Atomically thin photoanode of InSe/graphene heterostructure.
Atomically thin photoanode of InSe/graphene heterostructure.
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InSe/石墨烯异质结构的原子薄光电阳极
DOI：
10.1038/s41467-020-20341-7
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发表时间：
2021-01-04
影响因子：
16.6
通讯作者：
Cao Y
中科院分区：
文献类型：
--
作者：
Zheng H;Lu Y;Ye KH;Hu J;Liu S;Yan J;Ye Y;Guo Y;Lin Z;Cheng J;Cao Y
实现高效光电化学水分解需要更好地理解离子动力学，例如，扩散、吸附和反应。然而，与宏观三维电极，它往往是很难解开的总光电流的表面效应的贡献，从各种因素在体。在这里，我们报告了由InSe晶体单层制成的光阳极，该单层用单层石墨烯封装以确保高稳定性。在众多的二维光响应材料中，我们选择了具有高迁移率和强抑制电子-空穴对复合特性的InSe材料。使用原子级薄电极，我们在1.23 V下获得了密度>10 mA cm−2的光电流，相对于可逆氢电极，这比其他2D光电极大几个数量级。除了InSe的突出特性之外，我们将增强的光电流归因于阳极表面附近的氢氧根离子和光生空穴之间的强耦合。其结果是，即使在照明停止后的持续电流也被观察到，由于存在离子捕获的空穴与抑制的电子-空穴复合。我们的研究结果提供了原子级薄的材料作为研究离子动力学在电极表面的平台，并阐明了开发下一代光电极的高效率。实现高效的光电化学电池需要深入了解光电极表面的离子动力学。在这里，作者展示了一个新的平台，通过使用单层InSe作为阳极，具有高的光电流密度，研究氢氧根离子和表面电荷载流子之间的强耦合。
Achieving high-efficiency photoelectrochemical water splitting requires a better understanding of ion kinetics, e.g., diffusion, adsorption and reactions, near the photoelectrode’s surface. However, with macroscopic three-dimensional electrodes, it is often difficult to disentangle the contributions of surface effects to the total photocurrent from that of various factors in the bulk. Here, we report a photoanode made from a InSe crystal monolayer that is encapsulated with monolayer graphene to ensure high stability. We choose InSe among other photoresponsive two-dimensional (2D) materials because of its unique properties of high mobility and strongly suppressing electron–hole pair recombination. Using the atomically thin electrodes, we obtained a photocurrent with a density >10 mA cm−2 at 1.23 V versus reversible hydrogen electrode, which is several orders of magnitude greater than other 2D photoelectrodes. In addition to the outstanding characteristics of InSe, we attribute the enhanced photocurrent to the strong coupling between the hydroxide ions and photo-generated holes near the anode surface. As a result, a persistent current even after illumination ceased was also observed due to the presence of ions trapped holes with suppressed electron-hole recombination. Our results provide atomically thin materials as a platform for investigating ion kinetics at the electrode surface and shed light on developing next-generation photoelectrodes with high efficiency. Achieving efficient photoelectrochemical cells requires insights into the ion kinetics at the surface of photoelectrode. Here, the authors show a new platform for investigating strong coupling between hydroxide ions and surface charge carriers by using monolayer InSe as the anode with high photocurrent density.
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光电催化水分解：助催化剂、电解质和界面的意义
影响因子：
12.9
作者：
Ding, Chunmei;Shi, Jingying;Li, Can
通讯作者：
Li, Can
DOI：
10.1021/acs.jpclett.6b02248
发表时间：
2016-11-17
期刊：
The journal of physical chemistry letters
影响因子：
--
作者：
Grosjean B;Pean C;Siria A;Bocquet L;Vuilleumier R;Bocquet ML
通讯作者：
Bocquet ML
影响因子：
2.1
作者：
Bolotin, K. I.;Sikes, K. J.;Stormer, H. L.
通讯作者：
Stormer, H. L.
影响因子：
64.8
作者：
Feng, Jiandong;Graf, Michael;Radenovic, Aleksandra
通讯作者：
Radenovic, Aleksandra
影响因子：
41.2
作者：
Bakkers, EPAM;Van Dam, JA;Van der Sluis, P
通讯作者：
Van der Sluis, P