Cobalt phosphide nanoarrays with crystalline-amorphous hybrid phase for hydrogen production in universal-pH
Cobalt phosphide nanoarrays with crystalline-amorphous hybrid phase for hydrogen production in universal-pH
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DOI：
10.1007/s12274-020-2881-y
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发表时间：
2020-06
期刊：
影响因子：
9.9
通讯作者：
H. Yoon;Hee Jo Song;Bobae Ju;Dong‐Wan Kim
中科院分区：
文献类型：
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作者：
H. Yoon;Hee Jo Song;Bobae Ju;Dong‐Wan Kim
为了实现电化学水分解制氢的大规模生产，有必要开发出在通用pH范围内性能与Pt相当的强大、高活性、稳定、经济的析氢反应（HER）电催化剂。在这项工作中，碳毡负载的磷化钴杂化纳米片（CoP HNS/CF）在通用ph下表现出优越的电催化制氢性能。在这些纳米片中，单个CoP HNS由多晶CoP和富氧无定形Co-O-P相组成。得益于其独特的纳米结构，制备的CoP HNS/CF表现出巨大的电催化HER活性，在通用ph下优于Pt/C和最先进的CoP电催化剂。在酸性和中性介质中，CoP HNS/CF表现出优异的电催化活性，同时保持了其原有的晶非晶杂化相和形态。在碱性介质中，CoP HNS/CF出人意料的相和形态重组导致了出色的电催化性能。CoP HNS/CF不仅具有较高的电催化活性和动力学，而且在500 mA·cm−2的高电流密度下也具有稳定和较长的工作寿命。此外，CoP - HNS/CF的制备易于规模化，且大CoP - HNS/CF电极也具有相似的电催化活性和稳定性。
To accomplish mass hydrogen production by electrochemical water-splitting, it is a necessary to develop robust, highly active, stable, and cost-effective hydrogen evolution reaction (HER) electrocatalysts that perform comparably to Pt in the universal pH range. In this work, cobalt phosphide hybrid nanosheets supported on carbon felt (CoP HNS/CF) are presented, which exhibit the superior electrocatalytic hydrogen production under a universal-pH. In these nanosheets, a single CoP HNS is composed of polycrystalline CoP and oxygen-enriched amorphous Co-O-P phase. Benefiting from its unique nanoarchitecture, as-fabricated CoP HNS/CF exhibits a tremendous electrocatalytic HER activity and outperforms Pt/C as well as state-of-the-art CoP electrocatalysts in universal-pH. In acidic and neutral media, the CoP HNS/CF shows superior electrocatalytic activity while maintaining its original hybrid crystalline-amorphous phase and morphology. In alkaline medium, the unexpected phase and morphological reorganization of CoP HNS/CF results in outstanding electrocatalytic operation. CoP HNS/CF not only achieves high electrocatalytic activity and kinetics, but also a stable and long operating lifetime even under a high current density of 500 mA·cm−2. Furthermore, the fabrication of CoP HNS/CF can be scaled up easily, and the large CoP HNS/CF electrode also exhibits similar electrocatalytic activity and stability.