Kai Chen, Yong-Hua Cao, Gyu-Cheol Kim, Chiyeop Kim, Sunny Yadav, Vandung Dao, In-Hwan Lee
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引用次数: 0
摘要
在高效清洁能源领域,构建用于氧进化反应(OER)和氢进化反应(HER)的高活性双功能电极仍面临重大挑战。本文采用表面/界面重构策略,在泡沫镍上构建了两种高性能双功能电极,它们分别具有刷状和线状钴/磷化镍异质结构纳米阵列,分别称为 b-CoP/Ni2P/NF 和 w-CoP/Ni2P/NF。独特的形态构造和丰富的异质结构界面有效地加速了电子和质子的转化,暴露出超高的活性位点和载流子迁移率。因此,b-CoP/Ni2P/NF 具有更强的质子/电子去除/插入能力和更高的电导率,在 OER/HER 过程中表现出显著的电催化活性和动力学特性。此外,密度泛函理论计算表明,设计构建高指数表面异质结可显著优化 HER 中的氢吸附能,并降低 OER 中的中间(O* → OOH*)转换势垒。在实际应用中,b-CoP/Ni2P/NF 在碱性双电极全电池分水系统中实现了极低的过电位和出色的稳定性。
Synergism of electronic modulation and geometric architecture: bimetallic phosphide heterostructure on nickel foam for efficient water splitting
In the field of efficient and clean energy, significant challenges remain in constructing highly active bifunctional electrodes for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, two high-performance bifunctional electrodes with brush-like and wire-like cobalt/nickel phosphide heterostructure nanoarrays supported on nickel foam are constructed using a surface/interface reconstruction strategy, termed b-CoP/Ni2P/NF, and w-CoP/Ni2P/NF, respectively. The unique morphological configuration and rich heterostructure interface effectively accelerate the transformation of electrons and protons, exposing ultra-high active sites and carrier mobility. As a result, b-CoP/Ni2P/NF, with its stronger proton/electron removal/insertion ability and higher conductivity, demonstrates remarkable electrocatalytic activity and kinetics in OER/HER processes. Moreover, the density functional theory calculations reveal that designing the construction of high-index surface heterojunctions can significantly optimize hydrogen adsorption energy in HER and reduce the intermediate (O* → OOH*) conversion barrier in OER. In practical applications, the b-CoP/Ni2P/NF achieves a very low overpotential and excellent stability in alkaline double-electrode full-cell water-splitting systems.
期刊介绍:
Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field.
The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest.
Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials.
Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.