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Advances of entropy-stabilized homologous compounds for electrochemical energy storage

Journal of Energy Chemistry 2022年第4期31卷 276-289页

作者： Xin Wang Xiang Li Huarong Fan Ming Miao Yiming Zhang Wei Guo Yongzhu Fu College of Chemistry Zhengzhou University Zhengzhou 450001Henan China

Recently, high-entropy materials(HEMs) have gained increasing interest in the field of energy storage technology on account of their unique structural characteristics and possibilities for tailoring functional properties. Herein, the development of this class of materials for electrochemical energy storage have been reviewed, especially the fundamental understanding of entropy-dominated phase-stabilization effects and prospective applications are presented. Subsequently, critical comments of HEMs on the different aspects of battery and supercapacitor are summarized with the underlying principles for the observed properties. In addition, we also summarize their potential advantages and remaining challenges, which will ideally provide some general guidelines and principles for researchers to study and develop advanced HEMs. The diversity of material design contributed by the entropy-mediated concept provides the researchers numerous ideas of new candidates for practical applications and ensures further research in the emerging field of energy storage.

关键词： high entropy material Battery Supercapacitor entropy-stabilized conversion mechanism

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high entropy spinel oxide for efficient electrochemical oxidation of ammonia

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Nano Research 2022年第6期15卷 4785-4791页

作者： Shi He Vasishta Somayaji Mengdi Wang Seung-Hoon Lee Zhijia Geng Siyuan Zhu Peter Novello Chakrapani V.Varanasi Jie Liu Department of Chemistry Duke UniversityDurhamNC 27708USA U.S.Army Research Office P.O.Box 12211 Research Triangle ParkNC 27709USA

Ammonia has emerged as a promising energy carrier owing to its carbon neutral content and low expense in long-range ***,development of a specific pathway to release the energy stored in ammonia is therefore in urgent *** oxidation provides a convenient and reliable route to attain efficient utilization of ***,we report that the high entropy(Mn,Fe,Co,Ni,Cu)_(3)O_(4)oxides can achieve high electrocatalytic activity for ammonia oxidation reaction(AOR)in non-aqueous *** AOR onset overpotential of(Mn,Fe,Co,Ni,Cu)_(3)O_(4)is 0.70 V,which is nearly 0.2 V lower than that of their most active single metal cation *** mass spectroscopy study reveals that(Mn,Fe,Co,Ni,Cu)_(3)O_(4)preferentially oxidizes ammonia to environmentally friendly diatomic nitrogen with a Faradic efficiency of over 85%.The Xray photoelectron spectroscopy(XPS)result indicates that the balancing metal d-band of Mn and Cu cations helps retain a longlasting electrocatalytic ***,this work introduces a new family of earth-abundant transition metal high entropy oxide electrocatalysts for AOR,thus heralding a new paradigm of catalyst design for enabling ammonia as an energy carrier.

关键词： ammonia electrochemical oxidation high entropy material electrochemical interface renewable energy

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