Lv Zepeng, Ma Wansen, Dang Jie, Wang Meng, Jian Kailiang, Liu Dong, Huang Dejun
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P.R. China.
Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, P.R. China.
J Phys Chem Lett. 2021 May 27;12(20):4841-4848. doi: 10.1021/acs.jpclett.1c01345. Epub 2021 May 17.
It still is a challenge to create a superior and easily coupled bifunctional electrocatalyst for water splitting impelled by a low voltage. In this work, the controlled growth of CoP NAs on the surface of a MXene (TiCT)-modified self-supporting electrode is demonstrated as a competent and reliable bifunctional electrocatalyst for efficient water splitting. The heterointerface in CoP@TiCT with an optimized adsorption free energy of H*, HO, and better conductivity can give enhanced HER (hydrogen evolution reaction) activity, with a low overpotential (42 mV) at 10 mA cm. Additionally, the OER (oxygen evolution reaction) activity has also been similarly strengthened by the synergy of CoP and MXene with an overpotential of 267 mV to arrive at 10 mA cm. Furthermore, the excellent bifunctional electrode (CoP@TiCT∥CoP@TiCT) exhibits efficient engineering water-splitting performance (1.46 V@10 mA cm) in alkaline solution. This simple design can propose a promising approach to exploit precious-metal-free catalysts for energy conversion.
通过低电压驱动来制备一种性能卓越且易于耦合的用于水分解的双功能电催化剂仍然是一项挑战。在这项工作中，在MXene（TiCT）修饰的自支撑电极表面可控生长的CoP纳米阵列被证明是一种用于高效水分解的合格且可靠的双功能电催化剂。CoP@TiCT中的异质界面具有优化的H*、HO吸附自由能以及更好的导电性，可增强析氢反应（HER）活性，在10 mA cm时过电位低至42 mV。此外，通过CoP和MXene的协同作用，析氧反应（OER）活性也得到了类似增强，过电位为267 mV时达到10 mA cm。此外，这种优异的双功能电极（CoP@TiCT∥CoP@TiCT）在碱性溶液中表现出高效的工程水分解性能（1.46 V@10 mA cm）。这种简单的设计可为开发用于能量转换的无贵金属催化剂提供一种有前景的方法。
