(a) OER and (b) HER LSV curves of (NiFe)2P-PA/NF-0.00, (NiFe)2P-PA/NF-0.04, (NiFe)2P-PA/NF-0.12, (NiFe)2P-PA/NF-0.20, (NiFe)2P-PA/NF-0.24 and (NiFe)2P-PA/NF-0.28 materials. (c) OER and (d) HER LSV curves of (NiFeCo)2P-PA/NF-0.00, (NiFeCo)2P-PA/NF-0.02 and (NiFeCo)2P-PA/NF-0.04 materials.