Hydrogen generation from alkaline NaBH<inf>4</inf>solution using electroless-deposited Co–Ni–W–P/γ-Al<inf>2</inf>O<inf>3</inf>as catalysts
- Key Words:X ray photoelectron spectroscopy;Activation energy - Atomic emission spectroscopy - Catalyst activity - Catalysts - Deposition - Electroless plating - Energy dispersive spectroscopy - Field emission microscopes - Hydrogen production - Hydrolysis - Inductively coupled plasma - Nickel - Scanning electron microscopy - Sodium - Tungsten - X ray diffraction - X ray spectroscopy;Catalytic properties - Electroless deposition time - Energy dispersive X ray spectroscopy - Field emission scanning electron microscopy - Hydrogen generations - Inductively coupled plasma-atomic emission spectrometry - NaBH<inf>4</inf> - Solution temperature
- Abstract:Co–Ni–W–P catalysts were synthesised onto γ-Al<inf>2</inf>O<inf>3</inf>by electroless deposition. The obtained Co–Ni–W–P/γ-Al<inf>2</inf>O<inf>3</inf>were characterised by field emission scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES) and X-ray photoelectron spectroscopy (XPS). The catalytic properties of Co–Ni–W–P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts for hydrolysis of sodium borohydride solution were investigated by varying Na<inf>2</inf>WO<inf>4</inf>concentration, electroless deposition time, NaOH and NaBH<inf>4</inf>concentrations as well as solution temperature. The results show that the Co–Ni–W–P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts obtained exhibit better catalytic activity than Co–Ni–P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts. Further, Co–Ni–W–P/γ-Al<inf>2</inf>O<inf>3</inf>catalysts also exhibit favourable cycling performance and lower activation energy (49.19 kJ mol<sup>−1</sup>) for the hydrolysis process. © 2017 Elsevier B.V.
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