D‐Band Modulation by Elements Synergistic Design for High‐Performance Zinc Air Batteries

Why It Matters

Optimizing the d‑band through multi‑element design unlocks record‑breaking activity and durability for zinc‑air systems, accelerating commercial adoption of metal‑air energy storage.

Key Takeaways

• Element synergy tunes d-band center for better kinetics
• Tungsten drives electronic reconstruction across HEN active sites
• HEN catalyst achieves 0.978 V ORR onset, 291.8 mV OER overpotential
• Zn‑air cell delivers 1.529 V OCV, 450 stable cycles
• Salt‑template method yields uniform 10 nm HEN nanoparticles

Pulse Analysis

High‑entropy nitrides have emerged as a frontier in electrocatalysis because their compositional complexity offers a tunable electronic structure that traditional alloys cannot match. By deliberately mixing five transition metals, researchers can manipulate the d‑band center—a key descriptor of metal‑oxygen interactions—thereby optimizing the binding energy of *OH intermediates that govern both oxygen reduction and evolution reactions. This approach moves beyond trial‑and‑error alloying, leveraging theoretical insights to target specific electronic configurations that lower kinetic barriers.

The study introduced a salt‑template assisted synthesis that produces ~10 nm HEN particles uniformly dispersed on nitrogen‑doped graphitic carbon. Density functional theory revealed that tungsten acts as an electronic lever, pulling the d‑band of neighboring metals upward and facilitating faster *OH adsorption/desorption cycles. Electrochemical testing confirmed the theoretical predictions: the catalyst reached an ORR onset of 0.978 V and required only 291.8 mV overpotential for OER at 100 mA cm⁻², metrics that rival or surpass many noble‑metal benchmarks. When deployed in a zinc‑air battery, these catalysts delivered a 1.529 V open‑circuit voltage and maintained performance across 450 cycles, demonstrating both high power density and long‑term stability.

For the broader energy market, this breakthrough signals that high‑entropy materials can bridge the gap between laboratory performance and real‑world durability in metal‑air batteries. The ability to fine‑tune electronic structures without relying on scarce precious metals reduces cost and supply‑chain risk, positioning zinc‑air technology as a viable contender for grid‑scale storage and electric‑vehicle applications. Future research will likely explore scaling the salt‑template process and extending the elemental palette to further push the limits of catalytic efficiency and lifecycle longevity.