclic performance and rate capability. Herein, a molybdenum–zinc bimetal oxide-based composite structure (Zn2Mo3O8/ZnO/rGO) with rectangular Zn2Mo3O8/ZnO nanosheets uniformly dispersed on reduced graphene oxide (rGO) has been prepared by using a simple and controllable cyanometallic framework template method. The Zn2Mo3O8/ZnO rectangular nanosheets with desirable porous features are composed of nanocrystalline subunits, facilitating the exposure of abundant active sites and providing sufficient contact with the electrolyte. Benefiting from the composition and structural merits as well as the induced synergistic effects, the Zn2Mo3O8/ZnO/rGO composite as LIB anodes delivers superior electrochemical properties, including high reversible capacity (960 mA h g–1after 100 cycles at 200 mA g–1), outstanding rate performance (417 mA h g–1at 10,000 mA g–1), and admirable long-term cyclic stability (862 mA h g–1after 400 cycles at 1000 mA g–1). The mechanism of lithium storage and the formation of SEI film are systematically elucidated. This work provides an effective strategy for synthesizing promising Mo-cluster compound-based anodes for high-performance LIBs.

Published
2023
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