过电位
分解水
析氧
催化作用
材料科学
电解水
层状双氢氧化物
氢
电解
化学
吸附
无机化学
物理化学
电化学
电极
生物化学
有机化学
光催化
电解质
作者
Yihang Hu,Tianyang Shen,Ziheng Song,Zhaohui Wu,Sha Bai,Guihao Liu,Xiaoliang Sun,Yuying Wang,Siyu Hu,Lirong Zheng,Yu‐Fei Song
出处
期刊:ACS Catalysis
日期:2023-08-09
卷期号:13 (16): 11195-11203
被引量:15
标识
DOI:10.1021/acscatal.3c02628
摘要
Electrocatalytic overall water splitting is a promising approach for hydrogen production, and the rational design of the catalyst on the atomic level is critical for decreasing the energy barrier in both hydrogen and oxygen evolution reactions (HER/OER). Herein, we report an NiIr single atom alloy loaded NiFe-LDH (NiIrSAA-NiFe-LDH) and Ir single atom loaded NiFe-LDH (IrSAC-NiFe-LDH) for overall water splitting. The Ir single atoms are found via EXAFS fitting and DFT calculations to be located on the top of Fe3+ with Ir–O6 coordination on IrSAC-NiFe-LDH. The as-prepared NiIrSAA-NiFe-LDH presents an overpotential of 28.5 mV at 10 mA cm–2 in the HER and IrSAC-NiFe-LDH exhibits an overpotential of 194 mV at 10 mA cm–2 in the OER, respectively. Moreover, the electrolyzer assembled by NiIrSAA-NiFe-LDH and IrSAC-NiFe-LDH presents a low cell voltage of 1.49 V at 10 mA cm–2 and a long-term stability of over 120 h at 200 mA cm–2 in overall water splitting with an estimated cost of US $1.12 per kilogram of H2, meeting the target raised by the US Department of Energy (
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