Insights into Boosting Photoelectrochemical Performance Over Cu 3 (BTC) 2 Passivated Cu 2 O Nanorod Arrays
Insights into Boosting Photoelectrochemical Performance Over Cu 3 (BTC) 2 Passivated Cu 2 O Nanorod Arrays
复制标题
提高 Cu 3 (BTC) 2 钝化 Cu 2 O 纳米棒阵列光电化学性能的见解
DOI：
10.1002/adsu.202200272
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发表时间：
2022
影响因子：
7.1
通讯作者：
Shengwei Liu
中科院分区：
文献类型：
--
作者：
Meng Ye;Xi Wu;Chuanhao Li;Bo Song;Xinzhou Ma;Shengwei Liu
地球资源丰富的Cu 2 O是一种很有前途的光电化学（PEC）水裂解光阴极材料。然而，严重的光腐蚀和低效率阻碍了它的实际应用。本文中，通过原位表面/界面生长在Cu 2 O纳米棒阵列（NRARs）光阴极上生长多孔Cu基金属有机框架材料Cu 3（BTC）2作为表面钝化层。优化后的Cu 2 O/Cu 3（BTC）2NRARs在可见光照射下的光电流密度为2.73 mA cm-2（0 VRHE），比传统的Cu 2 O光电阴极高出一倍，最大入射光子转换电子（IPCE）效率达到45%（450 nm）。结果表明，Cu 3（BTC）2层协同钝化界面缺陷，在Cu 2 O/Cu 3（BTC）2界面形成p-n结，引入催化析氢反应（HER）的活性位，提高了电荷分离、转移和利用效率.此外，Cu 2 O/Cu 3（BTC）2界面的加速电荷动力学和Cu 3（BTC）2的空穴清除能力抑制了Cu 2 O的氧化型光腐蚀，同时，Cu 2 O/Cu 3（BTC）2界面的还原型光腐蚀也通过催化水还原反应竞争光电子和维持平衡的“Cu 2+（Cu+）/Cu 0”循环而减弱。
Earth‐abundant Cu2O is a promising photocathode material for photoelectrochemical (PEC) water splitting. However, the serious photocorrosion and low efficiency retard its practical applications. Herein, a porous Cu‐based metal–organic framework material, Cu3(BTC)2, as surface passivation layer is grown on Cu2O nanorod arrays (NRARs) photocathode by in situ surface/interfacial growth. Compared to conventional Cu2O photocathodes, the optimized Cu2O/Cu3(BTC)2NRARs exhibit two times higher photocurrent density, ≈2.73 mA cm−2at 0 VRHEunder visible light irradiation, and the maximum incident photon to converted electron (IPCE) performance reaches 45% (450 nm). It is demonstrated that the Cu3(BTC)2layer synergistically passivates interfacial defects, forms p–n junctions at the Cu2O/Cu3(BTC)2interface, and introduces active sites catalyzing the hydrogen evolution reaction (HER), improving charge separation, transfer, and utilization efficiency. Moreover, the oxidative Cu2O photocorrosion is inhibited owing to the accelerated charge dynamics at the Cu2O/Cu3(BTC)2interface and the hole‐scavenging ability of Cu3(BTC)2, meanwhile, reductive Cu2O photocorrosion at Cu2O/Cu3(BTC)2is also attenuated by catalyzing the water reduction reaction that competes for photoelectrons and sustaining balanced “Cu2+(Cu+)/Cu0” cycles.