材料科学
双功能
电化学
催化作用
分解水
离解(化学)
化学工程
无机化学
金属有机骨架
钌
双功能催化剂
层状双氢氧化物
吸附
析氧
纳米技术
纳米颗粒
电催化剂
作者
Ying Wang,Shuo Wang,Ze-Lin Ma,Li-Ting Yan,Xue-Bo Zhao,Ying-Ying Xue,Jia-Min Huo,Xiao Yuan,Shu-Ni Li,Quan-Guo Zhai
标识
DOI:10.1002/adma.202107488
摘要
Rational exploration of efficient, inexpensive, and robust electrocatalysts is critical for the efficient water splitting. Conjugated conductive metal-organic frameworks (cMOFs) with multicomponent layered double hydroxides (LDHs) to construct bifunctional heterostructure catalysts are considered as an efficient but complicated strategy. Here, the fabrication of a cMOF/LDH hetero-nanotree array catalyst (CoNiRu-NT) coupled with monodispersed ruthenium (Ru) sites via a controllable grafted-growth strategy is reported. Rich-amino hexaiminotriphenylene linkers coordinate with the LDH nanotrunk to form cMOF nanobranches, providing numerous anchoring sites to precisely confine and stabilize RuN4 sites. Moreover, monodispersed and reduced Ru moieties facilitate H2 O adsorption and dissociation, and the heterointerface between the cMOF and the LDH further modifies the chemical and electronic structures. Optimized CoNiRu-NT displays a significant increase in electrochemical water-splitting properties in alkaline media, affording low overpotentials of 22 mV at 10 mA cm-2 and 255 mV at 20 mA cm-2 for the hydrogen evolution reaction and oxygen evolution reaction, respectively. In an actual electrochemical system, CoNiRu-NT drives an overall water splitting at a low cell voltage of 1.47 V to reach 10 mA cm-2 . This performance is comparable to that of pure noble-metal-based materials and superior to most reported MOF-based catalysts.
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