AI Article Synopsis
- The study examines how controlling the structure of NiCoO nanoplates and doping with elements can enhance their performance as catalysts for the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and water splitting.
- It reports achieving low overpotentials of 262 mV for OER and 210 mV for HER at a current density of 10 mA/cm² using a NiCoO/TiCT-HT catalyst in a KOH solution, which outperforms traditional RuO-Pt/C catalysts.
- The research highlights the importance of interfacial assembly of transition-metal oxides with MXenes, revealing that optimal Ni doping leads to a more active catalyst surface and better generation of critical intermediate products for efficient
Article Abstract
This study highlights the facet structure control of regular NiCoO nanoplates and interfacial modulation through elemental doping and morphologically fitted assembly of TiCT nanosheets for high performances in OER/HER and overall water splitting. Over the resulting NiCoO/TiCT-HT in a solution of 1 M KOH, the OER and HER overpotentials of 262 and 210 mV, respectively, are achievable at a current density of 10 mA cm. In the case of the overall water splitting by using NiCoO/TiCT-HT as anode and cathode catalysts, only a potential of 1.66 V is needed to obtain a current density of 10 mA cm, and the catalysts can stand for a period of 70 h, remarkably outperforming the RuO-Pt/C-based catalyst and benefiting from the intensive association and interfacial function between the TiCT and NiCoO nanosheets. Interestingly, a surface reconstruction from the (112) to (111) facet structure occurred upon the fine-tuned Ni doping of regular NiCoO hexagonal nanoplates and led to a highly active catalyst surface. At = 0.09, the amount of Ni becomes the highest, which is favorable for the generation of the critical OH intermediates on NiCoO/TiCT-HT. The current study documented the significance of the well-controlled interfacial assembly of transition-metal oxide/MXenes as an effective electrocatalyst in the OER/HER and overall water splitting processes and provided the insights into the structure-performance correlation over such kinds of precious metal-free catalysts.
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| http://dx.doi.org/10.1021/acsami.1c08032 | DOI Listing |
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