{"title":"Component regulation in flower-like FexCoNiP/C nanohybrids as bifunctional efficient electrocatalysts for overall water splitting","authors":"","doi":"10.1016/j.electacta.2024.144751","DOIUrl":null,"url":null,"abstract":"<div><p>Incorporating bi-metal transition metal phosphides (TMPs) with high-valent metal is a powerful method to obtain highly efficient and low-cost bifunctional electrocatalysts in alkaline media for overall water splitting. However, the composition-activity relationship of such incorporation has not been investigated yet due to the challenge in constructing tri-metal TMPs with continuously variable composition while maintaining a homogenous elemental distribution. In this study, we proposed a strategy using a trimetal oleta composite with a homogenous elemental distribution at the molecular scale as an ideal precursor. This precursor was then used to fabricate Fe-incorporated Ni-Co phosphide on a flower-like carbon substrate, resulting in a continuously changeable Fe content (Fe<sub>x</sub>NiCoP/C). Benefiting from the fully exposed structure and the incorporation of Fe, the flower-like Fe<sub>x</sub>NiCoP/C hybrids exhibited excellent electrocatalytic performance for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). By optimizing the Fe content, the flower-like Fe<sub>0.4</sub>NiCoP/C hybrid achieved 10 mA/cm<sup>2</sup> at a low overpotential of 243 mV for the OER and 107 mV for the HER, respectively. When the optimal Fe<sub>0.4</sub>NiCoP/C electrodes were employed as the anode and cathode for water electrolysis in an alkaline electrolyte, the electrolyzer achieved 10 mA/cm<sup>2</sup> at a low cell voltage of 1.59 V. This work provides an inexpensive, highly active, and durable electrocatalyst, while revealing the composition-activity relationship of Fe<sub>x</sub>NiCoP/C for overall water splitting in alkaline media.</p></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":null,"pages":null},"PeriodicalIF":5.5000,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochimica Acta","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013468624009915","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
引用次数: 0
Abstract
Incorporating bi-metal transition metal phosphides (TMPs) with high-valent metal is a powerful method to obtain highly efficient and low-cost bifunctional electrocatalysts in alkaline media for overall water splitting. However, the composition-activity relationship of such incorporation has not been investigated yet due to the challenge in constructing tri-metal TMPs with continuously variable composition while maintaining a homogenous elemental distribution. In this study, we proposed a strategy using a trimetal oleta composite with a homogenous elemental distribution at the molecular scale as an ideal precursor. This precursor was then used to fabricate Fe-incorporated Ni-Co phosphide on a flower-like carbon substrate, resulting in a continuously changeable Fe content (FexNiCoP/C). Benefiting from the fully exposed structure and the incorporation of Fe, the flower-like FexNiCoP/C hybrids exhibited excellent electrocatalytic performance for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). By optimizing the Fe content, the flower-like Fe0.4NiCoP/C hybrid achieved 10 mA/cm2 at a low overpotential of 243 mV for the OER and 107 mV for the HER, respectively. When the optimal Fe0.4NiCoP/C electrodes were employed as the anode and cathode for water electrolysis in an alkaline electrolyte, the electrolyzer achieved 10 mA/cm2 at a low cell voltage of 1.59 V. This work provides an inexpensive, highly active, and durable electrocatalyst, while revealing the composition-activity relationship of FexNiCoP/C for overall water splitting in alkaline media.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.