Abstract
SPE water electrolysis is a promising method of hydrogen production owing to its multiple strengths, including its high efficiency, high product purity and excellent adaptability. However, the overpotential of the oxygen evolution reaction process and consumption of Ir during charging in SPE water electrolysis will inevitably result in large energy loss and then high cost. Under these circumstances, we propose a novel 40IrO2/CoxSn(1−x)O2 (x = 0.1, 0.2, 0.3) anode catalyst, where the CoxSn(1−x)O2 support is synthesized by a hydrothermal method and IrO2 is synthesized by a modified Adams fusion method. After modifying the component of CoxSn(1−x)O2, the 40IrO2/CoxSn(1−x)O2 exhibits an increased specific surface area, electrical conductivity and surface active sites. Moreover, a single cell is fabricated by Pt/C as cathode catalyst, 40IrO2/CoxSn(1−x)O2 as anode catalyst and Nafion 117 membrane as electrolyte. The 40IrO2/Co0.2Sn0.8O2 exhibits the lowest overpotential (1.748 V at 1000 mA cm−2), and only 0.18 mV h−1 of voltage increased for 100 h durability test at 1000 mA cm−2. Consequently, CoxSn(1−x)O2 is a promising anode electrocatalyst support for an SPE water electrolyzer.
Highlights
Hydrogen is regarded as one of the promising solutions for developing clean energy and solving the thorny environmental problems present on the Earth [1]
It is noted that the diffraction peaks of SnO2 doped with varying Co content show similar shapes to the pure SnO2, and no second phase about Co is detected, which confirms that Co ions were successfully doped into SnO2 [33]
After the membrane electrode assemblies (MEAs) assembled in single cells, the oxygen evolution reaction (OER) performance of the 40IrO2/CoxSn12xO2 catalysts was further characterized by I-V polarization measurement from 0.01 to 1 A cm22 at 808C, as displayed in figure 7
Summary
Hydrogen is regarded as one of the promising solutions for developing clean energy and solving the thorny environmental problems present on the Earth [1]. Some highly active and stable noble metal-based catalysts have been developed, such as RuO2 and IrO2 for OER, these materials are still far from large-scale application because of their high cost and scarcity. Multiple studies have been devoted to develop novel, highly efficient and low-cost catalysts (e.g. La2NiMnO6 [14], Ni-Fe-layered double hydroxide [15] and Ternary Ni–Co–Fe blue analogue [16]) These new catalysts too have drawbacks, such as a complicated preparation process and poor durability. Tin oxide (SnO2), as a corrosion-resistant support, has been reported to promote the dispersion of noble metal-based materials and provide more surface active sites of catalysts [26]. The prepared samples with Co doping show low overpotential (1.748 V at 1000 mA cm22) and excellent stability
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