Yolk-shell structured microsphere consisting of CoO/CoP hetero-interfaced nanocomposite as highly active hydrogen evolution reaction electrocatalysts for AEM electrolyzer stacks

IF 10.7 2区材料科学 Q1 CHEMISTRY, PHYSICAL Journal of Materials Chemistry A Pub Date : 2025-03-01 DOI:10.1039/d4ta07211a

In Tae Kim, Tae Ha Kim, Seong Jun Moon, Gi Dae Park, Yoo Sei Park

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Abstract

Anion exchange membrane water electrolyzer (AEM electrolyzer) is an advanced technology for converting electrical energy into hydrogen energy with high efficiency and low cost. However, its advantages are diminished by significant voltage losses due to insufficient catalytic activity. To address this issue, yolk-shell structured microsphere consisting of CoO/CoP hetero-interfaced nanocomposite (YS-CoO/CoP) has been developed as highly active hydrogen evolution reaction (HER) electrocatalysts, which exhibited and overepotential -126 mV at -10 mA cm-2 and was applied in an AEM electrolyzer. The yolk-shell structure improves ion and gas transport, reducing mass transport losses, while enhancing HER activity results from electron redistribution at the CoO/CoP interface. The AEM electrolyzer equipped with YS-CoO/CoP for HER and NiFe-LDH for OER shows reduced activation and mass transport losses, achieving a high current density of 0.6 A cm-2 at 1.8 Vcell. Additionally, a 3-cell AEM electrolyzer stack equipped with non-platinum group metal (non-PGM) electrocatalysts for both OER and HER demonstrates high performance.

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阴离子交换膜水电解槽（AEM 电解槽）是一种高效、低成本地将电能转化为氢能的先进技术。然而，由于催化活性不足导致电压损失严重，其优势大打折扣。为解决这一问题，人们开发了由 CoO/CoP 异质界面纳米复合材料（YS-CoO/CoP）组成的卵黄壳结构微球，作为高活性氢进化反应（HER）电催化剂。卵壳结构改善了离子和气体的传输，减少了质量传输损失，同时由于 CoO/CoP 界面的电子再分布，提高了 HER 活性。配备 YS-CoO/CoP 的 AEM 电解槽用于 HER，配备 NiFe-LDH 的 AEM 电解槽用于 OER，其活化和质量传输损耗均有所降低，在 1.8 Vcell 时可达到 0.6 A cm-2 的高电流密度。此外，配备非铂族金属（non-platinum group metal，non-PGM）电催化剂用于 OER 和 HER 的 3 芯 AEM 电解槽堆也表现出很高的性能。

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来源期刊

Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

19.50

自引率

5.00%

发文量

1892

审稿时长

1.5 months

期刊介绍： The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.