Dual-laser pulse-patterned α-Co(OH)2/rGO heterointerface for accelerated water oxidation and surface phase-transition via in-situ Raman spectroscopy

IF 10.7 Q1 CHEMISTRY, PHYSICAL
EcoMat Pub Date : 2023-09-26 DOI:10.1002/eom2.12417
Yeryeong Lee, Jayaraman Theerthagiri, Ahreum Min, Cheol Joo Moon, Myong Yong Choi
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引用次数: 0

Abstract

The dynamic surface reconstruction of electrodes is a legible sign to understand the deep phase-transition mechanistic and electrocatalytic origin during the oxygen evolution reaction (OER). Herein, we report a dual-laser pulse-patterned heterointerface of α-Co(OH)2 and reduced graphene oxide (rGO) nanosheets via pulsed laser irradiation in liquid (PLIL) to accelerate OER kinetics. α-Co(OH)2 was formed from the OH ions generated during the PLIL of GO at neutral pH. Co2+ modulation in tetrahedral coordination sites benefits as an electrophilic surface for water oxidation. Few d-vacancies in Co2+ increase its affinity toward oxygen, lowering the energy barrier and generating many CoOOH and CoO2 active sites. rGO with an ordered π-conjugated system aids the surface adsorption of OOH*, O*, and OH* during OER. α-Co(OH)2 surface phase-transition and OER mechanistic steps occurred via phase-reconstruction to CoOOH and CoO2 reactive intermediates, uncovered using in situ electrochemical–Raman spectroscopy. Our findings in the dual-laser pulse strategy and the surface reconstruction correlation in active OER catalysts pave the path for paramount in multiple energy technologies.

Abstract Image

Abstract Image

通过原位拉曼光谱分析双激光脉冲图案化α-Co(OH)2/rGO 异质表面,加速水氧化和表面相变
电极表面的动态重构是了解氧进化反应(OER)过程中的深层相变机理和电催化起源的可靠标志。在此,我们报告了通过液态脉冲激光照射(PLIL)在α-Co(OH)2和还原型氧化石墨烯(rGO)纳米片之间形成的双激光脉冲图案异质表面,以加速氧进化反应动力学。四面体配位位点中的 Co2+ 调节是水氧化的亲电表面。具有有序π-共轭体系的 rGO 在 OER 过程中有助于表面吸附 OOH*、O* 和 OH*。α-Co(OH)2表面的相变和OER机理步骤是通过相重构为CoOOH和CoO2反应中间产物而实现的,这些都是利用原位电化学-拉曼光谱揭示的。我们在双激光脉冲策略和活性 OER 催化剂表面重构相关性方面的发现为多种能源技术的发展铺平了道路。
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来源期刊
CiteScore
17.30
自引率
0.00%
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审稿时长
4 weeks
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