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DOE OSTI · 3374267

Co 2 P-Pt Heterostructure Interfaces for Electrocatalytic Hydrogen Evolution

Musikanth, Daniel P. [University of Virginia, Charlottesville, VA (United States)] (ORCID:0009000046038977)·Kwon, Soonho [California Institute of Technology, Pasadena, CA (United States); Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000292253018)·Xie, Zhenhua [Columbia University, New York, NY (United States)] (ORCID:0000000337378894)·Chen, Yizhen [University of Virginia, Charlottesville, VA (United States)] (ORCID:0000000284992013)·Hwang, Sooyeon [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000156066728)·Godbold, Perrin [University of Virginia, Charlottesville, VA (United States)]·Chen, Jingguang G. [Columbia University, New York, NY (United States)] (ORCID:0000000295922635)·Goddard, III, William A. [California Institute of Technology, Pasadena, CA (United States)] (ORCID:0000000300975716)·Zhang, Sen [University of Virginia, Charlottesville, VA (United States)] (ORCID:0000000217163741)
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Abstract

Pt-based electrocatalysts are effective for the hydrogen evolution reaction (HER); however, their limited ability to facilitate water dissociation and suboptimal hydrogen binding energy (H BE ) in alkaline electrolytes result in slow reaction kinetics, which hinders their cost-efficiency and practical applications. This study reports the synthesis of Co 2 P-Pt heterostructure nanorods using a seed-mediated growth method, producing a high density of Co 2 P-Pt interfacial sites. Density functional theory (DFT) calculations indicate that electronic interactions at these interfaces optimize H BE on Pt, while the interfacial sites promote water dissociation. The Co 2 P-Pt nanorods demonstrate an overpotential of 14 mV at 10 mA cm −2 for the HER, highlighting the potential of precisely engineered metal-metal phosphide interfaces for enhancing electrocatalytic efficiency.

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36 MATERIALS SCIENCEalkaline electrolytecatalystselectrolysisevolution reactionsheterostructurehydrogenhydrogen evolution reactioninterfacial sitesnanorodsplatinum

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Musikanth, Daniel P. [University of Virginia, Charlottesville, VA (United States)] (ORCID:0009000046038977), Kwon, Soonho [California Institute of Technology, Pasadena, CA (United States); Pohang University of Science and Technology (POSTECH) (Korea, Republic of)] (ORCID:0000000292253018), Xie, Zhenhua [Columbia University, New York, NY (United States)] (ORCID:0000000337378894), Chen, Yizhen [University of Virginia, Charlottesville, VA (United States)] (ORCID:0000000284992013), Hwang, Sooyeon [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000156066728), Godbold, Perrin [University of Virginia, Charlottesville, VA (United States)], Chen, Jingguang G. [Columbia University, New York, NY (United States)] (ORCID:0000000295922635), Goddard, III, William A. [California Institute of Technology, Pasadena, CA (United States)] (ORCID:0000000300975716), Zhang, Sen [University of Virginia, Charlottesville, VA (United States)] (ORCID:0000000217163741). 2026-04-30. Co 2 P-Pt Heterostructure Interfaces for Electrocatalytic Hydrogen Evolution. https://doi.org/10.1021/acscatal.6c00563

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DOE OSTI2026

Cyclic moisture reactivation of calcium sorbents for long duration thermochemical energy storage

The transition to a flexible and reliable energy infrastructure, using electro-thermal energy generation technologies such as geothermal, concentrated solar power, and nuclear, usually demands simultaneous advancement of thermal energy storage (TES) to support on-demand electricity generation and industrial applications while mitigating the inherent intermittency of renewable energy sources and power outages from direct energy generation. Among TES technologies, thermochemical energy storage (TCES) based on calcium looping emerges as a compelling high-power energy storage candidate due to its high reaction enthalpy, compatibility with elevated operating temperatures, and abundance of low-cost materials. However, the long-term durability of calcium-based sorbents for TCES is hindered by surface sintering and particle aggregation, leading to performance degradation over repeated thermal cycles. This study explores a moisture hydration-based strategy to regenerate a degraded calcium sorbent and mitigate performance degradation for long duration TCES. The addition of moisture transforms calcium oxide into calcium hydroxide and produces intercalation water layers, associated with a regenerated surface area and reduced calcium oxide crystallite size. Both these effects are beneficial in restoring the sorbents' reactivity for carbonization. Additionally, an optimized hydration-assisted reactivation protocol balances the recovered energy storage capacity with heating penalty required for moisture removal from hydrated samples, resulting in an enhanced energy storage capacity up to 176% compared to benchmark sorbents that undergo cycling without reactivation after 60 cycles. In conclusion, these results highlight the potential of hydration-assisted reactivation to enhance the long-term performance of TCES, providing an effective pathway to advancing electro-thermal storage technologies.

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