Ultradense carbon-encapsulated Co2P chainmail catalyst embedded within hierarchically porous monolithic carbon matrix for superior alkaline electrocatalytic water splitting

Shixiong Min, Yaoyao Zhao, Zhe Meng, Fang Wang, Wenjing Li and Zhengguo Zhang

Renewable Energy, 2024, vol. 236, issue C

Abstract: While carbon-encapsulated transition metal-based chainmail electrocatalysts in powdery forms have shown impressive electrocatalytic activity toward water splitting, their performance is often restricted by the insufficient catalytic active sites and stability. Herein, a monolithic carbon-based bifunctional electrocatalyst is fabricated by embedding ultradense N, P-codoped carbon-encapsulated Co2P nanoparticles (<50 nm) within hierarchically porous carbonized Pleurotus eryngii (Co2P@NPC/CPE). The integrated porous structure of Co2P@NPC/CPE electrode contributes to fast multiphase mass diffusion and electron transfer. Moreover, the ultradense Co2P@NPC chainmail catalyst offers abundant active sites and strong interfacial coupling with CPE matrix thus ensuring excellent structural stability. These merits endow the Co2P@NPC/CPE with low overpotentials of 173 and 349 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at 100 mA cm−2 in 1.0 M KOH, respectively, and it retains 77 % and 74 % of the HER and OER activities after 100 and 10 h, respectively. Notably, a two-electrode electrolyzer assembled with Co2P@NPC/CPE requires lower cell voltages of 1.66 and 1.92 V at 10 and 100 mA cm−2, respectively, while demonstrating 76 % retention of its initial activity after 12 h at 100 mA cm−2 and providing a high solar-to-H2 conversion efficiency of 18 % under AM 1.5G irradiation from a Si solar cell.

Keywords: Chainmail catalyst; Co2P nanoparticles; Porous carbon matrix; Monolithic electrode; Water splitting; H2 production (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:236:y:2024:i:c:s0960148124014514

DOI: 10.1016/j.renene.2024.121383

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