过电位
材料科学
分解水
电解质
催化作用
肖特基势垒
电极
肖特基二极管
化学工程
光电子学
化学
电化学
物理化学
光催化
二极管
工程类
生物化学
作者
Selvaraj Seenivasan,Hyeonae Im,Taewaen Lim,Jeong Woo Han,Junhyeok Seo
标识
DOI:10.1016/j.apcatb.2023.123233
摘要
In water splitting reactions, (oxy)hydroxide catalysts generated in situ have been commonly suggested as real-time active species; however, their poor electrical conductance severely restricts catalytic reactivity. We here demonstrate that a classical unipolar Schottky junction electrode can nullify non-conductive lamination of poor-conductive catalysts; we use a water splitting reaction in our model study. Nickel-tungsten nitride (Ni-W5N4) alloy catalyzed HER, recording 10 mA/cm2 at overpotential of 11 mV (without iR compensation). The Ni-W5N4|NiFeOOH forms a rectifying Schottky junction to accelerate electron-flow across the junction; this results in excellent OER activity. The forward biased Ni-W5N4|NiFeOOH Schottky junction yielded 10 mA/cm2 at overpotential of 181 mV (without iR compensation). The remarkable catalytic activity is attributed to the fundamental Schottky junction rather than to electrode|electrolyte interface. Moreover, demonstration of overall seawater splitting using a full cell setup showed high current density of 100 mA/cm2 at only 230 mV overpotential with outstanding durability.
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