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|Title:||O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting||Authors:||Dinh, Khang Ngoc
|Keywords:||Engineering::Materials||Issue Date:||2018||Source:||Dinh, K. N., Sun, X., Dai, Z., Zheng, Y., Zheng, P., Yang, J., . . . Yan, Q. (2018). O2 plasma and cation tuned nickel phosphide nanosheets for highly efficient overall water splitting. Nano Energy, 54, 82-90. doi:10.1016/j.nanoen.2018.10.004||Journal:||Nano Energy||Abstract:||Here we present a novel combined-strategy of cation tuning and surface engineering for the fabrication of highly active, earth-abundant, and robust two-dimensional Ni2P electrocatalyst. The nanosheets have lateral sizes of few hundred nm with thicknesses of ~6 nm. Our theoretical calculations suggest the effectiveness of vanadium doping and oxygen plasma, which do not only enhance the density-of-state at Fermi level, but also make the Ni sites more susceptible to OH− adsorption. The oxygen plasma treatment can increase the wettability of the catalyst toward KOH solution, improving the contact angle from 44.95° to 16.8° and also induce a higher BET surface area; hence, more active sites and lower charge transfer resistance are obtained. As a result, the catalyst requires small overpotentials of 257 and 108 mV to drive ±10 mA cm−2 alongside with modest Tafel slope of 43.5 and 72.3 mV dec−1 for oxygen evolution reaction and hydrogen evolution reaction in 1.0 M KOH solution, respectively. When employed for overall water splitting, the catalyst demonstrates a low voltage of 1.56 V to achieve 10 mA cm−2 with good stability and durability, outperforming the state-of-the-art IrO2 || Pt/C which needs 1.69 V. This work opens a new approach to engineer low-cost monometallic phosphides for highly efficient water splitting.||URI:||https://hdl.handle.net/10356/139071||ISSN:||2211-2855||DOI:||10.1016/j.nanoen.2018.10.004||Rights:||© 2018 Elsevier Ltd. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||ERI@N Journal Articles|
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