A comprehensive understanding of the role of the electrocatalyst in photoelectrochemical(PEC)water splitting is central to improving its performance.Herein,taking the Si-based photoanodes(n^(+)p-Si/SiO_(x)/Fe/FeOx/MOO...A comprehensive understanding of the role of the electrocatalyst in photoelectrochemical(PEC)water splitting is central to improving its performance.Herein,taking the Si-based photoanodes(n^(+)p-Si/SiO_(x)/Fe/FeOx/MOOH,M=Fe,Co,Ni)as a model system,we investigate the effect of the transition-metal electrocatalysts on the oxygen evolution reaction(OER).Among the photoanodes with the three different electrocatalysts,the best OER activity,with a low-onset potential of∼1.01 VRHE,a high photocurrent density of 24.10 mA cm^(-2)at 1.23 VRHE,and a remarkable saturation photocurrent density of 38.82 mA cm^(-2),was obtained with the NiOOH overlayer under AM 1.5G simulated sunlight(100 mW cm^(-2))in 1 M KOH electrolyte.The optimal interfacial engineering for electrocatalysts plays a key role for achieving high performance because it promotes interfacial charge transport,provides a larger number of surface active sites,and results in higher OER activity,compared to other electrocatalysts.This study provides insights into how electrocatalysts function in water-splitting devices to guide future studies of solar energy conversion.展开更多
The rapid consumption of fossil fuels has caused increasingly climatic issues and energy crisis,which leads to the urgent demand for developing sustainable and clean energies.Electrocatalysts play a key role in the de...The rapid consumption of fossil fuels has caused increasingly climatic issues and energy crisis,which leads to the urgent demand for developing sustainable and clean energies.Electrocatalysts play a key role in the development of electrochemical energy conversion and storage devices.Especially,developing efficient and cost-effective catalysts is important for the large-scale application of these devices.Among various electrocatalyst candidates,earth abundant transition metal compound(TMC)-based electrocatalysts are being widely and rapidly studied owing to their high electrocatalytic performances.This paper reviews the recent and representative advances in efficient TMC-based electrocatalysts(i.e.,oxides,sulfides,selenides,phosphides,carbides and nitrides)for energy electrocatalytic reactions,including hydrogen evolution reaction(HER),oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Different compounds with different applications are summarized and the relative mechanisms are also discussed.The strategies for developing earth-abundant and low-cost TMC-based electrocatalysts are introduced.In the end,the current challenges and future perspectives in the development of TMC research are briefly discussed.This review also provides the latest advance and outlines the frontiers in TMC-based electrocatalysts,which should provide inspirations for the further development of low-cost and high-efficiency catalysts for sustainable clean energy technologies.展开更多
文摘A comprehensive understanding of the role of the electrocatalyst in photoelectrochemical(PEC)water splitting is central to improving its performance.Herein,taking the Si-based photoanodes(n^(+)p-Si/SiO_(x)/Fe/FeOx/MOOH,M=Fe,Co,Ni)as a model system,we investigate the effect of the transition-metal electrocatalysts on the oxygen evolution reaction(OER).Among the photoanodes with the three different electrocatalysts,the best OER activity,with a low-onset potential of∼1.01 VRHE,a high photocurrent density of 24.10 mA cm^(-2)at 1.23 VRHE,and a remarkable saturation photocurrent density of 38.82 mA cm^(-2),was obtained with the NiOOH overlayer under AM 1.5G simulated sunlight(100 mW cm^(-2))in 1 M KOH electrolyte.The optimal interfacial engineering for electrocatalysts plays a key role for achieving high performance because it promotes interfacial charge transport,provides a larger number of surface active sites,and results in higher OER activity,compared to other electrocatalysts.This study provides insights into how electrocatalysts function in water-splitting devices to guide future studies of solar energy conversion.
基金supported by the National Natural Science Foundation of China(51804216 and 51972224)the Young Elite Scientists Sponsorship Program by CAST(2018QNRC001)+1 种基金Tianjin Natural Science Foundation(17JCQNJC02100)support from China Postdoctoral Science Foundation(2019M661014)。
文摘The rapid consumption of fossil fuels has caused increasingly climatic issues and energy crisis,which leads to the urgent demand for developing sustainable and clean energies.Electrocatalysts play a key role in the development of electrochemical energy conversion and storage devices.Especially,developing efficient and cost-effective catalysts is important for the large-scale application of these devices.Among various electrocatalyst candidates,earth abundant transition metal compound(TMC)-based electrocatalysts are being widely and rapidly studied owing to their high electrocatalytic performances.This paper reviews the recent and representative advances in efficient TMC-based electrocatalysts(i.e.,oxides,sulfides,selenides,phosphides,carbides and nitrides)for energy electrocatalytic reactions,including hydrogen evolution reaction(HER),oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Different compounds with different applications are summarized and the relative mechanisms are also discussed.The strategies for developing earth-abundant and low-cost TMC-based electrocatalysts are introduced.In the end,the current challenges and future perspectives in the development of TMC research are briefly discussed.This review also provides the latest advance and outlines the frontiers in TMC-based electrocatalysts,which should provide inspirations for the further development of low-cost and high-efficiency catalysts for sustainable clean energy technologies.
