Liu Haoxuan, Peng Xianyun, Liu Xijun, Qi Gaocan, Luo Jun
Center for Electron Microscopy, Tianjin Key Lab of Advanced Functional Porous Materials, Institute for New Energy Materials and Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China.
School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China.
ChemSusChem. 2019 Apr 5;12(7):1334-1341. doi: 10.1002/cssc.201802437. Epub 2019 Feb 14.
Development of highly active and stable electrocatalysts for overall water splitting is important for future renewable energy systems. In this study, porous Mn-doped FeP/Co (PO ) (PMFCP) nanosheets on carbon cloth are utilized as a highly efficient 3 D self-supported binder-free integrated electrode for the oxygen evolution and hydrogen evolution reactions (OER and HER) over a wide pH range. Specifically, overpotentials of 27, 117, 85 mV are required for the PMFCP nanosheets to attain 10 mA cm for HER in 0.5 m H SO , 1.0 m phosphatebuffered saline (PBS), and 1.0 m KOH, respectively. In addition to the excellent performance for HER electrocatalysis, PMFCP nanosheets were also efficient electrocatalysts for the OER. Thus, the PMFCP nanosheets can serve as anodes and cathodes for overall water splitting (OWS). The OWS working voltages to attain 10 mA cm are found to be 1.75, 1.82, and 1.61 V in acid, neutral, and alkaline electrolytes, respectively. Chronopotentiometric tests show that the PMFCP electrode can maintain its excellent pH-universal OWS activity for more than 30 000 s. This work also provides new insights into developing high-performance electrocatalysts for water splitting over a wide pH range. The improvement in electrochemical performance by introduction of Mn dopant and nano-holes offers new opportunities in the development of effective electrodes for other energy-related applications.
开发用于全水分解的高活性和稳定的电催化剂对未来的可再生能源系统至关重要。在本研究中，碳布上的多孔锰掺杂FeP/Co(PO)（PMFCP）纳米片被用作一种高效的三维自支撑无粘结剂集成电极，用于在很宽的pH范围内进行析氧反应和析氢反应（OER和HER）。具体而言，在0.5 m H₂SO₄、1.0 m磷酸盐缓冲盐水（PBS）和1.0 m KOH中，PMFCP纳米片分别达到10 mA cm⁻²的HER过电位为27、117、85 mV。除了在HER电催化方面表现出色外，PMFCP纳米片也是OER的高效电催化剂。因此，PMFCP纳米片可作为全水分解（OWS）的阳极和阴极。在酸性、中性和碱性电解质中，达到10 mA cm⁻²的OWS工作电压分别为1.75、1.82和1.61 V。计时电位测试表明，PMFCP电极在超过30000 s的时间内能够保持其优异的pH通用OWS活性。这项工作还为开发在宽pH范围内用于水分解的高性能电催化剂提供了新的见解。通过引入锰掺杂剂和纳米孔来提高电化学性能，为开发用于其他能源相关应用的有效电极提供了新的机会。
