Basumatary Padmini, Choi Ji-Hyeok, Konwar Dimpul, Ramchiary Anjalu, Han Byungchan, Yoon Young Soo
Department of Materials Science and Engineering, Gachon University, Bokjung-dong, Seongnam-si, Gyeonggi-Do, 1342, Republic of Korea.
Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Small Methods. 2024 Oct;8(10):e2301651. doi: 10.1002/smtd.202301651. Epub 2024 Mar 10.
The higher amount of Pt usage and its poisoning in methanol oxidation reaction in acidic media is a major setback for methanol fuel cells. Herein, a promising dual application high-performance electrocatalyst has been developed for hydrogen evolution and methanol oxidation. A low Pt-content nanoalloy co-doped with Cu, Mn, and P is synthesized using a modified solvothermal process. Initially, ultrasmall ≈2.9 nm PtCuMnP nanoalloy is prepared on N-doped graphene-oxide support and subsequently, it is characterized using several analytical techniques and examined through electrochemical tests. Electrochemical results show that PtCuMnP/N-rGO has a low overpotential of 6.5 mV at 10 mA cm in 0.3 m HSO and high mass activity for the hydrogen evolution reaction. For the methanol oxidation reaction, the PtCuMnP/N-rGO electrocatalyst exhibits robust performance. The mass activity of PtCuMnP/N-rGO is 6.790 mA mg , which is 7.43 times higher than that of commercial Pt/C (20% Pt). Moreover, in the chronoamperometry test, PtCuMnP/N-rGO shows exceptionally good stability and retains 72% of the initial current density even after 20,000 cycles. Furthermore, the PtCuMnP/N-rGO electrocatalyst exhibits outstanding performance for hydrogen evolution and methanol oxidation along with excellent anti-poisoning ability. Hence, the developed bifunctional electrocatalyst can be used efficiently for hydrogen evolution and methanol oxidation.
在酸性介质中甲醇氧化反应中较高的铂用量及其中毒现象是甲醇燃料电池的一个主要挫折。在此，已开发出一种有前景的用于析氢和甲醇氧化的双功能高性能电催化剂。使用改进的溶剂热法合成了一种共掺杂铜、锰和磷的低铂含量纳米合金。首先，在氮掺杂氧化石墨烯载体上制备了超小的≈2.9纳米铂铜锰磷纳米合金，随后，使用多种分析技术对其进行表征，并通过电化学测试对其进行检验。电化学结果表明，铂铜锰磷/氮掺杂还原氧化石墨烯在0.3 m硫酸中10 mA cm时的过电位低至6.5 mV，对析氢反应具有高的质量活性。对于甲醇氧化反应，铂铜锰磷/氮掺杂还原氧化石墨烯电催化剂表现出稳健的性能。铂铜锰磷/氮掺杂还原氧化石墨烯的质量活性为6.790 mA mg，比商业铂碳（20%铂）高7.43倍。此外，在计时电流法测试中，铂铜锰磷/氮掺杂还原氧化石墨烯表现出异常良好的稳定性，即使在20000次循环后仍保留72%的初始电流密度。此外，铂铜锰磷/氮掺杂还原氧化石墨烯电催化剂在析氢和甲醇氧化方面表现出优异的性能以及出色的抗中毒能力。因此，所开发的双功能电催化剂可有效地用于析氢和甲醇氧化。
