镍
催化作用
阳极
纳米颗粒
材料科学
电流密度
阴极
吸附
纳米技术
化学工程
无机化学
化学
物理化学
电极
冶金
生物化学
工程类
物理
量子力学
作者
Wenhao Ren,Xin Tan,Chen Jia,Anna Krammer,Qian Sun,Jiangtao Qu,Sean C. Smith,Andreas Schueler,Xile Hu,Chuan Zhao
标识
DOI:10.1002/anie.202203335
摘要
Modulating the electronic structure of atomically dispersed active sites is promising to boost catalytic activity but is challenging to achieve. Here we show a cooperative Ni single-atom-on-nanoparticle catalyst (NiSA/NP) prepared via direct solid-state pyrolysis, where Ni nanoparticles donate electrons to Ni(i)-N-C sites via a network of carbon nanotubes, achieving a high CO current density of 346 mA cm-2 at -0.5 V vs RHE in an alkaline flow cell. When coupled with a NiFe-based anode in a zero-gap membrane electrolyzer, the catalyst delivers an industrially relevant CO current density of 310 mA cm-2 at a low cell voltage of -2.3 V, corresponding to an overall energy efficiency of 57 %. The superior CO2 electroreduction performance is attributed to the enhanced adsorption of key intermediate COOH* on the electron-rich Ni single atoms, as well as a high density of active sites.
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