Ammonia electro-oxidation activity is promoted at Pt nanostructured catalysts which combine high surface area values and a high proportion of (1 0 0) surface atoms. The latter is extensively known to be the most active surface arrangement of atoms for NH₃ oxidation. In the present study, Pt(1 0 0) nanostructured thin films were prepared and subsequently modified by surface functionalization with rhodium through pulsed electrodeposition. Rh surface coverage was varied by modifying the number of applied electrodeposition pulses, and was found to modify the voltammetric H_upd features. When Rh surface content was assessed by H_upd deconvolution analyses, it was revealed that Rh nucleation first occurred at (1 0 0) Pt step sites in the form of Rh(1 0 0) sub-monolayers, and subsequently grew further to form Rh multilayer species. For minute amounts of rhodium, NH₃ activity is increased slightly, provided that long range (1 0 0) Pt wide domains were not shortened. The lower onset potential for NH₃ oxidation in the presence of Rh surface atoms, which is shifted negatively by more than 50 mV as compared to Pt, is attributed to the NH₃ oxidative dehydrogenation processes at lower potential values. For similar Rh coverage (around 20%), similar NH₃ activity is obtained at pseudomorphic Rh(1 0 0) adlayers and Rh 3D islands, a finding which emphasizes the non-specific NH₃ activity of Rh(1 0 0) atoms.

在结合了高表面积值和高比例的（1 0 0）表面原子的Pt纳米结构催化剂上，氨的电氧化活性得到提高。众所周知，后者是用于NH ₃氧化的最活跃的原子表面排列。在本研究中，制备了Pt（1 0 0）纳米结构薄膜，随后通过脉冲电沉积用铑对表面进行了功能化改性。Rh表面覆盖率通过改变施加的电沉积脉冲的数量而变化，并且发现其改变了伏安法H _upd特征。用R _upd评估Rh表面含量反褶积分析表明，Rh成核首先以Rh（1 0 0）亚单层的形式出现在（1 0 0）Pt台阶部位，然后进一步生长以形成Rh多层物质。对于少量的铑，只要不缩短长距离（1 0 0）Pt宽域，NH ₃活性就会略有增加。在存在Rh表面原子的情况下，NH ₃氧化的起始电位较低，与Pt相比负迁移超过50 mV，这归因于在较低电位值下的NH ₃氧化脱氢过程。对于类似的Rh覆盖率（大约20％），类似的NH ₃活性在拟态Rh（1 0 0）附加层和Rh 3D岛上获得，这一发现强调了Rh（1 0 0）原子的非特异性NH ₃活性。