Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry , Beijing Normal University , Beijing 100875 , China.
College of Chemical and Environmental Engineering , Shandong University of Science and Technology , Qingdao 266590 , China.
Inorg Chem. 2019 Mar 18;58(6):4014-4018. doi: 10.1021/acs.inorgchem.9b00112. Epub 2019 Mar 7.
The development of novel and highly efficient bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an ongoing challenge. The Cr cation has a special electronic configuration (te), which facilitates charge transfer and electron capture. However, Cr-based materials applied on water-splitting electrocatalysis is still a research void up to now. Herein, a novel amorphous γ-CrOOH was developed as a bifunctional electrocatalyst toward overall water splitting for the first time. It shows extraordinary HER activity with an ultralow overpotential of only 149 mV at 50 mA cm. Meantime, there is a small overpotential of 334 mV at 50 mA cm for the OER. Importantly, the bifunctional electrocatalyst for overall water-splitting electrocatalysis can work with a cell voltage of merely 1.56 V at 10 mA cm. Amorphous γ-CrOOH has effectively enhanced the intrinsic electrochemical activity via density functional theoretical calculations. Therefore, this work not only provides a new method for preparation of amorphous γ-CrOOH but also expands the types of catalysts for water splitting.
开发新型高效的氢析出反应 (HER) 和氧析出反应 (OER) 双功能电催化剂是一个持续的挑战。Cr 阳离子具有特殊的电子构型 (te)，这有利于电荷转移和电子捕获。然而，迄今为止，Cr 基材料在水分解电催化中的应用仍然是一个研究空白。在此，首次开发了一种新型非晶态 γ-CrOOH 作为全水分解的双功能电催化剂。它表现出非凡的 HER 活性，在 50 mA cm 时的超小过电位仅为 149 mV。同时，在 50 mA cm 时，OER 的过电位仅为 334 mV。重要的是，整体水分解电催化的双功能电催化剂仅需 1.56 V 的电池电压即可在 10 mA cm 下工作。非晶态 γ-CrOOH 通过密度泛函理论计算有效地提高了其本征电化学活性。因此，这项工作不仅为制备非晶态 γ-CrOOH 提供了一种新方法，而且还扩展了水分解催化剂的类型。
