CeO2 加速的 CoSe2 纳米针表面重构形成活性 CeO2@CoOOH 界面，促进水分离中的氧进化反应

IF 8.2 1区化学 Q1 CHEMISTRY, ANALYTICAL

ACS Sensors Pub Date : 2024-11-11 DOI:10.1002/aenm.202403744

Quanxin Guo, Yu Li, Zhengrong Xu, Rui Liu

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引用次数: 0

摘要

界面工程是制造高性能水分离电催化剂的有效策略。在本研究中，碳布上的 CeO2@CoSe2 纳米针（CeO2@CoSe2/CC）在氧进化反应（OER）和水分离方面表现出很高的效率。具有大量 O 空位的 CeO2 可促进 OH- 的吸附，并在较低电位下促进 CoSe2 重构为 CoOOH。原位生成的活性 CeO2@CoOOH 异质界面上移了 Co 位点的 d 带中心，从而降低了 OER 过程中速率决定步骤（RDS）（*O 到 *OOH）的自由能。在 10 mA cm-2 的条件下，它能提供 245 mV 的低 OER 过电位。研究还发现，CeO2@CoSe2/CC 在氢进化反应（HER，10 mA cm-2 时 138 mV 的过电位）中也很活跃，这得益于 CeO2 促进的 *H2O 解离和 *H 在 CoSe2 上的吸附。在 CeO2@CoSe2/CC 双功能电极上实现了整体水分离，10 mA cm-2 时电解电压低至 1.54 V。这项工作为 CeO2 辅助表面重构提供了宝贵的见解，并通过界面工程提供了水电解催化剂。

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CeO2‐Accelerated Surface Reconstruction of CoSe2 Nanoneedle Forms Active CeO2@CoOOH Interface to Boost Oxygen Evolution Reaction for Water Splitting

Interface engineering is an efficient strategy to create high‐performance electrocatalysts for water splitting. In the present work, CeO2@CoSe2 nanoneedle on carbon cloth (CeO2@CoSe2/CC) demonstrates high efficiency for oxygen evolution reaction (OER) and water splitting. CeO2 with abundant O vacancies facilitates the adsorption of OH− and boosts the reconstruction of CoSe2 into CoOOH at lower potentials. The in situ generated active CeO2@CoOOH heterointerface upshifts the d‐band center of Co site, thereby decreasing the free energy of rate‐determining step (RDS) (*O to *OOH) during the OER process. It delivers a low OER overpotential of 245 mV at 10 mA cm−2. CeO2@CoSe2/CC is also found to be active for hydrogen evolution reaction (HER, 138 mV overpotential at 10 mA cm−2), profiting from CeO2‐facilitated *H2O dissociation and *H adsorption on CoSe2. The overall water splitting is achieved over the CeO2@CoSe2/CC bifunctional electrode with a low electrolysis voltage of 1.54 V at 10 mA cm−2. This work offers valuable insights into CeO2‐assisted surface reconstruction as well as provides water electrolysis catalysts through interface engineering.

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来源期刊

ACS Sensors Chemical Engineering-Bioengineering

CiteScore

14.50

自引率

3.40%

发文量

372

期刊介绍： ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.