Miaoxi Shuai, Jixue Lu, Yapeng Hao, Changhong Wang, Quanxiao Peng, Yi Qian, Yangbin Shen, Yiming Zhu, Feng Liu, Shaqi Fu, Changming Zhao, Changming Li, Liangliang Zou, Chunxian Guo
Valence-state engineering of CuOx nanowires (CuOx NWs) is achieved through a novel phosphorus (P) anion doping strategy. P-doping drives surface reconstruction toward a Cu(I)-enriched state, which effectively moderates hydrogen adsorption and suppresses the competing hydrogen evolution reaction. Consequently, it achieves 96.2% NH3 Faradaic efficiency at -0.59 V vs. RHE in a neutral electrolyte, outperforming CuOx NWs and S-doped CuOx NWs. This work highlights the potential of anion-mediated valence engineering for selective electrocatalytic nitrate-to-ammonia conversion.