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. 2019 Sep 5;10:4011. doi: 10.1038/s41467-019-11848-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Surface adsorption properties of HEA-Co_xMo_y. a Nitrogen TPD profiles recorded with a temperature ramping rate of 10 ^oC min⁻¹. b, c Estimation of the nitrogen adsorption energies (ΔE_N) for the HEA-Co_xMo_y catalysts by using the plots of Ln(β/T²) ~ 1/T for the nitrogen TPD profiles (β = 10, 20, and 30 ^oC min⁻¹ represents the ramping rates used for the TPD measurements). d, e Correlations between ΔE_N and catalytic activities (d) and E_app (e) showing a volcano-type behavior for the HEA-Co_xMo_y catalysts, with HEA-Co₂₅Mo₄₅ being close to the peak position. f Plots of the NH₃ and H₂ reaction orders (at 425 ^oC) versus the nitrogen adsorption energies. Error bars denote SDs