Journal ArticleDOI
Nitrogen-Doped Co3O4 Mesoporous Nanowire Arrays as an Additive-Free Air-Cathode for Flexible Solid-State Zinc–Air Batteries
Minghao Yu,Zhengke Wang,Cheng Hou,Zilong Wang,Chaolun Liang,Cunyuan Zhao,Yexiang Tong,Xihong Lu,Shihe Yang +8 more
TLDR
A controllable N-doping strategy to significantly improve the catalytic activity of Co3 O4 for ORR is reported and these N doped Co 3 O4 nanowires are demonstrated as an additive-free air-cathode for flexible solid-state zinc-air batteries.Abstract:
The kinetically sluggish rate of oxygen reduction reaction (ORR) on the cathode side is one of the main bottlenecks of zinc-air batteries (ZABs), and thus the search for an efficient and cost-effective catalyst for ORR is highly pursued. Co3O4 has received ever-growing interest as a promising ORR catalyst due to the unique advantages of low-cost, earth abundance and decent catalytic activity. However, owing to the poor conductivity as a result of its semiconducting nature, the ORR activity of the Co3O4 catalyst is still far below the expectation. Herein, we report a controllable N-doping strategy to significantly improve the catalytic activity of Co3O4 for ORR and demonstrate these N doped Co3O4 nanowires as an additive-free air-cathode for flexible solid-state zinc-air batteries. The results of experiments and DFT calculations reveal that the catalytic activity is promoted by the N dopant through a combined set of factors, including enhanced electronic conductivity, increased O2 adsorption strength and improved reaction kinetics. Finally, the assembly of all-solid-state ZABs based on the optimized cathode exhibit a high volumetric capacity of 98.1 mAh cm-3 and outstanding flexibility. The demonstration of such flexible ZABs provides valuable insights that point the way to the redesign of emerging portable electronics.read more
Citations
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Journal ArticleDOI
Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond
TL;DR: The physicochemical characteristics of spinels such as their compositions, structures, morphologies, defects, and substrates have been rationally regulated through various approaches and can yield spinels with improved ORR/OER catalytic activities, which can further accelerate the speed, prolong the life, and narrow the polarization of fuel cells, metal-air batteries, and water splitting devices.
Journal ArticleDOI
Defect Engineering toward Atomic Co–Nx–C in Hierarchical Graphene for Rechargeable Flexible Solid Zn-Air Batteries
TL;DR: This work demonstrates the direct utilization of the intrinsic structural defects in nanocarbon to generate atomically dispersed Co-Nx -C active sites via defect engineering and provides a new concept and effective methodology for the full utilization ofnanocarbon materials with various structural features and further development of advanced energy materials.
Journal ArticleDOI
A Review of Precious-Metal-Free Bifunctional Oxygen Electrocatalysts: Rational Design and Applications in Zn−Air Batteries
Journal ArticleDOI
Phosphorus-Doped Co3O4 Nanowire Array: A Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting
Zhichao Wang,Zhichao Wang,Hongli Liu,Ruixiang Ge,Xiang Ren,Jun Ren,Dongjiang Yang,Lixue Zhang,Xuping Sun,Xuping Sun +9 more
TL;DR: In this article, a P-doped Co3O4 nanowire array on nickel foam was developed for water splitting using low-temperature annealing, using NaH2PO2 as the P source.
Journal ArticleDOI
Flexible Zn– and Li–air batteries: recent advances, challenges, and future perspectives
Peng Tan,Bin Chen,Haoran Xu,Houcheng Zhang,Houcheng Zhang,Weizi Cai,Meng Ni,Meilin Liu,Zongping Shao,Zongping Shao +9 more
TL;DR: A detailed review of the advancements made in the design of flexible battery components: the metal electrode, the electrolyte membrane, and the air electrode can be found in this paper, where the effects of operating conditions on battery performance characteristics and durabilities are discussed, including the effect of the operating temperature and the contaminants commonly encountered in ambient air.
References
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Journal ArticleDOI
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Nitrogen-Concentration Dependence on Photocatalytic Activity of TiO2-xNx Powders
TL;DR: In this paper, the same absorbed photon number, 1.4 × 1014 quanta·cm-2·s-1, of visible (Vis) or ultraviolet (UV) light was evaluated by the decomposition of gaseous 2-propanol (IPA) powders with low nitrogen concentrations (< 0.02) and showed that the isolated narrow band formed above the valence band is responsible for the Vis light response in the present nitrogen doped TiO2.
Journal ArticleDOI
Graphitic carbon nitride materials: controllable synthesis and applications in fuel cells and photocatalysis
TL;DR: In this article, the potential applications of nanostructured and nanoporous graphitic carbon nitrides (g-C3N4) materials have been developed for a wide range of new applications.
Journal ArticleDOI
Synthesis and Characterization of Cobalt Hydroxide, Cobalt Oxyhydroxide, and Cobalt Oxide Nanodiscs
TL;DR: In this article, the authors synthesize cobalt hydroxide, cobalt oxyhydroxide and cobalt oxide nanomaterials through simple soft chemistry, and characterisation of these cobalt-based materials is fully developed, including X-ray diffraction, transmission electron microscopy combined with selected area electron diffraction.
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Mesoporous Co3O4 nanowire arrays for lithium ion batteries with high capacity and rate capability.
Yanguang Li,Bing Tan,Yiying Wu +2 more
TL;DR: The high capacity and rate capability of mesoporous Co3O4 nanowire (NW) arrays as anodes in Li ion batteries are reported, with their ease of large area synthesis and superior electrochemical properties.