Discovery of earth-abundant electrocatalysts to replace iridium for the oxygen evolution reaction (OER) in a proton exchange membrane water electrolyzer (PEMWE) represents a critical step in reducing the cost for green hydrogen production. We report a nanofibrous cobalt spinel catalyst codoped with lanthanum (La) and manganese (Mn) prepared from a zeolitic imidazolate framework embedded in electrospun polymer fiber. The catalyst demonstrated a low overpotential of 353 millivolts at 10 milliamperes per square centimeter and a low degradation for OER over 360 hours in acidic electrolyte. A PEMWE containing this catalyst at the anode demonstrated a current density of 2000 milliamperes per square centimeter at 2.47 volts (Nafion 115 membrane) or 4000 milliamperes per square centimeter at 3.00 volts (Nafion 212 membrane) and low degradation in an accelerated stress test.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.ade1499 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enhancing cathode composites with conductive alignment synergy for solid-state batteries.
Sci Adv
January 2025
Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA.
Article Synopsis
- Enhancing transport and mechanical properties in cathode composites is essential for solid-state battery performance.
- The FAST electrode features vertically aligned carbon nanotubes in a polymer electrolyte, improving ionic and electronic conductivity while reinforcing the electrode.
- This innovative design leads to excellent electrochemical performance, achieving a capacity of 148.2 mAh/g at 0.2 C over 100 cycles, indicating progress in solid-state lithium metal battery technology.
A wearable triboelectric impedance tomography system for noninvasive and dynamic imaging of biological tissues.
Sci Adv
December 2024
Beijing Key Laboratory of Micro-Nano Energy and Sensor, Center for High-Entropy Energy and Systems, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 101400, P. R. China.
Tissue imaging is usually captured by hospital-based nuclear magnetic resonance. Here, we present a wearable triboelectric impedance tomography (TIT) system for noninvasive imaging of various biological tissues. The imaging mechanism relies on the obtained impedance information from the different soft human tissues.
View Article and Find Full Text PDFThe multifunctional use of an aqueous battery for a high capacity jellyfish robot.
Sci Adv
November 2024
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA.
The batteries that power untethered underwater vehicles (UUVs) serve a single purpose: to provide energy to electronics and motors; the more energy required, the bigger the robot must be to accommodate space for more energy storage. By choosing batteries composed primarily of liquid media [e.g.
View Article and Find Full Text PDFSoft-hard zwitterionic additives for aqueous halide flow batteries.
Nature
November 2024
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, USA.
Article Synopsis
- * The introduction of soft-hard zwitterionic trappers (SH-ZITs) helps manage polyhalides effectively by promoting homogeneous halide cycling and preventing membrane crossover, which enhances battery performance.
- * Testing revealed that with SH-ZITs, the battery maintained over 99.9% efficiency for more than 1,000 cycles, achieving high capacity and stability, along with the potential to work alongside a zinc anode in hybrid configurations.
Stabilized Cu -Cu dual sites in a cyanamide framework for selective CO electroreduction to ethylene.
Nat Commun
September 2024
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
Electrochemical reduction of carbon dioxide to produce high-value ethylene is often limited by poor selectivity and yield of multi-carbon products. To address this, we propose a cyanamide-coordinated isolated copper framework with both metallic copper (Cu) and charged copper (Cu) sites as an efficient electrocatalyst for the reduction of carbon dioxide to ethylene. Our operando electrochemical characterizations and theoretical calculations reveal that copper atoms in the CuNCN complex enhance carbon dioxide activation by improving surface carbon monoxide adsorption, while delocalized electrons around copper sites facilitate carbon-carbon coupling by reducing the Gibbs free energy for *CHC formation.
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!