请问泡沫镍/碳布是在如何计算电化学暴露面积的（单面还是双面）？（审稿人为难我了）？

如题：泡沫镍/碳布是在如何计算电化学暴露面积的（单面还是双面）？
1）When presenting the current density, how the exposed area is defined? Does one side or both sides of nickel foam counted?
2）How did the author calculate the geometric normalized current? Does the two sides of the Ni foam electrode are both considered?
两个审稿人都提到这个问题，我问了周围的同事，也难倒了，请求帮忙，感谢！