期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 45, 页码 39161-39167出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11970
关键词
Ir; g-C3N4; NG; water splitting; acidic electrolyte
资金
- Ministry of Science and Technology of China [2017YFA0204800]
- 111 project
- Natural Science Research Project of Anhui Province Education Department [KJ2017A350, AQKJ2015B001]
- National Natural Science Foundation of China [21501004]
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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