Preparation of Ni-loaded oxygen-enriched vacancy TiO_2−x hierarchical micro-nanospheres and the study of their photocatalytic hydrogen evolution performance

Abstract

The introduction of oxygen vacancies (Ov) in TiO2 has significant effects on improving light absorption capacity, expanding light absorption range and inhibiting photo-generated charge recombination. Here, we used hydrochloric acid...

ALD-Deposited NiO Approaches the Performance of Platinum as a Hydrogen Evolution Cocatalyst on Carbon Nitride

“…The peaks observed at around 862 and 880 eV are shakeup satellites of the Ni 2p 3/2 and Ni 2p 1/2 peaks, respectively . After the HER, the NiO component in ALD-derived NiO/CN x dominates the Ni 2p spectrum, and the Ni II species in Ni/CN x and Ni/TiO 2 arise from both NiO and Ni­(OH) 2 . , The peak approaching 850 eV in Figure d–f confirms the presence of Ni 0 in samples that underwent the HER. ,, As estimated by the peak area, it was noticed that NiO(65)/CN x after the HER has the highest amount of Ni 0 species (7%), followed by Ni/CN x after the HER (5%), and finally Ni/TiO 2 after the HER (2%). The trend in the amount of Ni 0 species in the samples conforms with the trend in the HER activity, strongly suggesting that the activity difference among NiO/CN x samples is caused by the different Ni 0 content.…”

“…61,62 With the Ni component, metal− oxygen peaks appear (Figure S17b 66 After the HER, the NiO component in ALD-derived NiO/CN x dominates the Ni 2p spectrum, 67 and the Ni II species in Ni/CN x and Ni/TiO 2 arise from both NiO and Ni(OH) 2 . 68,69 The peak approaching 850 eV in Figure 8d−f confirms the presence of Ni 0 in samples that underwent the HER. 61,70,71 As estimated by the peak area, it was noticed that NiO(65)/CN x after the HER has the highest amount of Ni 0 species (7%), followed by Ni/CN x after the HER (5%), and finally Ni/TiO 2 after the HER (2%).…”

Electroless Ni plated nanostructured TiO2 as a photocatalyst for solar hydrogen production

“…4b). 41,50 The binding energy difference between Ti 2p 1/2 and Ti 2p 3/2 was 5.68 eV, attributable to characteristic Ti–O bond of TiO 2 . 50 The O 1s XPS spectra of 0.1% Ni loaded TiO 2 nanopowders was shown in Fig.…”

“…Various approaches have been ventured to overcome the drawbacks associated with TiO 2 such as doping (for example with transition metal cations like Cr 3+ , Fe 2+ , Ni 2+ and Rh 3+ , etc. ) 20,21 and use of noble metals (Pt, 22,23 Pd, Rh, 24,25 Ag and Au 26,27 ) and transition metals like Ni, Cu, Zn, Mn, etc. as co-catalysts.…”

“…So far, many different methods, including molten-salt-mediated process, 44 precipitation, 45 solvothermal, 46,47 sol–gel, 48 electrodeposition, 49 and chemical reduction, 39 have been reported for synthesis of Ni@TiO 2 systems. 50 In this context, electroless plating which is generally used for metallization of work-pieces at macro scale, has unexpectedly emerged as a superior wet-chemical nanofabrication alternative. 25…”