TY  - JOUR
AU  - Yang, Chaoxin
AU  - Cai, Zhengwei
AU  - Liang, Jie
AU  - Dong, Kai
AU  - Li, Zixiao
AU  - Sun, Hang
AU  - Sun, Shengjun
AU  - Zheng, Dongdong
AU  - Zhang, Hui
AU  - Luo, Yongsong
AU  - Yao, Yongchao
AU  - Wang, Yan
AU  - Ren, Yuchun
AU  - Liu, Qian
AU  - Li, Luming
AU  - Chu, Wei
AU  - Sun, Xuping
AU  - Tang, Bo
PY  - 2024
TI  - Surface-derived phosphate layer on NiFe-layered double hydroxide realizes stable seawater oxidation at the current density of 1 A·cm−2
JO  - Nano Research
SN  - 1998-0124
SP  - 5786
EP  - 5794
VL  - 17
IS  - 7
AB  - Seawater electrolysis, especially in coastlines, is widely considered as a sustainable way of making clean and high-purity H2 from renewable energy; however, the practical viability is challenged severely by the limited anode durability resulting from side reactions of chlorine species. Herein, we report an effective Cl− blocking barrier of NiFe-layer double hydroxide (NiFe-LDH) to harmful chlorine chemistry during alkaline seawater oxidation (ASO), a pre-formed surface-derived NiFe-phosphate (Pi) outer-layer. Specifically, the PO43−-enriched outer-layer is capable of physically and electrostatically inhibiting Cl− adsorption, which protects active Ni3+ sites during ASO. The NiFe-LDH with the NiFe-Pi outer-layer (NiFe-LDH@NiFe-Pi) exhibits higher current densities (j) and lower overpotentials to afford 1 A·cm−2 (η1000 of 370 mV versus η1000 of 420 mV) than the NiFe-LDH in 1 M KOH + seawater. Notably, the NiFe-LDH@NiFe-Pi also demonstrates longer-term electrochemical durability than NiFe-LDH, attaining 100-h duration at the j of 1 A·cm−2. Additionally, the importance of surface-derived PO43−-enriched outer-layer in protecting the active centers, γ-NiOOH, is explained by ex situ characterizations and in situ electrochemical spectroscopic studies.
UR  - https://doi.org/10.1007/s12274-024-6562-z
DO  - 10.1007/s12274-024-6562-z