Bidirectional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts are key for molecular oxygen-centric renewable energy transduction via metal-air batteries. Here, a molecular cobalt complex is covalently tethered on a strategically functionalized silica surface that displayed both ORR and OER in alkaline media. The detailed X-ray absorbance spectroscopy (XAS) studies indicate that this catalyst retains its intrinsic molecular features while playing a central role during bidirectional electrocatalysis and demonstrating a relatively lower energy gap between O/HO interconversions. This robust molecular catalyst-silica composite (deposited on a porous carbon paper) is assembled along with a zinc foil and polymeric gel membrane to devise an active single-stack quasi-solid zinc-air battery (ZAB) setup. This quasi-solid ZAB assembly displayed impressive power density (60 mW cm@100 mA cm), specific capacity (818 mAh g@ 5mA cm), energy density (757 Whkg @5mA cm), and elongated charging/discharging life (28 h). An appropriate assembly of these ZAB units is able to power practical electronic appliances, requiring ≈1.6-6.0V potential requirements.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/smll.202411021 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Tetramethylguanidine-Modified Graphene Oxide as a Gel Polymer Electrolyte Additive for Improving the Performance of Flexible Zinc-Air Batteries.
Small
January 2025
School of Mechanical Engineering, Guangxi University, Nanning, 530004, P. R. China.
Flexible zinc-air batteries (FZABs) present a promising solution for the next generation of power sources in wearable electronics, owing to their high energy density, cost-effectiveness, and safety. However, solid-state electrolytes for FZABs continue to face challenges related to rapid water loss and low ionic conductivity. In this study, a hydrophilic and stable tetramethylguanidine-modified graphene oxide as an additive, which is incorporated into sodium polyacrylate to develop a high-performance gel polymer electrolyte (GPE), is designed.
View Article and Find Full Text PDFHydrogel Electrolyte-Mediated In Situ Zn-Anode Modification and the Ru-RuO/NGr-Coated Cathode for High-Performance Solid-State Rechargeable Zn-Air Batteries.
ACS Appl Mater Interfaces
January 2025
Physical & Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, Maharashtra 411008, India.
This work aims to deal with the challenges associated with designing complementary bifunctional electrocatalysts and a separator/membrane that enables rechargeable zinc-air batteries (RZABs) with nearly solid-state operability. This solid-state RZAB was accomplished by integrating a bifunctional electrocatalyst based on Ru-RuO interface nanoparticles supported on nitrogen-doped (N-doped) graphene (Ru-RuO/NGr) and a dual-doped poly(acrylic acid) hydrogel (d-PAA) electrolyte soaked in KOH with sodium stannate additive. The catalyst shows enhanced activity and stability toward the two oxygen reactions, i.
View Article and Find Full Text PDFCyano-Bridged Bimetallic Polymer Network-Derived PdFe Intermetallic for Aqueous Rechargeable Zinc-Air Batteries.
ACS Appl Mater Interfaces
January 2025
Functional Materials and Electrochemistry Lab, Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India.
The rational design and synthesis of bifunctionally active and durable oxygen electrocatalysts have garnered significant attention for electrochemical energy conversion and storage. Intermetallic nanostructures are particularly promising for these applications due to their unique catalytic properties and exceptional durability. In this study, we present a fascinating synthetic approach for the direct synthesis of a bifunctional oxygen electrocatalyst based on nitrogen-doped carbon-encapsulated ordered PdFe (o-PdFe@NC) intermetallic, using a cyano-bridged bimetallic single-source precursor tailored for aqueous rechargeable zinc-air batteries (ZABs).
View Article and Find Full Text PDFFe─N and FeCo Nanoalloy Dual-Site Modulation by Skeleton Defect in N-Doped Graphene Aerogel for Enhanced Bifunctional Oxygen Electrocatalyst in Zinc-air Battery.
Small
January 2025
Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of the P. R. China, Shandong University, Jinan, 250100, P. R. China.
The dual-site electrocatalysts formed by metal single atoms combines with metal nanoparticles represent a promising strategy to enhance both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance. Herein, defect engineering is applied to dual-site ORR and OER electrocatalysts. Its design, synthesis, structural properties, and catalytic performance experimentally and theoretically are insightfully studied for the single-atomic Fe─N and the adjacent FeCo nanoalloy (FeCo) as dual-site loading on nitrogen-doped graphene aerogel (Fe─N/FeCo@NGA).
View Article and Find Full Text PDFThe Role of Alkali Metal Ions in Cooperative Electrocatalysis by Bifunctional Co-Mn-Mixed Phosphates.
Chem Asian J
December 2024
IIT Bombay: Indian Institute of Technology Bombay, Chemistry, INDIA.
Developing cost-effective, non-precious metal bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for advancing sustainable energy storage and conversion technologies, including zinc-air batteries, fuel cells, and water electrolyzers. This study presents a one-pot synthesis of cobalt-manganese mixed phosphates as effective bifunctional electrocatalysts for both ORR and OER. Among the catalysts tested, Na-Co-Mn-P [NaCo1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!