Tailoring Cobalt Phosphide HER Electrocatalysts from Cobalt 2-Carboxyethyl(phenyl)phosphinate Precursors

IF 6.2 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2026-09-18 DOI:10.1039/d6qi01333c

Álvaro Vílchez,Rosario M. Pérez Colodrero,David Marrero-López,Inés R. Salcedo,Aurelia Visa,Pascual Olivera Pastor,Aurelio Cabeza Díaz

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Abstract

A series of biphasic cobalt phosphide-based HER electrocatalysts were obtained by pyrolyzing cobalt 2-carboxyethyl(phenyl)phosphinate precursors in 5% H2–Ar. Among them, CoL2@750, composed of o-CoP (78 wt.%) and o-Co2P (22 wt.%), with an average particle size of ~19 nm, exhibited remarkable hydrogen evolution reaction (HER) activity under acidic, neutral, and alkaline conditions. Supported on carbon fibre paper (CFP), at a loading of 4 mg·cm-2, this catalyst (CoL2@750/CFP-4) achieved overpotentials of 78, 98, and 260 mV at 10 mA·cm-2, respectively, with enhanced kinetics and stability relative to other catalyst preparations. When coupled with a RuO2 anode in an alkaline water-splitting device, a cell voltage of ~1.54 V at 10 mA·cm-2 was obtained and operated stably from ~50 up to at least 100 h. Additional insights into key properties of the assembled CoL2@750/CFP-4 electrode, including particle size distribution and catalyst leaching, were obtained through computed X-ray microtomography (µ-CT) analysis.

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从2-羧基乙基（苯基）膦酸钴前体制备磷化钴HER电催化剂

通过在5% H2-Ar中热解2-羧乙基（苯基）膦酸钴前驱体，制备了一系列双相磷酸钴基HER电催化剂。其中CoL2@750由o-CoP （78 wt.%）和o-Co2P （22 wt.%）组成，平均粒径为~19 nm，在酸性、中性和碱性条件下均表现出显著的析氢反应活性。该催化剂（CoL2@750/CFP-4）负载在碳纤维纸（CFP）上，负载为4 mg·cm-2时，在10 mA·cm-2下的过电位分别为78、98和260 mV，相对于其他催化剂制剂具有更好的动力学和稳定性。当在碱性水分解装置中与RuO2阳极耦合时，获得了~1.54 V （10 mA·cm-2）的电池电压，并在~50至至少100小时内稳定运行。通过计算机x射线微断层扫描（µ-CT）分析，获得了组装的CoL2@750/CFP-4电极的其他关键特性，包括粒度分布和催化剂浸出。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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