Partially reduced Ni2+, Fe3+-layered double hydroxide for ethanol electrocatalysis
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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.
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Conflict of interest
All authors declare that they have no conflict of interest.
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