Maximally exploiting the active sites of iridium catalysts is essential for building low-cost proton exchange membrane(PEM)electrolyzers for green H_(2)production.Herein,we report a novel microdrop-confined fusion/bla...Maximally exploiting the active sites of iridium catalysts is essential for building low-cost proton exchange membrane(PEM)electrolyzers for green H_(2)production.Herein,we report a novel microdrop-confined fusion/blasting(MCFB)strategy for fabricating porous hollow IrO_(1-x)microspheres(IrO_(1-x)-PHM)by introducing explosive gas mediators from a NaNO_(3)/glucose mixture.Moreover,the developed MCFB strategy is demonstrated to be general for synthesizing a series of Ir-based composites,including Ir-Cu,Ir-Ru,Ir-Pt,Ir-Rh,Ir-Pd,and Ir-Cu-Pd and other noble metals such as Rh,Ru,and Pt.The hollow structures can be regulated using different organics with NaNO_(3).The assembled PEM electrolyzer with IrO_(1-x)-PHM as the anode catalyst(0.5 mg/cm^(2))displays an impressive polarization voltage of 1.593and 1.726 V at current densities of 1 and 2 A/cm^(2),respectively,outperforming commercial IrO_(x)catalysts and most of the ever-reported iridium catalysts with such low catalyst loading.More importantly,the breakdown of the polarization loss indicates that the improved performance is due to the facilitated mass transport induced by the hollowness.This study offers a versatile platform for fabricating efficient Irbased catalysts for PEM electrolyzers and beyond.展开更多
基金supported by the National Natural Science Foundation of China(22375004,22175163,and 21801003)Anhui Provincial Education Department(2023AH020014,2023AH010030,gxgnfx2021132)+5 种基金the University Synergy Innovation Program of Anhui Province(GXXT-2022-007)Science and Technology Program of Wuhu(2022yf60)the Natural Science Foundation of Anhui Province(2208085UD04)the Plan for Anhui Major Provincial Science&Technology Project(2021d05050006 and 202103a05020015)the Anhui Development and Reform Commission(AHZDCYCX-LSDT2023-07 and AHZDCYCX-LSDT2023-08)Anhui Polytechnic University(Youth Talent Training Program(2021))。
文摘Maximally exploiting the active sites of iridium catalysts is essential for building low-cost proton exchange membrane(PEM)electrolyzers for green H_(2)production.Herein,we report a novel microdrop-confined fusion/blasting(MCFB)strategy for fabricating porous hollow IrO_(1-x)microspheres(IrO_(1-x)-PHM)by introducing explosive gas mediators from a NaNO_(3)/glucose mixture.Moreover,the developed MCFB strategy is demonstrated to be general for synthesizing a series of Ir-based composites,including Ir-Cu,Ir-Ru,Ir-Pt,Ir-Rh,Ir-Pd,and Ir-Cu-Pd and other noble metals such as Rh,Ru,and Pt.The hollow structures can be regulated using different organics with NaNO_(3).The assembled PEM electrolyzer with IrO_(1-x)-PHM as the anode catalyst(0.5 mg/cm^(2))displays an impressive polarization voltage of 1.593and 1.726 V at current densities of 1 and 2 A/cm^(2),respectively,outperforming commercial IrO_(x)catalysts and most of the ever-reported iridium catalysts with such low catalyst loading.More importantly,the breakdown of the polarization loss indicates that the improved performance is due to the facilitated mass transport induced by the hollowness.This study offers a versatile platform for fabricating efficient Irbased catalysts for PEM electrolyzers and beyond.
基金supported by the National Key R&D Program of China (2018YFA0702003)the National Natural Science Foundation of China (21890383,21671117,21871159 and 21901135)+1 种基金the National Postdoctoral Program for Innovative Talents (BX20180160)the China Postdoctoral Science Foundation (2018M640113)。
基金the National Natural Science Foundation of China(51902003 and 21771003)Anhui Province Natural Science Foundation(2008085QB53)the Natural Science Research Project of Anhui Province Education Department(KJ2019A0581)。
文摘发展廉价、高效的水氧化(OER)催化剂对发展可持续能源具有重要意义.杂原子掺杂调节活性位点的电子结构提高催化剂的OER性能被认为是一种高效的策略.本文通过水热法制备得到Mn掺杂的层状镍铁氢氧化物/还原氧化石墨烯(Mn-NiFe LDH/rGO)作为高效、稳定的水氧化催化剂.实验和模拟计算研究都表明Mn能调整活性位点的电子结构,改善其对水氧化反应中中间产物的吸附能垒,从而减小OER反应中决速步骤的反应势垒.具体而言,最优的Mn-NiFe LDH/rGO复合材料在过电位仅为240 mV就能驱动10 mA cm^(-2)的电流密度,Tafel斜率低至40.0 mV dec^(-1),并且具有良好的稳定性.该催化剂优异的活性优于最近报道的OER电催化剂.本工作为制备用于能源转换领域的高活性、廉价的电催化剂提供了新的思路.
