Yan Liang, Song Dan, Liang Jiayu, Li Xinyi, Li Hao, Liu Quanbing
School of Chemistry and Materials Engineering, Huizhou University, Huizhou 516007, China.
School of Chemistry and Materials Engineering, Huizhou University, Huizhou 516007, China.
J Colloid Interface Sci. 2023 Jun 15;640:338-347. doi: 10.1016/j.jcis.2023.02.113. Epub 2023 Feb 28.
The development of nonprecious metal catalysts for producing hydrogen from economical alkaline water electrolysis that is both stable and efficient is crucial but remains challenging. In this study, Rh-doped cobalt-nickel-layered double hydroxide (CoNi LDH) nanosheet arrays with abundant oxygen vacancies (Ov) in-situ grown on TiCT MXene nanosheets (Rh-CoNi LDH/MXene) were successfully fabricated. The synthesized Rh-CoNi LDH/MXene exhibited excellent long-term stability and a low overpotential of 74.6 ± 0.4 mV at -10 mA cm for hydrogen evolution reaction (HER) owing to its optimized electronic structure. Experimental results and density functional theory calculations revealed that the incorporation of Rh dopant and Ov into CoNi LDH and the coupling interface between Rh-CoNi LDH and MXene optimized the hydrogen adsorption energy, which accelerated the hydrogen evolution kinetics, thereby accelerating the overall alkaline HER process. This work presents a promising strategy for designing and synthesizing highly efficient electrocatalysts for electrochemical energy conversion devices.
开发用于经济的碱性水电解制氢的非贵金属催化剂，使其既稳定又高效，这一点至关重要，但仍然具有挑战性。在本研究中，成功制备了在TiCT MXene纳米片上原位生长的具有丰富氧空位（Ov）的Rh掺杂钴镍层状双氢氧化物（CoNi LDH）纳米片阵列（Rh-CoNi LDH/MXene）。合成的Rh-CoNi LDH/MXene由于其优化的电子结构，在析氢反应（HER）中表现出优异的长期稳定性，在-10 mA cm时的过电位低至74.6 ± 0.4 mV。实验结果和密度泛函理论计算表明，Rh掺杂剂和Ov掺入CoNi LDH以及Rh-CoNi LDH与MXene之间的耦合界面优化了氢吸附能，加速了析氢动力学，从而加速了整个碱性HER过程。这项工作为设计和合成用于电化学能量转换装置的高效电催化剂提供了一种有前景的策略。
