Integrating Co(OH)₂ nanosheet arrays on graphene for efficient noble-metal-free EY-sensitized photocatalytic H₂ evolution

Abstract

The development of efficient noble-metal-free cocatalyst is the key for the photocatalytic hydrogen production technology. In this paper, hierarchical Co(OH)2 nanosheet arrays-graphene (GR) composite cocatalyst have been developed. With Eosin...

Photocatalytic Conversion of Diluted CO2 into Tunable Syngas via Modulating Transition Metal Hydroxides

“…38–0715), respectively, and the diffraction peaks of Co­(OH) 2 at 12.2, 25.4, 33.9, and 60.3° can be indexed to the (003), (006), (100), and (110) planes of α-Co­(OH) 2 (JCPDS No. 46–0605), respectively . It is noteworthy that the positions of the (003) and (006) diffraction peaks of the transition metal hydroxide are shifted compared to the standard card, which is because types and amounts of intercalated ions are different, and similar phenomena can be seen in the previous report. , As shown in Figure b, the Raman spectrum has been used to confirm the existence of GR, and peaks at 1398 and 1650 cm –1 are assigned to the D-band and G-band of GR, respectively .…”

“…46–0605), respectively . It is noteworthy that the positions of the (003) and (006) diffraction peaks of the transition metal hydroxide are shifted compared to the standard card, which is because types and amounts of intercalated ions are different, and similar phenomena can be seen in the previous report. , As shown in Figure b, the Raman spectrum has been used to confirm the existence of GR, and peaks at 1398 and 1650 cm –1 are assigned to the D-band and G-band of GR, respectively . The detailed chemical components and valence states of the Ni 0.6 Co 0.4 -GR hybrid were investigated by X-ray photoelectron spectroscopy (XPS).…”

“…The crystal structure of Ni(OH) 2 and Co(OH) 2 in Ni X Co 1−X -GR composites is confirmed by X-ray diffraction (XRD). 23,24 As shown in Figure 1a, the diffraction peaks of Ni(OH) 2 at 12.5, 25 It is noteworthy that the positions of the (003) and (006) diffraction peaks of the transition metal hydroxide are shifted compared to the standard card, which is because types and amounts of intercalated ions are different, and similar phenomena can be seen in the previous report. 22,26 As shown in Figure 1b, the Raman spectrum has been used to confirm the existence of GR, and peaks at 1398 and 1650 cm −1 are assigned to the D-band and G-band of GR, respectively.…”

“…22,26 As shown in Figure 1b, the Raman spectrum has been used to confirm the existence of GR, and peaks at 1398 and 1650 cm −1 are assigned to the D-band and G-band of GR, respectively. 25 The detailed chemical components and valence states of the S2, Supporting Information), in which the ratio of Ni and Co is demonstrated to be 6.4:4, approximating the theoretical value for these elements. The morphologies of different materials were investigated by scanning electron microscopy (SEM).…”

Rational Photodeposition of Cobalt Phosphate on Flower-like ZnIn2S4 for Efficient Photocatalytic Hydrogen Evolution

“…Moreover, as presented in Figure 3 d, the peaks of 162.9 and 161.7 eV belong to S 2p 1/2 and S 2p 3/2 , confirming the presence of S 2− . In the XPS spectrum of Co 2p ( Figure 3 e), the peak of Co 2p 3/2 is at 781.3 eV (satellite peak at 784.3 eV), indicating the presence of Co 2+ in the Z5CP composite [ 43 , 44 , 45 ]. In addition, the peak of P 2p ( Figure 3 f) at 133.5 eV indicates that P presents in the form of phosphate groups, which further proves the successful synthesis of Z5CP [ 46 ].…”