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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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Ruiqi Cheng et al.
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Eun Yeop Choi et al.
Summary: A new, simple, and inexpensive method for fabricating electrocatalysts is developed to optimize the efficiency of ORR and OER in rechargeable Zn-air batteries. Holey N-doped carbon nanotubes (H-NCNT) are prepared and then encapsulated with Co nanoparticles (Co@H-NCNT). The electrocatalytic activities of Co@H-NCNT towards ORR and OER are comparable to those of Pt/C and IrO2 due to its core-shell microstructure. DFT calculation shows that Co@H-NCNT has low overpotentials for ORR and OER, resulting in excellent catalytic activities. A Zn-air battery using Co@H-NCNT exhibits excellent power density (207.0 mW/cm2) and stability after 300 cycles, making it a promising catalyst for efficient electrocatalysis in Zn-air batteries with superior energy capacity and cycle durability.
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Chao Cheng et al.
Summary: Heteroatom-doped carbon-based materials, such as N-doped graphene and carbon nanotubes, have been developed as efficient electrocatalysts for oxygen reduction reaction (ORR) in sustainable energy conversion technologies. A novel hybrid hetero-structure of N-doped graphene and carbon nanotubes (N-G/CNTs-900) was manufactured with a rational and facile method. N-G/CNTs-900 exhibited superior ORR activity compared to most carbon-based electrocatalysts, and was comparable to Pt/C. It possessed a hierarchically porous architecture, high specific surface area, abundant defects, and high active N content, enabling it to provide active sites for oxygen activation and subsequent reduction processes.
APPLIED SURFACE SCIENCE
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Guangda Zhou et al.
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Summary: Researchers have successfully synthesized and characterized Fe/N/F-tridoped CNTs catalysts, which show excellent performance in Zn-air batteries, with high open-circuit voltage, peak power density, and long-term stability, outperforming the benchmark Pt/C catalyst.
CHINESE CHEMICAL LETTERS
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Tianfang Yang et al.
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Summary: In this study, a composite of Ti3C2Tx and ZIF-67 (MXene/ZIF-67) is developed as an efficient electrocatalyst for the oxygen evolution reaction (OER). The composite exhibits improved electrochemical stability and a lower overpotential compared to MXene and RuO2. In addition, the study reveals the mechanism and role of each component in enhancing the OER performance.
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Summary: Highly efficient bifunctional catalysts for ORR and OER are essential for rechargeable Zn-air batteries. In this study, Fe3O4 and CoO nanoparticles were integrated into carbon nanoflowers to create an electrocatalyst that reduced the potential gap between ORR and OER to 0.79 V. The Zn-air battery assembled with this catalyst exhibited superior performance compared to Pt/C, including a higher open-circuit voltage, longer discharge time, higher specific capacity, and larger power density.
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Feng-Di Tu et al.
Summary: A two-dimensional Fe-N-C catalyst decorated with cerium oxides (CeOx) is developed by a host-guest strategy, which provides a large number of oxygen vacancies for accelerated oxygen reduction kinetics. The synthesized catalyst shows superior performance and stability, outperforming most reported ORR catalysts and precious metals. It demonstrates high peak power density and specific capacity in a zinc-air battery.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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Qingshan Zhao et al.
Summary: In this study, a metal-free adjacent N, P and S-codoped hierarchical porous carbon nanoshells (NPS-HPCNs) were fabricated, which demonstrated excellent ORR activity and durability in alkaline medium. The adjacent heteroatoms were engineered to generate synergistic and reinforced active sites, providing advanced metal-free electrocatalysts for Zn-air batteries and other energy conversion and storage devices.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
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Muhammad Mudassar Aslam et al.
Summary: Electrocatalysis is crucial for achieving a sustainable energy economy by facilitating redox reactions for the generation of clean fuels and chemicals from various resources. The widespread implementation of electrocatalysts is hindered by the lack of readily available catalysts that are economically viable, long-lasting, and efficient. MXenes, a family of emerging 2D materials, exhibit exceptional properties as electrocatalysts in metal-air batteries due to their hydrophilicity, high electrical conductivities, and tunable surface properties.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
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Tingting Yu et al.
Summary: This study constructs electrocatalysts with high activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a multi-component high-entropy oxide (HEO) by adjusting the composition and proportion of metal elements. A highly bifunctional HEO/Co-N-C nanocomposite electrocatalyst is synthesized by integrating the highly ORR active Co-N-C with the multi-component HEO. When used in a Zn-air battery, this electrocatalyst achieves small charge/discharge voltage differences and ultralong lifespan.
APPLIED SURFACE SCIENCE
(2023)
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Elena V. Timofeeva et al.
Summary: Metal-air batteries have the potential for high specific energy and recyclable components, which are crucial in the goal of eliminating fossil fuels. The key components, cathode electrocatalysts and compatible electrolytes, enable oxygen evolution and reduction reactions, determining the battery's performance. This review summarizes the current research on bifunctional oxygen electrocatalysts for aqueous electrolytes and discusses the necessary advancements to achieve the promise of metal-air batteries.
CURRENT OPINION IN ELECTROCHEMISTRY
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Wen-Jun Niu et al.
Summary: In this proof-of-concept study, Fe nanoparticles encapsulated by nitrogen-doped carbon were evaluated and compared to Fe single atoms for boosting the catalytic activity of the oxygen reduction reaction (ORR) in Znair batteries. The Fe single atoms and Fe nanoparticles embedded in nitrogen-doped carbon exhibited excellent ORR performance with good stability and remarkable methanol tolerance. The strong interaction between the atomically dispersed Fe-Nx and adjacent Fe nanoparticles alters the electronic structure and enhances the electrocatalytic kinetics.
CHEMICAL ENGINEERING JOURNAL
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MATERIALS TODAY CHEMISTRY
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Yantong Zhang et al.
Summary: A trimetallic electrocatalyst with efficient bifunctional catalytic activities for oxygen reduction and oxygen evolution reactions was synthesized by one-step high-temperature pyrolysis. The catalyst showed higher performance than commercial platinum carbon and IrO2 catalysts, with an E1/2 of 0.912 V vs. RHE for ORR and an overpotential of 250 mV at 10 mA/cm2 for OER. The carbon encapsulation ensured the high stability of the FeZrRu/C catalysts, resulting in Zn-air batteries with a power density of 221.34 mW/cm2.
ELECTROCHIMICA ACTA
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Soyoon Jeong et al.
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Physics, Applied
Muhammad Khurram Tufail et al.
Summary: Computation can be used to discover new solid electrolytes for next-generation all-solid-state metal batteries with increased ionic conductivity and excellent safety. Despite the promise of predicted solid electrolytes, conventional synthetic methods often face challenges due to optimization procedures and high costs. This review covers ion migration mechanisms and computational approaches to explore ion conduction in inorganic materials, providing insight for the design and optimization of high-performance solid electrolytes.
ENERGY MATERIAL ADVANCES
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Mengxia Shen et al.
Summary: Single-atom catalysts (SACs) have high intrinsic activities for oxygen reduction reaction (ORR), but controlling the dispersion of metal atoms and utilizing them effectively remain challenging. This study presents a new approach to obtain carbon nanofibers aerogel catalysts with excellent activity and durability.
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Zisheng Liu et al.
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APPLIED PHYSICS LETTERS
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Manuel Salado et al.
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Jia Sun et al.
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