@article{Zhang2026, 
author = {Jingwen Zhang and Jin Zhang and Renyi Wei and Xiaoyang Cheng and Longchao Zhuo and Jia He and Xijun Liu},
title = {Controllable Phosphidation Engineering of Co2P2O7@CoP Core-Shell Electrodes for Enhanced Sulfur-Iodine Flow Batteries},
year = {2026},
journal = {Nano Research Energy},
keywords = {polysulfide/iodide redox flow batteries, heterostructured electrocatalyst, dual-function design, high-efficiency},
url = {https://www.sciopen.com/article/10.26599/NRE.2026.9120260},
doi = {10.26599/NRE.2026.9120260},
abstract = {Polysulfide/iodide redox flow batteries (SIFBs) are promising for large-scale energy storage, but their practical performance is limited by sluggish interfacial kinetics and severe shuttle of soluble intermediates. Here we report a core-shell Co2P2O7@CoP catalytic electrode that addresses these two challenges through an integrated conductivity-adsorption strategy. In this architecture, the CoP shell serves as a highly conductive pathway for rapid charge transfer, while the Co2P2O7 core provides polar P-O sites that strongly immobilize both polysulfide and polyiodide intermediates. This dual-function design enables simultaneous acceleration of the S2-/Sx2- and I-/I3- redox reactions and effective suppression of side reactions. As a result, the assembled SIFB delivers an initial energy efficiency of 84.53% at 20 mA cm-2 and maintains 64.61% after 50 cycles. Long-term operation at 10 mA cm-2 and 10% SOC remains stable for 400 cycles with energy efficiency above 70%. DFT calculations reveal that interfacial electronic coupling, rather than simple phase addition, is responsible for the enhanced adsorption and reduced reaction barriers.}
}