Bimetallic Nickel Cobalt Sulfide as Efficient Electrocatalyst for Zn–Air Battery and Water Splitting
Jingyan Zhang,Xiaowan Bai,Tongtong Wang,Wen Xiao,Pinxian Xi,Jinlan Wang,Daqiang Gao,John Wang +7 more
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TLDR
Owing to the synergistic combination of Ni and Co, the (Ni,Co)S2 exhibits superior electrocatalytic performance for ORR, OER, and HER in an alkaline electrolyte, and the first principle calculation results indicate that the reaction of an adsorbed O atom with a H2O molecule to form a *OOH is the potential limiting step in the OER.Abstract:
The development of efficient earth-abundant electrocatalysts for oxygen reduction, oxygen evolution, and hydrogen evolution reactions (ORR, OER, and HER) is important for future energy conversion and energy storage devices, for which both rechargeable Zn–air batteries and water splitting have raised great expectations. Herein, we report a single-phase bimetallic nickel cobalt sulfide ((Ni,Co)S2) as an efficient electrocatalyst for both OER and ORR. Owing to the synergistic combination of Ni and Co, the (Ni,Co)S2 exhibits superior electrocatalytic performance for ORR, OER, and HER in an alkaline electrolyte, and the first principle calculation results indicate that the reaction of an adsorbed O atom with a H2O molecule to form a *OOH is the potential limiting step in the OER. Importantly, it could be utilized as an advanced air electrode material in Zn–air batteries, which shows an enhanced charge–discharge performance (charging voltage of 1.71 V and discharge voltage of 1.26 V at 2 mA cm−2), large specific capacity (842 mAh gZn−1 at 5 mA cm−2), and excellent cycling stability (480 h). Interestingly, the (Ni,Co)S2-based Zn–air battery can efficiently power an electrochemical water-splitting unit with (Ni,Co)S2 serving as both the electrodes. This reveals that the prepared (Ni,Co)S2 has promising applications in future energy conversion and energy storage devices.read more
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Identifying the Activation of Bimetallic Sites in NiCo 2 S 4 @g-C 3 N 4 -CNT Hybrid Electrocatalysts for Synergistic Oxygen Reduction and Evolution
TL;DR: The design and fabrication of an integrated flexible electrode based on NiCo2 S4 /graphitic carbon nitride/carbon nanotube (NiCo3 N4 -CNT) and the identified bimetallic coactivation mechanism will shed light on the rational design and interfacial engineering of hybrid nanomaterials for diverse applications.
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Organic-Inorganic-Induced Polymer Intercalation into Layered Composites for Aqueous Zinc-Ion Battery
Duan Bin,Wangchen Huo,Yingbo Yuan,Jianhang Huang,Yao Liu,Yuxin Zhang,Fan Dong,Yonggang Wang,Yongyao Xia +8 more
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The oxygen evolution reaction enabled by transition metal phosphide and chalcogenide pre-catalysts with dynamic changes.
TL;DR: The electrochemical stability of TMPs and TMCs predicted using Pourbaix diagrams and their morphological, structural and compositional evolution under OER conditions are discussed.
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Expediting in-Situ Electrochemical Activation of Two-DimensionalMetal–Organic Frameworks for Enhanced OER Intrinsic Activityby Iron Incorporation
TL;DR: In this paper, the impact of the rate and related pyrochemical activation on the performance of in-situ surface modification of MOF materials away from thermal decomposition is investigated.
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Engineering Lower Coordination Atoms onto NiO/Co3O4 Heterointerfaces for Boosting Oxygen Evolution Reactions
TL;DR: In this article, low-coordination atoms (LCAs) have been proven to play a critical role in boosting electrocatalysis, and for enhancing catalytic activity, suitably engineering the LCAs in catalysts through Ra...
References
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