Electronic modulation towards MOFs as template derived CoP via engineered heteroatom defect for a highly efficient overall water splitting

IF 13.1 1区 化学 Q1 Energy Journal of Energy Chemistry Pub Date : 2024-10-22 DOI:10.1016/j.jechem.2024.10.010
Meijie Ding , Zhiqiang Wei , Dexue Liu , Wenhua Zhao , Qiang Lu , Zhiming Li , Qingsong Yu , Chenggong Lu , Hua Yang
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Abstract

The reasonable design of material morphology and eco-friendly electrocatalysts are essential to highly efficient water splitting. It is proposed that a promising strategy effectively regulates the electronic structure of the d‐orbitals of CoP using cerium doping in this paper, thus significantly improving the intrinsic property and conductivity of CoP for water splitting. As a result, the as-synthesize porous Ce-doped CoP micro-polyhedron composite derived from Ce-ZIF-67 as bifunctional electrocatalytic materials exhibits excellent electrocatalytic performance in both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), overpotentials of about 152 mV for HER at 10 mA cm−2 and about 352 mV for OER at 50 mA cm−2, and especially it shows outstanding long-term stability. Besides, an alkaline electrolyzer, using Ce0.04Co0.96P electrocatalyst as both the anode and cathode, delivers a cell voltage value of 1.55 V at the current density of 10 mA cm−2. The calculation results of the density functional theory (DFT) demonstrate that the introduction of an appropriate amount of Ce into CoP can enhance the conductivity, and can induce the electronic modulation to regulate the selective adsorption of reaction intermediates on catalytic surface and the formation of O* intermediates (CoOOH), which exhibits an excellent electrocatalytic performance. This study provides novel insights into the design of an extraordinary performance water-splitting of the multicomponent electrocatalysts.

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通过设计杂原子缺陷对作为模板衍生 CoP 的 MOFs 进行电子调制,实现高效整体水分离
合理的材料形态设计和环保型电催化剂是高效水分离的关键。本文提出了一种可行的策略,即利用铈掺杂有效调节 CoP 的 d 轨道电子结构,从而显著改善 CoP 的本征性能和电导率,以实现水的分离。因此,以 Ce-ZIF-67 为原料合成的多孔掺铈 CoP 微多面体复合材料作为双功能电催化材料,在氧进化反应(OER)和氢进化反应(HER)中均表现出优异的电催化性能,在 10 mA cm-2 的条件下,HER 的过电位约为 152 mV,在 50 mA cm-2 的条件下,OER 的过电位约为 352 mV,尤其是它表现出突出的长期稳定性。此外,使用 Ce0.04Co0.96P 电催化剂作为阳极和阴极的碱性电解槽在 10 mA cm-2 的电流密度下可产生 1.55 V 的电池电压值。密度泛函理论(DFT)的计算结果表明,在 CoP 中引入适量的 Ce 可以提高电导率,并能诱导电子调制调节反应中间产物在催化表面的选择性吸附和 O* 中间产物(CoOOH)的形成,从而表现出优异的电催化性能。这项研究为设计性能优异的多组分电催化剂分水器提供了新的见解。
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来源期刊
Journal of Energy Chemistry
Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL
CiteScore
19.10
自引率
8.40%
发文量
3631
审稿时长
15 days
期刊介绍: The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy
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