Addressing the OER/HER imbalance by a redox transition-induced two-way electron injection in a bifunctional n–p–n electrode for excellent water splitting,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Addressing the OER/HER imbalance by a redox transition-induced two-way electron injection in a bifunctional n–p–n electrode for excellent water splitting
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-25 , DOI: 10.1039/d0ta03392h
Hassan Anwer _{1,

2,

3,

4} , Jae-Woo Park _{1,

2,

3,

4}

Affiliation

Here, an n–p–n electrode is proposed to preserve the oxygen evolution reaction (OER)/hydrogen evolution reaction (HER) balance without compromising the overall water splitting performance. Electrode activation is synchronized with a photosensitive p-region (WSe₂) that forward biases itself with respect to the electrolyte reduction potential. Following activation, electron injection by NiFe₂O₄ nanodots forms the basis of excellent OER and HER at the catalyst–electrolyte interface. The electron injection potential of NiFe₂O₄ was confirmed from its ability to function like an organic sensitizer in a solar cell. The photoresponse time and photosensitivity characteristics showed that the catalyst has an n–p–n structure similar to that of a virtual phototransistor. The synergy between electron injection and two-way electron transfer yielded overpotentials of 43 and 92 mV for the HER and OER in alkaline medium, respectively. First principle calculations supported this excellent performance by correlating it to adsorption/desorption binding energy. The results from this research offer a new strategy to design noble metal-free catalyst systems for large-scale solar to fuel generation applications.

中文翻译：

通过在双功能n–p–n电极中通过氧化还原跃迁引起的双向电子注入来解决OER / HER不平衡问题，以实现出色的水分解

在这里，提出了一种n–p–n电极，以在不影响整体水分解性能的情况下保持氧释放反应（OER）/氢释放反应（HER）的平衡。电极激活与感光性p区域（WSe ₂）同步，该感光性p区域相对于电解液还原电势向前偏置。活化后，NiFe ₂ O ₄纳米点的电子注入在催化剂-电解质界面形成了优异的OER和HER的基础。NiFe ₂ O ₄的电子注入电势证实其具有像太阳能电池中的有机敏化剂一样的功能。光响应时间和光敏特性表明，该催化剂具有类似于虚拟光电晶体管的n–p–n结构。电子注入和双向电子转移之间的协同作用使碱性介质中的HER和OER分别产生43和92 mV的超电势。第一原理计算通过将其与吸附/解吸结合能相关联来支持这种出色的性能。这项研究的结果为设计用于大规模太阳能到燃料发电应用的无贵金属催化剂系统提供了一种新策略。

更新日期：2020-07-07

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11