Hierarchical Ni/Ni(OH)2-NiCo2O4 Supported on Ni Foam as Efficient Bifunctional Electrocatalysts for Water Splitting,The Journal of Physical Chemistry C

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Hierarchical Ni/Ni(OH)2-NiCo2O4 Supported on Ni Foam as Efficient Bifunctional Electrocatalysts for Water Splitting
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-03-18 , DOI: 10.1021/acs.jpcc.1c07688
Yanjun Yu ₁ , Chen Chen ₁ , Yiheng Liu ₁ , Hongliang Yu ₁ , Shuaijie Li ₁ , Yanan Xue ₁ , Ning Cai ₁ , Jianzhi Wang ₁ , Faquan Yu ₁

Affiliation

Developing efficient and cost-effective bifunctional catalytic electrodes is of great importance to water splitting. In this study, hybrid Ni/Ni(OH)₂-coated NiCo₂O₄ nanorods were grown on Ni foam (NF) by a facile growth–conversion–epitaxy approach. The epitaxial decoration of Ni/Ni(OH)₂ composite could increase the intrinsic activity of NiCo₂O₄/NF and enhance the charge-transfer rate. This self-standing hierarchical nanohybrid with unique surface chemistry and interface engineering exhibits an excellent electrocatalytic performance. The optimized Ni/Ni(OH)₂-NiCo₂O₄/NF only requires overpotentials of 53 and 235 mV to reach a current density of 10 mA cm^–2 for HER and OER, respectively. The electrolyzer achieved 10 mA cm^–2 at a low cell voltage of 1.51 V for water splitting. This work offers a new perspective for rationally designing electrocatalytic materials by surface decoration.

中文翻译：

Ni泡沫负载的分级Ni/Ni(OH)2-NiCo2O4作为高效双功能水分解电催化剂

开发高效且具有成本效益的双功能催化电极对水分解非常重要。在这项研究中，混合 Ni/Ni(OH) ₂涂层的 NiCo ₂ O ₄纳米棒通过简便的生长-转化-外延方法在泡沫镍 (NF) 上生长。Ni/Ni(OH) ₂复合材料的外延修饰可以提高NiCo ₂ O ₄ /NF的本征活性，提高电荷转移率。这种具有独特表面化学和界面工程的自立分层纳米杂化物表现出优异的电催化性能。优化的Ni/Ni(OH) ₂ -NiCo ₂ O ₄/NF 仅需要 53 和 235 mV 的过电势即可分别达到 10 mA cm ^–2的 HER 和 OER 电流密度。电解槽在 1.51 V 的低电池电压下实现了 10 mA cm ^–2的水分解。该工作为通过表面修饰合理设计电催化材料提供了新的视角。

更新日期：2022-03-18

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