N,Cu-Codoped Carbon Nanosheet/Au/CuBi2O4 Photocathodes for Efficient Photoelectrochemical Water Splitting
N,Cu-Codoped Carbon Nanosheet/Au/CuBi2O4 Photocathodes for Efficient Photoelectrochemical Water Splitting
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DOI：
10.1021/acssuschemeng.7b04133
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发表时间：
2018-06-01
影响因子：
8.4
通讯作者：
Jin, Jun
中科院分区：
文献类型：
--
作者：
Xu, Na;Li, Feng;Jin, Jun
本论文成功制备了CuBi 2 O 4与Au纳米颗粒连接的氮、铜共掺杂碳纳米片（N，Cu-C）异质结构，并首次将其应用于光电化学（PEC）水裂解。通过简单的光还原在材料表面进行了Au纳米颗粒的原位修饰。由于Au纳米粒子的等离子体共振效应和较低的电荷转移电阻，CuBi 2 O 4/Au/N，Cu-C杂化材料的光电流比传统的CuBi 2 O 4和CuBi 2 O 4/N，Cu-C有明显的增强。典型地，所制备的光电极显示出最佳的光电转换（0.17%，在0.4 V vs RHE下）和PEC光电流（0.31 mA cm（-2），在100 mW cm（-2）和0.5 V vs RHE下），其为纯CuBi 2 O 4的约5倍。增强的PEC水裂解能力可以主要归因于N，Cu共掺杂的碳纳米片作为钝化层和Au纳米颗粒作为电子传递的电子中继器和用于增加光吸收的等离子体光敏剂。
In this paper, we successfully fabricated CuBi2O4 and nitrogen,cuprum-codoped carbon nanosheet (N,Cu-C) heterostructure connected by Au nanoparticles, which was applied in photoelectrochemical (PEC) water splitting for the first time. The Au nanoparticle in situ decoration on the material surface was carried out by simple photoreduction. Owing to the plasmon resonance effect and low charge transfer resistance of Au nanoparticles, CuBi2O4/Au/N,Cu-C hybrids exhibited enhanced photo current compared with traditional CuBi2O4 and CuBi2O4/N,Cu-C. Typically, the as-prepared photoelectrode displayed an optimal photoelectric conversion (0.17%, at 0.4 V vs RHE) and PEC photocurrent (0.31 mA cm(-2), at 100 mW cm(-2) and 0.5 V vs RHE) that is about 5 times that of pure CuBi2O4. The enhanced PEC water splitting ability can be mainly attributed to the N,Cu-codoped carbon nanosheets as the passivation layer and Au nanoparticles as an electron relay for electron transport and a plasmonic photosensitizer for increased light absorption.