Li Yutong, Yi Jianhui, Qin Ruige, Xie Chenxu, Zhao Lijun, Lang Xingyou, Jiang Qing
Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
J Colloid Interface Sci. 2024 May;661:690-699. doi: 10.1016/j.jcis.2024.01.098. Epub 2024 Jan 24.
The discovery of earth-abundant electrocatalysts to replace platinum and iridium for overall water splitting is a crucial step in reducing the cost of green hydrogen production. Transition metal phosphides have drawn wide attention due to their non-toxicity, good chemical stability, low cost, and stable catalytic activity in alkaline electrolytes. We report a three-dimensional flower-like structure composed of core-shell nanoneedles as catalysts, in which CeO is introduced on the surface of nickel cobalt bimetallic phosphide through electrodeposition. And X-ray photoelectron spectroscopy testing and DFT calculations show electron coupling and transfer between CeO and CoP, thereby modulating the electronic structure of the catalyst surface and reducing the adsorption energy of H atoms during the catalytic process, resulting in enhanced catalytic activity. In 1 M KOH, it exhibits a low overpotential of 109 and 296 mV to achieve the current density of 50 mA cm for HER and OER, respectively. When used as both cathode and anode as a bifunctional catalyst, a voltage of only 1.77 V is required to achieve a current density of 50 mA cm, demonstrating great industrial potential.
发现储量丰富的地球元素电催化剂以替代铂和铱用于全水解，是降低绿色制氢成本的关键一步。过渡金属磷化物因其无毒、良好的化学稳定性、低成本以及在碱性电解质中稳定的催化活性而备受关注。我们报道了一种由核壳纳米针组成的三维花状结构作为催化剂，其中通过电沉积将CeO引入到镍钴双金属磷化物表面。X射线光电子能谱测试和密度泛函理论计算表明CeO与CoP之间存在电子耦合和转移，从而调节了催化剂表面的电子结构并降低了催化过程中H原子的吸附能，导致催化活性增强。在1 M KOH中，实现HER和OER的50 mA cm电流密度时，其过电位分别低至109和296 mV。当用作双功能催化剂的阴极和阳极时，仅需1.77 V的电压即可实现50 mA cm的电流密度，显示出巨大的工业潜力。
