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Li, Qianqian; Huang, Fangzhi; Li, Shikuo; Zhang, Hui; Yu, Xin‐Yao
Small (Weinheim an der Bergstrasse, Germany), 01/2022, Letnik: 18, Številka: 2Journal Article
With the development of clean hydrogen energy, the cost effective and high‐performance hydrogen evolution reaction (HER) electrocatalysts are urgently required. Herein, a green, facile, and time‐efficient Ru doping synergistic with air‐plasma treatment strategy is reported to boost the HER performance of CoNi‐layered double hydroxide (LDH) nanotube arrays (NTAs) derived from zeolitic imidazolate framework nanorods. The Ru doping and air‐plasma treatment not only regulate the oxygen vacancy to optimize the electron structure but also increase the surface roughness to improve the hydrophilicity and hydrogen spillover efficiency. Therefore, the air plasma treated Ru doped CoNi‐LDH (P‐Ru‐CoNi‐LDH) nanotube arrays display superior HER performance with an overpotential of 29 mV at a current density of 10 mA cm−2. Furthermore, by assembling P‐Ru‐CoNi‐LDH as both cathode and anode for two‐electrode urea‐assisted water electrolysis, a small cell voltage of 1.36 V is needed at 10 mA cm−2 and can last for 100 h without any obvious activity attenuation that showing outstanding durability. In general, the P‐Ru‐CoNi‐LDH can improve the HER performance from intrinsic electronic structure regulation cooperated with extrinsic surface wettability modification. These findings provide an effective intrinsic and extrinsic synergistic effect avenue to develop high performance HER electrocatalysts, which is potential to be applied to other research fields. With the Ru‐doping in CoNi‐LDH, the air‐plasma treatment was tend to introduce appropriate O and N filling that can effectively regulate the electronic structure. What's more, the plasma treatment also increases the superwettability of the samples which facilitate the H2 spillover process. The synergistically regulation of the intrinsic electronic structure and interface wettability of CoNi‐LDH can boost the HER process.
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