DataVXACS Applied Materials & InterfacesPaper
journal article·2018-11-14

Ir/g-C3N4/Nitrogen-Doped Graphene Nanocomposites as Bifunctional Electrocatalysts for Overall Water Splitting in Acidic Electrolytes

Binbin Jiang, Tao Wang, Yafei Cheng, Fan Liao, Konglin Wu, Mingwang Shao

ACS Applied Materials & Interfaces· Volume 10· Issue 45
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Source abstract

Abstract

Nitrogen-doped graphene (NG) chemically coupled with graphitic carbon nitride (g-C3N4) may facilitate the kinetics of overall electrochemical water splitting. Herein, a facile strategy is adopted to synthesize monodispersed Ir nanoparticles on g-C3N4/NG layers. Benefiting from the synergistic effect between different components of the catalyst, the optimal Ir/g-C3N4/NG catalyst with a low content of Ir (5.9 wt %) exhibits highly active for electrochemical water splitting in acidic electrolyte. Specifically, as a hydrogen evolution reaction catalyst, the optimal Ir/g-C3N4/NG exhibits a Tafel slope of 22 mV·dec–1. The optimal catalyst requires an overpotential of 22 mV to reach the current density of 10 mA·cm–2, the value of which is superior to Ir/NG (32 mV) and 20 wt % Pt/C (28 mV) catalysts; as an oxygen evolution reaction catalyst, it also achieve the Tafel slope of only 72.8 mV·dec–1. At the overpotential of 300 mV, the mass activity of the optimal Ir/g-C3N4/NG catalyst is 2.8 times as large as that of 5.7 wt % Ir/NG catalyst. More significantly, as a bifunctional catalyst, the optimal Ir/g-C3N4/NG achieves a current density of 10 mA·cm–2 with a potential of only 1.56 V and displays good stability for overall water splitting. This work provides a new strategy to design highly efficient acidic catalysts for electrochemical overall water splitting.
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Research context

Energy storageNanomaterialsCatalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Fuel Cells and Related Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Provincial Key Laboratory of Functional Coordination Compounds and Nanomaterials, School of Chemistry and Chemical Engineering, Anqing Normal University, Anqing 246001, P. R. China

Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, P. R. China

Center of Single-Atom, Clusters and Nanomaterials (CAN), Key Laboratory of Functional Molecular Solids, the Ministry of Education, Anhui Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241002, P. R. China

Funding

State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Anhui Department of Education · Collaborative Innovation Center of Suzhou Nano Science and Technology, Sochoow University · Priority Academic Program Development of Jiangsu Higher Education Institutions

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