点击次数：

论文类型：期刊论文

发表时间：2016-08-01

发表刊物：66th ISE Satellite Annual Meeting on New Devices for Energy Conversion and Storage

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：46

期号：8,SI

页面范围：807-817

ISSN号：0021-891X

关键字：TiO2 nanowire arrays; Graphitic carbon nitride; Photoelectrochemical; Water splitting

摘要：A novel structure composed of TiO2 nanowire arrays (NWAs) was designed and synthesized by decorating with graphene-linked graphitic carbon nitride (GCN) layers. It serves as a robust photoanode for high-performance solar-driven water splitting in an alkaline solution. The GCN layers were deposited on TiO2 NWAs by a facile electrophoretic method, producing an interconnected two-dimensional GCN nanosheets/one-dimensional TiO2 NWAs heterostructure. Under simulated solar light illumination (light intensity 100 mW cm(-2)), the optimal GCN/TiO2 NWAs photoelectrode produces a photocurrent density of 1.7 mA cm(-2) at 1.23 V versus reversible hydrogen electrode (RHE), which is around 2.6 times enhancement from that of pristine TiO2 (0.7 mA cm(-2) at 1.23 V vs. RHE). The photo-conversion efficiency of GCN/TiO2 NWAs is up to 0.92 % at a low bias potential 0.50 V versus RHE, 3.6 times higher than pristine TiO2 (0.27 % at 0.59 V vs. RHE). The improved photoelectrochemical activity is mainly because of the improved charge separation and transport within the heterojunction as well as enhanced light absorption.