Photoelectrochemical CO2 reduction by Cu2O/Cu2S hybrid catalyst immobilized in TiO2 nanocavity arrays
Photoelectrochemical CO2 reduction by Cu2O/Cu2S hybrid catalyst immobilized in TiO2 nanocavity arrays
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固定在 TiO2 纳米腔阵列中的 Cu2O/Cu2S 混合催化剂光电化学还原 CO2
DOI：
10.1007/s10853-019-03615-4
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发表时间：
2019-07-01
影响因子：
4.5
通讯作者：
Bi, Ke
中科院分区：
文献类型：
--
作者：
Guo, Limin;Cao, Jinqing;Bi, Ke
将Cu 2 O/Cu 2S纳米粒子固定在TiO 2纳米腔阵列中，实现了CO2光电催化还原为CO。以Na 2S为前驱体，采用化学气相沉积法，通过O2-和S2-在Cu 2 O表面的离子交换反应得到Cu 2S壳层。该涂层可以保护Cu 2 O纳米颗粒在光腐蚀期间免受光腐蚀。较低的电阻和等离子体吸收赋予了Cu 2 O/Cu 2S异质结构对CO2光电化学还原的上级活性。在过电位为-0.26V时，电流密度为10.7mA·cm ~（-2），CO法拉第效率（FE）大于81%。Cu 2S涂层的局域表面等离子体共振和Cu 2 O/Cu 2S纳米粒子的高度有序的分级结构有利于载流子的分离和传质，从而使Cu 2S具有优异的光助催化性能（光诱导电流增量大于50%）。这些混合电极通过在5小时内抵抗光腐蚀而表现出长期稳定性，具有较高的CO2至CO转化率。
Photoelectrocatalytic CO2 reduction to CO was achieved on Cu2O/Cu2S nanoparticles which are immobilized in TiO2 nanocavity array. The Cu2S shell was obtained by ions exchange reaction of O2- and S2- on the surface of Cu2O by a chemical vapor deposition with Na2S precursor. This coating can protect the Cu2O nanoparticle from photocorrosion during photocatalysis. The lower resistance and plasmonic absorbance endow a superior activity of the Cu2O/Cu2S heterostructures toward photoelectrochemical reduction of CO2. It exhibits a current density of 10.7 mA cm(-2) at the overpotential of - 0.26 V with a CO faradaic efficiency (FE) higher than 81%. The excellent photo-assisted catalytic performance (photo-induced current increment is more than 50%) is attributed to the localized surface plasmonic resonance of Cu2S coatings and highly ordered hierarchical structure of the Cu2O/Cu2S nanoparticles, which facilitate charge carrier separation and mass transfer. These hybrid electrodes demonstrate a long-term stability by resisting photocorrosion within 5 h with a higher FE of CO2 to CO conversion.