催化作用
甲酸
吸附
法拉第效率
电解质
电化学
化学
无机化学
氧化还原
反应中间体
傅里叶变换红外光谱
物理化学
化学工程
电极
有机化学
工程类
作者
Bin Sun,Zaiqi Li,Difei Xiao,Hongli Liu,Kepeng Song,Zeyan Wang,Yuanyuan Liu,Zhaoke Zheng,Peng Wang,Ying Dai,Baibiao Huang,Arne Thomas,Hefeng Cheng
标识
DOI:10.1002/anie.202318874
摘要
The acidic electrochemical CO2 reduction reaction (CO2RR) for direct formic acid (HCOOH) production holds promise in meeting the carbon‐neutral target, yet its performance is hindered by the competing hydrogen evolution reaction (HER). Understanding the adsorption strength of the key intermediates in acidic electrolyte is indispensable to favor CO2RR over HER. In this work, high‐density Sn single atom catalysts (SACs) were prepared and used as catalyst, to reveal the pH‐dependent adsorption strength and coverage of *CO2− intermediates that enables enhanced acidic CO2RR towards direct HCOOH production. At pH = 3, Sn SACs could deliver a high Faradaic efficiency (90.8%) of HCOOH formation and a corresponding partial current density up to –178.5 mA cm−2. The detailed in situ attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectroscopic studies reveal that a favorable alkaline microenvironment for CO2RR to HCOOH is formed near the surface of Sn SACs, even in the acidic electrolyte. More importantly, the pH‐dependent adsorption strength of *CO2− intermediates is unravelled over the Sn SACs, which in turn affects the competition between HER and CO2RR in acidic electrolyte.
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