Partially reduced Ni2+, Fe3+-layered double hydroxide for ethanol electrocatalysis
- 195 Downloads
Direct alcohol fuel cells can directly convert the chemical energy stored in small liquid alcohol molecules into electricity. The non-noble metal oxides and oxyhydroxides have poor electric conductivity, limiting their electrochemical performance. Herein, Ni3Fe/NiFe(OH)x heterostructure with Ni3Fe alloy nanoparticles confined in amorphous NiFe(OH)x matrix is facilely fabricated by partial reduction of Ni2+, Fe3+-layered double hydroxide (NiFe-LDH) precursor in flowing hydrogen. Small Ni3Fe particles with about 4 nm diameter are clearly recognized after reduction at 250 °C. Further raising the reduction temperature to 350 °C results in a greater degree of segregation of Ni3Fe each other. Moreover, the 350 °C reduction causes the formation of NiFeOx, accompanied by vanishment of the NiFe(OH)x. Ethanol electrooxidation is carried out for evaluating the electrocatalytic performance of these samples. The electrocatalytic activity of NiFe-LDH precursor is enhanced by controlling H2 reduction at 250 °C. The high electrical conductivity, created by Ni3Fe metal alloy, is proposed to result in the high electrocatalytic activity of the Ni3Fe/Ni3Fe(OH)x heterostructure.
This work was supported by National Natural Science Foundation of China (Nos. 21376019, 21676013) and Beijing Engineering Center for Hierarchical Catalysts.
Compliance with ethical standards
Conflict of interest
All authors declare that they have no conflict of interest.
- 16.Friebel D, Louie MW, Bajdich M, Sanwald KE, Cai Y, Wise AM, Cheng MJ, Sokaras D, Weng TC, Mori RA, Davis RC, Bargar JR, Nørskov JK, Nilsson A, Bell AT (2015) Identification of highly active Fe sites in (Ni, Fe) OOH for electrocatalytic water splitting. J Am Chem Soc 137:1305–1313CrossRefGoogle Scholar
- 30.Fu GR, Hu ZA, Xie LJ, Jin XQ, Xie YL, Wang YX, Zhang ZY, Yang YY, Wu HY (2009) Electrodeposition of nickel hydroxide films on nickel foil and its electrochemical performances for supercapacitor. Int J Electrochem Sci 4:1052–1062Google Scholar