Premium
Modulating Hydroxyl‐Rich Interfaces on Nickel–Copper Double Hydroxide Nanotyres to Pre‐activate Alkaline Ammonia Oxidation Reactivity
Author(s) -
Yang Anzhou,
Wang Jingchun,
Su Keying,
Lei Wu,
Qiu Xiaoyu,
Tang Yawen
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202004904
Subject(s) - hydroxide , ammonia , reactivity (psychology) , nickel , catalysis , inorganic chemistry , chemistry , copper , organic chemistry , medicine , alternative medicine , pathology
The surface hydroxyl groups of Ni x Cu 1− x (OH) 2 play a crucial role in governing their conversion efficiency into Ni x Cu 1− x O x (OH) 2− x during the electro‐chemical pre‐activation process, thus affecting the integral ammonia oxidation reaction (AOR) reactivity. Herein, the rational design of hierarchical porous NiCu double hydroxide nanotyres (NiCu DHTs) was reported for the first time by considering hydroxyl‐rich interfaces to promote pre‐activation efficiency and intrinsic structural superiority (i.e., annulus, porosity) to accelerate AOR kinetics. A systematic investigation of the structure–function relationship was conducted by manipulating a series of NiCu DHs with tunable intercalations and morphologies. Remarkably, the NiCu DHTs exhibit superior AOR activity (onset potential of 1.31 V with 7.52 mA cm −2 at 1.5 V) and high ammonia sensitivity (detection limit of 9 μ m ), manifesting one of the best non‐noble metal AOR electrocatalysts and electro‐analytical electrodetectors. This work deepens the understanding of the crucial role of surface hydroxyl groups on determining the catalytic performance in alkaline medium.