Synergetic Effect of Metal Nickel and Graphene As a Cocatalyst for Enhanced Photocatalytic Hydrogen Evolution Via Dye Sensitization

Overview

Journal Sci Rep

Specialty Science

Date 2015 Jun 13

PMID 26068540

Citations 3

Authors

Weiying Zhang

Yuexiang Li

Xianping Zeng

Shaoqin Peng

Affiliations

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Abstract

Exploiting new, low-cost and efficient electrocatalysts for hydrogen evolution reaction (HER) is important to resolve the energy crisis and environment pollution. In this work, graphene decorated with Ni nanoparticles (NPs) were synthesized via one-pot reduction using graphene oxide (GO, the obtained composite was denoted as GN) as a precursor. The as-prepared composite GN exhibits much better electrocatalytic and dye-sensitized HER activities than single Ni and reduced graphene oxide (RGO), namely, a great synergetic effect of RGO and Ni for HER. The coupling of metal Ni with the defect carbons of RGO plays a key role in the synergetic effect. The structure of GN composites is another key factor to the synergetic effect. The highest apparent quantum yield (AQY) for dye-sensitized photocatalytic hydrogen evolution at 470 nm reaches 30.3% under the optimal conditions.

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