▌High-performance, bias-free solar valorization of nitrate and iodide to ammonia and triiodide in acidic media
高性能無偏壓太陽能轉化：於酸性介質中將硝酸根與碘離子轉為氨與三碘離子
Tsung-Hsin Liu, Nutthun Thanajantaporn, Yung-Hung Huang, Jou-Chun Lin, Lo-Yu Lee, Cheng-Yu Yu, Ya-Wen Tang, Ya-Lun Ho, Jessie Shiue, Di-Yan Wang* and Chun-Wei Chen*
https://doi.org/10.1016/j.apcatb.2026.127131
SEED Member: Di-Yan Wang
Major Contributions
1. Built a fully bias-free photoelectrochemical platform that couples nitrate reduction (NtRR) with iodide oxidation (IOR) using graphene-passivated silicon heterojunction (Gr/SiHJT) photoelectrodes that are stable in strongly acidic media.
2. The Cu/Gr/SiHJT photocathode reaches a Faradaic efficiency of 98.6% and an NH₃ yield rate of 148.5 µmol h⁻¹ cm⁻² at 0.26 V vs RHE, while the Gr/SiHJT photoanode catalyzes IOR with near-unity selectivity.
3. In an artificial-leaf configuration under one sun, the paired photoelectrodes produce NH₃ and I₃⁻ at 65.0 and 285.1 µmol h⁻¹ cm⁻² without external bias and operate stably for over 120 h.
主要貢獻
1. 建立完全無偏壓的光電化學平台：以石墨烯鈍化矽異質接面（Gr/SiHJT）光電極耦合硝酸根還原與碘離子氧化（NtRR//IOR），可在強酸環境中穩定運作。
2. Cu/Gr/SiHJT 光陰極於 0.26 V vs RHE 下法拉第效率 98.6%、NH₃ 產率 148.5 µmol h⁻¹ cm⁻²；Gr/SiHJT 光陽極催化 IOR 的選擇性接近 100%。
3. 組成人工葉片並在一個太陽光照下，不需外加偏壓即可同時產生 NH₃ 與 I₃⁻（產率分別為 65.0 與 285.1 µmol h⁻¹ cm⁻²），並穩定運轉超過 120 小時。
