The hydrogen evolution reaction (HER) catalysts with high activity and stability in acid electrolyte are widely reported. However, the abundant, active and acidic stable catalysts for the oxygen evolution reaction (OER) are scarce to build the two-electrodes for water splitting. Fe-based materials are promising candidate electrocatalysts for OER in alkaline electrolyte, but unstable in acid electrolyte. Herein, some amount of iron oxides are incorporated into titanium dioxide nanowires (Fe-TiO_x LNWs/Ti) by ion substitution and followed calcination process. The obtained Fe-TiO_x LNWs/Ti lead to a moderate improved stability (81.3% vs. 33.3% for Fe₂O₃ loaded on Ti foam at the same potential of 1.9 V vs. SCE for 20 h), and remain high activity for OER (a low onset potential of 1.49 V vs. RHE at 1 mA cm⁻²) in acid electrolyte. This study opens up the possibility and universality of active and abundant nonprecious metal oxides for OER utilized in acid electrolytes.

广泛报道了在酸性电解质中具有高活性和稳定性的析氢反应（HER）催化剂。然而，用于氧析出反应（OER）的丰富，活性和酸性稳定的催化剂不足以构建用于水分解的两电极。铁基材料是有希望在碱性电解质中用作OER的候选电催化剂，但在酸性电解质中则不稳定。本文中，通过离子取代并随后煅烧工艺将一些氧化铁掺入二氧化钛纳米线（Fe-TiO _x LNWs / Ti）中。所获得的Fe-TiO _x LNWs / Ti导致适度提高的稳定性（Fe ₂ O ₃为81.3％，而Fe ₂ O ₃为33.3％以1.9 V vs. SCE的相同电位在Ti泡沫上负载20小时），并在酸性电解质中对OER保持高活性（在1 mA cm ^-2时，OER的低起始电位为1.49 V vs. RHE ）。这项研究为酸性电解质中用于OER的活性和丰富的非贵金属氧化物的可能性和普遍性开辟了道路。