Breaking the scaling relations of oxygen evolution reaction on amorphous NiFeP nanostructures with enhanced activity for overall seawater splitting

Liu, Jianyun ¹Liu, Xuan ¹Shi, Hao ¹Luo, Jiahuan ²Wang, Liang ¹Liang, Jiashun ¹Li, Shenzhou ¹Yang, Li-Ming ¹Wang, Tanyuan ¹Huang, Yunhui ¹Li, Qing¹

扫码查看

作者信息

1. Huazhong Univ Sci & Technol
2. Anyang Inst Technol
折叠

Abstract

The instinct scaling relations between the adsorption energies of key intermediates during OER lead to large overpotential for water/seawater splitting. Herein, we develop a new strategy to fabricate amorphous nickel-iron phosphides (NiFeP) with controllable morphologies as high-performance catalysts for overall seawater splitting. The ligand effect of P tunes the electronic states of the oxidized NiFe sites, thus breaks the scaling relations for OER and reduce the adsorption energy gap between HO* and HOO* from 3.08 eV to 2.62 eV. The NiFeP nanostructures exhibit extraordinarily low overpotentials of 129 mV for OER and 126 mV for HER at 100 mA cm-2 in simulated alkaline seawater, which outperform the best reported electrocatalysts. They could also be operated at 1.57 V with 100 mA cm-2 in a two-electrode electrolyzer and work for more than 500 h. Our work may provide a universal guidance for the design of highly active seawater splitting electrocatalysts.

Key words

Seawater splitting/Amorphous phosphide/Oxygen evolution reaction/Hydrogen evolution reaction/Electrocatalysis/TOTAL-ENERGY CALCULATIONS/METAL PHOSPHIDES/EFFICIENT/ELECTROCATALYST/CATALYST/HYDROGEN/REDUCTION/NICKEL/PHOSPHATE/EXCHANGE

引用本文复制引用

出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量80

参考文献量68

段落导航