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Homologous CoP/NiCoP Heterostructure on N‐Doped Carbon for Highly Efficient and pH‐Universal Hydrogen Evolution Electrocatalysis
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-12-13 , DOI: 10.1002/adfm.201807976 Ramireddy Boppella 1 , Jeiwan Tan 1 , Wooseok Yang 1 , Jooho Moon 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-12-13 , DOI: 10.1002/adfm.201807976 Ramireddy Boppella 1 , Jeiwan Tan 1 , Wooseok Yang 1 , Jooho Moon 1
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Hydrogen evolution electrocatalysts can achieve sustainable hydrogen production via electrocatalytic water splitting; however, designing highly active and stable noble‐metal‐free hydrogen evolution electrocatalysts that perform as efficiently as Pt catalysts over a wide pH range is a challenging task. Herein, a new 2D cobalt phosphide/nickelcobalt phosphide (CoP/NiCoP) hybrid nanosheet network is proposed, supported on an N‐doped carbon (NC) matrix as a highly efficient and durable pH‐universal hydrogen evolution reaction (HER) electrocatalyst. It is derived from topological transformation of corresponding layer double hydroxides and graphitic carbon nitride. This 2D CoP/NiCoP/NC catalyst exhibits versatile HER electroactivity with very low overpotentials of 75, 60, and 123 mV in 1 m KOH, 0.5 m H2SO4, and 1 m PBS electrolytes, respectively, delivering a current density of 10 mA cm−2 for HER. Such impressive HER performance of the hybrid electrocatalyst is mainly attributed to the collective effects of electronic structure engineering, strong interfacial coupling between CoP and NiCoP in heterojunction, an enlarged surface area/exposed catalytic active sites due to the 2D morphology, and conductive NC support. This method is believed to provide a basis for the development of efficient 2D electrode materials with various electrochemical applications.
中文翻译：
N掺杂碳上的同源CoP / NiCoP异质结构，可实现高效的pH值通用的氢气析出电催化
析氢电催化剂可通过电催化水分解实现可持续的制氢。但是，设计在宽pH范围内具有与Pt催化剂一样高效的高活性和稳定的无贵金属析氢电催化剂是一项艰巨的任务。本文提出了一种新型的二维磷化钴/磷化镍钴（CoP / NiCoP）杂化纳米片网络，并在N掺杂碳（NC）基质上作为一种高效且持久的pH值通用氢析出反应（HER）电催化剂。它源自相应层的双氢氧化物和石墨氮化碳的拓扑转换。这种2D CoP / NiCoP / NC催化剂具有多种HER电活性，在1 m KOH，0.5 m KOH中具有非常低的75、60和123 mV超电势H 2 SO 4和1 m PBS电解质分别为HER提供10 mA cm -2的电流密度。混合电催化剂如此出色的HER性能主要归因于电子结构工程的集体效应，异质结中CoP和NiCoP之间的强界面耦合，由于2D形态导致的表面积增加/暴露的催化活性位以及导电NC支撑。相信该方法为开发具有各种电化学应用的有效二维电极材料提供了基础。
更新日期：2018-12-13
中文翻译：
N掺杂碳上的同源CoP / NiCoP异质结构，可实现高效的pH值通用的氢气析出电催化
析氢电催化剂可通过电催化水分解实现可持续的制氢。但是，设计在宽pH范围内具有与Pt催化剂一样高效的高活性和稳定的无贵金属析氢电催化剂是一项艰巨的任务。本文提出了一种新型的二维磷化钴/磷化镍钴（CoP / NiCoP）杂化纳米片网络，并在N掺杂碳（NC）基质上作为一种高效且持久的pH值通用氢析出反应（HER）电催化剂。它源自相应层的双氢氧化物和石墨氮化碳的拓扑转换。这种2D CoP / NiCoP / NC催化剂具有多种HER电活性，在1 m KOH，0.5 m KOH中具有非常低的75、60和123 mV超电势H 2 SO 4和1 m PBS电解质分别为HER提供10 mA cm -2的电流密度。混合电催化剂如此出色的HER性能主要归因于电子结构工程的集体效应，异质结中CoP和NiCoP之间的强界面耦合，由于2D形态导致的表面积增加/暴露的催化活性位以及导电NC支撑。相信该方法为开发具有各种电化学应用的有效二维电极材料提供了基础。
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