A 4 × 4 cm² Nanoengineered Solid Oxide Electrolysis Cell for Efficient and Durable Hydrogen Production

Abstract

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An Up-scalable, Infiltration-Based Approach for Improving the Durability of Ni/YSZ Electrodes for Solid Oxide Cells

“…The reasons for the improved durability on the CGO modified Ni/YSZ electrode here should be similar to the findings in our previous work (where the CGO was introduced into the Ni/YSZ electrode after the "two-atmosphere-reduction"), i.e., mitigating microstructural deterioration including Ni migration and disconnection between Ni and YSZ at the TPBs seen on nonmodified Ni/YSZ electrodes. 12,23 After steam electrolysis, the infiltrated cell was further investigated for reversible operation under a current density of first +/−0.50 and then +/−1.00 A cm −2 at 750 °C (Fig. 9a).…”

Long term durability test and post mortem for metal-supported solid oxide electrolysis cells

“…[9] Tong et al reported a degradation rate of 0.024 V kh -1 in a 900 h test at 1 A cm -2 3 with nano-engineered electrodes, which was reported to be superior to the degradation rate of most previously studied SOECs. [10] Extensive studies have been devoted to the degradation modes of all-ceramic SOECs. Electrolyte reduction, [11,12] delamination, [13,14] intergranular fracture and void formation along the grain boundaries of the electrolyte, [15] structure damage in thick yttria-stabilized zirconia (YSZ) electrolyte, [16] and formation of an insulating layer between the buffer layer and the electrolyte [17] all have been reported to degrade the electrolyte.…”

Promotion of oxygen reduction and evolution by applying a nanoengineered hybrid catalyst on cobalt free electrodes for solid oxide cells

“…The modification of Ni/YSZ fuel electrode with CGO electrocatalysts was performed by a prereduction procedure followed by the infiltration of Ce0.8Gd0.2O2-δ (CGO20) nitrate precursor solution containing stoichiometric amounts of Ce(NO3)3 and Gd(NO3)3 (4:1 molar ratio to metal ions), as previously reported. 29 The infiltration processes were repeated 7 times to get a loading of ∼110 mg CGO20 per 1 cm 3 Ni/YSZ structure (Ni/YSZ fuel electrode + Ni/YSZ support).…”

“…53 Recently, encouraging progress has been made in understanding the degradation mechanism and in strategies to reduce degradation. 29,45,46,54,55 We have found that surface modification of the Ni/YSZ electrode by coating nano-sized Ce0.8Gd0.2O2-δ (CGO20) electrocatalysts is an effective approach to enhance the cell durability. 29,45,56 Here, we applied this approach to the hybrid-catalyst-coated LSF cell thus resulting in a double-side modified cell (with a CGO20coated Ni/YSZ fuel electrode and the hybrid-catalyst-coated LSF oxygen electrode).…”