Non-precious Metals Co5.47N/Nitrogen-doped rGO Co-catalyst Enhanced Photocatalytic Hydrogen Evolution Performance of TiO2

doi:10.15541/jim20210267

Abstract

Abstract:

Developing a highly efficient and stable photocatalyst or co-catalyst is one of the important topics in the field of photocatalysis research. In this study, graphene oxide, cobalt chloride and 2-methylimidazole were used as precursors to prepare Co_5.47N-loaded nitrogen-doped reduced graphene oxide (Co_5.47N/N-rGO) co- catalyst by combining liquid phase method and nitridation in flowing NH₃ where Co_5.47N with a crystallite size of 10~20 nm was highly dispersed over N-rGO surface. The Co_5.47N/N-rGO co-catalyst significantly improves the hydrogen evolution performance of commercial nano TiO₂ (P25). When the mass percent of Co_5.47N/N-rGO was 25%, the hydrogen evolution rate of the obtained sample reached 11.71 mmol·h ^-1·g ^-1, which was 90 times higher than that of pure P25 and similar to that loaded noble metal Pt (11.88 mmol·h ^-1·g ^-1). Furthermore, the catalyst also has good stability. The research provides a new idea for the future development of efficient non-precious metal co-catalysts.

Key words: Co_5.47N, nitrogen-doped graphene, TiO₂, photocatalytic hydrogen evolution, co-catalyst

CLC Number:

TQ174

AN Lin, WU Hao, HAN Xin, LI Yaogang, WANG Hongzhi, ZHANG Qinghong. Non-precious Metals Co_5.47N/Nitrogen-doped rGO Co-catalyst Enhanced Photocatalytic Hydrogen Evolution Performance of TiO₂[J]. Journal of Inorganic Materials, 2022, 37(5): 534-540.

Figures/Tables 7

Fig. 1 XRD patterns of P25 and P25/NGCo-x

Fig. 2 UV-Vis diffuse reflectance absorption spectra and corresponding pictures of P25, NGCo and P25/NGCo-x

Fig. 3 TEM image (a), HRTEM images (b-e) and EDS elemental mappings (f-j) of P25/NGCo-25

Fig. 4 XPS survey spectrum (a) and high-resolution XPS spectra of Co2p (b), C1s (c), and N1s (d) for P25/NGCo-25

Fig. 5 Photocatalytic hydrogen evolution of P25, NGCo, P25/NGCo-x, P25/Pt, and P25/NG-25 under 300 W Xe lamp (a), hydrogen evolution of P25/NGCo-25 under different light sources (b), corresponding histogram of hydrogen evolution rates (c) and cycling test of P25/NGCo-25 (d)

Fig. 6 Transient photocurrent response curves (a) and electrochemical impedance spectra (EIS) (b) of P25 and P25/NGCo-25 with inset in (b) showing an enlarged view of P25/NGCo-25

Fig. 7 Schematic diagram of photocatalytic hydrogen evolution mechanism for P25/NGCo-x

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Non-precious Metals Co_5.47N/Nitrogen-doped rGO Co-catalyst Enhanced Photocatalytic Hydrogen Evolution Performance of TiO₂

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