@article{Ding2026, 
author = {Yutong Ding and Ruicong Geng and Wenzhao Duan and Zheng-Jun Wang and Jing-Jing Lv and Ge Meng and Wenxian Liu and Tairong Kuang},
title = {Capture-to-catalyst hollow N-doped porous carbons for closed-loop gold recovery and nitrate-to-ammonia electrocatalysis},
year = {2026},
journal = {Nano Research Energy},
keywords = {hollow N-doped porous carbon, gold recovery, reactive adsorption, capture-to-catalyst strategy, nitrate-to-ammonia electrocatalysis},
url = {https://www.sciopen.com/article/10.26599/NRE.2026.9120261},
doi = {10.26599/NRE.2026.9120261},
abstract = {Materials that recover dilute metals and convert the recovered species into functional catalysts can link resource circularity with environmental remediation, yet their design is constrained by a trade-off between rapid transport and reactive binding. Here, we report a ZIF−8-derived hollow N-doped porous carbon (HNPC) as a capture-to-catalyst platform for closed-loop gold recovery and nitrate-to-ammonia electrocatalysis. The hollow mesoporous framework shortens diffusion pathways and improves access to internal surfaces, whereas graphitic-N-associated sites promote AuCl4− adsorption and Au(III)-to-Au(0) reduction. The optimized HNPC exhibits a Langmuir Au(III) capacity of 3245.1 mg·g-1 and removes >99.9% of Au at trace concentrations under strong ionic competition, corresponding to a distribution coefficient of ~3×109 mL·g−1. Time‑resolved microscopy and spectroscopy reveal rapid Au nanoparticle nucleation and progressive conversion to Au(0), while finite−element simulations and density functional theory (DFT) identify the cooperative roles of hollow-structure-enabled transport and graphitic-N-regulated interfacial reactivity. The resulting Au/HNPC is directly reused as a gas-diffusion-electrode catalyst, delivering 96.6% Faradaic efficiency for nitrate-to-ammonia conversion and stable operation for 535 h at 200 mA·cm−2. This work establishes a materials strategy for integrating selective recovery, in situ metal formation, and catalytic reuse in complex aqueous media.}
}