NiS1.97: A New Efficient Water Oxidation Catalyst for Photoelectrochemical Hydrogen Generation

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• 作者：Reshma Bhosale ; Sarika Kelkar ; Golu Parte ; Rohan Fernandes ; Dushyant Kothari ; Satishchandra Ogale
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：20053-20060
• 全文大小：508K
• ISSN：1944-8252

文摘

NiS_1.97, a sulfur-deficient dichalcogenide, in nanoscale form, is shown to be a unique and efficient photoelectrochemical (PEC) catalyst for H₂ generation by water splitting. Phase pure NiS_1.97 nanomaterial is obtained by converting nickel oxide into sulfide by controlled sulfurization method, which is otherwise difficult to establish. The defect states (sulfur vacancies) in this material increase the carrier density and in turn lead to favorable band line-up with respect to redox potential of water, rendering it to be an effective photoelectrochemical catalyst. The material exhibits a remarkable PEC performance of 1.25 mA/cm² vs NHE at 0.68 V in neutral pH, which is almost 1000 times superior as compared with that of the stoichiometric phase of NiS₂. The latter is well-known to be a cocatalyst but not as a primary PEC catalyst.